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Edwin Eefting 2020-02-19 23:59:00 +01:00
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@ -287,15 +628,15 @@ free software which everyone can redistribute and change under these terms.
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@ -303,38 +644,31 @@ the "copyright" line and a pointer to where the full notice is found.
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353
README.md
View File

@ -1,23 +1,38 @@
# ZFS autobackup # ZFS autobackup
(checkout v3.0-beta for the new cool stuff: https://github.com/psy0rz/zfs_autobackup/blob/v3/README.md) ## New in v3
Official releases: https://github.com/psy0rz/zfs_autobackup/releases * Complete rewrite, cleaner object oriented code.
* Python 3 and 2 support.
* Installable via pip.
* Backwards compatible with your current backups and parameters.
* Progressive thinning (via a destroy schedule. default schedule should be fine for most people)
* Cleaner output, with optional color support (pip install colorama).
* Clear distinction between local and remote output.
* Summary at the beginning, displaying what will happen and the current thinning-schedule.
* More effient destroying/skipping snaphots on the fly. (no more space issues if your backup is way behind)
* Progress indicator (--progress)
* Better property management (--set-properties and --filter-properties)
* Better resume handling, automaticly abort invalid resumes.
* More robust error handling.
* Prepared for future enhanchements.
* Supports raw backups for encryption.
Introduction ## Introduction
============
ZFS autobackup is used to periodicly backup ZFS filesystems to other locations. This is done using the very effcient zfs send and receive commands. ZFS autobackup is used to periodicly backup ZFS filesystems to other locations. This is done using the very effcient zfs send and receive commands.
It has the following features: It has the following features:
* Works across operating systems: Tested with Linux, FreeBSD/FreeNAS and SmartOS. * Works across operating systems: Tested with Linux, FreeBSD/FreeNAS and SmartOS.
* Works in combination with existing replication systems. (Like Proxmox HA) * Works in combination with existing replication systems. (Like Proxmox HA)
* Automatically selects filesystems to backup by looking at a simple ZFS property. (recursive) * Automatically selects filesystems to backup by looking at a simple ZFS property. (recursive)
* Creates consistent snapshots. (takes all snapshots at once, atomic.) * Creates consistent snapshots. (takes all snapshots at once, atomic.)
* Multiple backups modes: * Multiple backups modes:
* Backup local data on the same server.
* "push" local data to a backup-server via SSH. * "push" local data to a backup-server via SSH.
* "pull" remote data from a server via SSH and backup it locally. * "pull" remote data from a server via SSH and backup it locally.
* Backup local data on the same server. * Or even pull data from a server while pushing the backup to another server.
* Can be scheduled via a simple cronjob or run directly from commandline. * Can be scheduled via a simple cronjob or run directly from commandline.
* Supports resuming of interrupted transfers. (via the zfs extensible_dataset feature) * Supports resuming of interrupted transfers. (via the zfs extensible_dataset feature)
* Backups and snapshots can be named to prevent conflicts. (multiple backups from and to the same filesystems are no problem) * Backups and snapshots can be named to prevent conflicts. (multiple backups from and to the same filesystems are no problem)
@ -28,57 +43,72 @@ It has the following features:
* Keeps latest X snapshots remote and locally. (default 30, configurable) * Keeps latest X snapshots remote and locally. (default 30, configurable)
* Uses zfs-holds on important snapshots so they cant be accidentally destroyed. * Uses zfs-holds on important snapshots so they cant be accidentally destroyed.
* Easy installation: * Easy installation:
* Only one host needs the zfs_autobackup script. The other host just needs ssh and the zfs command. * Just install zfs-autobackup via pip, or download it manually.
* Written in python and uses zfs-commands, no 3rd party dependency's or libraries. * Written in python and uses zfs-commands, no 3rd party dependency's or libraries.
* No separate config files or properties. Just one command you can copy/paste in your backup script. * No separate config files or properties. Just one zfs-autobackup command you can copy/paste in your backup script.
Usage ## Installation
====
Use pip to install:
```console
[root@server ~]# pip install zfs-autobackup
``` ```
usage: zfs_autobackup [-h] [--ssh-source SSH_SOURCE] [--ssh-target SSH_TARGET]
On older servers you might have to use easy_install
```console
[root@server ~]# easy_install zfs-autobackup
```
Its also possible to just download <https://raw.githubusercontent.com/psy0rz/zfs_autobackup/v3/bin/zfs_autobackup> and run it directly.
## Usage
```console
[root@server ~]# zfs-autobackup --help
usage: zfs-autobackup [-h] [--ssh-source SSH_SOURCE] [--ssh-target SSH_TARGET]
[--keep-source KEEP_SOURCE] [--keep-target KEEP_TARGET] [--keep-source KEEP_SOURCE] [--keep-target KEEP_TARGET]
[--no-snapshot] [--no-send] [--allow-empty] [--no-snapshot] [--allow-empty] [--ignore-replicated]
[--ignore-replicated] [--no-holds] [--ignore-new] [--no-holds] [--resume] [--strip-path STRIP_PATH]
[--resume] [--strip-path STRIP_PATH] [--buffer BUFFER] [--buffer BUFFER] [--clear-refreservation]
[--clear-refreservation] [--clear-mountpoint] [--clear-mountpoint]
[--filter-properties FILTER_PROPERTIES] [--rollback] [--filter-properties FILTER_PROPERTIES]
[--ignore-transfer-errors] [--test] [--verbose] [--set-properties SET_PROPERTIES] [--rollback]
[--debug] [--ignore-transfer-errors] [--raw] [--test] [--verbose]
[--debug] [--debug-output] [--progress]
backup_name target_path backup_name target_path
ZFS autobackup v2.4 ZFS autobackup 3.0-beta6
positional arguments: positional arguments:
backup_name Name of the backup (you should set the zfs property backup_name Name of the backup (you should set the zfs property
"autobackup:backup-name" to true on filesystems you "autobackup:backup-name" to true on filesystems you
want to backup want to backup
target_path Target path target_path Target ZFS filesystem
optional arguments: optional arguments:
-h, --help show this help message and exit -h, --help show this help message and exit
--ssh-source SSH_SOURCE --ssh-source SSH_SOURCE
Source host to get backup from. (user@hostname) Source host to get backup from. (user@hostname)
Default local. Default None.
--ssh-target SSH_TARGET --ssh-target SSH_TARGET
Target host to push backup to. (user@hostname) Default Target host to push backup to. (user@hostname) Default
local. None.
--keep-source KEEP_SOURCE --keep-source KEEP_SOURCE
Number of days to keep old snapshots on source. Thinning schedule for old source snapshots. Default:
Default 30. 10,1d1w,1w1m,1m1y
--keep-target KEEP_TARGET --keep-target KEEP_TARGET
Number of days to keep old snapshots on target. Thinning schedule for old target snapshots. Default:
Default 30. 10,1d1w,1w1m,1m1y
--no-snapshot dont create new snapshot (usefull for finishing --no-snapshot dont create new snapshot (usefull for finishing
uncompleted backups, or cleanups) uncompleted backups, or cleanups)
--no-send dont send snapshots (usefull to only do a cleanup)
--allow-empty if nothing has changed, still create empty snapshots. --allow-empty if nothing has changed, still create empty snapshots.
--ignore-replicated Ignore datasets that seem to be replicated some other --ignore-replicated Ignore datasets that seem to be replicated some other
way. (No changes since lastest snapshot. Usefull for way. (No changes since lastest snapshot. Usefull for
proxmox HA replication) proxmox HA replication)
--no-holds Dont lock snapshots on the source. (Usefull to allow --no-holds Dont lock snapshots on the source. (Usefull to allow
proxmox HA replication to switches nodes) proxmox HA replication to switches nodes)
--ignore-new Ignore filesystem if there are already newer snapshots
for it on the target (use with caution)
--resume support resuming of interrupted transfers by using the --resume support resuming of interrupted transfers by using the
zfs extensible_dataset feature (both zpools should zfs extensible_dataset feature (both zpools should
have it enabled) Disadvantage is that you need to use have it enabled) Disadvantage is that you need to use
@ -92,131 +122,192 @@ optional arguments:
transfer. (e.g. --buffer 1G) Will also show nice transfer. (e.g. --buffer 1G) Will also show nice
progress output. progress output.
--clear-refreservation --clear-refreservation
Set refreservation property to none for new Filter "refreservation" property. (recommended, safes
filesystems. Usefull when backupping SmartOS volumes. space. same as --filter-properties refreservation)
(recommended) --clear-mountpoint Filter "canmount" property. You still have to set
--clear-mountpoint Sets canmount=noauto property, to prevent the received canmount=noauto on the backup server. (recommended,
filesystem from mounting over existing filesystems. prevents mount conflicts. same as --filter-properties
(recommended) canmount)
--filter-properties FILTER_PROPERTIES --filter-properties FILTER_PROPERTIES
Filter properties when receiving filesystems. Can be List of propererties to "filter" when receiving
specified multiple times. (Example: If you send data filesystems. (you can still restore them with zfs
from Linux to FreeNAS, you should filter xattr) inherit -S)
--set-properties SET_PROPERTIES
List of propererties to override when receiving
filesystems. (you can still restore them with zfs
inherit -S)
--rollback Rollback changes on the target before starting a --rollback Rollback changes on the target before starting a
backup. (normally you can prevent changes by setting backup. (normally you can prevent changes by setting
the readonly property on the target_path to on) the readonly property on the target_path to on)
--ignore-transfer-errors --ignore-transfer-errors
Ignore transfer errors (still checks if received Ignore transfer errors (still checks if received
filesystem exists. usefull for acltype errors) filesystem exists. usefull for acltype errors)
--raw For encrypted datasets, send data exactly as it exists
on disk.
--test dont change anything, just show what would be done --test dont change anything, just show what would be done
(still does all read-only operations) (still does all read-only operations)
--verbose verbose output --verbose verbose output
--debug debug output (shows commands that are executed) --debug Show zfs commands that are executed, stops after an
exception.
--debug-output Show zfs commands and their output/exit codes. (noisy)
--progress show zfs progress output (to stderr)
When a filesystem fails, zfs_backup will continue and report the number of When a filesystem fails, zfs_backup will continue and report the number of
failures at that end. Also the exit code will indicate the number of failures. failures at that end. Also the exit code will indicate the number of failures.
``` ```
Backup example ## Backup example
==============
In this example we're going to backup a SmartOS machine called `smartos01` to our fileserver called `fs1`. In this example we're going to backup a machine called `pve` to our backupserver.
Its important to choose a unique and consistent backup name. In this case we name our backup: `smartos01_fs1`. Its important to choose a unique and consistent backup name. In this case we name our backup: `offsite1`.
Select filesystems to backup ### Select filesystems to backup
----------------------------
On the source zfs system set the ```autobackup:smartos01_fs1``` zfs property to true: On the source zfs system set the ```autobackup:offsite``` zfs property to true:
```
[root@smartos01 ~]# zfs set autobackup:smartos01_fs1=true zones ```console
[root@smartos01 ~]# zfs get -t filesystem autobackup:smartos01_fs1 [root@pve ~]# zfs set autobackup:offsite1=true rpool
NAME PROPERTY VALUE SOURCE [root@pve ~]# zfs get -t filesystem,volume autobackup:offsite1
zones autobackup:smartos01_fs1 true local NAME PROPERTY VALUE SOURCE
zones/1eb33958-72c1-11e4-af42-ff0790f603dd autobackup:smartos01_fs1 true inherited from zones rpool autobackup:offsite1 true local
zones/3c71a6cd-6857-407c-880c-09225ce4208e autobackup:smartos01_fs1 true inherited from zones rpool/ROOT autobackup:offsite1 true inherited from rpool
zones/3c905e49-81c0-4a5a-91c3-fc7996f97d47 autobackup:smartos01_fs1 true inherited from zones rpool/ROOT/pve-1 autobackup:offsite1 true inherited from rpool
rpool/data autobackup:offsite1 true inherited from rpool
rpool/data/vm-100-disk-0 autobackup:offsite1 true inherited from rpool
rpool/swap autobackup:offsite1 true inherited from rpool
... ...
``` ```
Because we dont want to backup everything, we can exclude certain filesystem by setting the property to false: Because we dont want to backup everything, we can exclude certain filesystem by setting the property to false:
```
[root@smartos01 ~]# zfs set autobackup:smartos01_fs1=false zones/backup ```console
[root@smartos01 ~]# zfs get -t filesystem autobackup:smartos01_fs1 [root@pve ~]# zfs set autobackup:offsite1=false rpool/swap
NAME PROPERTY VALUE SOURCE [root@pve ~]# zfs get -t filesystem,volume autobackup:offsite1
zones autobackup:smartos01_fs1 true local NAME PROPERTY VALUE SOURCE
zones/1eb33958-72c1-11e4-af42-ff0790f603dd autobackup:smartos01_fs1 true inherited from zones rpool autobackup:offsite1 true local
... rpool/ROOT autobackup:offsite1 true inherited from rpool
zones/backup autobackup:smartos01_fs1 false local rpool/ROOT/pve-1 autobackup:offsite1 true inherited from rpool
zones/backup/fs1 autobackup:smartos01_fs1 false inherited from zones/backup rpool/data autobackup:offsite1 true inherited from rpool
rpool/data/vm-100-disk-0 autobackup:offsite1 true inherited from rpool
rpool/swap autobackup:offsite1 false local
... ...
``` ```
### Running zfs-autobackup
Running zfs_autobackup
----------------------
There are 2 ways to run the backup, but the endresult is always the same. Its just a matter of security (trust relations between the servers) and preference. There are 2 ways to run the backup, but the endresult is always the same. Its just a matter of security (trust relations between the servers) and preference.
First install the ssh-key on the server that you specify with --ssh-source or --ssh-target. First install the ssh-key on the server that you specify with --ssh-source or --ssh-target.
Method 1: Run the script on the backup server and pull the data from the server specfied by --ssh-source. This is usually the preferred way and prevents a hacked server from accesing the backup-data: #### Method 1: Run the script on the backup server and pull the data from the server specfied by --ssh-source. This is usually the preferred way and prevents a hacked server from accesing the backup-data
```
root@fs1:/home/psy# ./zfs_autobackup --ssh-source root@1.2.3.4 smartos01_fs1 fs1/zones/backup/zfsbackups/smartos01.server.com --verbose ```console
Getting selected source filesystems for backup smartos01_fs1 on root@1.2.3.4 [root@backup ~]# zfs-autobackup --ssh-source pve.server.com offsite1 backup/pve --progress --verbose --resume
Selected: zones (direct selection)
Selected: zones/1eb33958-72c1-11e4-af42-ff0790f603dd (inherited selection) #### Settings summary
Selected: zones/325dbc5e-2b90-11e3-8a3e-bfdcb1582a8d (inherited selection) [Source] Datasets on: pve.server.com
... [Source] Keep the last 10 snapshots.
Ignoring: zones/backup (disabled) [Source] Keep oldest of 1 day, delete after 1 week.
Ignoring: zones/backup/fs1 (disabled) [Source] Keep oldest of 1 week, delete after 1 month.
... [Source] Keep oldest of 1 month, delete after 1 year.
Creating source snapshot smartos01_fs1-20151030203738 on root@1.2.3.4 [Source] Send all datasets that have 'autobackup:offsite1=true' or 'autobackup:offsite1=child'
Getting source snapshot-list from root@1.2.3.4
Getting target snapshot-list from local [Target] Datasets are local
Tranferring zones incremental backup between snapshots smartos01_fs1-20151030175345...smartos01_fs1-20151030203738 [Target] Keep the last 10 snapshots.
... [Target] Keep oldest of 1 day, delete after 1 week.
received 1.09MB stream in 1 seconds (1.09MB/sec) [Target] Keep oldest of 1 week, delete after 1 month.
Destroying old snapshots on source [Target] Keep oldest of 1 month, delete after 1 year.
Destroying old snapshots on target [Target] Receive datasets under: backup/pve
All done
#### Selecting
[Source] rpool: Selected (direct selection)
[Source] rpool/ROOT: Selected (inherited selection)
[Source] rpool/ROOT/pve-1: Selected (inherited selection)
[Source] rpool/data: Selected (inherited selection)
[Source] rpool/data/vm-100-disk-0: Selected (inherited selection)
[Source] rpool/swap: Ignored (disabled)
#### Snapshotting
[Source] rpool: No changes since offsite1-20200218175435
[Source] rpool/ROOT: No changes since offsite1-20200218175435
[Source] rpool/data: No changes since offsite1-20200218175435
[Source] Creating snapshot offsite1-20200218180123
#### Transferring
[Target] backup/pve/rpool/ROOT/pve-1@offsite1-20200218175435: resuming
[Target] backup/pve/rpool/ROOT/pve-1@offsite1-20200218175435: receiving full
[Target] backup/pve/rpool/ROOT/pve-1@offsite1-20200218175547: receiving incremental
[Target] backup/pve/rpool/ROOT/pve-1@offsite1-20200218175706: receiving incremental
[Target] backup/pve/rpool/ROOT/pve-1@offsite1-20200218180049: receiving incremental
[Target] backup/pve/rpool/ROOT/pve-1@offsite1-20200218180123: receiving incremental
[Target] backup/pve/rpool/data@offsite1-20200218175435: receiving full
[Target] backup/pve/rpool/data/vm-100-disk-0@offsite1-20200218175435: receiving full
...
``` ```
Method 2: Run the script on the server and push the data to the backup server specified by --ssh-target: #### Method 2: Run the script on the server and push the data to the backup server specified by --ssh-target
```
./zfs_autobackup --ssh-target root@2.2.2.2 smartos01_fs1 fs1/zones/backup/zfsbackups/smartos01.server.com --verbose --compress ```console
... [root@pve ~]# zfs-autobackup --ssh-target backup.server.com offsite1 backup/pve --progress --verbose --resume
All done
#### Settings summary
[Source] Datasets are local
[Source] Keep the last 10 snapshots.
[Source] Keep oldest of 1 day, delete after 1 week.
[Source] Keep oldest of 1 week, delete after 1 month.
[Source] Keep oldest of 1 month, delete after 1 year.
[Source] Send all datasets that have 'autobackup:offsite1=true' or 'autobackup:offsite1=child'
[Target] Datasets on: backup.server.com
[Target] Keep the last 10 snapshots.
[Target] Keep oldest of 1 day, delete after 1 week.
[Target] Keep oldest of 1 week, delete after 1 month.
[Target] Keep oldest of 1 month, delete after 1 year.
[Target] Receive datasets under: backup/pve
...
``` ```
Tips
====
* Set the ```readonly``` property of the target filesystem to ```on```. This prevents changes on the target side. If there are changes the next backup will fail and will require a zfs rollback. (by using the --rollback option for example) ### Automatic backups
* Use ```--clear-refreservation``` to save space on your backup server.
* Use ```--clear-mountpoint``` to prevent the target server from mounting the backupped filesystem in the wrong place during a reboot. If this happens on systems like SmartOS or Openindia, svc://filesystem/local wont be able to mount some stuff and you need to resolve these issues on the console.
Speeding up SSH and prevent connection flooding Now everytime you run the command, zfs-autobackup will create a new snapshot and replicate your data.
-----------------------------------------------
Older snapshots will evertually be deleted, depending on the --keep-source and --keep-target settings. (The defaults are shown above under the 'Settings summary')
Once you've got the correct settings for your situation, you can just store the command in a cronjob. Or just create a script and run it manually when you need it.
## Tips
* Use ```--verbose``` to see details, otherwise zfs-autobackup will be quiet and only show errors, like a nice unix command.
* Use ```--debug``` if something goes wrong and you want to see the commands that are executed. This will also stop at the first error.
* Use ```--resume``` to be able to resume aborted backups. (not all zfs versions support this)
* Set the ```readonly``` property of the target filesystem to ```on```. This prevents changes on the target side. If there are changes the next backup will fail and will require a zfs rollback. (by using the --rollback option for example)
* Use ```--clear-refreservation``` to save space on your backup server.
* Use ```--clear-mountpoint``` to prevent the target server from mounting the backupped filesystem in the wrong place during a reboot.
### Speeding up SSH and prevent connection flooding
Add this to your ~/.ssh/config: Add this to your ~/.ssh/config:
```
```console
Host * Host *
ControlPath ~/.ssh/control-master-%r@%h:%p ControlPath ~/.ssh/control-master-%r@%h:%p
ControlMaster auto ControlMaster auto
ControlPersist 3600 ControlPersist 3600
``` ```
This will make all your ssh connections persistent and greatly speed up zfs_autobackup for jobs with short intervals. This will make all your ssh connections persistent and greatly speed up zfs-autobackup for jobs with short intervals.
Thanks @mariusvw :) Thanks @mariusvw :)
### Specifying ssh port or options
Specifying ssh port or options
------------------------------
The correct way to do this is by creating ~/.ssh/config: The correct way to do this is by creating ~/.ssh/config:
```
```console
Host smartos04 Host smartos04
Hostname 1.2.3.4 Hostname 1.2.3.4
Port 1234 Port 1234
@ -230,96 +321,86 @@ Also uses compression on slow links.
Look in man ssh_config for many more options. Look in man ssh_config for many more options.
Troubleshooting ## Troubleshooting
===============
`cannot receive incremental stream: invalid backup stream` > ### cannot receive incremental stream: invalid backup stream
This usually means you've created a new snapshot on the target side during a backup. This usually means you've created a new snapshot on the target side during a backup:
* Solution 1: Restart zfs_autobackup and make sure you dont use --resume. If you did use --resume, be sure to "abort" the recveive on the target side with zfs recv -A.
* Solution 2: Destroy the newly created snapshot and restart zfs_autobackup.
* Solution 1: Restart zfs-autobackup and make sure you dont use --resume. If you did use --resume, be sure to "abort" the recveive on the target side with zfs recv -A.
* Solution 2: Destroy the newly created snapshot and restart zfs-autobackup.
`internal error: Invalid argument` > ### internal error: Invalid argument
In some cases (Linux -> FreeBSD) this means certain properties are not fully supported on the target system. In some cases (Linux -> FreeBSD) this means certain properties are not fully supported on the target system.
Try using something like: --filter-properties xattr Try using something like: --filter-properties xattr
## Restore example
Restore example
===============
Restoring can be done with simple zfs commands. For example, use this to restore a specific SmartOS disk image to a temporary restore location: Restoring can be done with simple zfs commands. For example, use this to restore a specific SmartOS disk image to a temporary restore location:
```console
```
root@fs1:/home/psy# zfs send fs1/zones/backup/zfsbackups/smartos01.server.com/zones/a3abd6c8-24c6-4125-9e35-192e2eca5908-disk0@smartos01_fs1-20160110000003 | ssh root@2.2.2.2 "zfs recv zones/restore" root@fs1:/home/psy# zfs send fs1/zones/backup/zfsbackups/smartos01.server.com/zones/a3abd6c8-24c6-4125-9e35-192e2eca5908-disk0@smartos01_fs1-20160110000003 | ssh root@2.2.2.2 "zfs recv zones/restore"
``` ```
After that you can rename the disk image from the temporary location to the location of a new SmartOS machine you've created. After that you can rename the disk image from the temporary location to the location of a new SmartOS machine you've created.
## Monitoring with Zabbix-jobs
Monitoring with Zabbix-jobs You can monitor backups by using my zabbix-jobs script. (<https://github.com/psy0rz/stuff/tree/master/zabbix-jobs>)
===========================
You can monitor backups by using my zabbix-jobs script. (https://github.com/psy0rz/stuff/tree/master/zabbix-jobs)
Put this command directly after the zfs_backup command in your cronjob: Put this command directly after the zfs_backup command in your cronjob:
```
```console
zabbix-job-status backup_smartos01_fs1 daily $? zabbix-job-status backup_smartos01_fs1 daily $?
``` ```
This will update the zabbix server with the exitcode and will also alert you if the job didnt run for more than 2 days. This will update the zabbix server with the exitcode and will also alert you if the job didnt run for more than 2 days.
## Backuping up a proxmox cluster with HA replication
Backuping up a proxmox cluster with HA replication Due to the nature of proxmox we had to make a few enhancements to zfs-autobackup. This will probably also benefit other systems that use their own replication in combination with zfs-autobackup.
==================================================
Due to the nature of proxmox we had to make a few enhancements to zfs_autobackup. This will probably also benefit other systems that use their own replication in combination with zfs_autobackup.
All data under rpool/data can be on multiple nodes of the cluster. The naming of those filesystem is unique over the whole cluster. Because of this we should backup rpool/data of all nodes to the same destination. This way we wont have duplicate backups of the filesystems that are replicated. Because of various options, you can even migrate hosts and zfs_autobackup will be fine. (and it will get the next backup from the new node automaticly)
All data under rpool/data can be on multiple nodes of the cluster. The naming of those filesystem is unique over the whole cluster. Because of this we should backup rpool/data of all nodes to the same destination. This way we wont have duplicate backups of the filesystems that are replicated. Because of various options, you can even migrate hosts and zfs-autobackup will be fine. (and it will get the next backup from the new node automaticly)
In the example below we have 3 nodes, named h4, h5 and h6. In the example below we have 3 nodes, named h4, h5 and h6.
The backup will go to a machine named smartos03. The backup will go to a machine named smartos03.
Preparing the proxmox nodes ### Preparing the proxmox nodes
---------------------------
On each node select the filesystems as following: On each node select the filesystems as following:
```
```console
root@h4:~# zfs set autobackup:h4_smartos03=true rpool root@h4:~# zfs set autobackup:h4_smartos03=true rpool
root@h4:~# zfs set autobackup:h4_smartos03=false rpool/data root@h4:~# zfs set autobackup:h4_smartos03=false rpool/data
root@h4:~# zfs set autobackup:data_smartos03=child rpool/data root@h4:~# zfs set autobackup:data_smartos03=child rpool/data
``` ```
* rpool will be backuped the usual way, and is named h4_smartos03. (each node will have a unique name) * rpool will be backuped the usual way, and is named h4_smartos03. (each node will have a unique name)
* rpool/data will be excluded from the usual backup * rpool/data will be excluded from the usual backup
* The CHILDREN of rpool/data be selected for a cluster wide backup named data_smartos03. (each node uses the same backup name) * The CHILDREN of rpool/data be selected for a cluster wide backup named data_smartos03. (each node uses the same backup name)
### Preparing the backup server
Preparing the backup server
---------------------------
Extra options needed for proxmox with HA: Extra options needed for proxmox with HA:
* --no-holds: To allow proxmox to destroy our snapshots if a VM migrates to another node. * --no-holds: To allow proxmox to destroy our snapshots if a VM migrates to another node.
* --ignore-replicated: To ignore the replicated filesystems of proxmox on the receiving proxmox nodes. (e.g: only backup from the node where the VM is active) * --ignore-replicated: To ignore the replicated filesystems of proxmox on the receiving proxmox nodes. (e.g: only backup from the node where the VM is active)
I use the following backup script on the backup server: I use the following backup script on the backup server:
```
```shell
for H in h4 h5 h6; do for H in h4 h5 h6; do
echo "################################### DATA $H" echo "################################### DATA $H"
#backup data filesystems to a common place #backup data filesystems to a common place
./zfs_autobackup --ssh-source root@$H data_smartos03 zones/backup/zfsbackups/pxe1_data --clear-refreservation --clear-mountpoint --ignore-transfer-errors --strip-path 2 --verbose --resume --ignore-replicated --no-holds $@ ./zfs-autobackup --ssh-source root@$H data_smartos03 zones/backup/zfsbackups/pxe1_data --clear-refreservation --clear-mountpoint --ignore-transfer-errors --strip-path 2 --verbose --resume --ignore-replicated --no-holds $@
zabbix-job-status backup_$H""_data_smartos03 daily $? >/dev/null 2>/dev/null zabbix-job-status backup_$H""_data_smartos03 daily $? >/dev/null 2>/dev/null
echo "################################### RPOOL $H" echo "################################### RPOOL $H"
#backup rpool to own place #backup rpool to own place
./zfs_autobackup --ssh-source root@$H $H""_smartos03 zones/backup/zfsbackups/$H --verbose --clear-refreservation --clear-mountpoint --resume --ignore-transfer-errors $@ ./zfs-autobackup --ssh-source root@$H $H""_smartos03 zones/backup/zfsbackups/$H --verbose --clear-refreservation --clear-mountpoint --resume --ignore-transfer-errors $@
zabbix-job-status backup_$H""_smartos03 daily $? >/dev/null 2>/dev/null zabbix-job-status backup_$H""_smartos03 daily $? >/dev/null 2>/dev/null
done done
``` ```

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#!/bin/bash
set -e
rm -rf dist
python3 setup.py sdist bdist_wheel
# python2 setup.py sdist bdist_wheel
gnome-keyring-daemon
source token
python3 -m twine check dist/*
python3 -m twine upload dist/*

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#!/bin/bash
set -e
rm -rf dist
python3 setup.py sdist bdist_wheel
# python2 setup.py sdist bdist_wheel
gnome-keyring-daemon
source tokentest
python3 -m twine check dist/*
python3 -m twine upload --repository-url https://test.pypi.org/legacy/ dist/* --verbose

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import setuptools
import bin.zfs_autobackup
with open("README.md", "r") as fh:
long_description = fh.read()
setuptools.setup(
name="zfs_autobackup",
version=bin.zfs_autobackup.VERSION,
author="Edwin Eefting",
author_email="edwin@datux.nl",
description="ZFS autobackup is used to periodicly backup ZFS filesystems to other locations. It tries to be the most friendly to use and easy to debug ZFS backup tool.",
long_description=long_description,
long_description_content_type="text/markdown",
url="https://github.com/psy0rz/zfs_autobackup",
scripts=["bin/zfs_autobackup", "bin/zfs-autobackup"],
packages=setuptools.find_packages(),
classifiers=[
"Programming Language :: Python :: 2",
"Programming Language :: Python :: 3",
"License :: OSI Approved :: GNU General Public License v3 (GPLv3)",
"Operating System :: OS Independent",
],
python_requires='>=2.7',
install_requires=[
"colorama",
"argparse"
]
)

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#!/usr/bin/env python2
# -*- coding: utf8 -*-
#(C)edwin@datux.nl -- Edwin Eefting
#Release under GPL.
from __future__ import print_function
import os
import sys
import re
import traceback
import subprocess
import pprint
import time
def error(txt):
print(txt, file=sys.stderr)
def verbose(txt):
if args.verbose:
print(txt)
def debug(txt):
if args.debug:
print(txt)
#fatal abort execution, exit code 255
def abort(txt):
error(txt)
sys.exit(255)
"""run a command. specifiy ssh user@host to run remotely"""
def run(cmd, input=None, ssh_to="local", tab_split=False, valid_exitcodes=[ 0 ], test=False):
encoded_cmd=[]
#use ssh?
if ssh_to != "local":
encoded_cmd.extend(["ssh", ssh_to])
#make sure the command gets all the data in utf8 format:
#(this is neccesary if LC_ALL=en_US.utf8 is not set in the environment)
for arg in cmd:
#add single quotes for remote commands to support spaces and other wierd stuff (remote commands are executed in a shell)
encoded_cmd.append( ("'"+arg+"'").encode('utf-8'))
else:
for arg in cmd:
encoded_cmd.append(arg.encode('utf-8'))
#the accurate way of displaying it whould be: print encoded_cmd
#However, we use the more human-readable way, but this is not always properly escaped!
#(most of the time it should be copypastable however.)
debug_txt="# "+" ".join(encoded_cmd)
if test:
debug("[TEST] "+debug_txt)
else:
debug(debug_txt)
if input:
debug("INPUT:\n"+input.rstrip())
stdin=subprocess.PIPE
else:
stdin=None
if test:
return
p=subprocess.Popen(encoded_cmd, env=os.environ, stdout=subprocess.PIPE, stdin=stdin)
output=p.communicate(input=input)[0]
if p.returncode not in valid_exitcodes:
raise(subprocess.CalledProcessError(p.returncode, encoded_cmd))
lines=output.splitlines()
if not tab_split:
return(lines)
else:
ret=[]
for line in lines:
ret.append(line.split("\t"))
return(ret)
"""determine filesystems that should be backupped by looking at the special autobackup-property"""
def zfs_get_selected_filesystems(ssh_to, backup_name):
#get all source filesystems that have the backup property
source_filesystems=run(ssh_to=ssh_to, tab_split=True, cmd=[
"zfs", "get", "-t", "volume,filesystem", "-o", "name,value,source", "-s", "local,inherited", "-H", "autobackup:"+backup_name
])
#determine filesystems that should be actually backupped
selected_filesystems=[]
direct_filesystems=[]
for source_filesystem in source_filesystems:
(name,value,source)=source_filesystem
if value=="false":
verbose("* Ignored : {0} (disabled)".format(name))
else:
if source=="local" and ( value=="true" or value=="child"):
direct_filesystems.append(name)
if source=="local" and value=="true":
selected_filesystems.append(name)
verbose("* Selected: {0} (direct selection)".format(name))
elif source.find("inherited from ")==0 and (value=="true" or value=="child"):
inherited_from=re.sub("^inherited from ", "", source)
if inherited_from in direct_filesystems:
selected_filesystems.append(name)
verbose("* Selected: {0} (inherited selection)".format(name))
else:
verbose("* Ignored : {0} (already a backup)".format(name))
else:
verbose("* Ignored : {0} (only childs)".format(name))
return(selected_filesystems)
"""determine filesystems that can be resumed via receive_resume_token"""
def zfs_get_resumable_filesystems(ssh_to, filesystems):
cmd=[ "zfs", "get", "-t", "volume,filesystem", "-o", "name,value", "-H", "receive_resume_token" ]
cmd.extend(filesystems)
resumable_filesystems=run(ssh_to=ssh_to, tab_split=True, cmd=cmd, valid_exitcodes= [ 0,1 ] )
ret={}
for (resumable_filesystem,token) in resumable_filesystems:
if token!='-':
ret[resumable_filesystem]=token
return(ret)
"""deferred destroy list of snapshots (in @format). """
def zfs_destroy_snapshots(ssh_to, snapshots):
#zfs can only destroy one filesystem at once so we use xargs and stdin
run(ssh_to=ssh_to, test=args.test, input="\0".join(snapshots), cmd=
[ "xargs", "-0", "-n", "1", "zfs", "destroy", "-d" ]
)
"""destroy list of filesystems """
def zfs_destroy(ssh_to, filesystems, recursive=False):
cmd=[ "xargs", "-0", "-n", "1", "zfs", "destroy" ]
if recursive:
cmd.append("-r")
#zfs can only destroy one filesystem at once so we use xargs and stdin
run(ssh_to=ssh_to, test=args.test, input="\0".join(filesystems), cmd=cmd)
#simulate snapshots for --test option
test_snapshots={}
"""create snapshot on multiple filesystems at once (atomicly per pool)"""
def zfs_create_snapshot(ssh_to, filesystems, snapshot):
#collect per pool, zfs can only take atomic snapshots per pool
pools={}
for filesystem in filesystems:
pool=filesystem.split('/')[0]
if pool not in pools:
pools[pool]=[]
pools[pool].append(filesystem)
for pool in pools:
cmd=[ "zfs", "snapshot" ]
for filesystem in pools[pool]:
cmd.append(filesystem+"@"+snapshot)
#in testmode we dont actually make changes, so keep them in a list to simulate
# if args.test:
# if not ssh_to in test_snapshots:
# test_snapshots[ssh_to]={}
# if not filesystem in test_snapshots[ssh_to]:
# test_snapshots[ssh_to][filesystem]=[]
# test_snapshots[ssh_to][filesystem].append(snapshot)
run(ssh_to=ssh_to, tab_split=False, cmd=cmd, test=args.test)
"""get names of all snapshots for specified filesystems belonging to backup_name
return[filesystem_name]=[ "snashot1", "snapshot2", ... ]
"""
def zfs_get_snapshots(ssh_to, filesystems, backup_name):
ret={}
if filesystems:
cmd=[
"zfs", "list", "-d", "1", "-r", "-t" ,"snapshot", "-H", "-o", "name"
]
cmd.extend(filesystems)
snapshots=run(ssh_to=ssh_to, tab_split=False, cmd=cmd, valid_exitcodes=[ 0 ])
for snapshot in snapshots:
(filesystem, snapshot_name)=snapshot.split("@")
if re.match("^"+backup_name+"-[0-9]*$", snapshot_name):
if not filesystem in ret:
ret[filesystem]=[]
ret[filesystem].append(snapshot_name)
#also add any test-snapshots that where created with --test mode
# if args.test:
# if ssh_to in test_snapshots:
# for filesystem in filesystems:
# if filesystem in test_snapshots[ssh_to]:
# if not filesystem in ret:
# ret[filesystem]=[]
# ret[filesystem].extend(test_snapshots[ssh_to][filesystem])
return(ret)
def default_tag():
return("zfs_autobackup:"+args.backup_name)
"""hold a snapshot so it cant be destroyed accidently by admin or other processes"""
def zfs_hold_snapshot(ssh_to, snapshot, tag=None):
cmd=[
"zfs", "hold", tag or default_tag(), snapshot
]
run(ssh_to=ssh_to, test=args.test, tab_split=False, cmd=cmd, valid_exitcodes=[ 0, 1 ])
"""release a snapshot"""
def zfs_release_snapshot(ssh_to, snapshot, tag=None):
cmd=[
"zfs", "release", tag or default_tag(), snapshot
]
run(ssh_to=ssh_to, test=args.test, tab_split=False, cmd=cmd, valid_exitcodes=[ 0, 1 ])
"""transfer a zfs snapshot from source to target. both can be either local or via ssh.
TODO:
(parially implemented, local buffer is a bit more annoying to do)
buffering: specify buffer_size to use mbuffer (or alike) to apply buffering where neccesary
local to local:
local send -> local buffer -> local receive
local to remote and remote to local:
local send -> local buffer -> ssh -> remote buffer -> remote receive
remote send -> remote buffer -> ssh -> local buffer -> local receive
remote to remote:
remote send -> remote buffer -> ssh -> local buffer -> ssh -> remote buffer -> remote receive
"""
def zfs_transfer(ssh_source, source_filesystem, first_snapshot, second_snapshot,
ssh_target, target_filesystem, resume_token=None, buffer_size=None):
#### build source command
source_cmd=[]
if ssh_source != "local":
source_cmd.extend([ "ssh", ssh_source ])
source_cmd.extend(["zfs", "send", ])
#all kind of performance options:
source_cmd.append("-L") # large block support
source_cmd.append("-e") # WRITE_EMBEDDED, more compact stream
source_cmd.append("-c") # use compressed WRITE records
if not args.resume:
source_cmd.append("-D") # dedupped stream, sends less duplicate data
#only verbose in debug mode, lots of output
if args.debug :
source_cmd.append("-v")
if not first_snapshot:
txt=">>> Transfer: "+source_filesystem+"@"+second_snapshot
else:
txt=">>> Transfer: "+source_filesystem+"@"+first_snapshot+"...@"+second_snapshot
if resume_token:
source_cmd.extend([ "-t", resume_token ])
txt=txt+" [RESUMED]"
else:
source_cmd.append("-p")
if first_snapshot:
source_cmd.extend([ "-i", first_snapshot ])
if ssh_source != "local":
source_cmd.append("'" + source_filesystem + "@" + second_snapshot + "'")
else:
source_cmd.append(source_filesystem + "@" + second_snapshot)
verbose(txt)
if args.buffer and args.ssh_source!="local":
source_cmd.append("|mbuffer -m {}".format(args.buffer))
#### build target command
target_cmd=[]
if ssh_target != "local":
target_cmd.extend([ "ssh", ssh_target ])
target_cmd.extend(["zfs", "recv", "-u" ])
# filter certain properties on receive (usefull for linux->freebsd in some cases)
if args.filter_properties:
for filter_property in args.filter_properties:
target_cmd.extend([ "-x" , filter_property ])
if args.debug:
target_cmd.append("-v")
if args.resume:
target_cmd.append("-s")
if ssh_target!="local":
target_cmd.append("'" + target_filesystem + "'")
else:
target_cmd.append(target_filesystem)
if args.buffer and args.ssh_target!="local":
target_cmd.append("|mbuffer -m {}".format(args.buffer))
#### make sure parent on target exists
parent_filesystem= "/".join(target_filesystem.split("/")[:-1])
run(ssh_to=ssh_target, cmd=[ "zfs", "create" ,"-p", parent_filesystem ], test=args.test)
### execute pipe
debug_txt="# "+source_cmd[0]+" '"+("' '".join(source_cmd[1:]))+"'" + " | " + target_cmd[0]+" '"+("' '".join(target_cmd[1:]))+"'"
if args.test:
debug("[TEST] "+debug_txt)
return
else:
debug(debug_txt)
source_proc=subprocess.Popen(source_cmd, env=os.environ, stdout=subprocess.PIPE)
target_proc=subprocess.Popen(target_cmd, env=os.environ, stdin=source_proc.stdout)
source_proc.stdout.close() # Allow p1 to receive a SIGPIPE if p2 exits.
target_proc.communicate()
if not args.ignore_transfer_errors:
if source_proc.returncode:
raise(subprocess.CalledProcessError(source_proc.returncode, source_cmd))
#zfs recv sometimes gives an exitcode 1 while the transfer was succesfull, therefore we ignore exit 1's and do an extra check to see if the snapshot is there.
if target_proc.returncode and target_proc.returncode!=1:
raise(subprocess.CalledProcessError(target_proc.returncode, target_cmd))
debug("Verifying if snapshot exists on target")
run(ssh_to=ssh_target, cmd=["zfs", "list", target_filesystem+"@"+second_snapshot ])
#NOTE: unreliable when using with autobackup:bla=child
# """get filesystems that where already backupped to a target. """
# def zfs_get_backupped_filesystems(ssh_to, backup_name, target_path):
# #get all target filesystems that have received or inherited the backup propert, under the target_path tree
# ret=run(ssh_to=ssh_to, tab_split=False, valid_exitcodes=[ 0,1 ], cmd=[
# "zfs", "get", "-r", "-t", "volume,filesystem", "-o", "name", "-s", "received,inherited", "-H", "autobackup:"+backup_name, target_path
# ])
#
# return(ret)
"""get existing filesystems """
def zfs_get_existing_filesystems(ssh_to, target_path):
#get all target filesystems that have received or inherited the backup propert, under the target_path tree
ret=run(ssh_to=ssh_to, tab_split=False, valid_exitcodes=[ 0,1 ], cmd=[
"zfs", "list", "-r", "-t", "volume,filesystem", "-o", "name", "-H", target_path
])
return(ret)
"""get filesystems that where once backupped to target but are no longer selected on source
these are filesystems that are not in the list in target_filesystems.
this happens when filesystems are destroyed or unselected on the source.
"""
def get_stale_backupped_filesystems(backup_name, target_path, target_filesystems, existing_target_filesystems):
#determine backupped filesystems that are not in target_filesystems anymore
stale_backupped_filesystems=[]
for existing_target_filesystem in existing_target_filesystems:
if existing_target_filesystem not in target_filesystems:
stale_backupped_filesystems.append(existing_target_filesystem)
return(stale_backupped_filesystems)
now=time.time()
"""determine list of snapshot (in @format) to destroy, according to age"""
def determine_destroy_list(snapshots, days):
ret=[]
for filesystem in snapshots:
for snapshot in snapshots[filesystem]:
time_str=re.findall("^.*-([0-9]*)$", snapshot)[0]
if len(time_str)==14:
#new format:
time_secs=time.mktime(time.strptime(time_str,"%Y%m%d%H%M%S"))
else:
time_secs=int(time_str)
# verbose("time_secs"+time_str)
if (now-time_secs) > (24 * 3600 * days):
ret.append(filesystem+"@"+snapshot)
return(ret)
def lstrip_path(path, count):
return("/".join(path.split("/")[count:]))
"""get list of filesystems that are changed, compared to specified latest snapshot. """
def zfs_get_unchanged_snapshots(ssh_to, snapshots):
ret=[]
for ( filesystem, snapshot_list ) in snapshots.items():
latest_snapshot=snapshot_list[-1]
cmd=[ "zfs", "get","-H" ,"-ovalue", "written@"+latest_snapshot, filesystem ]
output=run(ssh_to=ssh_to, tab_split=False, cmd=cmd, valid_exitcodes=[ 0 ])
if output[0]=="0B" or output[0]=="0":
ret.append(filesystem)
return(ret)
"""get filesytems that are have changed since any snapshot."""
def zfs_get_unchanged_filesystems(ssh_to, filesystems):
ret=[]
cmd=[ "zfs", "get","-H" ,"-oname,value", "written" ]
cmd.extend(filesystems)
output=run(ssh_to=ssh_to, tab_split=True, cmd=cmd, valid_exitcodes=[ 0 ])
for ( filesystem , written ) in output:
if written=="0B" or written=="0":
ret.append(filesystem)
return(ret)
#fugly..
failures=0
#something failed, but we try to continue with the rest
def failed(txt):
global failures
failures=failures+1
error("FAILURE: "+txt+"\n")
def zfs_autobackup():
############## data gathering section
if args.test:
args.verbose=True
verbose("RUNNING IN TEST-MODE, NOT MAKING ACTUAL BACKUP!")
### getting and determinging source/target filesystems
# get selected filesystems on backup source
verbose("Getting selected source filesystems for backup {0} on {1}".format(args.backup_name,args.ssh_source))
source_filesystems=zfs_get_selected_filesystems(args.ssh_source, args.backup_name)
#nothing todo
if not source_filesystems:
abort("No source filesystems selected, please do a 'zfs set autobackup:{0}=true' on {1}".format(args.backup_name,args.ssh_source))
if args.ignore_replicated:
replicated_filesystems=zfs_get_unchanged_filesystems(args.ssh_source, source_filesystems)
for replicated_filesystem in replicated_filesystems:
if replicated_filesystem in source_filesystems:
source_filesystems.remove(replicated_filesystem)
verbose("* Already replicated: {}".format(replicated_filesystem))
if not source_filesystems:
verbose("Nothing to do, all filesystems are already replicated.")
sys.exit(0)
# determine target filesystems
target_filesystems=[]
for source_filesystem in source_filesystems:
#append args.target_path prefix and strip args.strip_path paths from source_filesystem
target_filesystems.append(args.target_path + "/" + lstrip_path(source_filesystem, args.strip_path))
debug("Wanted target filesystems:\n"+str(pprint.pformat(target_filesystems)))
# get actual existing target filesystems. (including ones that might not be in the backupset anymore)
verbose("Getting existing target filesystems")
existing_target_filesystems=zfs_get_existing_filesystems(ssh_to=args.ssh_target, target_path=args.target_path)
debug("Existing target filesystems:\n"+str(pprint.pformat(existing_target_filesystems)))
common_target_filesystems=list(set(target_filesystems) & set(existing_target_filesystems))
debug("Common target filesystems (target filesystems that also exist on source):\n"+str(pprint.pformat(common_target_filesystems)))
### get resumable transfers from target
resumable_target_filesystems={}
if args.resume:
verbose("Checking for aborted transfers that can be resumed")
#Important: use target_filesystem, not existing_target_filesystems (during initial transfer its resumable but doesnt exsit yet)
resumable_target_filesystems=zfs_get_resumable_filesystems(args.ssh_target, target_filesystems)
debug("Resumable filesystems:\n"+str(pprint.pformat(resumable_target_filesystems)))
### get existing target snapshots
target_snapshots={}
if common_target_filesystems:
verbose("Getting target snapshot-list from {0}".format(args.ssh_target))
target_snapshots=zfs_get_snapshots(args.ssh_target, common_target_filesystems, args.backup_name)
# except subprocess.CalledProcessError:
# verbose("(ignoring errors, probably initial backup for this filesystem)")
# pass
debug("Target snapshots:\n" + str(pprint.pformat(target_snapshots)))
### get eixsting source snapshots
verbose("Getting source snapshot-list from {0}".format(args.ssh_source))
source_snapshots=zfs_get_snapshots(args.ssh_source, source_filesystems, args.backup_name)
debug("Source snapshots:\n" + str(pprint.pformat(source_snapshots)))
### create new snapshots on source
if not args.no_snapshot:
#determine which filesystems changed since last snapshot
if not args.allow_empty and not args.ignore_replicated:
#determine which filesystemn are unchanged since OUR snapshots. (not since ANY snapshot)
unchanged_filesystems=zfs_get_unchanged_snapshots(args.ssh_source, source_snapshots)
else:
unchanged_filesystems=[]
snapshot_filesystems=[]
for source_filesystem in source_filesystems:
if source_filesystem not in unchanged_filesystems:
snapshot_filesystems.append(source_filesystem)
else:
verbose("* Not snapshotting {}, no changes found.".format(source_filesystem))
#create snapshots
if snapshot_filesystems:
new_snapshot_name=args.backup_name+"-"+time.strftime("%Y%m%d%H%M%S")
verbose("Creating source snapshots {0} on {1} ".format(new_snapshot_name, args.ssh_source))
zfs_create_snapshot(args.ssh_source, snapshot_filesystems, new_snapshot_name)
else:
verbose("No changes at all, not creating snapshot.")
#add it to the list of source filesystems
for snapshot_filesystem in snapshot_filesystems:
source_snapshots.setdefault(snapshot_filesystem,[]).append(new_snapshot_name)
#obsolete snapshots that may be removed
source_obsolete_snapshots={}
target_obsolete_snapshots={}
############## backup section
#determine which snapshots to send for each filesystem
for source_filesystem in source_filesystems:
try:
target_filesystem=args.target_path + "/" + lstrip_path(source_filesystem, args.strip_path)
if source_filesystem not in source_snapshots:
#this happens if you use --no-snapshot and there are new filesystems without snapshots
verbose("* Skipping source filesystem {0}, no snapshots found".format(source_filesystem))
else:
#incremental or initial send?
if target_filesystem in target_snapshots and target_snapshots[target_filesystem]:
#incremental mode, determine what to send and what is obsolete
#latest succesfully send snapshot, should be common on both source and target
latest_target_snapshot=target_snapshots[target_filesystem][-1]
if latest_target_snapshot not in source_snapshots[source_filesystem]:
#cant find latest target anymore. find first common snapshot and inform user
error_msg="Cant find latest target snapshot on source for '{}', did you destroy/rename it?".format(source_filesystem)
error_msg=error_msg+"\nLatest on target : "+target_filesystem+"@"+latest_target_snapshot
error_msg=error_msg+"\nMissing on source: "+source_filesystem+"@"+latest_target_snapshot
found=False
for latest_target_snapshot in reversed(target_snapshots[target_filesystem]):
if latest_target_snapshot in source_snapshots[source_filesystem]:
error_msg=error_msg+"\nYou could solve this by rolling back to this common snapshot on target: "+target_filesystem+"@"+latest_target_snapshot
found=True
break
if not found:
error_msg=error_msg+"\nAlso could not find an earlier common snapshot to rollback to."
else:
if args.ignore_new:
verbose("* Skipping source filesystem '{0}', target already has newer snapshots.".format(source_filesystem))
continue
raise(Exception(error_msg))
#send all new source snapshots that come AFTER the last target snapshot
latest_source_index=source_snapshots[source_filesystem].index(latest_target_snapshot)
send_snapshots=source_snapshots[source_filesystem][latest_source_index+1:]
#source snapshots that come BEFORE last target snapshot are obsolete
source_obsolete_snapshots[source_filesystem]=source_snapshots[source_filesystem][0:latest_source_index]
#target snapshots that come BEFORE last target snapshot are obsolete
latest_target_index=target_snapshots[target_filesystem].index(latest_target_snapshot)
target_obsolete_snapshots[target_filesystem]=target_snapshots[target_filesystem][0:latest_target_index]
else:
#initial mode, send all snapshots, nothing is obsolete:
latest_target_snapshot=None
send_snapshots=source_snapshots[source_filesystem]
target_obsolete_snapshots[target_filesystem]=[]
source_obsolete_snapshots[source_filesystem]=[]
#now actually send the snapshots
if not args.no_send:
if send_snapshots and args.rollback and latest_target_snapshot:
#roll back any changes on target
debug("Rolling back target to latest snapshot.")
run(ssh_to=args.ssh_target, test=args.test, cmd=["zfs", "rollback", target_filesystem+"@"+latest_target_snapshot ])
for send_snapshot in send_snapshots:
#resumable?
if target_filesystem in resumable_target_filesystems:
resume_token=resumable_target_filesystems.pop(target_filesystem)
else:
resume_token=None
#hold the snapshot we're sending on the source
if not args.no_holds:
zfs_hold_snapshot(ssh_to=args.ssh_source, snapshot=source_filesystem+"@"+send_snapshot)
zfs_transfer(
ssh_source=args.ssh_source, source_filesystem=source_filesystem,
first_snapshot=latest_target_snapshot, second_snapshot=send_snapshot,
ssh_target=args.ssh_target, target_filesystem=target_filesystem,
resume_token=resume_token
)
#hold the snapshot we just send to the target
zfs_hold_snapshot(ssh_to=args.ssh_target, snapshot=target_filesystem+"@"+send_snapshot)
#now that we succesfully transferred this snapshot, the previous snapshot is obsolete:
if latest_target_snapshot:
zfs_release_snapshot(ssh_to=args.ssh_target, snapshot=target_filesystem+"@"+latest_target_snapshot)
target_obsolete_snapshots[target_filesystem].append(latest_target_snapshot)
if not args.no_holds:
zfs_release_snapshot(ssh_to=args.ssh_source, snapshot=source_filesystem+"@"+latest_target_snapshot)
source_obsolete_snapshots[source_filesystem].append(latest_target_snapshot)
#we just received a new filesytem?
else:
if args.clear_refreservation:
debug("Clearing refreservation to save space.")
run(ssh_to=args.ssh_target, test=args.test, cmd=["zfs", "set", "refreservation=none", target_filesystem ])
if args.clear_mountpoint:
debug("Setting canmount=noauto to prevent auto-mounting in the wrong place. (ignoring errors)")
run(ssh_to=args.ssh_target, test=args.test, cmd=["zfs", "set", "canmount=noauto", target_filesystem ], valid_exitcodes= [0, 1] )
latest_target_snapshot=send_snapshot
# failed, skip this source_filesystem
except Exception as e:
failed(str(e))
############## cleanup section
#we only do cleanups after everything is complete, to keep everything consistent (same snapshots everywhere)
if not args.ignore_replicated:
#find stale backups on target that have become obsolete
stale_target_filesystems=get_stale_backupped_filesystems(backup_name=args.backup_name, target_path=args.target_path, target_filesystems=target_filesystems, existing_target_filesystems=existing_target_filesystems)
debug("Stale target filesystems: {0}".format("\n".join(stale_target_filesystems)))
stale_target_snapshots=zfs_get_snapshots(args.ssh_target, stale_target_filesystems, args.backup_name)
debug("Stale target snapshots: " + str(pprint.pformat(stale_target_snapshots)))
target_obsolete_snapshots.update(stale_target_snapshots)
#determine stale filesystems that have no snapshots left (the can be destroyed)
stale_target_destroys=[]
for stale_target_filesystem in stale_target_filesystems:
if stale_target_filesystem not in stale_target_snapshots:
stale_target_destroys.append(stale_target_filesystem)
if stale_target_destroys:
#NOTE: dont destroy automaticly..not safe enough.
# if args.destroy_stale:
# verbose("Destroying stale filesystems on target {0}:\n{1}".format(args.ssh_target, "\n".join(stale_target_destroys)))
# zfs_destroy(ssh_to=args.ssh_target, filesystems=stale_target_destroys, recursive=True)
# else:
verbose("Stale filesystems on {0}:\n{1}".format(args.ssh_target, "\n".join(stale_target_destroys)))
else:
verbose("NOTE: Cant determine stale target filesystems while using ignore_replicated.")
#now actually destroy the old snapshots
source_destroys=determine_destroy_list(source_obsolete_snapshots, args.keep_source)
if source_destroys:
verbose("Destroying old snapshots on source {0}:\n{1}".format(args.ssh_source, "\n".join(source_destroys)))
try:
zfs_destroy_snapshots(ssh_to=args.ssh_source, snapshots=source_destroys)
except Exception as e:
failed(str(e))
target_destroys=determine_destroy_list(target_obsolete_snapshots, args.keep_target)
if target_destroys:
verbose("Destroying old snapshots on target {0}:\n{1}".format(args.ssh_target, "\n".join(target_destroys)))
try:
zfs_destroy_snapshots(ssh_to=args.ssh_target, snapshots=target_destroys)
except Exception as e:
failed(str(e))
################################################################## ENTRY POINT
# parse arguments
import argparse
parser = argparse.ArgumentParser(
description='ZFS autobackup v2.4',
epilog='When a filesystem fails, zfs_backup will continue and report the number of failures at that end. Also the exit code will indicate the number of failures.')
parser.add_argument('--ssh-source', default="local", help='Source host to get backup from. (user@hostname) Default %(default)s.')
parser.add_argument('--ssh-target', default="local", help='Target host to push backup to. (user@hostname) Default %(default)s.')
parser.add_argument('--keep-source', type=int, default=30, help='Number of days to keep old snapshots on source. Default %(default)s.')
parser.add_argument('--keep-target', type=int, default=30, help='Number of days to keep old snapshots on target. Default %(default)s.')
parser.add_argument('backup_name', help='Name of the backup (you should set the zfs property "autobackup:backup-name" to true on filesystems you want to backup')
parser.add_argument('target_path', help='Target path')
parser.add_argument('--no-snapshot', action='store_true', help='dont create new snapshot (usefull for finishing uncompleted backups, or cleanups)')
parser.add_argument('--no-send', action='store_true', help='dont send snapshots (usefull to only do a cleanup)')
parser.add_argument('--allow-empty', action='store_true', help='if nothing has changed, still create empty snapshots.')
parser.add_argument('--ignore-replicated', action='store_true', help='Ignore datasets that seem to be replicated some other way. (No changes since lastest snapshot. Usefull for proxmox HA replication)')
parser.add_argument('--no-holds', action='store_true', help='Dont lock snapshots on the source. (Usefull to allow proxmox HA replication to switches nodes)')
parser.add_argument('--ignore-new', action='store_true', help='Ignore filesystem if there are already newer snapshots for it on the target (use with caution)')
parser.add_argument('--resume', action='store_true', help='support resuming of interrupted transfers by using the zfs extensible_dataset feature (both zpools should have it enabled) Disadvantage is that you need to use zfs recv -A if another snapshot is created on the target during a receive. Otherwise it will keep failing.')
parser.add_argument('--strip-path', default=0, type=int, help='number of directory to strip from path (use 1 when cloning zones between 2 SmartOS machines)')
parser.add_argument('--buffer', default="", help='Use mbuffer with specified size to speedup zfs transfer. (e.g. --buffer 1G) Will also show nice progress output.')
# parser.add_argument('--destroy-stale', action='store_true', help='Destroy stale backups that have no more snapshots. Be sure to verify the output before using this! ')
parser.add_argument('--clear-refreservation', action='store_true', help='Set refreservation property to none for new filesystems. Usefull when backupping SmartOS volumes. (recommended)')
parser.add_argument('--clear-mountpoint', action='store_true', help='Sets canmount=noauto property, to prevent the received filesystem from mounting over existing filesystems. (recommended)')
parser.add_argument('--filter-properties', action='append', help='Filter properties when receiving filesystems. Can be specified multiple times. (Example: If you send data from Linux to FreeNAS, you should filter xattr)')
parser.add_argument('--rollback', action='store_true', help='Rollback changes on the target before starting a backup. (normally you can prevent changes by setting the readonly property on the target_path to on)')
parser.add_argument('--ignore-transfer-errors', action='store_true', help='Ignore transfer errors (still checks if received filesystem exists. usefull for acltype errors)')
parser.add_argument('--test', action='store_true', help='dont change anything, just show what would be done (still does all read-only operations)')
parser.add_argument('--verbose', action='store_true', help='verbose output')
parser.add_argument('--debug', action='store_true', help='debug output (shows commands that are executed)')
#note args is the only global variable we use, since its a global readonly setting anyway
args = parser.parse_args()
if args.ignore_replicated and args.allow_empty:
abort("Cannot use allow_empty with ignore_replicated.")
try:
zfs_autobackup()
if not failures:
verbose("All operations completed succesfully.")
sys.exit(0)
else:
verbose("{} OPERATION(S) FAILED!".format(failures))
#exit with the number of failures.
sys.exit(min(255,failures))
except Exception as e:
if args.debug:
raise
else:
print(str(e))
abort("FATAL ERROR")