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pre/post snapshot polishing. still needs test-scripts

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Edwin Eefting
2021-06-18 17:16:18 +02:00
parent 1286bfafd0
commit 84437ee1d0
3 changed files with 31 additions and 19 deletions
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README.md
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@ -279,19 +279,6 @@ root@ws1:~# zfs-autobackup test --verbose
This also allows you to make several snapshots during the day, but only backup the data at night when the server is not busy.
## Running custom commands before and after snapshotting
If you need, e.g. to quiesce a couple of mysql databases to make on-disk data consistent before snapshotting, try:
```sh
zfs-autobackup \
--pre-snapshot-cmd 'daemon -f jexec mysqljail1 mysql -s -e "set autocommit=0;flush logs;flush tables with read lock;\\! echo \$\$ > /tmp/mysql_lock.pid && sleep 60"' \
--pre-snapshot-cmd 'daemon -f jexec mysqljail2 mysql -s -e "set autocommit=0;flush logs;flush tables with read lock;\\! echo \$\$ > /tmp/mysql_lock.pid && sleep 60"' \
--post-snapshot-cmd 'pkill -F /jails/mysqljail1/tmp/mysql_lock.pid' \
--post-snapshot-cmd 'pkill -F /jails/mysqljail2/tmp/mysql_lock.pid' \
test
```
## Thinning out obsolete snapshots
The thinner is the thing that destroys old snapshots on the source and target.
@ -430,6 +417,25 @@ zfs send -> send buffer -> custom send pipes -> compression -> transfer rate lim
#### On the receiving side:
decompression -> custom recv pipes -> buffer -> zfs recv
## Running custom commands before and after snapshotting
If you need, e.g. to quiesce a couple of mysql databases to make on-disk data consistent before snapshotting, you can use the `--pre-snapshot-cmd` and `--post-snapshot-cmd` options.
For example:
```sh
zfs-autobackup \
--pre-snapshot-cmd 'daemon -f jexec mysqljail1 mysql -s -e "set autocommit=0;flush logs;flush tables with read lock;\\! echo \$\$ > /tmp/mysql_lock.pid && sleep 60"' \
--pre-snapshot-cmd 'daemon -f jexec mysqljail2 mysql -s -e "set autocommit=0;flush logs;flush tables with read lock;\\! echo \$\$ > /tmp/mysql_lock.pid && sleep 60"' \
--post-snapshot-cmd 'pkill -F /jails/mysqljail1/tmp/mysql_lock.pid' \
--post-snapshot-cmd 'pkill -F /jails/mysqljail2/tmp/mysql_lock.pid' \
backupfs1
```
The post-snapshot commands are ALWAYS executed, even if a pre-snapshot command or the actual snapshot fail.
A failure of a post-snapshot command is non-fatal and will be ignored. The remaining post-snapshot commands wont be executed in that case.
## Tips
* Use ```--debug``` if something goes wrong and you want to see the commands that are executed. This will also stop at the first error.