amzfs-snapshot (8) - Linux Manuals

amzfs-snapshot: Amanda script to create zfs snapshot

NAME

amzfs-snapshot - Amanda script to create zfs snapshot

DESCRIPTION

amzfs-snapshot is an Amanda script implementing the Script API. It should not be run by users directly. It create a zfs snapshot of the filesystem where the path specified is mounted.

PRE-DLE-* create a snapshot and the POST-DLE-* destroy the snapshot, *-DLE-AMCHECK, *-DLE-ESTIMATE and *-DLE-BACKUP must be set to be executed on the client:

    execute-on  pre-dle-amcheck, post-dle-amcheck, pre-dle-estimate, post-dle-estimate, pre-dle-backup, post-dle-backup
    execute-where client

The PRE_DLE_* script output a DIRECTORY property telling where the directory is located in the snapshot. The application must be able to use the DIRECTORY property, amgtar can do it.

The script is run as the amanda user, it must have the priviledge to create and destroy snapshot:

    zfs allow -ldu AMANDA_USER mount,snapshot,destroy FILESYSTEM

Some system doesn't have "zfs allow", but you can give the Amanda backup user the rights to manipulate ZFS filesystems by using the following command:

usermod -P "ZFS File System Management,ZFS Storage Management" AMANDA_USER

This will require that your run zfs under pfexec, set the PFEXEC property to YES.

The format of the DLE must be one of:

Desciption              Example
----------              -------
Mountpoint              /data
Arbitrary mounted dir   /data/interesting_dir
ZFS pool name           datapool
ZFS filesystem          datapool/database
ZFS logical volume      datapool/dbvol

The filesystem must be mounted.

PROPERTIES

This section lists the properties that control amzfs-snapshot's functionality. See amanda-scripts(7) for information on the Script API, script configuration.

DF-PATH

Path to the 'df' binary, search in $PATH by default.

ZFS-PATH

Path to the 'zfs' binary, search in $PATH by default.

PFEXEC-PATH

Path to the 'pfexec' binary, search in $PATH by default.

PFEXEC

If "NO" (the default), pfexec is not used, if set to "YES" then pfexec is used.

EXAMPLE

In this example, a dumptype is defined to use amzfs-snapshot script to create a snapshot and use amgtar to backup the snapshot.

 define script-tool amzfs_snapshot {
   comment "backup of zfs snapshot"
   plugin  "amzfs-snapshot"
   execute-on  pre-dle-amcheck, post-dle-amcheck, pre-dle-estimate, post-dle-estimate, pre-dle-backup, post-dle-backup
   execute-where client
   #property "DF-PATH" "/usr/sbin/df"
   #property "ZFS-PATH" "/usr/sbin/zfs"
   #property "PFEXEC-PATH" "/usr/sbin/pfexec"
   #property "PFEXEC" "NO"
 }

 define dumptype user-zfs-amgtar {
   dt_amgtar
   script "amzfs_snapshot"
 }

AUTHORS

Jean-Louis Martineau <martineau [at] zmanda.com>

Zmanda, Inc. (http://www.zmanda.com)

Dustin J. Mitchell <dustin [at] zmanda.com>

Zmanda, Inc. (http://www.zmanda.com)