mirror of
https://github.com/zrepl/zrepl.git
synced 2024-12-23 15:38:49 +01:00
188 lines
6.0 KiB
ReStructuredText
188 lines
6.0 KiB
ReStructuredText
.. include:: ../global.rst.inc
|
|
|
|
.. |patient| replace:: :ref:`patient <job-term-patient>`
|
|
.. |serve-transport| replace:: :ref:`serve transport<transport-ssh+stdinserver-serve>`
|
|
.. |connect-transport| replace:: :ref:`connect transport<transport-ssh+stdinserver-connect>`
|
|
.. |mapping| replace:: :ref:`mapping <pattern-mapping>`
|
|
.. |filter| replace:: :ref:`filter <pattern-filter>`
|
|
.. |prune| replace:: :ref:`prune <prune>`
|
|
|
|
.. _job:
|
|
|
|
Job Types
|
|
=========
|
|
|
|
A *job* is the unit of activity tracked by the zrepl daemon and configured in the |mainconfig|.
|
|
Every job has a unique ``name``, a ``type`` and type-dependent fields which are documented on this page.
|
|
Check out the :ref:`tutorial` and :sampleconf:`/` for examples on how job types are actually used.
|
|
|
|
.. ATTENTION::
|
|
|
|
Currently, zrepl does not replicate filesystem properties.
|
|
Whe receiving a filesystem, it is never mounted (`-u` flag) and `mountpoint=none` is set.
|
|
This is temporary and being worked on :issue:`24`.
|
|
|
|
.. _job-source:
|
|
|
|
Source Job
|
|
----------
|
|
|
|
Example: :sampleconf:`pullbackup/productionhost.yml`.
|
|
|
|
.. list-table::
|
|
:widths: 20 80
|
|
:header-rows: 1
|
|
|
|
* - Parameter
|
|
- Comment
|
|
* - ``type``
|
|
- = ``source``
|
|
* - ``name``
|
|
- unique name of the job
|
|
* - ``serve``
|
|
- |serve-transport|
|
|
* - ``filesystems``
|
|
- |filter| for filesystems to expose to client
|
|
* - ``snapshot_prefix``
|
|
- prefix for ZFS snapshots taken by this job
|
|
* - ``interval``
|
|
- snapshotting interval
|
|
* - ``prune``
|
|
- |prune| for versions of filesytems in ``filesystems``, versions prefixed with ``snapshot_prefix``
|
|
|
|
|
|
- Snapshotting Task (every ``interval``, |patient|)
|
|
|
|
- A snapshot of filesystems matched by ``filesystems`` is taken every ``interval`` with prefix ``snapshot_prefix``.
|
|
- A bookmark of that snapshot is created with the same name.
|
|
- The ``prune`` policy is evaluated for versions of filesystems matched by ``filesystems``, versions prefixed with ``snapshot_prefix``.
|
|
|
|
- Serve Task
|
|
|
|
- Wait for connections from pull job using ``serve``.
|
|
|
|
A source job is the counterpart to a :ref:`job-pull`.
|
|
|
|
Make sure you read the |prune| policy documentation.
|
|
|
|
.. _job-pull:
|
|
|
|
Pull Job
|
|
--------
|
|
|
|
Example: :sampleconf:`pullbackup/backuphost.yml`
|
|
|
|
.. list-table::
|
|
:widths: 20 80
|
|
:header-rows: 1
|
|
|
|
* - Parameter
|
|
- Comment
|
|
* - ``type``
|
|
- = ``pull``
|
|
* - ``name``
|
|
- unqiue name of the job
|
|
* - ``connect``
|
|
- |connect-transport|
|
|
* - ``interval``
|
|
- Interval between pull attempts
|
|
* - ``mapping``
|
|
- |mapping| for remote to local filesystems
|
|
* - ``initial_repl_policy``
|
|
- default = ``most_recent``, initial replication policy
|
|
* - ``snapshot_prefix``
|
|
- prefix snapshots must match to be considered for replication & pruning
|
|
* - ``prune``
|
|
- |prune| policy for versions of filesystems of local filesystems reachable by ``mapping``, versions prefixed with ``snapshot_prefix``
|
|
|
|
* Main Task (every ``interval``, |patient|)
|
|
|
|
#. A connection to the remote source job is established using the strategy in ``connect``
|
|
#. ``mapping`` maps filesystems presented by the remote side to local *target filesystems*
|
|
#. Those remote filesystems with a local *target filesystem* are replicated
|
|
|
|
#. Only snapshots with prefix ``snapshot_prefix`` are replicated.
|
|
#. If possible, incremental replication takes place.
|
|
#. If the local target filesystem does not exist, ``initial_repl_policy`` is used.
|
|
#. On conflicts, an error is logged but replication of other filesystems with mapping continues.
|
|
|
|
#. The ``prune`` policy is evaluated for all *target filesystems*
|
|
|
|
A pull job is the counterpart to a :ref:`job-source`.
|
|
|
|
Make sure you read the |prune| policy documentation.
|
|
|
|
.. _job-local:
|
|
|
|
Local Job
|
|
---------
|
|
|
|
Example: :sampleconf:`localbackup/host1.yml`
|
|
|
|
.. list-table::
|
|
:widths: 20 80
|
|
:header-rows: 1
|
|
|
|
* - Parameter
|
|
- Comment
|
|
* - ``type``
|
|
- = ``local``
|
|
* - ``name``
|
|
- unqiue name of the job
|
|
* - ``mapping``
|
|
- |mapping| from source to target filesystem (both local)
|
|
* - ``snapshot_prefix``
|
|
- prefix for ZFS snapshots taken by this job
|
|
* - ``interval``
|
|
- snapshotting & replication interval
|
|
* - ``initial_repl_policy``
|
|
- default = ``most_recent``, initial replication policy
|
|
* - ``prune_lhs``
|
|
- pruning policy on left-hand-side (source)
|
|
* - ``prune_rhs``
|
|
- pruning policy on right-hand-side (target)
|
|
|
|
* Main Task (every ``interval``, |patient|)
|
|
|
|
#. Evaluate ``mapping`` for local filesystems, those with a *target filesystem* are called *mapped filesystems*.
|
|
#. Snapshot *mapped filesystems* with ``snapshot_prefix``.
|
|
#. Bookmark the snapshot created above.
|
|
#. Replicate *mapped filesystems* to their respective *target filesystems*:
|
|
|
|
#. Only snapshots with prefix ``snapshot_prefix`` are replicated.
|
|
#. If possible, incremental replication takes place.
|
|
#. If the *target filesystem* does not exist, ``initial_repl_policy`` is used.
|
|
#. On conflicts, an error is logged but replication of other *mapped filesystems* continues.
|
|
|
|
#. The ``prune_lhs`` policy is triggered for all *mapped filesystems*
|
|
#. The ``prune_rhs`` policy is triggered for all *target filesystems*
|
|
|
|
A local job is combination of source & pull job executed on the same machine.
|
|
|
|
Terminology
|
|
-----------
|
|
|
|
task
|
|
|
|
A job consists of one or more tasks and a task consists of one or more steps.
|
|
Some tasks may be periodic while others wait for an event to occur.
|
|
|
|
|
|
patient task
|
|
|
|
.. _job-term-patient:
|
|
|
|
A patient task is supposed to execute some task every `interval`.
|
|
We call the start of the task an *invocation*.
|
|
|
|
* If the task completes in less than `interval`, the task is restarted at `last_invocation + interval`.
|
|
* Otherwise, a patient job
|
|
* logs a warning as soon as a task exceeds its configured `interval`
|
|
* waits for the last invocation to finish
|
|
* logs a warning with the effective task duration
|
|
* immediately starts a new invocation of the task
|
|
|
|
filesystem version
|
|
|
|
A snapshot or a bookmark.
|