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https://github.com/zrepl/zrepl.git
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b2c6e51a43
This was merged to master prematurely as the job components are not decoupled well enough
for these signals to be useful yet.
This reverts commit 2c8c2cfa14.
closes #452
80 lines
2.8 KiB
ReStructuredText
80 lines
2.8 KiB
ReStructuredText
.. _usage:
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*****
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Usage
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*****
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============
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CLI Overview
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============
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.. NOTE::
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The zrepl binary is self-documenting:
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run ``zrepl help`` for an overview of the available subcommands or ``zrepl SUBCOMMAND --help`` for information on available flags, etc.
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.. _cli-signal-wakeup:
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.. list-table::
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:widths: 30 70
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:header-rows: 1
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* - Subcommand
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- Description
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* - ``zrepl help``
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- show subcommand overview
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* - ``zrepl daemon``
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- run the daemon, required for all zrepl functionality
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* - ``zrepl status``
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- show job activity, or with ``--raw`` for JSON output
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* - ``zrepl stdinserver``
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- see :ref:`transport-ssh+stdinserver`
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* - ``zrepl signal wakeup JOB``
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- manually trigger replication + pruning of JOB
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* - ``zrepl signal reset JOB``
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- manually abort current replication + pruning of JOB
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* - ``zrepl configcheck``
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- check if config can be parsed without errors
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* - ``zrepl migrate``
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- | perform on-disk state / ZFS property migrations
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| (see :ref:`changelog <changelog>` for details)
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* - ``zrepl zfs-abstraction``
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- list and remove zrepl's abstractions on top of ZFS, e.g. holds and step bookmarks (see :ref:`overview <replication-cursor-and-last-received-hold>` )
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.. _usage-zrepl-daemon:
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============
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zrepl daemon
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============
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All actual work zrepl does is performed by a daemon process.
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The daemon supports structured :ref:`logging <logging>` and provides :ref:`monitoring endpoints <monitoring>`.
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When installing from a package, the package maintainer should have provided an init script / systemd.service file.
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You should thus be able to start zrepl daemon using your init system.
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Alternatively, or for running zrepl in the foreground, simply execute ``zrepl daemon``.
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Note that you won't see much output with the :ref:`default logging configuration<logging-default-config>`:
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.. ATTENTION::
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Make sure to actually monitor the error level output of zrepl: some configuration errors will not make the daemon exit.
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Example: if the daemon cannot create the :ref:`transport-ssh+stdinserver` sockets in the runtime directory,
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it will emit an error message but not exit because other tasks such as periodic snapshots & pruning are of equal importance.
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.. _usage-zrepl-daemon-restarting:
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Restarting
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~~~~~~~~~~
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The daemon handles SIGINT and SIGTERM for graceful shutdown.
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Graceful shutdown means at worst that a job will not be rescheduled for the next interval.
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The daemon exits as soon as all jobs have reported shut down.
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Systemd Unit File
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~~~~~~~~~~~~~~~~~
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A systemd service definition template is available in :repomasterlink:`dist/systemd`.
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Note that some of the options only work on recent versions of systemd.
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Any help & improvements are very welcome, see :issue:`145`. |