157 lines
7.1 KiB
Plaintext
157 lines
7.1 KiB
Plaintext
# Koha systemd units
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This package supervises every Koha daemon with native systemd units. It is
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one of the two providers of the `koha-init` virtual package that koha-common
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depends on; the other is koha-sysv (the traditional /etc/init.d/koha-common
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script). The two conflict with each other and installing one replaces the
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other. koha-common prefers koha-systemd wherever systemd is installable, so
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containers that want the init script must install koha-sysv explicitly.
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## Units
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Per instance (`INSTANCE` is the koha-create name, e.g. `library`):
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- `koha-plack@INSTANCE.service` Plack/Starman web application
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- `koha-zebra@INSTANCE.service` Zebra search server
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- `koha-indexer@INSTANCE.service` Zebra indexing daemon
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- `koha-es-indexer@INSTANCE.service` Elasticsearch indexing daemon
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- `koha-worker@INSTANCE.service` background jobs, `default` queue
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- `koha-worker-long_tasks@INSTANCE.service` background jobs, `long_tasks` queue
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- `koha-sip@INSTANCE.service` SIP2 server
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- `koha-z3950@INSTANCE.service` Z39.50/SRU server
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- `koha-create-dirs@INSTANCE.service` oneshot that creates the run,
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lock and cache directories the
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others depend on
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- `koha@INSTANCE.target` groups the instance's units
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Host wide:
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- `koha.target` groups every `koha@INSTANCE.target`; enabled at boot
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- `koha-common.service` compatibility shim so that
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`systemctl start|stop|restart koha-common` (the old
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`service koha-common ...`) keeps working. It has no
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state of its own: `systemctl status koha.target`, or
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`koha-systemd-ctl status INSTANCE`, is the real
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health check.
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## Day-to-day use
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The koha-* helpers work as before and drive systemd underneath:
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koha-plack --restart library # systemctl restart koha-plack@library
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koha-zebra --stop library
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koha-worker --all-queues --status library
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Each helper also has `--enable` and `--disable`, which control whether the
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unit is started at boot (with koha-sysv these are no-ops). Or use systemctl
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directly:
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systemctl restart koha@library.target # one instance, all daemons
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systemctl restart koha-common # every instance
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systemctl status koha-plack@library.service
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koha-systemd-ctl status library # all units of one instance
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koha-create enables and starts the units of a new instance. koha-disable
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stops an instance and disables its `koha@INSTANCE.target`, koha-enable
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turns it back on and starts it, and koha-remove disables everything it
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created.
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Which units are enabled follows the instance's configuration:
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- Plack: `koha-plack --enable INSTANCE` (also edits the Apache vhost)
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- SIP: `koha-sip --enable INSTANCE`. The SysV-era flag file
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/var/lib/koha/INSTANCE/sip.enabled is not consulted on systemd hosts;
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`systemctl is-enabled koha-sip@INSTANCE` is the source of truth.
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- Z39.50/SRU: `koha-z3950-responder --enable INSTANCE`
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- Zebra indexer: enabled when USE_INDEXER_DAEMON=yes in
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/etc/default/koha-common (the default)
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- Elasticsearch indexer: `koha-es-indexer --enable INSTANCE`. Switching the
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SearchEngine system preference does not enable anything by itself;
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`systemctl restart koha-common` (or `koha-systemd-ctl sync-es-indexers`)
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discovers instances that now use Elasticsearch and enables their indexer,
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like the init script did on every start.
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## Configuration
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The units read the same settings as the init script:
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- /etc/koha/sites/INSTANCE/koha-conf.xml: plack_workers,
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plack_max_requests, debug_mode, zebra_loglevels, zebra_max_record_size,
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es_indexer_batch_size, and z3950_responder_options in the Z39.50
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config.xml
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- /etc/default/koha-common: INDEXER_TIMEOUT, ALTERNATE_INDEXER_DAEMON,
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INDEXER_PARAMS, Z3950_ADDITIONAL_OPTS
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They are re-read on every start by koha-generate-env, which writes them to
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/run/koha/INSTANCE/SERVICE.env for the unit's EnvironmentFile=. Restart the
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unit after changing them.
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## Logging
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Log locations are the same with either init package. With koha-sysv the
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daemon(1) wrapper captures each daemon's standard output and error to
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/var/log/koha/INSTANCE/NAME-output.log and NAME-error.log; the systemd
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units do the same through StandardOutput=append: and StandardError=append:,
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so zebra-*.log, indexer-*.log, es-indexer-*.log, worker-*.log and
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sip-*.log keep being written where they always were and the shipped
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logrotate configuration keeps rotating them. Everything Koha writes itself
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is unaffected either way:
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plack.log, plack-error.log (Starman --access-log/--error-log)
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plack-opac-error.log, plack-intranet-error.log, plack-api-error.log,
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api-error.log, sip-output.log, z3950-error.log, editrace.log
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(log4perl)
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z3950.log (z3950_responder.pl -l)
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opac-error.log, intranet-error.log, opac-access.log, ...
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(Apache, per vhost)
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The journal therefore only holds what systemd itself records about a unit
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(starts, stops, failures, restart-limit hits), which is where to look when
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a unit refuses to start:
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journalctl -u koha-zebra@library.service
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journalctl -u 'koha-*@library.service' # everything for one instance
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If you would rather have a daemon's output in the journal, override the two
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directives with a drop-in:
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systemctl edit koha-worker@library.service
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[Service]
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StandardOutput=journal
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StandardError=journal
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## Sandboxing
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The daemon units run with ProtectSystem=full, ProtectHome=yes,
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PrivateTmp=yes and NoNewPrivileges=yes. This is fine for instances created
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by koha-create, which keep everything under /var/lib/koha/INSTANCE,
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/var/cache/koha/INSTANCE and /var/log/koha/INSTANCE. It matters if:
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- koha-conf.xml has an empty <tmp_path> (instances created before that
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option existed): Koha then falls back to /tmp, which is private to each
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unit, so file-based sessions do not survive a Plack restart and are not
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shared with CGI, and uploads staged by Plack are invisible to the worker.
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Set <tmp_path>/var/lib/koha/INSTANCE/tmp</tmp_path> (and create it) as
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koha-create does today.
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- --upload-path, --tmp-path or a plugin directory point under /home
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(ProtectHome) or anywhere outside the instance directories (ProtectSystem
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makes /usr, /boot and /etc read-only).
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- a plugin shells out to a setuid helper such as sudo (NoNewPrivileges).
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Relax a setting for one unit with a drop-in rather than editing the
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packaged file:
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systemctl edit koha-plack@library.service
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[Service]
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PrivateTmp=no
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ReadWritePaths=/srv/koha-uploads
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## Migration from koha-sysv / the old koha-common
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Installing koha-systemd (which happens automatically when upgrading
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koha-common from a pre-split release on a systemd host) stops the daemons
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the init script started, enables the units matching each enabled
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instance's configuration, and starts koha.target. No manual step is
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needed. To go back, `apt install koha-sysv`: koha-systemd is removed, its
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prerm stops the units, and the init script takes over on the next start.
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