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tech:systemd_service_-_exemples

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 +<!DOCTYPE markdown>
 +{{tag>SystemD Services}}
 +
 +# SystemD service - exemples
 +
 +Voir aussi :
 +* [[SystemD service script en boucle infinie respawn]]
 +* [[Notes Etherpad|Etherpad Démarrage automatique avec SystemD]]
 +* [[RedHat accès /var/log/mariadb/mariadb.log sans être root]]
 +* [[pb_podman_-_podman_system_migrate|Pb podman - podman system migrate - script_palliatif]]
 +* [Les différents types de service SystemD](https://unix.stackexchange.com/questions/736189/difference-between-ubuntu-systemd-simpleoneshot-and-forking)
 +
 +Voir :
 +* [[Notes Linux capabilities sécurité caps capsh setcap]]
 +
 +
 +## Diagnostic d'un service
 +
 +Source : [[https://wiki.archlinux.org/title/Systemd_(Fran%C3%A7ais)#Diagnostic_d'un_service]]
 +
 +Si un service systemd se comporte mal ou si vous souhaitez obtenir plus d'informations sur ce qui se passe, définissez la SYSTEMD_LOG_LEVEL {[variable d'environnement]] à SYSTEMD_LOG_LEVEL. [à debug. Par exemple, pour exécuter le daemon systemd-networkd en mode débogage :
 +
 +Ajoutez un [Fichiers de substitution](https://wiki.archlinux.org/title/Systemd_(Fran%C3%A7ais)#Fichiers_de_substitution) pour le service en ajoutant les deux lignes :
 +
 +~~~ini
 +[Service]
 +Environment=SYSTEMD_LOG_LEVEL=debug
 +~~~
 +
 +Ou comme équivalent, définissez la variable d'environnement manuellement :
 +~~~
 +# SYSTEMD_LOG_LEVEL=debug /lib/systemd/systemd-networkd
 +~~~
 +
 +puis redémarrer systemd-networkd et regarder le journal du service avec l'option -f/--follow. 
 +
 +## Exemple conf
 +
 +
 +### Exemple conf proxy
 +
 +
 +`/etc/systemd/system/docker.service.d/http-proxy.conf`
 +~~~ini
 +[Service]
 +# Environment="HTTP_PROXY=http://192.168.56.1:3128/" "HTTPS_PROXY=http://192.168.56.1:3128/" "NO_PROXY=localhost,127.0.0.0/8,192.168.0.0/16,docker-1"
 +Environment="ALL_PROXY=http://192.168.56.1:3128/" "NO_PROXY=localhost,127.0.0.0/8,192.168.0.0/16,docker-1"
 +
 +~~~
 +
 +~~~bash
 +systemctl daemon-reload
 +systemctl show --property=Environment docker
 +systemctl restart docker
 +~~~
 +
 +
 +### Désactiver un service si un fichier est présent
 +
 +`/lib/systemd/system/systemd-timesyncd.service.d/disable-with-time-daemon.conf`
 +~~~ini
 +[Unit]
 +# don't run timesyncd if we have another NTP daemon installed
 +#ConditionFileIsExecutable=!/usr/sbin/VBoxService
 +~~~
 +
 +
 +### Arguments utiles
 +
 +~~~ini
 +Environment=NODE_ENV=production
 +~~~
 +
 +
 +
 +### Command systemd-run
 +
 +https://blog.octo.com/5-services-que-systemd-ma-deja-rendu/
 +~~~bash
 +#systemd-run --user
 +systemd-run --on-active=10 /bin/bash -c "echo 'Bip!' >>'/var/log/spoutnik.log'
 +~~~
 +
 +https://wiki.archlinux.org/index.php/Systemd/Timers
 +~~~bash
 +systemd-run --on-active="12h 30m" --unit someunit.service
 +~~~
 +
 +https://www.systutorials.com/docs/linux/man/1-systemd-run/
 +~~~bash
 +systemd-run -p BlockIOWeight=10 updatedb
 +systemd-run --on-active=30 --timer-property=AccuracySec=100ms /bin/touch /tmp/foo
 +~~~
 +
 +
 +## Exemple
 +
 +### Exemple 1
 +
 +Source : https://confluence.atlassian.com/confkb/run-confluence-as-a-systemd-service-on-linux-937177781.html
 +
 +~~~bash
 +touch /lib/systemd/system/confluence.service
 +chmod 664 /lib/systemd/system/confluence.service
 +~~~
 +
 +~~~bash
 +vi /lib/systemd/system/confluence.service
 +~~~
 +
 +
 +`/lib/systemd/system/confluence.service`
 +~~~ini
 +[Unit]
 +Description=Confluence
 +After=network.target
 +
 +[Service]
 +Type=forking
 +User=confluence
 +PIDFile=/opt/atlassian/confluence/work/catalina.pid
 +ExecStart=/opt/atlassian/confluence/bin/start-confluence.sh
 +ExecStop=/opt/atlassian/confluence/bin/stop-confluence.sh
 +TimeoutSec=200
 +LimitNOFILE=2048
 +LimitNPROC=2048
 +
 +[Install]
 +WantedBy=multi-user.target
 +~~~
 +
 +Vérif syntax
 +
 +~~~bash
 +systemd-analyze verify /lib/systemd/system/confluence.service
 +~~~
 +
 +~~~bash
 +systemctl daemon-reload
 +systemctl enable confluence.service
 +systemctl start confluence.service
 +systemctl status confluence.service
 +~~~
 +
 +
 +### Exemple 2
 +
 +https://wiki.archlinux.org/index.php/Advanced_Format
 +
 +`/etc/systemd/system/lcc_fix.service`
 +~~~ini
 +[Unit]
 +Description=WDIDLE3
 +
 +[Service]
 +Type=oneshot
 +ExecStart=/usr/bin/hdparm -J 300 --please-destroy-my-drive /dev/sdX
 +TimeoutSec=0
 +StandardInput=tty
 +RemainAfterExit=yes
 +UMask=006
 +
 +[Install]
 +WantedBy=multi-user.target
 +~~~
 +
 +
 +### Exemple 3
 +
 +Source : https://fabianlee.org/2017/05/21/golang-running-a-go-binary-as-a-systemd-service-on-ubuntu-16-04/
 +
 +`/lib/systemd/system/sleepservice.service`
 +~~~ini
 +[Unit]
 +Description=Sleep service
 +ConditionPathExists=/home/ubuntu/work/src/sleepservice/sleepservice
 +After=network.target
 + 
 +[Service]
 +Type=simple
 +User=sleepservice
 +Group=sleepservice
 +LimitNOFILE=1024
 +
 +Restart=on-failure
 +RestartSec=10
 +startLimitIntervalSec=60
 +
 +WorkingDirectory=/home/ubuntu/work/src/sleepservice
 +ExecStart=/home/ubuntu/work/src/sleepservice/sleepservice --name=foo
 +
 +# make sure log directory exists and owned by syslog
 +PermissionsStartOnly=true
 +ExecStartPre=/bin/mkdir -p /var/log/sleepservice
 +ExecStartPre=/bin/chown syslog:adm /var/log/sleepservice
 +ExecStartPre=/bin/chmod 755 /var/log/sleepservice
 +StandardOutput=syslog
 +StandardError=syslog
 +SyslogIdentifier=sleepservice
 + 
 +[Install]
 +WantedBy=multi-user.target
 +~~~
 +
 +### Exemple 4 - SystemD appelant un script sysV init
 +
 +Exemple avec SonarQube
 +
 +`/etc/systemd/system/sonar.service`
 +~~~ini
 +[Unit]
 +Description=Sonar 6
 +After=network.target network-online.target
 +Wants=network-online.target
 +
 +[Service]
 +ExecStart=/home/sonar/sonarqube-6.7.1/bin/linux-x86-64/sonar.sh start
 +ExecStop=/home/sonar/sonarqube-6.7.1/bin/linux-x86-64/sonar.sh stop
 +ExecReload=/home/sonar/sonarqube-6.7.1/bin/linux-x86-64/sonar.sh restart
 +PIDFile=/home/sonar/sonarqube-6.7.1/bin/linux-x86-64/./SonarQube.pid
 +Type=forking
 +User=sonar
 +
 +[Install]
 +WantedBy=multi-user.target
 +~~~
 +
 +
 +### Exemple Jenkins slave agent
 +
 +
 +`Jenkins-agent.service`
 +~~~ini
 +[Unit]
 +Description=Jenkins Service
 +Wants=network.target
 +After=network.target
 +
 +[Service]
 +ExecStart=/usr/bin/java -jar /home/user1/slave2.jar -jnlpUrl http://jenkins:8080/computer/SERVER01/slave-agent.jnlp
 +User=user1
 +Restart=always
 +
 +[Install]
 +WantedBy=multi-user.target
 +~~~
 +
 +
 +### Exemple Postgres
 +
 +`/usr/local/lib/systemd/system/postgres_plop_rct.service`
 +~~~ini
 +[Unit]
 +Description=postgresql_plop_rct_service
 +After=network.target
 +AssertPathExists=!/etc/noprod
 +
 +[Service]
 +Type=forking
 +User=postgres
 +
 +#Disable OOM kill on postmaster
 +OOMScoreAdjust=-1000
 +Environment=PG_OOM_ADJUST_FILE=/proc/self/oom_score_adj
 +Environment=PG_OOM_ADJUST_VALUE=0
 +
 +WorkingDirectory=/tools/list/postgres/script/bin
 +ExecStart=/tools/list/postgres/script/bin/rc_postgres.ksh start plop_rct
 +ExecStop=/tools/list/postgres/script/bin/rc_postgres.ksh stop plop_rct
 +ExecReload=/bin/kill -HUP $MAINPID
 +Restart=on-abort
 +KillMode=mixed
 +KillSignal=SIGINT
 +TimeoutSec=0
 +
 +[Install]
 +WantedBy=multi-user.target
 +~~~
 +
 +
 +### Exemple AAP - Tirer des dépendances seulement
 +
 +
 +`/etc/systemd/system/automation-controller.service`
 +~~~ini
 +[Unit]
 +Description=Automation Controller service
 +After=network.target redis.service  nginx.service supervisord.service receptor.service
 +Wants=redis.service  nginx.service supervisord.service receptor.service
 +
 +[Service]
 +Type=oneshot
 +RemainAfterExit=true
 +ExecStart=/bin/true
 +
 +[Install]
 +WantedBy=multi-user.target
 +~~~
 +
 +
 +### Exemple iptables-service de RedHat
 +
 +`/usr/lib/systemd/system/iptables.service`
 +~~~ini
 +[Unit]
 +Description=IPv4 firewall with iptables
 +After=syslog.target
 +AssertPathExists=/etc/sysconfig/iptables
 +
 +[Service]
 +Type=oneshot
 +RemainAfterExit=yes
 +ExecStart=/usr/libexec/iptables/iptables.init start
 +ExecReload=/usr/libexec/iptables/iptables.init reload
 +ExecStop=/usr/libexec/iptables/iptables.init stop
 +Environment=BOOTUP=serial
 +Environment=CONSOLETYPE=serial
 +StandardOutput=syslog
 +StandardError=syslog
 +
 +[Install]
 +WantedBy=basic.target
 +~~~
 +
 +
 +`/usr/libexec/iptables/iptables.init`
 +~~~bash
 +#!/bin/bash
 +#
 +# iptables      Start iptables firewall
 +#
 +# chkconfig: 2345 08 92
 +# description:  Starts, stops and saves iptables firewall
 +#
 +# config: /etc/sysconfig/iptables
 +# config: /etc/sysconfig/iptables-config
 +#
 +### BEGIN INIT INFO
 +# Provides: iptables
 +# Required-Start:
 +# Required-Stop:
 +# Default-Start: 2 3 4 5
 +# Default-Stop: 0 1 6
 +# Short-Description: start and stop iptables firewall
 +# Description: Start, stop and save iptables firewall
 +### END INIT INFO
 +
 +# Source function library.
 +. /etc/init.d/functions
 +
 +#------------------------------------------------
 +
 +case "$1" in
 +    start)
 +        [ -f "$VAR_SUBSYS_IPTABLES" ] && exit 0
 +        start
 +        RETVAL=$?
 +        ;;
 +    stop)
 +        [ "x$IPTABLES_SAVE_ON_STOP" = "xyes" ] && save
 +        stop
 +        RETVAL=$?
 +        ;;
 +    restart|force-reload)
 +        restart
 +        RETVAL=$?
 +        ;;
 +    reload)
 +        [ -e "$VAR_SUBSYS_IPTABLES" ] && reload
 +        RETVAL=$?
 +        ;;
 +    condrestart|try-restart)
 +        [ ! -e "$VAR_SUBSYS_IPTABLES" ] && exit 0
 +        restart
 +        restart
 +        RETVAL=$?
 +        ;;
 +    status)
 +        status
 +        RETVAL=$?
 +        ;;
 +    panic)
 +        set_policy DROP
 +        RETVAL=$?
 +        ;;
 +    save)
 +        save
 +        RETVAL=$?
 +        ;;
 +    *)
 +        echo $"Usage: ${IPTABLES} {start|stop|reload|restart|condrestart|status|panic|save}"
 +        RETVAL=2
 +        ;;
 +esac
 +
 +exit $RETVAL
 +~~~
 +
 +
 +### Exemple Nagios
 +
 +`nagios4.service`
 +~~~ini
 +[Unit]
 +Description=nagios4
 +Documentation=man:nagios4
 +
 +[Service]
 +Environment=NAGIOSCFG="/etc/nagios4/nagios.cfg"
 +EnvironmentFile=/etc/default/nagios4
 +ExecStartPre=sh -c 'nagiospipe=$$(sed -n "s/^command_file=\\(.*\\)/\\1/p" ${NAGIOSCFG}); [ -z "$${nagiospipe}" -o ! -e "$${nagiospipe}" ] || rm -f "$${nagiospipe}"'
 +ExecStart=/usr/sbin/nagios4 ${NAGIOSCFG}
 +ExecStopPost=sh -c 'nagiospipe=$$(sed -n "s/^command_file=\\(.*\\)/\\1/p" ${NAGIOSCFG}); [ -z "$${nagiospipe}" -o ! -e "$${nagiospipe}" ] || rm -f "$${nagiospipe}"'
 +ExecReload=/bin/kill -HUP $MAINPID
 +KillMode=mixed
 +PIDFile=/run/nagios4/nagios.pid
 +
 +[Install]
 +WantedBy=multi-user.target
 +~~~
 +
 +
 +### Exemple Podman
 +
 +`/etc/systemd/user/podman.service`
 +~~~ini
 +[Unit]
 +Description=Podman API Service
 +Requires=podman.socket
 +After=podman.socket
 +Documentation=man:podman-system-service(1)
 +StartLimitIntervalSec=0
 +
 +[Service]
 +Type=exec
 +KillMode=process
 +Environment=LOGGING="--log-level=info"
 +ExecStart=/usr/bin/podman $LOGGING system service --time=1800
 +
 +[Install]
 +WantedBy=multi-user.target
 +~~~
 +
 +~~~bash
 +systemctl --user daemon-reload
 +systemctl restart --user podman.socket
 +~~~
 +
 +Source : https://buildpacks.io/docs/for-app-developers/how-to/special-cases/build-on-podman/
 +
  
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