SystemD

Konfiguration

/etc/systemd/journald.conf

Storage=persistent
SystemMaxFileSize=50M

• systemctl restart systemd-journald.service

Kommandos

systemctl

systemctl start nginx.service | stop | status | restart | reload
systemctl enable nginx.service | disable

systemctl list-units # laufende Services
systemctl list-unit-files # verfügbare Services
systemctl --failed # missglückte Starts

systemctl mask nginx.service # Als nicht startbar markieren
systemctl unmask nginx.service # mask aufheben

systemctl list-units --type=target
systemctl isolate graphical.target | rescue.target | multi-user.target 
systemctl set-default multi-user.target

systemd-analyze
systemd-analyze blame # Startzeiten der Services

journalctl

journalctl --since yesterday | --since "2016-03-16 02:00:00" | --since 09:00 --until "1 hour ago"
journalctl --list-boots
journalctl -b -1 # since last boot (relative pointer -1)
journalctl -u nginx.service -u php-fpm.service # by units
journalctl -k # kernel messages
journalctl --no-full # truncated info
journalctl -a # all info
journalctl -n 20 # only the last 20 lines
journalctl -f # like tail -f

journalctl --disk-usage # wie viel braucht das journal
journalctl --vacuum-size=1G # Platz auf 1 GByte reduzieren

Beispiel Service Definitionsdatei

• /lib/systemd/system/redis.service

[Unit]
Description=Redis persistent key-value database
After=network.target

[Service]
ExecStart=/usr/local/bin/redis-server
ExecStop=/usr/local/bin/redis-shutdown
WorkingDirectory=/var/lib/redis
User=redis
Group=redis

[Install]
WantedBy=multi-user.target