Priklad: chceme zmenit hodnotu Nice pro sluzbu zabbix-agent.service
Vychozi je /lib/systemd/system/zabbix-agent.service, na ten nesahame, protoze by nam ho prepsalo apt pri aktualizaci.
Vyvorime adresar a soubor s nastavenim:
mkdir -p /etc/systemd/system/zabbix-agent.service.d
touch /etc/systemd/system/zabbix-agent.service.d/10-custom-nice.conf
Syntaxe je JMENO.service.d, tedy zabbix-agent.service.d.
do souboru /etc/systemd/system/zabbix-agent.service.d/10-custom-nice.conf dame:
[Service]
Nice=-4
a pote:
systemctl daemon-reload
systemctl restart zabbix-agent.service
a uz to funguje :-)
root@server:/# systemctl status zabbix-agent.service
● zabbix-agent.service - Zabbix Agent
Loaded: loaded (/lib/systemd/system/zabbix-agent.service; enabled; vendor preset: enabled)
Drop-In: /etc/systemd/system/zabbix-agent.service.d
└─10-custom-nice.conf
Active: active (running) since Mon 2019-01-14 11:05:42 CET; 1min 59s ago
root@server:/# ps ax -o ni,cmd | grep [z]abbix
-4 /usr/sbin/zabbix_agentd --foreground
-4 /usr/sbin/zabbix_agentd: collector [idle 1 sec]
-4 /usr/sbin/zabbix_agentd: listener #1 [waiting for connection]
-4 /usr/sbin/zabbix_agentd: listener #2 [waiting for connection]
-4 /usr/sbin/zabbix_agentd: listener #3 [waiting for connection]
-4 /usr/sbin/zabbix_agentd: active checks #1 [idle 1 sec]
root@server:/#
systemd pouziva i nas config a podle vypisu ps je nice hodnota pro vsechny zabbix procesy opravdu -4.