Am 12.05.2016 um 11:46 schrieb liuxueping:
Before i restart ntpd,ntpd process was running: ntp 3993 0.0 0.0 7404 4156 ? Ss 10:21 0:00 /usr/sbin/ntpd -u ntp:ntp -g root 3995 0.0 0.0 7404 2364 ? S 10:21 0:00 /usr/sbin/ntpd -u ntp:ntp -g so,it should be killed by systemctl and restart a new ntpd process,but it failed,i want to know systemd how to judge that a process is killed completed to start a new service.
again: systemd monitors all processes part of a service systemctl itself does nothing, it just invokes commandswhen you manually started a ntpd process systemd don't know it should be killed and *it should not* get killed just because "systemctl restart ntpd"
so when there is a ntpd process which is not listed in "systemctl status" you or something has manually fired up that process - don't do that at all - and you need to kill it the same way
[root@rh:~]$ systemctl status ntpd ● ntpd.service - Network Time ServiceLoaded: loaded (/etc/systemd/system/ntpd.service; enabled; vendor preset: disabled)
Active: active (running) since Do 2016-05-12 10:17:54 CEST; 1h 31min ago
Main PID: 981 (ntpd)
CGroup: /system.slice/ntpd.service
└─981 /usr/sbin/ntpd -4 -d -u ntp:ntp -p /var/run/ntpd.pid -g
在 2016/5/12 16:51, Reindl Harald 写道:Am 12.05.2016 um 09:17 schrieb liuxueping:Hi: It failed when i restarted ntpd service,the log showed:ntpd[3163]: unable to bind to wildcard address 0.0.0.0 - another process may be running - EXITING,and the ps command result showed: ntp 3993 0.0 0.0 0 0 ? Ds 10:21 0:00 [ntpd] root 3995 0.0 0.0 0 0 ? Z 10:21 0:00 [ntpd] <defunct> Maybe it failed because a ntpd process was still in system when started a new ntpd service.If so, how does systemctl judge that a process is over and start a new process?most likely the running one was not started by ntpd.service and hence is also not killed by systemctl - systemd is not a blind butcher like shell-scripts - it *knows* which processes are part of a service/service-group
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