That makes some sort of sense. The action for reload is "Just" a signal to MAINPID ExecReload=/bin/kill -HUP $MAINPID
I think the failure is a second -HUP signal before the former reload is fully complete. And on a more complex keepalived setup this might also be a longer time-window to trigger. Yet the service files in Xenial and Zesty are identical, and I'd not know one can wait for a signal to be handled. Might even be a systemd fix in Zesty that now "waits" for such to complete. So lessons learned, I seem to be able to reliably trigger it with a head to head restart: "sudo systemctl restart keepalived; sudo systemctl restart keepalived;" Going to my Zesty env to confirm that there. -- You received this bug notification because you are a member of Ubuntu High Availability Team, which is subscribed to keepalived in Ubuntu. https://bugs.launchpad.net/bugs/1644530 Title: keepalived fails to restart cleanly due to the wrong systemd settings Status in keepalived package in Ubuntu: Fix Released Status in keepalived source package in Xenial: Confirmed Bug description: Because "PIDFile=" directive is missing in the systemd unit file, keepalived sometimes fails to kill all old processes. The old processes remain with old settings and cause unexpected behaviors. The detail of this bug is described in this ticket in upstream: https://github.com/acassen/keepalived/issues/443. The official systemd unit file is available since version 1.2.24 by this commit: https://github.com/acassen/keepalived/commit/635ab69afb44cd8573663e62f292c6bb84b44f15 This includes "PIDFile" directive correctly: PIDFile=/var/run/keepalived.pid We should go the same way. I am using Ubuntu 16.04.1, kernel 4.4.0-45-generic. Package: keepalived Version: 1.2.19-1 ======================================================================= How to reproduce: I used the two instances of Ubuntu 16.04.2 on DigitalOcean: Configurations -------------- MASTER server's /etc/keepalived/keepalived.conf: vrrp_script chk_nothing { script "/bin/true" interval 2 } vrrp_instance G1 { interface eth1 state BACKUP priority 100 virtual_router_id 123 unicast_src_ip <primal IP> unicast_peer { <secondal IP> } track_script { chk_nothing } } BACKUP server's /etc/keepalived/keepalived.conf: vrrp_script chk_nothing { script "/bin/true" interval 2 } vrrp_instance G1 { interface eth1 state MASTER priority 200 virtual_router_id 123 unicast_src_ip <secondal IP> unicast_peer { <primal IP> } track_script { chk_nothing } } Procedures ---------- 1) Start keepalived on both servers $ sudo systemctl start keepalived.service 2) Restart keepalived on either one $ sudo systemctl restart keepalived.service 3) Check status and PID $ systemctl status -n0 keepalived.service Result ------ 0) Before restart Main PID is 3402 and the subprocesses' PIDs are 3403-3406. So far so good. root@ubuntu-2gb-sgp1-01:~# systemctl status -n0 keepalived ● keepalived.service - Keepalive Daemon (LVS and VRRP) Loaded: loaded (/lib/systemd/system/keepalived.service; enabled; vendor preset: enabled) Active: active (running) since Sat 2017-03-04 01:37:12 UTC; 14min ago Process: 3402 ExecStart=/usr/sbin/keepalived $DAEMON_ARGS (code=exited, status=0/SUCCESS) Main PID: 3403 (keepalived) Tasks: 3 Memory: 1.7M CPU: 1.900s CGroup: /system.slice/keepalived.service ├─3403 /usr/sbin/keepalived ├─3405 /usr/sbin/keepalived └─3406 /usr/sbin/keepalived 1) First restart Now Main PID is 3403, which was one of the previous subprocesses and is actually exited. Something is wrong. Yet, the previous processes are all exited; we are not likely to see no weird behaviors here. root@ubuntu-2gb-sgp1-01:~# systemctl restart keepalived root@ubuntu-2gb-sgp1-01:~# systemctl status -n0 keepalived ● keepalived.service - Keepalive Daemon (LVS and VRRP) Loaded: loaded (/lib/systemd/system/keepalived.service; enabled; vendor preset: enabled) Active: active (running) since Sat 2017-03-04 01:51:45 UTC; 1s ago Process: 4782 ExecStart=/usr/sbin/keepalived $DAEMON_ARGS (code=exited, status=0/SUCCESS) Main PID: 3403 (code=exited, status=0/SUCCESS) Tasks: 3 Memory: 1.7M CPU: 11ms CGroup: /system.slice/keepalived.service ├─4783 /usr/sbin/keepalived ├─4784 /usr/sbin/keepalived └─4785 /usr/sbin/keepalived 2) Second restart Now Main PID is 4783 and subprocesses' PIDs are 4783-4785. This is problematic as 4783 is the old process, which should have exited before new processes arose. Therefore, keepalived remains in old settings while users believe it uses the new setting. root@ubuntu-2gb-sgp1-01:~# systemctl restart keepalived root@ubuntu-2gb-sgp1-01:~# systemctl status -n0 keepalived ● keepalived.service - Keepalive Daemon (LVS and VRRP) Loaded: loaded (/lib/systemd/system/keepalived.service; enabled; vendor preset: enabled) Active: active (running) since Sat 2017-03-04 01:51:49 UTC; 1s ago Process: 4796 ExecStart=/usr/sbin/keepalived $DAEMON_ARGS (code=exited, status=0/SUCCESS) Main PID: 4783 (keepalived) Tasks: 3 Memory: 1.7M CPU: 6ms CGroup: /system.slice/keepalived.service ├─4783 /usr/sbin/keepalived ├─4784 /usr/sbin/keepalived └─4785 /usr/sbin/keepalived To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/keepalived/+bug/1644530/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-ha Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntu-ha More help : https://help.launchpad.net/ListHelp
