shinken poller creates zombie processes when host is unreacheable (ping check)

[arthurzenika]

Running shinken 2.4 in docker

25372 ?        Sl     0:00  |   \_ docker-containerd-shim 037462e6207b925c5f48a6a68d0e6646c74b63c631d01d38f2394a33d06f2260 /var/run/docker/libcontainerd/037462
25541 ?        Ssl    0:21  |   |   \_ python /usr/bin/shinken-scheduler --replace -c /etc/shinken/daemons/schedulerd.ini
26401 ?        S      0:00  |   |       \_ python /usr/bin/shinken-scheduler --replace -c /etc/shinken/daemons/schedulerd.ini
25377 ?        Sl     0:00  |   \_ docker-containerd-shim 91477a14b10ebd307e46463abaf741365c8f93ec3e85df40ad8873f6f1067c58 /var/run/docker/libcontainerd/91477a
25502 ?        Ssl    0:13  |   |   \_ python /usr/bin/shinken-reactionner --replace -c /etc/shinken/daemons/reactionnerd.ini
26167 ?        Sl     0:01  |   |       \_ python /usr/bin/shinken-reactionner --replace -c /etc/shinken/daemons/reactionnerd.ini
27702 ?        S      0:00  |   |       \_ python /usr/bin/shinken-reactionner --replace -c /etc/shinken/daemons/reactionnerd.ini
25403 ?        Sl     0:00  |   \_ docker-containerd-shim f23617c0143f99404869478774523b135633c2f3a6055a17aa49f9bce8f514b8 /var/run/docker/libcontainerd/f23617
25503 ?        Ssl    0:00  |   |   \_ registry serve /etc/docker/registry/config.yml
25641 ?        Sl     0:00  |   \_ docker-containerd-shim b52fb1cd1599e0332c8120c431e67e720b55c986f7aa0a7dfd7a2b1e897f4cca /var/run/docker/libcontainerd/b52fb1
25682 ?        Ssl    0:14  |   |   \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemons/pollerd.ini
26470 ?        Sl     0:04  |   |       \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemons/pollerd.ini
27651 ?        S      0:00  |   |       \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemons/pollerd.ini
27665 ?        S      0:00  |   |       \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemons/pollerd.ini
27682 ?        S      0:00  |   |       \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemons/pollerd.ini
27711 ?        S      0:01  |   |       \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemons/pollerd.ini
30163 ?        Z      0:00  |   |       \_ [ping6] <defunct>
  330 ?        Z      0:00  |   |       \_ [ping6] <defunct>
 2422 ?        Z      0:00  |   |       \_ [ping6] <defunct>
 4317 ?        Z      0:00  |   |       \_ [ping6] <defunct>
 6221 ?        Z      0:00  |   |       \_ [ping6] <defunct>
 8133 ?        Z      0:00  |   |       \_ [ping6] <defunct>
 9993 ?        Z      0:00  |   |       \_ [ping6] <defunct>
11936 ?        Z      0:00  |   |       \_ [ping6] <defunct>
13787 ?        Z      0:00  |   |       \_ [ping6] <defunct>
15690 ?        Z      0:00  |   |       \_ [ping6] <defunct>
17628 ?        Z      0:00  |   |       \_ [ping6] <defunct>
19703 ?        Z      0:00  |   |       \_ [ping6] <defunct>
21626 ?        Z      0:00  |   |       \_ [ping6] <defunct>
23474 ?        Z      0:00  |   |       \_ [ping6] <defunct>
25558 ?        Z      0:00  |   |       \_ [ping6] <defunct>
27780 ?        Z      0:00  |   |       \_ [ping6] <defunct>
29774 ?        Z      0:00  |   |       \_ [ping6] <defunct>

[arthurzenika]

Getting this with normal ping (not ping6) :

 1921 ?        Ssl    0:11 /usr/bin/dockerd -H fd://
 2127 ?        Ssl    0:01  \_ docker-containerd -l unix:///var/run/docker/libcontainerd/docker-container
 3790 ?        Sl     0:00  |   \_ docker-containerd-shim b52fb1cd1599e0332c8120c431e67e720b55c986f7aa0a7
 3842 ?        Ssl    0:05  |   |   \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemons/p
 5451 ?        Sl     0:01  |   |       \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemo
 6578 ?        S      0:00  |   |       \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemo
 6631 ?        S      0:00  |   |       \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemo
 6684 ?        S      0:00  |   |       \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemo
 6726 ?        S      0:00  |   |       \_ python /usr/bin/shinken-poller --replace -c /etc/shinken/daemo
13446 ?        Z      0:00  |   |       \_ [ping] <defunct>
13493 ?        Z      0:00  |   |       \_ [ping] <defunct>
13573 ?        Z      0:00  |   |       \_ [ping] <defunct>
13651 ?        Z      0:00  |   |       \_ [ping] <defunct>

[naparuba]

Hi,

• what about without a docker on the same box?
• is the number stable or increasing over time?

[arthurzenika]

Can't test without docker on the same box sorry.

The number of stale is increasing over time (docker restart fixes that).

[adamcstephens]

https://blog.phusion.nl/2015/01/20/docker-and-the-pid-1-zombie-reaping-problem/

You can solve this with something like: https://github.com/Yelp/dumb-init/