Dovecot crashes and isn't restarted properly

Hi,

For a little while now I've had an issue with Dovecot crashing and not being restarted.

I first noticed it when Roundcube gave me a "Error connecting to storage" when I tried to log in my mailbox. Today I finally decided to look into it a bit more so I entered the container with "docker exec -ti container /bin/bash" in order to look around.

First, here's the error message in /var/log/message :

root@c50704bd7d18:/# tail -5 /var/log/messages
Aug 20 07:43:41 c50704bd7d18 mail.crit dovecot: master: Fatal: Dovecot is already running with PID 538 (read from /var/run/dovecot/master.pid)
Aug 20 07:43:42 c50704bd7d18 mail.crit dovecot: master: Fatal: Dovecot is already running with PID 538 (read from /var/run/dovecot/master.pid)
Aug 20 07:43:43 c50704bd7d18 mail.crit dovecot: master: Fatal: Dovecot is already running with PID 538 (read from /var/run/dovecot/master.pid)
Aug 20 07:43:44 c50704bd7d18 mail.crit dovecot: master: Fatal: Dovecot is already running with PID 538 (read from /var/run/dovecot/master.pid)
Aug 20 07:43:45 c50704bd7d18 mail.crit dovecot: master: Fatal: Dovecot is already running with PID 538 (read from /var/run/dovecot/master.pid)

There's no dovecot process and the process with a pid of 538 is an s6-log process :

root@c50704bd7d18:/#  ps -aux | grep -v grep | grep dovecot
root       529  0.0  0.0    200     4 ?        S+   Aug19   0:00 s6-supervise dovecot/log
root       530  0.0  0.0    200    52 ?        S+   Aug19   0:29 s6-supervise dovecot
nobody     557  0.0  0.0    260     4 ?        Ss   Aug19   0:00 s6-log -bp -- n20 s1000000 T /var/log/s6/dovecot
root@c50704bd7d18:/# ps -aux | grep -v grep | grep 538
nobody     538  0.0  0.0    260     4 ?        Ss   Aug19   0:00 s6-log -bp -- n20 s1000000 T /var/log/s6/clamd

I'm starting the container using docker-compose with the following compose file :

mailserver:
  image: analogic/poste.io
  ports:
    - "25:25"
    - "127.0.0.1:1080:80"
    - "127.0.0.1:1443:443"
    - "110:110"
    - "143:143"
    - "465:465"
    - "587:587"
    - "993:993"
    - "995:995"
  volumes:
    - /etc/localtime:/etc/localtime:ro
    - /opt/container-volumes/poste.io:/data
  restart: always
  tty: true

Running the poste.io image from August 9th : [root@ns3453436 ~]# docker images REPOSITORY TAG IMAGE ID CREATED SIZE docker.io/analogic/poste.io latest f3a24f554fd0 11 days ago 476.3 MB

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