Ask Ubuntu Asked by Dagelf on December 5, 2021
In my situation, Postfix mysteriously shuts itself down: postfix/postfix-script stopping the Postfix mail system
On a fresh Ubuntu 18.04, when I run
service postfix start
It starts up, but the a few minutes later shuts down.
May 22 09:10:15 coenraad-Latitude-E5550 postfix/postfix-script[12849]: starting the Postfix mail system
May 22 09:10:15 coenraad-Latitude-E5550 postfix/master[12851]: daemon started -- version 3.3.0, configuration /etc/postfix
May 22 09:11:41 coenraad-Latitude-E5550 postfix/postfix-script[12960]: stopping the Postfix mail system
May 22 09:11:41 coenraad-Latitude-E5550 postfix/master[12851]: terminating on signal 15
May 22 09:11:53 coenraad-Latitude-E5550 postfix/postfix-script[13167]: starting the Postfix mail system
May 22 09:11:53 coenraad-Latitude-E5550 postfix/master[13169]: daemon started -- version 3.3.0, configuration /etc/postfix
May 22 09:14:12 coenraad-Latitude-E5550 postfix/postfix-script[14044]: stopping the Postfix mail system
May 22 09:14:12 coenraad-Latitude-E5550 postfix/master[13169]: terminating on signal 15
I’ve enabled the service with:
sudo update-rc.d postfix enable
There is plenty of free memory and nothing else that seems related in any logs.
At first I thought that I somehow managed to install postfix without configuring it. The problem seemed to be solved by:
dpkg-reconfigure postfix
I figured this out with the command:
lastcomm --debug
after each shut down, and I found:
CURRENT REC: systemd.postins |v3| 0.00| 0.00| 21.00| 0| 0| 4628.00| 0.00| 13513| 13305| | 0|pts/11 |Wed May 22 09:13:02 2019
systemd.postins root pts/11 0.00 secs Wed May 22 09:13
---------------------------------------------------------------------------
CURRENT REC: systemctl |v3| 1.00| 0.00| 21.00| 0| 0| 73472.00| 0.00| 13514| 13513|S | 0|pts/11 |Wed May 22 09:13:02 2019
systemctl S root pts/11 0.01 secs Wed May 22 09:13
---------------------------------------------------------------------------
CURRENT REC: (sd-executor) |v3| 0.00| 0.00| 1.00| 0| 0|226496.00| 0.00| 13516| 1|SF | 0|__ |Wed May 22 09:13:02 2019
(sd-executor) SF root __ 0.00 secs Wed May 22 09:13
---------------------------------------------------------------------------
CURRENT REC: systemd-sysv-ge |v3| 0.00| 0.00| 1.00| 0| 0| 61832.00| 0.00| 13532| 13516|S | 0|__ |Wed May 22 09:13:02 2019
systemd-sysv-ge S root __ 0.00 secs Wed May 22 09:13
---------------------------------------------------------------------------
CURRENT REC: postfix-instanc |v3| 0.00| 0.00| 1.00| 0| 0| 4628.00| 0.00| 13519| 13516|S | 0|__ |Wed May 22 09:13:02 2019
postfix-instanc S root __ 0.00 secs Wed May 22 09:13
---------------------------------------------------------------------------
CURRENT REC: postconf |v3| 0.00| 0.00| 0.00| 0| 0| 76928.00| 0.00| 13535| 13519| | 0|__ |Wed May 22 09:13:02 2019
postconf root __ 0.00 secs Wed May 22 09:13
---------------------------------------------------------------------------
CURRENT REC: systemd-rc-loca |v3| 0.00| 0.00| 1.00| 0| 0| 61816.00| 0.00| 13529| 13516|S | 0|__ |Wed May 22 09:13:02 2019
systemd-rc-loca S root __ 0.00 secs Wed May 22 09:13
Which made it look like it's trying to do some interactive configuration in the background - which presumably it was programmed to abort if its not in an interactive session. Manual configuration seemed to flip the necessary switches.
The saga continued... I checked cron of different users, auditd log, system logs for OOM killer, I just could not find the culprit.
What eventually saved me from insanity, was Ciro Santilli's answer here: https://superuser.com/questions/222912/how-can-i-log-all-process-launches-in-linux - which I monitored until it stopped, where it logged this:
20119 2102 /etc/init.d/postfix stop
And then
$ ps auxf|grep 2102
root 2102 0.0 0.0 40820 3940 ? S May28 2:58 /usr/bin/monit -c /etc/monit/monitrc
There we have it. The culprit is monit.
Answered by Dagelf on December 5, 2021
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