Good catch Claudio. The bug is present in Trusty and Trusty-backports.
Prior to LP: #1477198, the stop script did not stop at all because it
relied on the --pid option that is introduced in dpkg version 1.17.6 as
outlined in the man page of start-stop-daemon :
[--pid] pid
Check for a process with the specified pid (since version
1.17.6). The pid must be a number greater than 0.
Now with the fix introduced by LP: #1477198, it will work as expected
unless nproc > 1. Otherwise, we will see the behavior described in LP:
#1481737 whereas processes other than the first PID appearing in the
pidfile will remain active.
The patch included here solves both situation as it loops through all
the PIDs in the pidfile & terminates them using a temporary pidfile.
I will carry on this explanation in the other bug so the version in
-updates is fixed as well.
This bug remains valid as we still see only the first PID being killed
with the recent patch.
--
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https://bugs.launchpad.net/bugs/1494141
Title:
HAProxy 1.5 init script does not terminate processes
Status in trusty-backports:
In Progress
Status in haproxy package in Ubuntu:
Fix Released
Status in haproxy source package in Trusty:
Invalid
Bug description:
On a new installation of Ubuntu 14.04.3 LTS I installed HAProxy 1.5
from trusty-backports (1.5.4-1ubuntu2.1~ubuntu14.04.1).
When I restarted HAProxy, I got random HTTP 503 although the backend
servers were all working fine. By checking netstat, I saw that HAProxy
was listening multiple times on the frontend ports.
It seems that the init script coming with the installation does not
work correctly. The processes are not terminated correctly when using
stop (or restart, in this matter, either).
Only with a kill I was able to correctly terminate the HAProxy
processes.
The following output should show more clarity:
root@mylinux:~# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
PID/Program name
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
4653/haproxy
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
4221/haproxy
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
956/nginx
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
855/sshd
tcp 0 0 0.0.0.0:8090 0.0.0.0:* LISTEN
4653/haproxy
tcp 0 0 0.0.0.0:8090 0.0.0.0:* LISTEN
4221/haproxy
tcp 0 0 0.0.0.0:8099 0.0.0.0:* LISTEN
4653/haproxy
tcp 0 0 0.0.0.0:8099 0.0.0.0:* LISTEN
4221/haproxy
tcp6 0 0 :::22 :::* LISTEN
855/sshd
root@mylinux:~# service haproxy stop
* Stopping haproxy haproxy
[ OK ]
root@mylinux:~# service haproxy status
haproxy not running.
root@mylinux:~# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
PID/Program name
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
4653/haproxy
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
4221/haproxy
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
956/nginx
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
855/sshd
tcp 0 0 0.0.0.0:8090 0.0.0.0:* LISTEN
4653/haproxy
tcp 0 0 0.0.0.0:8090 0.0.0.0:* LISTEN
4221/haproxy
tcp 0 0 0.0.0.0:8099 0.0.0.0:* LISTEN
4653/haproxy
tcp 0 0 0.0.0.0:8099 0.0.0.0:* LISTEN
4221/haproxy
tcp6 0 0 :::22 :::* LISTEN
855/sshd
root@mylinux:~# killall haproxy
root@mylinux:~# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
PID/Program name
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
956/nginx
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
855/sshd
tcp6 0 0 :::22 :::* LISTEN
855/sshd
root@mylinux:~# service haproxy start
* Starting haproxy haproxy
[ OK ]
root@mylinux:~# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
PID/Program name
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
8205/haproxy
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
956/nginx
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
855/sshd
tcp 0 0 0.0.0.0:8090 0.0.0.0:* LISTEN
8205/haproxy
tcp 0 0 0.0.0.0:8099 0.0.0.0:* LISTEN
8205/haproxy
tcp6 0 0 :::22 :::* LISTEN
855/sshd
root@mylinux:~# service haproxy restart
* Restarting haproxy haproxy
[ OK ]
root@nzzad-lb01-test:~# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
PID/Program name
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
8286/haproxy
tcp 0 0 0.0.0.0:8080 0.0.0.0:* LISTEN
8205/haproxy
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN
956/nginx
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
855/sshd
tcp 0 0 0.0.0.0:8090 0.0.0.0:* LISTEN
8286/haproxy
tcp 0 0 0.0.0.0:8090 0.0.0.0:* LISTEN
8205/haproxy
tcp 0 0 0.0.0.0:8099 0.0.0.0:* LISTEN
8286/haproxy
tcp 0 0 0.0.0.0:8099 0.0.0.0:* LISTEN
8205/haproxy
tcp6 0 0 :::22 :::* LISTEN
855/sshd
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