Public bug reported:
lsb_release -rd:
Description: Ubuntu 20.04.1 LTS
Release: 20.04
apt-cache policy nginx-common:
nginx-common:
Installed: 1.18.0-0ubuntu1
Candidate: 1.18.0-0ubuntu1
Version table:
*** 1.18.0-0ubuntu1 500
500 http://ap-northeast-1c.clouds.ports.ubuntu.com/ubuntu-ports
focal-updates/main arm64 Packages
100 /var/lib/dpkg/status
1.17.10-0ubuntu1 500
500 http://ap-northeast-1c.clouds.ports.ubuntu.com/ubuntu-ports
focal/main arm64 Packages
In ubuntu 20.04, nginx use systemd to control status of nginx, the
following is part of the /lib/systemd/system/nginx.service
# ExecStop sends SIGSTOP (graceful stop) to the nginx process.
# If, after 5s (--retry QUIT/5) nginx is still running, systemd takes
control
# and sends SIGTERM (fast shutdown) to the main process.
# After another 5s (TimeoutStopSec=5), and if nginx is alive, systemd sends
# SIGKILL to all the remaining processes in the process group
(KillMode=mixed).
[Service]
Type=forking
PIDFile=/run/nginx.pid
ExecStartPre=/usr/sbin/nginx -t -q -g 'daemon on; master_process on;'
ExecStart=/usr/sbin/nginx -g 'daemon on; master_process on;'
ExecReload=/usr/sbin/nginx -g 'daemon on; master_process on;' -s reload
ExecStop=-/sbin/start-stop-daemon --quiet --stop --retry QUIT/5 --pidfile
/run/nginx.pid
TimeoutStopSec=5
As comment said, execstop will send SIGSTOP, and SIGTERM after 5 seconds
if process don't stop, but actually the command below use SIGQUIT
instead of SIGSTOP to gracefully shutdown the process.
then I looked for the nginx documentation
http://nginx.org/en/docs/control.html , nginx receive QUIT instead of
STOP.
also, refrring to the linux signal(7) https://man7.org/linux/man-
pages/man7/signal.7.html
The signals SIGKILL and SIGSTOP cannot be caught, blocked, or ignored.
nginx shouldn't be able to capture SIGSTOP and take time to gracefully
shutdown, SIGQUIT can
the comments above should change to
ExecStop sends SIGQUIT (graceful stop) to the nginx process.
If there's anything I missed it, pls let me know, thanks
** Affects: nginx (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1919965
Title:
nginx-common nginx.service comments use wrong signal
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