Public bug reported:
As discussed in [1], there is a bug in nginx [2] which makes Ubuntu's
systemd unit restarts fail when nginx is litening on a unix domain
socket. This happens because nginx fails to remove the socket during its
shutdown process.
This issue has been reported in Debian in [3], and has been fixed
upstream since 1.19.1, with the following patch: [4].
To reproduce the issue, run the following commands from a jammy machine:
# apt install -y nginx
# systemctl stop nginx
# mkdir -p /var/www/files
# echo hello > /var/www/files/hello
# cat << EOF > /run/serve-files.socket
server {
listen unix:/run/serve-files.socket;
root /var/www/files;
location / {
try_files $uri =404;
}
}
EOF
# systemctl start nginx
Verify it works with:
# echo -e "GET /hello HTTP/1.0\r\n" | netcat -U /run/serve-files.socket
And restart the service:
# systemctl restart nginx
This will throw an error and the service will end in a failed state.
Verify that the socket file in /run/serve-files.socket was not removed.
Removing the socket file should allow you to restart the service.
[1] https://bugs.launchpad.net/ubuntu/+source/nginx/+bug/1919965
[2] https://trac.nginx.org/nginx/ticket/753
[3] https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=821111
[4] http://hg.nginx.org/nginx/rev/7cbf6389194b
** Affects: nginx (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1957320
Title:
Cannot restart nginx when listening on UNIX domain sockets
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