Attached is a debdiff for noble which fixes this issue V2
** Description changed:
[Impact]
If you use policy-rc.d to prevent unattended-upgrades from restarting your
services outside of a reboot or shutdown, it reveals a circular dependency
loop between nginx and nginx-common, where it cannot start nginx before
nginx-common is configured.
systemd[1]: Starting nginx.service - A high performance web server and a
reverse proxy server...
nginx[1634]: 2025/02/07 02:21:56 [emerg] 1634#1634: open()
"/etc/nginx/nginx.conf" failed (2: No such file or directory)
nginx[1634]: nginx: configuration file /etc/nginx/nginx.conf test failed
...
dpkg: error processing package nginx (--configure):
- installed nginx package post-installation script subprocess returned error
exit status 1
+ installed nginx package post-installation script subprocess returned error
exit status 1
dpkg: dependency problems prevent configuration of nginx-common:
- nginx-common depends on nginx (<< 1.26.0-2ubuntu3.1~); however:
- Package nginx is not configured yet.
+ nginx-common depends on nginx (<< 1.26.0-2ubuntu3.1~); however:
+ Package nginx is not configured yet.
dpkg: error processing package nginx-common (--configure):
- dependency problems - leaving unconfigured
-
+ dependency problems - leaving unconfigured
+
The solution is to remove the circular dependency, by dropping the dependency
for
nginx from nginx-common, as suggested by Thomas Ward.
[Testcase]
Deploy a fresh Noble or Oracular VM.
1) sudo vim /usr/sbin/policy-rc.d
#!/bin/sh
exit 0
2) sudo chmod 755 /usr/sbin/policy-rc.d
3) sudo apt update
4) sudo apt install -y nginx
Selecting previously unselected package nginx.
Preparing to unpack .../nginx_1.26.0-2ubuntu3_amd64.deb ...
Unpacking nginx (1.26.0-2ubuntu3) ...
Setting up nginx (1.26.0-2ubuntu3) ...
Job for nginx.service failed because the control process exited with error
code.
See "systemctl status nginx.service" and "journalctl -xeu nginx.service" for
details.
invoke-rc.d: initscript nginx, action "start" failed.
× nginx.service - A high performance web server and a reverse proxy server
- Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; preset:
enabled)
- Active: failed (Result: exit-code) since Fri 2025-02-07 02:21:56 UTC;
8ms ago
- Invocation: 774e214ca6b04b2dbea5569234bfdb4b
- Docs: man:nginx(8)
- Process: 1634 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on;
master_process on; (code=exited, status=1/FAILURE)
- Mem peak: 1.4M
- CPU: 3ms
+ Loaded: loaded (/usr/lib/systemd/system/nginx.service; disabled; preset:
enabled)
+ Active: failed (Result: exit-code) since Fri 2025-02-07 02:21:56 UTC;
8ms ago
+ Invocation: 774e214ca6b04b2dbea5569234bfdb4b
+ Docs: man:nginx(8)
+ Process: 1634 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on;
master_process on; (code=exited, status=1/FAILURE)
+ Mem peak: 1.4M
+ CPU: 3ms
systemd[1]: Starting nginx.service - A high performance web server and a
reverse proxy server...
nginx[1634]: 2025/02/07 02:21:56 [emerg] 1634#1634: open()
"/etc/nginx/nginx.conf" failed (2: No such file or directory)
nginx[1634]: nginx: configuration file /etc/nginx/nginx.conf test failed
systemd[1]: nginx.service: Control process exited, code=exited,
status=1/FAILURE
systemd[1]: nginx.service: Failed with result 'exit-code'.
systemd[1]: Failed to start nginx.service - A high performance web server and
a reverse proxy server.
dpkg: error processing package nginx (--configure):
- installed nginx package post-installation script subprocess returned error
exit status 1
+ installed nginx package post-installation script subprocess returned error
exit status 1
dpkg: dependency problems prevent configuration of nginx-common:
- nginx-common depends on nginx (<< 1.26.0-2ubuntu3.1~); however:
- Package nginx is not configured yet.
+ nginx-common depends on nginx (<< 1.26.0-2ubuntu3.1~); however:
+ Package nginx is not configured yet.
dpkg: error processing package nginx-common (--configure):
- dependency problems - leaving unconfigured
+ dependency problems - leaving unconfigured
Processing triggers for ufw (0.36.2-6) ...
No apport report written because the error message indicates its a followup
error from a previous failure.
-
Processing triggers for man-db (2.12.1-3) ...
+
Processing triggers for man-db (2.12.1-3) ...
Errors were encountered while processing:
- nginx
- nginx-common
+ nginx
+ nginx-common
needrestart is being skipped since dpkg has failed
Error: Sub-process /usr/bin/dpkg returned an error code (1)
Test packages are available in the following ppa:
https://launchpad.net/~mruffell/+archive/ubuntu/sf405956-updates
If you install the test package, you can install nginx correctly with
policy-rc.d.
We also need to test the upgrade path from old packages to new packages to
ensure there are no dependency issues.
[Where problems can occur]
We are changing the dependencies on the nginx-common package to not point back
to nginx. nginx already depends on nginx-common, so we shouldn't be dropping
any dependencies in the process.
If a regression were to occur, it would happen during apt dependency
resolution
or package installation time, which for a lot of users will be handled by
- unattended-upgrades, and might trigger nginx service restarts.
+ unattended-upgrades, and might trigger nginx service restarts.
[Other info]
This was fixed in debian in 1.26.0-3 by Thomas Ward
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1082373
+
https://salsa.debian.org/nginx-team/nginx/-/commit/0722a5648de88e45079f9c7c4efa9271df0d12bf
+
+ We needed a further fix to the nginx-common nginx.service file, documented in:
+ https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1098477
+ https://salsa.debian.org/nginx-team/nginx/-/issues/23
+
https://salsa.debian.org/nginx-team/nginx/-/commit/54cc7989701eb5d8ff561c6891f0a819cc54dcae
+
https://salsa.debian.org/nginx-team/nginx/-/commit/bfbdc5aef2d486391f4ca542c23d6ecf52b34d72
** Patch removed: "Debdiff for nginx on plucky"
https://bugs.launchpad.net/ubuntu/+source/nginx/+bug/2081308/+attachment/5880529/+files/lp2081308_plucky.debdiff
** Patch removed: "Debdiff for nginx on oracular"
https://bugs.launchpad.net/ubuntu/+source/nginx/+bug/2081308/+attachment/5880530/+files/lp2081308_oracular_V2.debdiff
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https://bugs.launchpad.net/bugs/2081308
Title:
Resolve circular dependency loop between nginx and nginx-common
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