ubuntu 21.10 upgrade apache sticking to php7.4

Question

I upgraded from ubuntu 21.04 to 21.10.

apache2 does not change to php8 even after a2dismod php7.4 (...). I get the following error. I checked the config files in apache/ but could not find a line for it.

[Fri Jan 07 13:04:04.231832 2022] [proxy:error] [pid 1320] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /run/php/php7.4-fpm.sock (*) failed

[Fri Jan 07 13:04:04.231889 2022] [proxy_fcgi:error] [pid 1320] [client 127.0.0.1:50726] AH01079: failed to make connection to backend: httpd-UDS, referer: http://localhost/oodb...

[Fri Jan 07 13:04:04.780393 2022] [proxy:error] [pid 1319] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /run/php/php7.4-fpm.sock (*) failed

[Fri Jan 07 13:04:04.780431 2022] [proxy_fcgi:error] [pid 1319] [client 127.0.0.1:50728] AH01079: failed to make connection to backend: httpd-UDS, referer: http://localhost/...

[Fri Jan 07 13:04:06.829607 2022] [proxy:error] [pid 1318] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /run/php/php7.4-fpm.sock (*) failed

Answer 1

Even after using commands like below the problem remained.

• sudo systemctl enable php8-fpm
• sudo systemctl disable php7.4-fpm

Only after manually deleting the link conf-enabled/php7.4-fpm.conf (/etc/apache2) and setting symoblic link (sudo ln -s ../conf-available/php8.0-fpm.conf) apache worked (after restart).