Interesting,
thanks for confirming that after creating "/var/run/php" manually it works for
you.
Indeed /var/run is a temporary directory, and all such are expected by
the packages to be re-created on boot as needed. That is present for
php-fpm here
$ dpkg -S /usr/lib/tmpfiles.d/php7.4-fpm.conf
php7.4-fpm: /usr/lib/tmpfiles.d/php7.4-fpm.conf
$ cat /usr/lib/tmpfiles.d/php7.4-fpm.conf
#Type Path Mode UID GID Age Argument
d /run/php 0755 www-data www-data - -
With that in place I'd expect that on reboot that directory would always be
re-created and then the subsequently php-fpm work on reboot.
In a similar fashon on an install/upgrade the configure step of the postinst
/var/lib/dpkg/info/php7.4-fpm.postinst will run
systemd-tmpfiles --create php7.4-fpm.conf >/dev/null || true
before starting php7.4-fpm
Could you maybe have a look if that silently fails and if it does why?
Because we will need to track down why this directory isn't created in your
case to consider a fix or further user-guidance.
A sequence like this should work in a normal Ubuntu system:
$ systemctl stop php7.4-fpm; rm -rf /var/run/php; systemd-tmpfiles --create
php7.4-fpm.conf; systemctl start php7.4-fpm; ll -laF /var/run/php; systemctl
status php7.4-fpm
total 4
drwxr-xr-x 2 www-data www-data 100 Oct 11 06:51 ./
drwxr-xr-x 29 root root 940 Oct 11 06:51 ../
lrwxrwxrwx 1 root root 30 Oct 11 06:51 php-fpm.sock ->
/etc/alternatives/php-fpm.sock=
-rw-r--r-- 1 root root 4 Oct 11 06:51 php7.4-fpm.pid
srw-rw---- 1 www-data www-data 0 Oct 11 06:51 php7.4-fpm.sock=
● php7.4-fpm.service - The PHP 7.4 FastCGI Process Manager
Loaded: loaded (/lib/systemd/system/php7.4-fpm.service; enabled; vendor
preset: enabled)
Active: active (running) since Mon 2021-10-11 06:51:38 UTC; 39s ago
Docs: man:php-fpm7.4(8)
Process: 1656 ExecStartPost=/usr/lib/php/php-fpm-socket-helper install
/run/php/php-fpm.sock /etc/php/7.4/fpm/pool.d/www.conf 74 (code=exited,
status=0/SUCCESS)
Main PID: 1653 (php-fpm7.4)
Status: "Processes active: 0, idle: 2, Requests: 0, slow: 0, Traffic:
0req/sec"
Tasks: 3 (limit: 38267)
Memory: 11.1M
CGroup: /system.slice/php7.4-fpm.service
├─1653 php-fpm: master process (/etc/php/7.4/fpm/php-fpm.conf)
├─1654 php-fpm: pool www
└─1655 php-fpm: pool www
Does this sequence work on your system?
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https://bugs.launchpad.net/bugs/1945687
Title:
package php7.4-fpm 7.4.3-4ubuntu2.6 failed to install/upgrade:
installed php7.4-fpm package post-installation script subprocess
returned error exit status 1
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