Unable to create the pid file (/run/php-fpm/php-fpm pid no such file or directory)

Question

I installed php8.1 on ubuntu 18.04 but getting problems. I am getting 502 Bad Gateway error. The error.log is giving following error:

Table of Contents Show

How do I enable FPM?
How do I know if PHP
How do I download PHP
What is PHP

2022/06/30 17:48:38 [crit] 2224#2224: *1 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: _, request: "GET /w3_scalar.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "localhost

Other details are:

$ sudo nginx -t
[sudo] password for zulfi: 
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

and

$ sudo systemctl restart php8.1-fpm
~$ sudo systemctl status nginx.service
● nginx.service - A high performance web server and a reverse proxy server
   Loaded: loaded (/lib/systemd/system/nginx.service; enabled; vendor preset: en
   Active: active (running) since Wed 2022-06-29 15:49:48 CDT; 1 day 2h ago
     Docs: man:nginx(8)
  Process: 2220 ExecStart=/usr/sbin/nginx -g daemon on; master_process on; (code
  Process: 2010 ExecStartPre=/usr/sbin/nginx -t -q -g daemon on; master_process 
 Main PID: 2221 (nginx)
    Tasks: 13 (limit: 4915)
   CGroup: /system.slice/nginx.service
           ├─2221 nginx: master process /usr/sbin/nginx -g daemon on; master_pro
           ├─2224 nginx: worker process
           ├─2226 nginx: worker process



~$ journalctl -xe
-- Unit systemd-hostnamed.service has finished starting up.
-- 
-- The start-up result is RESULT.
Jun 30 17:58:08 lc2530hz audit[20050]: AVC apparmor="ALLOWED" operation="connect
Jun 30 17:58:08 lc2530hz audit[20050]: AVC apparmor="ALLOWED" operation="file_pe
Jun 30 17:58:08 lc2530hz audit[20050]: AVC apparmor="ALLOWED" operation="file_pe
Jun 30 17:58:08 lc2530hz audit[20050]: AVC apparmor="ALLOWED" operation="file_pe
Jun 30 17:58:08 lc2530hz audit[20050]: AVC apparmor="ALLOWED" operation="file_pe
Jun 30 17:58:08 lc2530hz kernel: audit: type=1400 audit(1656629888.891:266): app
Jun 30 17:58:08 lc2530hz kernel: audit: type=1400 audit(1656629888.891:267): app
Jun 30 17:58:08 lc2530hz kernel: audit: type=1400 audit(1656629888.891:268): app
Jun 30 17:58:08 lc2530hz kernel: audit: type=1400 audit(1656629888.891:269): app
Jun 30 17:58:08 lc2530hz kernel: audit: type=1400 audit(1656629888.891:270): app
Jun 30 17:58:09 lc2530hz org.gnome.Nautilus[4167]: func=xmlSecCheckVersionExt:fi
Jun 30 17:58:09 lc2530hz kernel: CPU4: Core temperature above threshold, cpu clo
Jun 30 17:58:09 lc2530hz kernel: CPU10: Core temperature above threshold, cpu cl
Jun 30 17:58:09 lc2530hz kernel: CPU4: Core temperature/speed normal
Jun 30 17:58:09 lc2530hz kernel: CPU10: Core temperature/speed normal

Files information is:

/etc/php/8.1/fpm/php-fpm.conf
pid = /run/php/php8.1-fpm.pid
error_log = /var/log/php8.1-fpm.log
include=/etc/php/8.1/fpm/pool.d/*.conf

/etc/php/8.1/fpm/pool.d/www.conf:
user = www-data
group = www-data
listen = /run/php/php8.1-fpm.sock
listen.group = www-data
listen = 127.0.0.1:9000

Some body please guide me how to solve this bad Gateway 502 error when I execute my php file on browser using : http://localhost/w3_scalar.php

Note the above file was running on php 7.4 Zulfi.

==Jul 3 2022 @Tom Yan :First command

 $ systemctl status php8.1-fpm
    ● php8.1-fpm.service - The PHP 8.1 FastCGI Process Manager
       Loaded: loaded (/lib/systemd/system/php8.1-fpm.service; enabled; vendor prese
       Active: active (running) since Sun 2022-07-03 16:58:24 CDT; 42min ago
         Docs: man:php-fpm8.1(8)
      Process: 2087 ExecStartPost=/usr/lib/php/php-fpm-socket-helper install /run/ph
     Main PID: 1921 (php-fpm8.1)
       Status: "Processes active: 0, idle: 2, Requests: 0, slow: 0, Traffic: 0req/se
        Tasks: 3 (limit: 4915)
       CGroup: /system.slice/php8.1-fpm.service
               ├─1921 php-fpm: master process (/etc/php/8.1/fpm/php-fpm.conf)
               ├─2079 php-fpm: pool www
               └─2085 php-fpm: pool www
    
    Jul 03 16:58:24 lc2530hz systemd[1]: Starting The PHP 8.1 FastCGI Process Manage
    Jul 03 16:58:24 lc2530hz systemd[1]: Started The PHP 8.1 FastCGI Process Manager

Second Command:

$ journalctl -bu php8.1-fpm
Failed to parse boot descriptor 'u'

I found the following link: https://stackoverflow.com/questions/51158830/nginx-connect-to-unix-var-run-php7-2-fpm-sock-failed-2-no-such-file-or-dir,

but it is not related to php8.1-fpm, somebody please guide me.

$ sudo ps aux | grep 'php'
[sudo] password for zulfi: 
root      1921  0.0  0.1 454156 27524 ?        Ss   16:58   0:00 php-fpm: master process (/etc/php/8.1/fpm/php-fpm.conf)
www-data  2079  0.0  0.0 456452 13896 ?        S    16:58   0:00 php-fpm: pool www
www-data  2085  0.0  0.0 456452 13896 ?        S    16:58   0:00 php-fpm: pool www
zulfi    13627  0.0  0.0 210984  6284 ?        Sl   17:39   0:00 /usr/lib/libreoffice/program/oosplash --writer file:///home/zulfi/Linux_Forum_SC%20Tools/nginx/nginx%20for%20php8/502%20bad%20gateway%20connect%20problem8p1.odt
zulfi    13646 99.7  2.7 2006652 443460 ?      Rl   17:39  25:54 /usr/lib/libreoffice/program/soffice.bin --writer file:///home/zulfi/Linux_Forum_SC%20Tools/nginx/nginx%20for%20php8/502%20bad%20gateway%20connect%20problem8p1.odt --splash-pipe=5
zulfi    15893  0.0  0.0  14432  1116 pts/0    S+   18:05   0:00 grep --color=auto php

Also: ~$ sudo systemctl is-active php8.1-fpm.service active

@Tom Yan

$ ls -l /var/
total 52
drwxr-xr-x  2 root root     4096 Jul  3 17:03 backups
drwxr-xr-x 18 root root     4096 May 27 17:18 cache
drwxrwsrwt  2 root whoopsie 4096 Jun 22 16:44 crash
drwxr-xr-x 86 root root     4096 Feb 18 23:31 lib
drwxrwsr-x  2 root staff    4096 Apr 24  2018 local
lrwxrwxrwx  1 root root        9 Feb  8  2019 lock -> /run/lock
drwxrwxr-x 18 root syslog   4096 Jul  3 17:03 log
drwxrwsr-x  2 root mail     4096 Jul 24  2018 mail
drwxrwsrwt  2 root whoopsie 4096 Jul 24  2018 metrics
drwxr-xr-x  2 root root     4096 Jul 24  2018 opt
lrwxrwxrwx  1 root root        4 Feb  8  2019 run -> /run
drwxr-xr-x 21 root root     4096 Apr 12 23:08 snap
drwxr-xr-x  7 root root     4096 Jul 24  2018 spool
drwxrwxrwt  9 root root     4096 Jul  3 18:09 tmp
drwxrwxrwx  3 root root     4096 May 23  2019 w

@Tom Yan

still getting: 2022/07/03 18:48:19 [crit] 2108#2108: *6 connect() to unix:/var/run/php/php8.1-fpm.sock failed (2: No such file or directory) while connecting to upstream, client: 127.0.0.1, server: _, request: "GET /w3_static.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php/php8.1-fpm.sock:", host: "localhost"

status:

$ sudo systemctl status /var/run/php/php8.1-fpm.sock
[sudo] password for zulfi: 
Unit var-run-php-php8.1\x2dfpm.sock.mount could not be found.

My listen=listen = /run/php/php8.1-fpm.sock, should I change it to /var/run/php8.1-fpm.sock?

@Tom Yan,stat gives me error:

$stat /var/run/php/php8.1-fpm.sock
stat: cannot stat '/var/run/php/php8.1-fpm.sock': No such file or directory

I have other versions also:

$ ls /etc/php
7.2  8.0  8.1

Are they creating problem? @Tom Yan ==July 4, 2022

~$ ls /var/run/
acpid.pid             initctl             snap.docker
acpid.socket          initramfs           snapd-snap.socket
alsa                  libvirt             snapd.socket
apache2               libvirtd.pid        spice-vdagentd
avahi-daemon          lock                sshd
boltd                 log                 sshd.pid
console-setup         lvm                 sudo
containerd            lvmetad.pid         systemd
crond.pid             mlocate.daily.lock  teamviewerd.ipc
crond.reboot          mount               teamviewerd.pid
cups                  mysqld              thermald
dbus                  netns               tmpfiles.d
dhclient6-wlp2s0.pid  network             udev
dhclient-wlp2s0.pid   NetworkManager      udisks2
dmeventd-client       nginx.pid           unattended-upgrades.lock
dmeventd-server       php                 user
docker                plymouth            utmp
docker.pid            pppconfig           uuidd
docker.sock           rsyslogd.pid        wpa_supplicant
ebtables.lock         sendsigs.omit.d     xtables.lock
gdm3                  shm
gdm3.pid              snapd

and

@lc2530hz:

~$ ls /var/run/php
php8.1-fpm.pid

@lc2530hz:~$ Also www.conf has following addition:

listen.user  = www-data

and listen = 127.0.0.1:9000 changed to:

listen = 127.0.0.1

Do I still need:

listen.owner = www-data

@Tom Yan, I am getting failed message:

$ sudo systemctl restart php8.1-fpm
Job for php8.1-fpm.service failed because the control process exited with error code.
See "systemctl status php8.1-fpm.service" and "journalctl -xe" for details.
zulfi@lc2530hz:/etc/php/8.1/fpm/pool.d$ systemctl status php8.1-fpm.service
● php8.1-fpm.service - The PHP 8.1 FastCGI Process Manager
   Loaded: loaded (/lib/systemd/system/php8.1-fpm.service; enabled; vendor prese
   Active: failed (Result: exit-code) since Mon 2022-07-04 18:26:53 CDT; 1min 54
     Docs: man:php-fpm8.1(8)

and $ journalctl -xe Jul 04 18:28:48 lc2530hz kernel: CPU6: Package temperature above threshold, cpu Jul 04 18:28:48 lc2530hz kernel: CPU1: Package temperature above threshold, cpu Jul 04 18:28:48 lc2530hz kernel: CPU7: Pack

ag

Zulfi.

How do I enable FPM?

Enable PHP-FPM for multiple domains:.

Log into WHM..

Navigate to MultiPHP Manager..

In the bottom section, under Set PHP Version per Domain, scroll through your list of domains and click the checkbox to the left of each domain you want to enable PHP-FPM on..

How do I know if PHP

To find out php version installed on the server type any one of the following commands on your server. Open the terminal prompt and then type the following commands. Are you using php-fpm? Get php version using the php-fmp -v or php-fpm73 -v command.

How do I download PHP

How to Install PHP-FPM with Apache on Ubuntu 20.04.

Step 1: Add PPA for PHP 8.1. Add the ondrej/php which has PHP 8.1 package and other required PHP extensions. ... .

Step 2: Install PHP 8.1 FPM. ... .

Step 3: Install Apache. ... .

Step 4: Configure Apache with PHP-FPM. ... .

Step 6: Configure Apache Virtual Hosts. ... .

Step 7: Verify PHP-FPM with Apache..

What is PHP

Description. The PHP language is an Open Source general-purpose scripting language that is popular with web-developers who leverage its ability to create dynamically generated web pages. PHP-FPM is a PHP FastCGI implementation that controls process management, workers, and logging for PHP.