Applicable to:
- Plesk for Linux
Symptoms
-
Sites that use the same PHP-FPM version (for example, 7.2 are not working):
CONFIG_TEXT: 503 service unavailable
-
The following error appears in the domain's error log
/var/www/vhosts/system/example.com/logs/error_log:CONFIG_TEXT: [proxy_fcgi:error] [pid 15605:tid 140353550149376] [client 203.0.113.2:45388] AH01079: failed to make connection to backend: httpd-UDS
[proxy:error] [pid 15605:tid 140353373902592] (2)No such file or directory: AH02454: FCGI: attempt to connect to Unix domain socket /var/www/vhosts/system/example.com/php-fpm.sock (*) failed -
Socket
/var/www/vhosts/system/example.com/php-fpm.sockdoes not exist and switching PHP handler to another one at Plesk > Domains > example.com > PHP Settings recreates it, but switching PHP handler back removes it again - Running the
plesk repair web -ncommand provides output that is similar to the following:
CONFIG_TEXT: Checking for obsolete PHP-FPM configuration files
Domain example.com ............................................. [ERROR]
- Domain example.com with PHP handler plesk-php82-fpm has
obsolete PHP-FPM configuration file
/opt/plesk/php/8.1/etc/php-fpm.d/example.com
Cause
The php-fpm.sock files for several domains are missing, because the PHP-related configuration files for the affected domains and PHP versions have either become corrupted or have gone missing entirely.
Resolution
-
Log into the server via SSH
-
Restart all PHP-FPM services that are assigned to domains by executing the following command:
# systemctl restart plesk-php*
-
Recreate the missing or corrupted configuration files and PHP sockets for all domains by executing the following command:
# plesk repair web -y
If the 503 issues persist for some sites that use a specific PHP version, files that are corrupted remain, due to which you should do the following in order to recreate all of them from scratch:
1. Create a list of sites that use the specific PHP version by using the following example:
# plesk db -sNe "select name from hosting h,domains dom where dom.id = h.dom_id and php = 'true' AND php_handler_id LIKE 'plesk-php82-fpm'" domains.txt
2. Make sure a similar PHP version to the one the domains are using in the example is enabled ( plesk-php82-fastcgi for the purposes of this example) on the server
3. Switch all domains from the domains.txt file to that similar PHP version by executing the following command:
# cat domains.txt | while read i; do echo "[+] Updating domain: $i"; plesk bin domain -u $i -php_handler_id plesk-php83-fastcgi; done
4. Run the following command:
# plesk repair web -php-fpm-configuration
5. Switch all domains back to the previously used PHP version by using the following command:
# cat domains.txt | while read i; do echo "[+] Updating domain: $i"; plesk bin domain -u $i -php_handler_id plesk-php83-fpm; done
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