Apache fails to start after PHP or MySQL upgrade:
# /etc/init.d/httpd start Starting httpd: Syntax error on line 90 of /var/www/vhosts/domain.tld/conf/13687485080.36736400_httpd.include: Wrapper /var/www/cgi-bin/cgi_wrapper/cgi_wrapper cannot be accessed: (2)No such file or directory [FAILED]
# service httpd start Starting httpd: Syntax error on line 35 of /etc/httpd/conf/plesk.conf.d/horde.conf: Wrapper /var/www/cgi-bin/cgi_wrapper/cgi_wrapper cannot be accessed: (2)No such file or directory [FAILED]
PHP or MySQL packages were removed and installed again.
The following command returns empty output:
# rpm -q psa
# rpm -q plesk-core
Plesk package was uninstalled as dependency during PHP or MySQL removal.
A sample scenario: at some point during the upgrade, the following command was manually executed to remove PHP packages:
# yum remove php php-cli php-common php-devel php-gd php-mbstring
# yum remove mysql-server
On most of systems, Plesk will be uninstalled as a result of the command above.
PHP and MySQL packages are one of dependencies for Plesk. Removal of PHP or MySQL will result in Plesk removal.
We strongly recommend to be very careful while removing packages on Plesk server and also pay attention to dependencies section.
In this situation, Plesk should be installed again or server restored from backup.
Note: OS upgrade on Plesk 12 and older versions is not supported [KB115819]