Working as an Infrastructure Engineer, I have to deal a lot with migration tasks. One of my most paintful experience is to using multiple versions of php on the same server. Here is my notes when installing multiple php-fpm on the same servers

For example when I install php-fpm-7.2 and php-fpm-7.1 on the same server, I always get this error when starting the two processes:

$ sudo /etc/init.d/php-fpm-7.2 start
$ sudo /etc/init.d/php-fpm-7.1 start

When running these two commands, I always got php-fpm-7.1 started, not php-fpm-7.2, so what is the problem ? Because these two processes used the same configurations file in /etc/php-fpm.conf so whether we started php-fpm-7.1 or php-fpm-7.2, only one processes get called. So what can you do in this situation ?

1. Rename the file in /etc/php-fpm.conf to something else
2. Enable custom config file in /etc/sysconfig/php-fpm-7.2. Below is the file's content :

  1 # Additional environment file for php-fpm
  2 # Uncomment below to use the php 7.2 specific configuration file
  3 OPTIONS="-y /etc/php-fpm-7.2.conf"

Just uncomment the third line, then everything is OK.