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  1. MariaDB MaxScale
  2. MXS-1464

Add environment variables processing for maxscale.cnf

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      Description

      For Docker users (and maybe for other scenarios) it would be great if MaxScale substituted values for shell environment variables in the configuration file before reading the values. So that in case like this:

      [node1]
      type=server
      address=$MARIADB_IP1
      port=6603
      protocol=MySQLBackend
       
      [node2]
      type=server
      address=$MARIADB_IP2
      port=6603
      protocol=MySQLBackend
      

      we get easy and clean way to pass IP addresses of back end servers,

      Workarounds (like running script to pre-process template configuration files or passing configuration file from the host environment exist. but the problem is quite common to get some documented solution out of the box.

      It may be a modification to startup script, or adding more predefined variables like MAXSCALE_OPTIONS, or just change in the code for options parsing.

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            Assignee:
            johan.wikman Johan Wikman
            Reporter:
            valerii Valerii Kravchuk
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