Updated mysqld_multi script to be able to pass custom parameters to mysql #247
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…ysql. This also allows to override values already defined in config if needed without needing to touch the original config files.
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This is useful when a multi-instance MySQL server is used with async replication and/or with Galera libraries. For example to start a node without replication enabled, or bootstrap a new Galera cluster or to perform some special one-time operation like the wsrep-recovery. Without this new feature we need to use a dedicated file per each instance when we need to perform that kind of operation, loosing the ability to manage all the instance with a single my.cnf file. Starting a mysql async slave without replication enabled: Bootstrapping a new Galera cluster can be done with this change very easily: In this case the parameters give by command line will override the ones in the my.cnf file, giving us the ability to not touch a working config file. Perform a recovery of a desynced node become: We had the need to perform this kind of operations, sometimes during outages, so creating each time a dedicated config file that particular instance is not suitable, and as far I can see is the only solution at the moment. We're already using this patch internally on all our MySQL multi-instance boxes, keeping one single my.cnf configuration file easy to read and maintain. |
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Done! |
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This also allows to override values already defined in config if
needed without needing to touch the original config files.