The Ultimate Guide to High Availability with MariaDB
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Galera Cluster - Mysqld_multi

Hi, I need to configure Galera cluster on 3 nodes with multiple mariadb instances (Mysqld_multi) running on each nodes. Documentation i have found on the web only cover single instance of mariadb with Galera. Don't know what to put exactly in my server.cnf and how to start Galera on first node. I tried to launch 'galera_new_cluster' but i can't connect to any of the instances defined in server.cnf (mysqld1,mysqld2,....). It seems that only the default instance is started by 'Galera_New_Cluster' command. If i uncomment Galera section in server.cnf, it works fine and i can access all the instances of mariadb.

Kind Regards

vincent

Answer Answered by Geoff Montee in this comment.

Since you mentioned galera_new_cluster, it sounds like you're using systemd. If you are using systemd, then you can use the relevant systemd method for interacting with multiple MariaDB instances instead of mysqld_multi.

Regarding galera_new_cluster, with the multi-instance method, you can pass the instance's suffix to the script:

$ galera_new_cluster mariadb@node1

If you can't get that to work, then it might be a bit easier to add --wsrep-new-cluster to the configuration file whenever you want to bootstrap a node.

Other things to keep in mind:

You need to ensure that each instance is configured with a different datadir.

You also need to ensure that each instance is configured with different network ports:

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