Comments - Getting Started with MariaDB Galera Cluster
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Just a suggestion, but the wsrep_sst_auth variable may need to be explained more clearly. I stumbled on this for a few hours. The only reason I figured this out was by looking at the mysql error log on the DONOR.
The errors looked like this:
[ERROR] WSREP: Process completed with error: wsrep_sst_mysqldump --user '' --password '' --host '172.20.1.123' --port '3306' --local-port '33 06' --socket '/var/lib/mysql/mysql.sock' --gtid '5a568cb8-c658-11e2-0800-29e7f95d4235:0': 2 (No such file or directory)
wsrep_sst_auth needs to be defined with a username and password with root access to all dbservers in either my.cnf or as an argument to your mysqld command. The format for my.cnf is:
wsrep_sst_auth=username:password
Hope this helps.