MySQL 5.7 cluster with Galera on RedHat 7.4
Galera Cluster is a master-master replication, this means it keeps same data on all the nodes. For this purpose it transfers data continuously between nodes (IST or SST). There are 2 methods with which you can transfer the data. Using Percona XtraBackup or rsync. We are going to use rsync. yum install rsync We need to setup SELinux in permissive mode for required ports so that nodes can communicate. For this purpose we are going to use semanage . We can install this by given command. yum install policycoreutils-python Also you firewall should not stop communication between the nodes, you can use telnet utility to check if nodes can communicate with each other on specific ports. If its not already installed, you can install it. ...