Wednesday , April 21 2021

Mysql Galera Cluster for High Availability Solution

 

Steps to Install & Configure MySQL 3-Node Galera Cluster on CENTOS

Step 1: Enabling the Galera Cluster yum repositories.

 

Step 2: Install Galera and the prerequisite packages.

 

Step 3: Enable the Galera service to start at boot.

 

Step 4: Enable the service to start at boot & Start the firewalld service.

 

Step 5: Configure firewall exceptions to allow both replication and remote MySQL connections and reload the firewall.

 

Step 6: Configure SELinux to permissive mode for MySQL.

 

Step 7: Let us Configure my.cnf file.

 

Step 8: Repeat the above steps on each MySQL node that will participate in the MySQL Cluster. Be sure to alter the below fields in the /etc/my.cnf file to reflect the correct IP address and hostname that is applicable to each node.

 

Step 9 : Create the mysqld.log and give the mysql account the appropriate permissions on each node of the Galera Cluster.

 

Starting MySQL Cluster for the first time

Step 10: Start the MySQL on the first node, i.e node_alpha.

 

Step 11: After you installed MySQL 5.7 you will need to find the temporary password from /var/log/mysqld.log to login as root.

 

Step 12: Login to MySQL and run the below query to confirm the number of nodes in the cluster.

 

Step 13: Start MySQL on the other member nodes, node_beta and node_gamma. Notice the command to start the MySQL service is different on subsequent member nodes.

 

Step 14: Login to MySQL and run the below query again to confirm the number of nodes in the cluster has increased.

 

Step 15 : Let’s ensure all three node IPs are currently listed in wsrep_incoming_addresses. Disconnected nodes are normally removed from the replication automatically.

 

Step 16 : Let’s create a mysql user for State Snapshot Transfer(SST) and add below parameters in my.cnf file

 

At last restart the cluster nodes.

Sarthak Tomar

About Sarthak Tomar

One comment

  1. Thanks for Sharing Detailed implementation on Cluster.

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