- Lab
- A Cloud Guru
Recover This Crashed MariaDB Galera Cluster
In this activity you are working as a DBA and have been tasked with recovering a crashed MariaDB Galera cluster.
Path Info
Table of Contents
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Challenge
Determine the Most Advanced Node
We can check the sequence number of the node:
sudo -u mysql mysqld --wsrep_recoverRun this on all nodes, and the highest sequence number is the most advanced node.
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Challenge
Bootstrap the Most Advanced Node
Edit the node configuration in
/etc/my.cnf.d/:wsrep_cluster_address=gcomm://Start the node:
sudo systemctl start mariadb.service -
Challenge
Check Status and Add Nodes to the Cluster
Connect with
mysqlclient and query status variables:SHOW GLOBAL STATUS WHERE Variable_name IN ('wsrep_ready', 'wsrep_cluster_size', 'wsrep_cluster_status', 'wsrep_connected');Edit the node configuration in
/etc/my.cnf.d/. Be certain to use the private IP of the running node:wsrep_cluster_address=gcom://10.0.0.110Start the node:
sudo systemctl start mariadb.service
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