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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.

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Path Info

Level
Clock icon Intermediate
Duration
Clock icon 15m
Published
Clock icon Jul 23, 2020

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Table of Contents

  1. Challenge

    Determine the Most Advanced Node

    We can check the sequence number of the node:

    sudo -u mysql mysqld --wsrep_recover

    Run this on all nodes, and the highest sequence number is the most advanced node.

  2. 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

  3. Challenge

    Check Status and Add Nodes to the Cluster

    Connect with mysql client 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://10.0.0.110

    Start the node:

    sudo systemctl start mariadb.service
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