Recover This Crashed MariaDB Galera Cluster

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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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Lab Info

Level

Intermediate

Last updated

Jul 24, 2025

Duration

15m

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.
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 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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