SQL Galera Cluster is a popular open-source clustering solution that allows for synchronous replication and high availability of MySQL or MariaDB databases. One of the key tools available to manage the cluster is Galera Manager, which provides a graphical user interface (GUI) to configure and monitor cluster nodes. In this blog post, we will explore how to set up and manage cluster nodes using Galera Manager.

Installing Galera Manager

Before we begin, let’s start by installing Galera Manager on the machine that will act as the management node. Galera Manager is a web-based application, so it doesn’t require any additional client installations.

To install Galera Manager:

1. Download the Galera Manager package from the official website.
2. Extract the downloaded package to a directory of your choice.
3. Start the Galera Manager server by executing the galera-manager command in the extracted directory.

Adding Cluster Nodes

Once Galera Manager is up and running, we can start adding cluster nodes to be managed. To add a cluster node:

1. Open your web browser and navigate to the Galera Manager URL (e.g., http://localhost:8888).
2. Click on the “Cluster” tab on the top menu.
3. Click on the “Add a node” button.
4. Enter the necessary information for the node, including its name, IP address, and SSH credentials.
5. Click on the “Test connection” button to verify connectivity to the node.
6. If the test is successful, click on the “Add this node” button to add it to the cluster.

Repeat these steps for each node you want to add to the cluster.

Configuring Cluster Nodes

Galera Manager also provides features to configure cluster nodes easily. To configure a cluster node:

1. Select the cluster node you want to configure from the “Node” tab.
2. Click on the “Configuration” subtab.
3. Modify the required parameters, such as the database server binary path, MariaDB or MySQL version, and other Galera Cluster-specific settings.
4. Click on the “Apply changes” button to save the configuration.

Galera Manager will automatically distribute and apply the updated configuration to the selected cluster node.

Monitoring Cluster Health

Monitoring the health of the cluster is crucial to ensure its reliability and performance. Galera Manager provides comprehensive monitoring capabilities to track the status and performance of cluster nodes. To monitor the cluster:

1. Click on the “Overview” tab on the top menu.
2. The “Cluster Summary” section provides an overview of the cluster’s health, including the number of nodes, cluster state, and replication status.
3. Navigate through different tabs like “Node States,” “Galera Replication,” and “Cluster Status” to get detailed information about the cluster and its nodes.

Additionally, Galera Manager offers real-time monitoring metrics, such as CPU usage, memory utilization, and network traffic, to help identify and troubleshoot performance bottlenecks.

Conclusion

Galera Manager simplifies the process of configuring and managing cluster nodes in SQL Galera Cluster, offering a user-friendly interface and centralized control over the cluster. With its intuitive features for adding nodes, configuring settings, and monitoring cluster health, Galera Manager provides an efficient way to ensure the availability and reliability of your Galera Cluster deployment.

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