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Testing to See if You Can Run a MariaDB Cluster on a $150 Kubernetes Lab
- The article recounts the experience of running MariaDB on Kubernetes using Orange Pi 3 LTS boards, highlighting the hands-on approach and limitations of small physical devices.
- The author aimed to deploy MariaDB and Galera replication with the official MariaDB Kubernetes Operator, providing Ansible playbooks on GitHub for reference.
- The setup and configurations discussed in the article prioritize simplicity and brevity over best practices and security measures.
- Key steps include installing K3s with selective components, setting up the MariaDB Operator via Helm, and managing the MariaDB root password as a secret.
- Memory tuning was crucial due to limited resources, with adjustments made to parameters like innodb_buffer_pool_size and connection limits to prevent failures.
- Galera Cluster deployment required additional configuration and patience, emphasizing the importance of probe thresholds and allowing the cluster to sync gradually.
- The article details deployment manifests for a single MariaDB instance and a 3-node Galera cluster, along with performance checks to confirm replication.
- Lessons learned include the automation capabilities of the MariaDB Operator, resource handling on limited hardware, and the significance of monitoring and tuning for stability.
- The test environment showcased the potential of the MariaDB Kubernetes Operator for managing StatefulSets, volumes, and cluster state efficiently.
- While not suitable for production, the experiment provides valuable insights into deploying databases on resource-constrained environments with Kubernetes.
- The operator's capabilities extend beyond basic deployments, offering features like multiple HA modes, storage configuration, backup management, and TLS certificate handling.
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