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Percona Operator for MySQL 0.8.0

Percona Operator for MySQL allows users to deploy MySQL clusters with both asynchronous and group replication topology. This release includes various stability improvements and bug fixes, getting the Operator closer to the General Availability stage. Version 0.8.0 of the Percona Operator for MySQL is still a tech preview release and it is not recommended for production environments. As of today, we recommend using Percona Operator for MySQL based on Percona XtraDB Cluster, which is production-ready and contains everything you need to quickly and consistently deploy and scale MySQL clusters in a Kubernetes-based environment, on-premises or in the cloud.

Highlights

Supporting cluster-wide Operator installation

Starting from now, the Operator can be installed in multi-namespace (so-called “cluster-wide”) mode, enabling management of Percona Server for MySQL clusters across multiple namespaces from a single Operator. This functionality, already available for other Percona Operators, brings greater flexibility and efficiency to managing MySQL databases on Kubernetes.

Fixing the overloaded allowUnsafeConfigurations flag

In the previous Operator versions allowUnsafeConfigurations Custom Resource option was used to allow configuring a cluster with unsafe parameters, such as starting it with unsafe number of MySQL or proxy instances. In fact, setting this option to true resulted in a wide range of reduced safety features without the user’s explicit intent.

With this release, a separate unsafeFlags Custom Resource section is introduced for the fine-grained control of the safety loosening features:

unsafeFlags:
  mysqlSize: true
  proxy: true
  proxySize: true
  orchestrator: true
  orchestratorSize: true

New features

Improvements

  • K8SPS-334: Finalizers were renamed to contain fully qualified domain names (FQDNs), avoiding potential conflicts with other finalizer names in the same Kubernetes environment
  • K8SPS-333: improve delete-mysql-pods-in-order finalizer to take into account possible change of the primary instance in group replication
  • K8SPS-340: A securityContext of the xtrabackup container can now be configured allowing administrators to define security profiles for the container
  • K8SPS-43: Custom Resource status obtained with the kubectl get ps command now takes into account both group and asynchronous replication, and doesn’t report the cluster as ready if the replication is broken

Bugs Fixed

  • K8SPS-366: Fix a bug where cluster deletion caused the Operator panic due to querying a non-existing Custom Resource
  • K8SPS-346: Fix a bug where the cluster started with 1 node and dataset bigger than 100 GB was unable to scale up because of too short bootstrap timeout
  • K8SPS-341: Fix a bug where failed backup deletion got stuck because of being blocked by the delete-backup finalizer
  • K8SPS-310: TLS certificate and issuer names generated by the Operator are now aligned with other Percona Operators to streamline coherent user experience
  • K8SPS-301: Fix a bug that caused multiple error messages to appear in logs on MySQL Pod deletion
  • K8SPS-307: Fix a bug where updating database with SmartUpdate strategy didn’t produce log messages about updated primary Pod and about finishing the update process

Deprecation and removal

  • Starting from now, allowUnsafeConfigurations Custom Resource option is deprecated in favor of a number of options under the unsafeFlags subsection. Setting allowUnsafeConfigurations won’t have any effect; upgrading existing clusters with allowUnsafeConfigurations=true will cause everything under unsafeFlags set to true

  • Finalizers were renamed to contain fully qualified domain names:

    • delete-mysql-pods-in-order renamed to percona.com/delete-mysql-pods-in-order
    • delete-ssl renamed to percona.com/delete-ssl
    • delete-backup renamed to percona.com/delete-backup

Supported Platforms

The Operator was developed and tested with Percona Server for MySQL 8.0.36-28. Other options may also work but have not been tested. Other software components include:

  • Orchestrator 3.2.6-12
  • MySQL Router 8.0.36
  • XtraBackup 8.0.35-31
  • Percona Toolkit 3.6.0
  • HAProxy 2.8.5
  • PMM Client 2.42.0

The following platforms were tested and are officially supported by the Operator 0.8.0:

This list only includes the platforms that the Percona Operators are specifically tested on as part of the release process. Other Kubernetes flavors and versions depend on backward compatibility offered by Kubernetes itself.

Get expert help

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Last update: 2024-08-08