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Percona Operator for MySQL 0.3.0

Note

Version 0.3.0 of the Percona Operator for MySQL is 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.

Release Highlights

  • You can now use the HAProxy load balancer in front of the cluster configured for the asynchronous replication. The feature is turned on by default, allowing HAProxy to route traffic and monitor the health of the nodes

  • Starting from this release, the Operator automatically generates TLS certificates and turns on transport encryption by default at cluster creation time. This includes both external certificates which allow users to connect to a cluster via the encrypted channel, and internal ones used for communication between MySQL nodes

New Features

  • K8SPS-17 The new sidecar container for MySQL Pods integrates the Percona Toolkit’s pt-heartbeat tool, which provides reliable monitoring of the MySQL replication lag and allows Orchestrator to block primary promotion of the extra slow instances (ones with the lag greater than 10 minutes)
  • K8SPS-105 Provide the backup and restore functionality for clusters with Group Replication
  • K8SPS-112 Use HAProxy to simplify the exposure and enable load balancing for the asynchronous MySQL cluster

Improvements

  • K8SPS-23 Add cert-manager support to generate and update TLS certificates automatically
  • K8SPS-31 Show ready state in the custom resource output produced by the kubectl get ps command only after all LoadBalancers are ready
  • K8SPS-59 Add mysql.primaryServiceType Custom Resource option to configure the primary exposure type in one place instead of exposing all Pods with specific Service type
  • K8SPS-88 Allow configuring prefix field for backup storages via the backup.s3.prefix Custom Resource option
  • K8SPS-93 Avoid running multiple backups on the same Pod by either scheduling new backup to another Node or blocking it until the running one finishes
  • K8SPS-97 S3 backup finalizer now triggers the actual deletion of backup files from the S3 bucket when there is a manual or scheduled removal of the corresponding backup object
  • K8SPS-103 Show MySQL Router and Orchestrator statuses in the Custom Resource through the kubectl command
  • K8SPS-104 Avoid using the root user in backup containers to run XtraBackup with the lowest possible privileges for higher security and isolation of the cluster components
  • K8SPS-115 Make it possible to use API Key to authorize within Percona Monitoring and Management Server as a more convenient and modern alternative password-based authentication
  • K8SPS-119 and K8SPS-150 Allow to specify custom init images for the cluster components (MySQL, Orchestrator, Router, HAProxy, etc.) to simplify customizing images by the end users
  • K8SPS-138 Expose MySQL default and administrative connection ports via MySQL Router
  • K8SPS-145 Add delete-mysql-pods-in-order finalizer to control the proper Pods deletion order in case of the cluster deletion event
  • K8SPS-152 Allow configuring the Orchestrator exposure via the orchestrator.expose.type option in Custom Resource

Bugs Fixed

  • K8SPS-91 Fix a bug that caused backups to run even if user disabled them
  • K8SPS-92 Fixed a bug where backup did not throw error in logs in case of incorrect S3 credentials, making the impression that everything is working fine
  • K8SPS-114 Fix a bug due to which setting primaryServiceType to LoadBalancer with asynchronous replication resulted in no STATE and ENDPOINT in the custom resource output produced by the kubectl get ps command
  • K8SPS-121 Fix a bug where XtraBackup process erroneously continued running on the appropriate Node instead of being killed on backup Pod termination, e.g. with kubectl delete ps-backup command
  • K8SPS-125 Fix a bug where the Operator was erroneously removing cluster Secret in case of the Custom Resource deletion, causing change of all passwords if user creates the new one
  • K8SPS-132 Fix a bug which made MySQL client quickly reaching connections limit on EKS due to the large number of connection attempts done by the AWS healthchecks that could not access MySQL Router

Deprecation and removal

  • K8SPS-49 The clustercheck system user was removed and is no longer automatically created by default; starting from now, the monitor user is used for probes-related functionality

Supported Platforms

The following platforms were tested and are officially supported by the Operator 0.3.0:

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.

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Last update: 2024-04-02