Containers are great for scaling stateless services and making them robust. However, stateful services like databases continue to pose challenges. In particular, upgrading a running database service to a new version with near zero downtime is not trivial. Wouldn't it be great if a helm chart or K8S operator could automatically take care of this for you? This would allow you to fire up a database in your K8S cluster and consume it as-a-service. And put us one step closer to building a private cloud that runs anywhere, powered by pure open source.
Goal for this Hackweek
- Boot up an Amazon Kubernetes Service instance, deploy Rancher and register the cluster with Rancher
- Install a helm chart for an older version of a stateful service on the cluster, e.g. MariaDB, PostgreSQL, MongoDB or similar
- Put some data into the service and run a simulated load on it
- Naively upgrade the service to a newer version via helm and observe what, if anything, breaks
- Read database vendor instructions how human operators can achieve near zero downtime upgrades of the service
- Try and script these instructions to perform an automatic near zero downtime upgrade on the cluster
- Try and derive a general framework for near zero downtime upgrades of arbitrary stateful services (maybe as an extension to helm; needs to offer the right kind of service-specific extension points)
- Starting as an independent exploration
- Happy for anyone interested in Rancher, MariaDB and Helm to join!
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