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Maintenance guide

This is the maintenance guide for TopoLVM.

How to upgrade supported Kubernetes version

TopoLVM depends on some Kubernetes repositories like k8s.io/client-go and should support 3 consecutive Kubernets versions at a time. Here is the guide for how to upgrade the supported versions. Issues and PRs related to the last upgrade task also help you understand how to upgrade the supported versions, so checking them together with this guide is recommended when you do this task.

Check release notes

First of all, we should have a look at the release notes in the order below.

  1. Kubernetes
    • Choose the next version and check the release note. e.g. 1.17, 1.18, 1.19 -> 1.18, 1.19, 1.20
  2. controller-runtime
    • Read the release note, and check which version is compatible with the Kubernetes versions.
  3. CSI spec
    • Read the release note and check all the changes from the current version to the latest.
    • Basically, CSI spec should NOT be upgraded aggressively in this task. Upgrade the CSI version only if new features we should cover are introduced in newer versions, or the Kubernetes versions TopoLVM is going to support does not support the current CSI version.
    • For updating CSI spec, please remove csi.proto file then run make generate.
  4. CSI sidecars
    • TopoLVM does not use all the sidecars listed here. Have a look at csi-sidecars.mk first and understand what sidecars are actually being used.
    • Check the release pages of the sidecars under kubernetes-csi one by one and choose the latest version for each sidecar which satisfies both "Minimal Kubernetes version" and "Supported CSI spec versions". DO NOT follow the "Status and Releases" tables in this page and the README.md files in the sidecar repositories because they are sometimes not updated properly.
    • Read the change logs which are linked from the release pages.
    • Confirm diffs of RBAC between published in upstream and deploy/manifests/base/controller.yaml. And update it if required.
  5. Depending tools
    • They does not depend on other software, use latest versions.
    • They depend on kubernetes, use appropriate version associating to minimal supported kubernetes version by TopoLVM.

Please write down to the Github issue of this task what kinds of changes we find in the release note and what we are going to do and NOT going to do to address the changes. The format is up to you, but this is very important to keep track of what changes are made in this task, so please do not forget to do it.

Basically, we should pay attention to breaking changes and security fixes first. If we find some interesting features added in new versions, please consider if we are going to use them or not and make a GitHub issue to incorporate them after the upgrading task is done.

Update written versions

Once we decide the versions we are going to upgrade, we should update the versions written in the following files manually.

  • README.md: Documentation which indicates what versions are supported by TopoLVM
  • deploy/README.md: Documentation which instructs how to deploy TopoLVM on various versions of Kubernetes
  • csi-sidecars.mk: Makefile for building CSI sidecars
  • Makefile: Makefile for running e2e tests
  • e2e/Makefile: Makefile for running e2e tests
  • example/Makefile: Makefile for running example
  • charts/topolvm/Chart.yaml: Update the min Kubernetes version in kubeVersion

git grep 1.18, git grep image:, and git grep -i VERSION might help us avoid overlooking necessary changes. Please update the versions in the code and docs with great care.

Update CSI spec

To update the CSI version, we need to update CSI_VERSION in Makefile, and run the following commands.

$ make csi.proto
$ make generate

Update dependencies

Next, we should update go.mod by the following commands. Please note that Kubernetes v1 corresponds with v0 for the release tags. For example, v1.17.2 corresponds with the v0.17.2 tag.

$ VERSION=<upgrading Kubernetes release version>
$ go get k8s.io/api@v${VERSION} k8s.io/apimachinery@v${VERSION} k8s.io/client-go@v${VERSION}

If we need to upgrade the controller-runtime version, do the following as well.

$ VERSION=<upgrading controller-runtime version>
$ go get sigs.k8s.io/controller-runtime@v${VERSION}

Then, please tidy up the dependencies.

$ go mod tidy

These are minimal changes for the Kubernetes upgrade, but if there are some breaking changes found in the release notes, you have to handle them as well in this step.

Release the changes

We should follow RELEASE.md and upgrade the minor version.

Prepare for the next upgrade

We should create an issue for the next upgrade. Besides, Please update this document if we find something to be updated.