Since the initial implementation of RunnerDeployment and until this change, any update to a runner deployment has been leaving old runner replicasets until the next resync interval. This fixes that, by continusouly retrying the reconcilation 10 seconds later to see if there are any old runner replicasets that can be removed.
In addition to that, the cleanup of old runner replicasets has been improved to be deferred until all the runners of the newest replica set to be available. This gives you hopefully zero or at less downtime updates of runner deployments.
Fixes#24
I had observed athe exact issue seen for the 4th option described in https://github.com/elastic/cloud-on-k8s/issues/1822, which resulted in actions-runner-controller is unable to create nor update runners. This fixes that.
I've also updated README to introduce RunnerDeployment and manually tested it to work after the fix.
---
`actions-runner-controller` has been failing while creating and updating runners:
```
2020-03-05T11:05:16.610+0900 ERROR controllers.Runner Failed to update runner {"runner": "default/example-runner", "error": "Runner.actions.summerwind.dev \"example-runner\" is invalid: []: Invalid value: map[string]interface {}{\"apiVersion\":\"actions.summerwind.dev/v1alpha1\", \"kind\":\"Runner\", \"metadata\":map[string]interface {}{\"creationTimestamp\":\"2020-03-05T02:05:16Z\", \"finalizers\":[]interface {}{\"runner.actions.summerwind.dev\"}, \"generation\":2, \"name\":\"example-runner\", \"namespace\":\"default\", \"resourceVersion\":\"911496\", \"selfLink\":\"/apis/actions.summerwind.dev/v1alpha1/namespaces/default/runners/example-runner\", \"uid\":\"48b62d07-ff2c-42d6-878c-d3f951202209\"}, \"spec\":map[string]interface {}{\"env\":interface {}(nil), \"image\":\"\", \"repository\":\"mumoshu/actions-runner-controller-ci\"}}: validation failure list:\nspec.env in body must be of type array: \"null\""}
github.com/go-logr/zapr.(*zapLogger).Error
/Users/c-ykuoka/go/pkg/mod/github.com/go-logr/zapr@v0.1.0/zapr.go:128
github.com/summerwind/actions-runner-controller/controllers.(*RunnerReconciler).Reconcile
/Users/c-ykuoka/p/actions-runner-controller/controllers/runner_controller.go:88
```
This seems like the exact issue seen in the 4th option in https://github.com/elastic/cloud-on-k8s/issues/1822
I also observed the same issue is failing while the runnerset controller is trying to create/update runners:
```
Also while creating runner in the runnerset controller:
2020-03-05T11:15:01.223+0900 ERROR controller-runtime.controller Reconciler error {"controller": "runnerset", "request": "default/example-runnerset", "error": "Runner.actions.summerwind.dev \"example-runnersetgp56m\" is invalid: []: Invalid value: map[string]interface {}{\"apiVersion\":\"actions.summerwind.dev/v1alpha1\", \"kind\":\"Runner\", \"metadata\":map[string]interface {}{\"creationTimestamp\":\"2020-03-05T02:15:01Z\", \"generateName\":\"example-runnerset\", \"generation\":1, \"name\":\"example-runnersetgp56m\", \"namespace\":\"default\", \"ownerReferences\":[]interface {}{map[string]interface {}{\"apiVersion\":\"actions.summerwind.dev/v1alpha1\", \"blockOwnerDeletion\":true, \"controller\":true, \"kind\":\"RunnerSet\", \"name\":\"example-runnerset\", \"uid\":\"e26f7d01-3168-496d-931b-8e6f97b776ea\"}}, \"uid\":\"4ee490f5-9a8c-4f30-86f9-61dea799b972\"}, \"spec\":map[string]interface {}{\"env\":interface {}(nil), \"image\":\"\", \"repository\":\"mumoshu/actions-runner-controller-ci\"}}: validation failure list:\nspec.env in body must be of type array: \"null\""}
github.com/go-logr/zapr.(*zapLogger).Error
```
and while the runnerdeployment controller is trying to create/update runners.
I've fixed it so that the new `RunnerDeployment` example added to README just works.
Removes an unnecessary condition from the deployment controller code. We assumed that the client would return a not-found error on an empty runnerset list it is clearly not the case.
Adds the initial version of RunnerDeployment that is intended to manage RunnerSets(#1), like Deployment manages ReplicaSets.
This is the initial version and therefore is bare bone. The only update strategy it supports is `Recreate`, which recreates the underlying RunnerSet when the runner template changes. I'd like to add `RollingUpdate` strategy once this is merged.
This depends on #1 so the diff contains that of #1, too. Please see only the latest commit for review.
Also see https://github.com/mumoshu/actions-runner-controller-ci/runs/471329823?check_suite_focus=true to confirm that `make tests` is passing after changes made in this commit.
RunnerSet is basically ReplicaSet for Runners.
It is responsible for maintaining number of runners to match the desired one. That is, it creates missing runners from `.Spec.Template` and deletes redundant runners.
Similar to ReplicaSet, this does not support rolling update of runners on its own. We might want to later add `RunnerDeployment` for that. But that's another story.
