My helm chart has some 12 PODS. When I did helm upgrade
after changing some values all the PODs are restarted except for one.
My question is
you need delete the job first, and run
helm history <release_name>
helm rollback <release_name> <number> --recreate-pods
The flag --recreate-pods
was marked as deprecated in Helm 2 and was removed with Helm 3.
Helm suggests to either add checksums of other files which could have changed like this
annotations:
checksum/config: {{ include (print $.Template.BasePath "/configmap.yaml") . | sha256sum }}
or to add an annotation with a random number which forces an update on each rollout:
annotations:
rollme: {{ randAlphaNum 5 | quote }}
See Helm docs: https://v3.helm.sh/docs/howto/charts_tips_and_tricks/#automatically-roll-deployments
As far as I am concerned helm restart only the pods which are affected by upgrade
If You want to restart ALL pods you can use --recreate-pods flag
--recreate-pods -> performs pods restart for the resource if applicable
For example if You have dashboard chart, You can use this command to restart every pod.
helm upgrade --recreate-pods -i k8s-dashboard stable/k8s-dashboard
There is a github issue which provide another workaround for it
Every time you need to restart the pods, change the value of that annotation. A good annotation could be timestamp
First, add an annotation to the pod. If your chart is of kind Deployment, add annotation to spec.template.metadata.annotations. For example:
kind: Deployment
spec:
template:
metadata:
labels:
app: ecf-helm-satellite-qa
annotations:
timestamp: "{{ .Values.timestamp }}"
Deploy that. Now, every time you set timestamp in helm command. Kubernetes will rollout a new update without downtime.
helm upgrade ecf-helm-satellite-qa . --set-string timestamp=a_random_value
--recreate-pods
has been removed in helm 3 and that certainly got the attention of some helm users.
I force the pods to be recreated using a timestamp in the deployment pod spec. Note that it has to be in the spec, this will not work at the deployment top level:
spec:
template:
metadata:
annotations:
releaseTime: {{ dateInZone "2006-01-02 15:04:05Z" (now) "UTC"| quote }}