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fix(chart): Fix gitops-incompatible random rolling (#20184) 

This patch reworks the Pod rolling mechanism, which is supposed to update Pods
with each migration run, but since the it generates a new random value on each
helm execution, this will constantly roll all pods in a GitOps driven deployment,
which reconciles the helm release.

This is resolved by fixing the upgrade to the `.Release.Revision`, which should
stay identical, unless config or helm release version have been changed. Further
it introduces automatic rolls based on adjustments to the environment variables
and secrets.

The implementation uses a helper template, following the 1-2-N rule, and omitting
code duplication.

References:
https://helm.sh/docs/chart_template_guide/builtin_objects/
https://helm.sh/docs/howto/charts_tips_and_tricks/#automatically-roll-deployments
This commit is contained in:
Sheogorath 2022-11-10 19:10:38 +01:00 committed by GitHub
parent 86d4b6f7c9
commit e868f41923
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4 changed files with 19 additions and 8 deletions
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9
chart/templates/_helpers.tpl
View File

@ -51,6 +51,15 @@ app.kubernetes.io/name: {{ include "mastodon.name" . }}
app.kubernetes.io/instance: {{ .Release.Name }}
{{- end }}
{{/*
Rolling pod annotations
*/}}
{{- define "mastodon.rollingPodAnnotations" -}}
rollme: {{ .Release.Revision | quote }}
checksum/config-secrets: {{ include ( print $.Template.BasePath "/secrets.yaml" ) . | sha256sum | quote }}
checksum/config-configmap: {{ include ( print $.Template.BasePath "/configmap-env.yaml" ) . | sha256sum | quote }}
{{- end }}
{{/*
Create the name of the service account to use
*/}}

8
chart/templates/deployment-sidekiq.yaml
View File

@ -16,11 +16,11 @@ spec:
template:
metadata:
annotations:
{{- with .Values.podAnnotations }}
{{- with .Values.podAnnotations }}
{{- toYaml . | nindent 8 }}
{{- end }}
# roll the pods to pick up any db migrations
rollme: {{ randAlphaNum 5 | quote }}
{{- end }}
# roll the pods to pick up any db migrations or other changes
{{- include "mastodon.rollingPodAnnotations" . | nindent 8 }}
labels:
{{- include "mastodon.selectorLabels" . | nindent 8 }}
app.kubernetes.io/component: sidekiq

6
chart/templates/deployment-streaming.yaml
View File

@ -14,10 +14,12 @@ spec:
app.kubernetes.io/component: streaming
template:
metadata:
{{- with .Values.podAnnotations }}
annotations:
{{- with .Values.podAnnotations }}
{{- toYaml . | nindent 8 }}
{{- end }}
{{- end }}
# roll the pods to pick up any db migrations or other changes
{{- include "mastodon.rollingPodAnnotations" . | nindent 8 }}
labels:
{{- include "mastodon.selectorLabels" . | nindent 8 }}
app.kubernetes.io/component: streaming

4
chart/templates/deployment-web.yaml
View File

@ -19,8 +19,8 @@ spec:
{{- with .Values.podAnnotations }}
{{- toYaml . | nindent 8 }}
{{- end }}
# roll the pods to pick up any db migrations
rollme: {{ randAlphaNum 5 | quote }}
# roll the pods to pick up any db migrations or other changes
{{- include "mastodon.rollingPodAnnotations" . | nindent 8 }}
labels:
{{- include "mastodon.selectorLabels" . | nindent 8 }}
app.kubernetes.io/component: web