[bitnami/mongodb] support https://github.com/combor/k8s-mongo-labeler-sidecar - a very … (#6435)

bitnami/mongodb/Chart.yaml

@@ -26,4 +26,4 @@ name: mongodb
 sources:
   - https://github.com/bitnami/bitnami-docker-mongodb
   - https://mongodb.org
-version: 10.18.0
+version: 10.19.0

bitnami/mongodb/README.md

@@ -531,3 +531,37 @@ Use the workaround below to upgrade from versions previous to 5.0.0. The followi
 ```console
 $ kubectl delete statefulset my-release-mongodb-arbiter my-release-mongodb-primary my-release-mongodb-secondary --cascade=false
 ```
+
+### Add extra deployment options
+
+To add extra deployments (useful for advanced features like sidecars), use the `extraDeploy` property.
+
+In the example below, you can find how to use a example here for a [MongoDB replica set pod labeler sidecar](https://github.com/combor/k8s-mongo-labeler-sidecar) to identify the primary pod and dynamically label it as the primary node:
+
+```yaml
+extraDeploy:
+  - apiVersion: v1
+    kind: Service
+    metadata:
+      name: mongodb-primary
+      namespace: default
+      labels:
+        app.kubernetes.io/component: mongodb
+        app.kubernetes.io/instance: mongodb
+        app.kubernetes.io/managed-by: Helm
+        app.kubernetes.io/name: mongodb
+    spec:
+      type: NodePort
+      externalTrafficPolicy: Cluster
+      ports:
+        - name: mongodb-primary
+          port: 30001
+          nodePort: 30001
+          protocol: TCP
+          targetPort: mongodb
+      selector:
+        app.kubernetes.io/component: mongodb
+        app.kubernetes.io/instance: mongodb
+        app.kubernetes.io/name: mongodb
+        primary: "true"
+```

bitnami/mongodb/values.yaml

@@ -49,6 +49,33 @@ image:
 clusterDomain: cluster.local
 
 ## Extra objects to deploy (value evaluated as a template)
+## This needs to be uncommented and added to 'extraDeploy' in order to use the replicaset 'mongo-labeler' sidecar
+## for dynamically discovering the mongodb primary pod
+## suggestion is to use a hard-coded and predictable TCP port for the primary mongodb pod (here is 30001, choose your own)
+## - apiVersion: v1
+##   kind: Service
+##   metadata:
+##     name: mongodb-primary
+##     namespace: the-mongodb-namespace
+##     labels:
+##       app.kubernetes.io/component: mongodb
+##       app.kubernetes.io/instance: mongodb
+##       app.kubernetes.io/managed-by: Helm
+##       app.kubernetes.io/name: mongodb
+##   spec:
+##    type: NodePort
+##     externalTrafficPolicy: Cluster
+##     ports:
+##       - name: mongodb
+##         port: 30001
+##         nodePort: 30001
+##         protocol: TCP
+##         targetPort: mongodb
+##     selector:
+##       app.kubernetes.io/component: mongodb
+##       app.kubernetes.io/instance: mongodb
+##       app.kubernetes.io/name: mongodb
+##       primary: "true"
 ##
 extraDeploy: []
 
@@ -440,6 +467,22 @@ initContainers: {}
 ##     ports:
 ##       - name: portname
 ##         containerPort: 1234
+## This is an optional 'mongo-labeler' sidecar container that tracks replica-set for the primary mongodb pod
+## and labels it dynamically with ' primary: "true" ' in order for an extra-deployed service to always expose
+## and attach to the primary pod, this needs to be uncommented along with the suggested 'extraDeploy' example
+## and the suggested rbac example for the pod to be allowed adding labels to mongo replica pods
+## search 'mongo-labeler' through this file to find the sections that needs to be uncommented to make it work
+##
+## - name: mongo-labeler
+##   image: korenlev/k8s-mongo-labeler-sidecar
+##   imagePullPolicy: Always
+##   env:
+##     - name: LABEL_SELECTOR
+##       value: "app.kubernetes.io/component=mongodb,app.kubernetes.io/instance=mongodb,app.kubernetes.io/name=mongodb"
+##     - name: NAMESPACE
+##       value: "the-mongodb-namespace"
+##     - name: DEBUG
+##       value: "true"
 ##
 sidecars: {}
 
@@ -955,17 +998,20 @@ rbac:
   ## Specifies whether RBAC rules should be created
   ## binding MongoDB(R) ServiceAccount to a role
   ## that allows MongoDB(R) pods querying the K8s API
-  ##
+  ## this needs to be set to 'true' to enable the mongo-labeler sidecar primary mongodb discovery
   create: false
   role:
     ## Custom rules to create following the role specification
-    ## e.g.
+    ## The example below needs to be uncommented to use the 'mongo-labeler' sidecar for dynamic discovery of the primary mongodb pod:
     ## rules:
     ##   - apiGroups:
     ##       - ""
     ##     resources:
     ##       - pods
     ##     verbs:
+    ##       - get
+    ##       - list
+    ##       - watch
     ##       - update
     ##
     rules: []