[cloud-mongodb-statefulset]: codelab needs updating

[dusty]

When running this codelab, the replica set is not created. The sidecar showed the following

Error in workloop { [Error: [object Object]]
  message:
   { kind: 'Status',
     apiVersion: 'v1',
     metadata: {},
     status: 'Failure',
     message:
      'pods is forbidden: User "system:serviceaccount:default:default" cannot list pods at the cluster scope',
     reason: 'Forbidden',
     details: { kind: 'pods' },
     code: 403 },
  statusCode: 403 }

It appears to be related to

https://github.com/cvallance/mongo-k8s-sidecar/issues/75

I added the following and that message went away

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: default-view
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: view
subjects:
  - kind: ServiceAccount
    name: default
    namespace: default

Then the sidecar was providing an error about connecting to mongo

Error in workloop { MongoError: failed to connect to server [10.4.0.13:27017] on first connect [MongoError: connect ECONNREFUSED 10.4.0.13:27017]
    at Pool.<anonymous> (/opt/cvallance/mongo-k8s-sidecar/node_modules/mongodb-core/lib/topologies/server.js:336:35)
    at Pool.emit (events.js:182:13)
    at Connection.<anonymous> (/opt/cvallance/mongo-k8s-sidecar/node_modules/mongodb-core/lib/connection/pool.js:280:12)
    at Object.onceWrapper (events.js:273:13)
    at Connection.emit (events.js:182:13)
    at Socket.<anonymous> (/opt/cvallance/mongo-k8s-sidecar/node_modules/mongodb-core/lib/connection/connection.js:189:49)
    at Object.onceWrapper (events.js:273:13)
    at Socket.emit (events.js:182:13)
    at emitErrorNT (internal/streams/destroy.js:82:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:50:3)
  name: 'MongoError',
  message:
   'failed to connect to server [10.4.0.13:27017] on first connect [MongoError: connect ECONNREFUSED 10.4.0.13:27017]' }

It seems that it is because mongo by default only listens on 127.0.0.1. So, I updated the mongo-statefulset.yaml file to include a bind_ip arg.

#   Copyright 2016, Google, Inc.
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http:#www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
---
apiVersion: v1
kind: Service
metadata:
  name: mongo
  labels:
    name: mongo
spec:
  ports:
  - port: 27017
    targetPort: 27017
  clusterIP: None
  selector:
    role: mongo
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: mongo
spec:
  serviceName: "mongo"
  replicas: 3
  template:
    metadata:
      labels:
        role: mongo
        environment: test
    spec:
      terminationGracePeriodSeconds: 10
      containers:
        - name: mongo
          image: mongo
          command:
            - mongod
            - "--replSet"
            - rs0
            - "--smallfiles"
            - "--noprealloc"
            - "--bind_ip"
            - "0.0.0.0"
          ports:
            - containerPort: 27017
          volumeMounts:
            - name: mongo-persistent-storage
              mountPath: /data/db
        - name: mongo-sidecar
          image: cvallance/mongo-k8s-sidecar
          env:
            - name: MONGO_SIDECAR_POD_LABELS
              value: "role=mongo,environment=test"
  volumeClaimTemplates:
  - metadata:
      name: mongo-persistent-storage
      annotations:
        volume.beta.kubernetes.io/storage-class: "fast"
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 100Gi

Then it worked.

[CalvinWong-Reflektion]

i am still getting this error. and this -

──── kubectl logs pod/mongo-0 mongo
Error parsing command line: unrecognised option '--smallfiles'
try 'mongod --help' for more information

──── kubectl logs pod/mongo-0 mongo-sidecar
...
Error in workloop { MongoError: failed to connect to server [127.0.0.1:27017] on first connect [MongoError: connect ECONNREFUSED 127.0.0.1:27017]
    at Pool.<anonymous> (/opt/cvallance/mongo-k8s-sidecar/node_modules/mongodb-core/lib/topologies/server.js:336:35)
    at Pool.emit (events.js:182:13)
    at Connection.<anonymous> (/opt/cvallance/mongo-k8s-sidecar/node_modules/mongodb-core/lib/connection/pool.js:280:12)
    at Object.onceWrapper (events.js:273:13)
    at Connection.emit (events.js:182:13)
    at Socket.<anonymous> (/opt/cvallance/mongo-k8s-sidecar/node_modules/mongodb-core/lib/connection/connection.js:189:49)
    at Object.onceWrapper (events.js:273:13)
    at Socket.emit (events.js:182:13)
    at emitErrorNT (internal/streams/destroy.js:82:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:50:3)
  name: 'MongoError',
  message:
   'failed to connect to server [127.0.0.1:27017] on first connect [MongoError: connect ECONNREFUSED 127.0.0.1:27017]' }

[CalvinWong-Reflektion]

i am still getting this error. and this -

──── kubectl logs pod/mongo-0 mongo
Error parsing command line: unrecognised option '--smallfiles'
try 'mongod --help' for more information

──── kubectl logs pod/mongo-0 mongo-sidecar
...
Error in workloop { MongoError: failed to connect to server [127.0.0.1:27017] on first connect [MongoError: connect ECONNREFUSED 127.0.0.1:27017]
    at Pool.<anonymous> (/opt/cvallance/mongo-k8s-sidecar/node_modules/mongodb-core/lib/topologies/server.js:336:35)
    at Pool.emit (events.js:182:13)
    at Connection.<anonymous> (/opt/cvallance/mongo-k8s-sidecar/node_modules/mongodb-core/lib/connection/pool.js:280:12)
    at Object.onceWrapper (events.js:273:13)
    at Connection.emit (events.js:182:13)
    at Socket.<anonymous> (/opt/cvallance/mongo-k8s-sidecar/node_modules/mongodb-core/lib/connection/connection.js:189:49)
    at Object.onceWrapper (events.js:273:13)
    at Socket.emit (events.js:182:13)
    at emitErrorNT (internal/streams/destroy.js:82:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:50:3)
  name: 'MongoError',
  message:
   'failed to connect to server [127.0.0.1:27017] on first connect [MongoError: connect ECONNREFUSED 127.0.0.1:27017]' }

looks like i have to use version 4.0 - https://stackoverflow.com/questions/57492145/error-when-creating-a-mongodb-replicaset-shows-unrecognized-option-smallfil

[adityakar]

Thank you @dusty! This was really helpful. I wish I had found your post sooner. I wasted a few hours trying to figure out all the issues and then found this post when I was stuck with the connection refused issue from the sidecar.