Failed to connect mongo-express to mongoDb in k8s - mongodb

Question

I configured mongodb with user name and password, and deployed mongoDb and mongoDb express.
The problem is that I'm getting the following error in mongo-express logs:
Could not connect to database using connectionString: mongodb://username:password#mongodb://lc-mongodb-service:27017:27017/"
I can see that the connection string contains 27017 port twice, and also "mongodb://" in the middle that should not be there.
This is my mongo-express deployment:
apiVersion: apps/v1
kind: Deployment
metadata:
name: lc-mongo-express
labels:
app: lc-mongo-express
spec:
replicas: 1
selector:
matchLabels:
app: lc-mongo-express
template:
metadata:
labels:
app: lc-mongo-express
spec:
containers:
- name: lc-mongo-express
image: mongo-express
ports:
- containerPort: 8081
env:
- name: ME_CONFIG_MONGODB_SERVER
valueFrom:
configMapKeyRef:
name: lc-configmap
key: DATABASE_URL
- name: ME_CONFIG_MONGODB_ADMINUSERNAME
valueFrom:
secretKeyRef:
name: lc-secret
key: MONGO_ROOT_USERNAME
- name: ME_CONFIG_MONGODB_ADMINPASSWORD
valueFrom:
secretKeyRef:
name: lc-secret
key: MONGO_ROOT_PASSWORD
---
apiVersion: v1
kind: Service
metadata:
name: lc-mongo-express-service
spec:
selector:
app: lc-mongo-express
type: LoadBalancer
ports:
- protocol: TCP
port: 8081
targetPort: 8081
And my mongoDb deployment:
---
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
name: lc-mongodb-pvc
spec:
accessModes:
- ReadWriteOnce
resources:
requests:
storage: 1Gi
volumeMode: Filesystem
storageClassName: gp2
---
apiVersion: apps/v1
kind: StatefulSet
metadata:
name: lc-mongodb
labels:
app: lc-mongodb
spec:
replicas: 1
serviceName: lc-mongodb-service
selector:
matchLabels:
app: lc-mongodb
template:
metadata:
labels:
app: lc-mongodb
spec:
volumes:
- name: lc-mongodb-storage
persistentVolumeClaim:
claimName: lc-mongodb-pvc
containers:
- name: lc-mongodb
image: "mongo"
ports:
- containerPort: 27017
env:
- name: MONGO_INITDB_ROOT_USERNAME
valueFrom:
secretKeyRef:
name: lc-secret
key: MONGO_ROOT_USERNAME
- name: MONGO_INITDB_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: lc-secret
key: MONGO_ROOT_PASSWORD
command:
- mongod
- --auth
volumeMounts:
- mountPath: '/data/db'
name: lc-mongodb-storage
---
apiVersion: v1
kind: Service
metadata:
name: lc-mongodb-service
labels:
name: lc-mongodb
spec:
selector:
app: lc-mongodb
ports:
- protocol: TCP
port: 27017
targetPort: 27017
What am I doing wrong?

Answer 1

Your connection string format is wrong
You should be trying out something like
mongodb://[username:password#]host1[:port1][,...hostN[:portN]][/[defaultauthdb][?options]]
Now suppose if you are using the Node js
const MongoClient = require('mongodb').MongoClient;
const uri = "mongodb+srv://<username>:<password>#<Mongo service Name>/<Database name>?retryWrites=true&w=majority";
const client = new MongoClient(uri, { useNewUrlParser: true });
client.connect(err => {
// creating collection
const collection = client.db("test").collection("devices");
// perform actions on the collection object
client.close();
});
also you missing the Db path args: ["--dbpath","/data/db"] in command while using the PVC and configuring the path
apiVersion: apps/v1
kind: Deployment
metadata:
creationTimestamp: null
labels:
app: mongo
name: mongo
spec:
replicas: 1
selector:
matchLabels:
app: mongo
strategy: {}
template:
metadata:
creationTimestamp: null
labels:
app: mongo
spec:
containers:
- image: mongo
name: mongo
args: ["--dbpath","/data/db"]
livenessProbe:
exec:
command:
- mongo
- --disableImplicitSessions
- --eval
- "db.adminCommand('ping')"
initialDelaySeconds: 30
periodSeconds: 10
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 6
readinessProbe:
exec:
command:
- mongo
- --disableImplicitSessions
- --eval
- "db.adminCommand('ping')"
initialDelaySeconds: 30
periodSeconds: 10
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 6
env:
- name: MONGO_INITDB_ROOT_USERNAME
valueFrom:
secretKeyRef:
name: mongo-creds
key: username
- name: MONGO_INITDB_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mongo-creds
key: password
volumeMounts:
- name: "mongo-data-dir"
mountPath: "/data/db"
volumes:
- name: "mongo-data-dir"
persistentVolumeClaim:
claimName: "pvc"