Unable to connect to MongoDB: MongoNetworkError & MongoNetworkError connecting to kubernetis MongoDB pod with mongoose - node.js

Question

I am trying to connect to MongoDB in a microservice-based project using NodeJs, Kubernetes, Ingress, and skaffold.
I got two errors on doing skaffold dev:
MongoNetworkError: failed to connect to server [auth-mongo-srv:21017] on first connect [MongoNetworkTimeoutError: connection timed out.
Mongoose default connection error: MongoNetworkError: MongoNetworkError: failed to connect to server [auth-mongo-srv:21017] on first connect [MongoNetworkTimeoutError: connection timed out at connectionFailureError.
My auth-mongo-deploy.yaml:
apiVersion: apps/v1
kind: Deployment
metadata:
name: auth-mongo-deploy
spec:
replicas: 1
selector:
matchLabels:
app: auth-mongo
template:
metadata:
labels:
app: auth-mongo
spec:
containers:
- name: auth-mongo
image: mongo
---
apiVersion: v1
kind: Service
metadata:
name: auth-mongo-srv
spec:
selector:
app: auth-mongo
ports:
- name: db
protocol: TCP
port: 27017
targetPort: 27017
My server.ts
const dbURI: string = "mongodb://auth-mongo-srv:21017/auth"
logger.debug(dbURI)
logger.info('connecting to database...')
// changing {} --> options change nothing!
mongoose.connect(dbURI, {}).then(() => {
logger.info('Mongoose connection done')
app.listen(APP_PORT, () => {
logger.info(`server listening on ${APP_PORT}`)
})
console.clear();
}).catch((e) => {
logger.info('Mongoose connection error')
logger.error(e)
})
Additional information:
1. pod is created:
rhythm#vivobook:~/Documents/TicketResale/server$ kubectl get pods
NAME STATUS RESTARTS AGE
auth-deploy-595c6cbf6d-9wzt9 1/1 Running 0 5m53s
auth-mongo-deploy-6b96b7798c-9726w 1/1 Running 0 5m53s
tickets-deploy-675b7b9b58-f5bzs 1/1 Running 0 5m53s
2. pod description:
kubectl describe pod auth-mongo-deploy-6b96b7798c-9726w
Name: auth-mongo-deploy-694b67f76d-ksw82
Namespace: default
Priority: 0
Node: minikube/192.168.49.2
Start Time: Tue, 21 Jun 2022 14:11:47 +0530
Labels: app=auth-mongo
pod-template-hash=694b67f76d
skaffold.dev/run-id=2f5d2142-0f1a-4fa4-b641-3f301f10e65a
Annotations: <none>
Status: Running
IP: 172.17.0.2
IPs:
IP: 172.17.0.2
Controlled By: ReplicaSet/auth-mongo-deploy-694b67f76d
Containers:
auth-mongo:
Container ID: docker://fa43cd7e03ac32ed63c82419e5f9722deffd2f93206b6a0f2b25ae9be8f6cedf
Image: mongo
Image ID: docker-pullable://mongo#sha256:37e84d3dd30cdfb5472ec42b8a6b4dc6ca7cacd91ebcfa0410a54528bbc5fa6d
Port: <none>
Host Port: <none>
State: Running
Started: Tue, 21 Jun 2022 14:11:52 +0530
Ready: True
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-zw7s9 (ro)
Conditions:
Type Status
Initialized True
Ready True
ContainersReady True
PodScheduled True
Volumes:
kube-api-access-zw7s9:
Type: Projected (a volume that contains injected data from multiple sources)
TokenExpirationSeconds: 3607
ConfigMapName: kube-root-ca.crt
ConfigMapOptional: <nil>
DownwardAPI: true
QoS Class: BestEffort
Node-Selectors: <none>
Tolerations: node.kubernetes.io/not-ready:NoExecute op=Exists for 300s
node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
Type Reason Age From Message
---- ------ ---- ---- -------
Normal Scheduled 79s default-scheduler Successfully assigned default/auth-mongo-deploy-694b67f76d-ksw82 to minikube
Normal Pulling 79s kubelet Pulling image "mongo"
Normal Pulled 75s kubelet Successfully pulled image "mongo" in 4.429126953s
Normal Created 75s kubelet Created container auth-mongo
Normal Started 75s kubelet Started container auth-mongo
I have also tried:
kubectl describe service auth-mongo-srv
Name: auth-mongo-srv
Namespace: default
Labels: skaffold.dev/run-id=2f5d2142-0f1a-4fa4-b641-3f301f10e65a
Annotations: <none>
Selector: app=auth-mongo
Type: ClusterIP
IP Family Policy: SingleStack
IP Families: IPv4
IP: 10.100.42.183
IPs: 10.100.42.183
Port: db 27017/TCP
TargetPort: 27017/TCP
Endpoints: 172.17.0.2:27017
Session Affinity: None
Events: <none>
And then changed:
const dbURI: string = "mongodb://auth-mongo-srv:21017/auth" to
const dbURI: string = "mongodb://172.17.0.2:27017:21017/auth"
generated a different error of MongooseServerSelectionError.

Answer 1

const dbURI: string = "mongodb://auth-mongo-srv:27017/auth"