MongoDb ImagePullBackOff error in Kubernetes despite trying every SOF solution - docker

Question

I'm using minikube on a Fedora based machine to run a simple mongo-db deployment on my local machine but I'm constantly getting ImagePullBackOff error. Here is the yaml file:
apiVersion: apps/v1
kind: Deployment
metadata:
name: mongodb-deployment
labels:
app: mongodb
spec:
replicas: 1
selector:
matchLabels:
app: mongodb
template:
metadata:
labels:
app: mongodb
spec:
containers:
- name: mongodb
image: mongo
ports:
- containerPort: 27017
env:
- name: MONGO_INITDB_ROOT_USERNAME
valueFrom:
secretKeyRef:
name: mongodb-secret
key: mongo-root-username
- name: MONGO_INITDB_ROOT_PASSWORD
valueFrom:
secretKeyRef:
name: mongodb-secret
key: mongo-root-password
apiVersion: v1
kind: Service
metadata:
name: mongodb-service
spec:
selector:
app: mongodb
ports:
- protocol: TCP
port: 27017
targetPort: 27017
I tried to pull the image locally by using docker pull mongo, minikube image pull mongo & minikube image pull mongo-express several times while restarting docker and minikube several times.
Logining into dockerhub (both in broweser and through terminal didn't work)
I also tried to login into docker using docker login command and then modified my /etc/resolv.conf and adding nameserver 8.8.8.8 and then restartied docker using sudo systemctl restart docker but even that failed to work.
On running kubectl describe pod command I get this output:
Name: mongodb-deployment-6bf8f4c466-85b2h
Namespace: default
Priority: 0
Node: minikube/192.168.49.2
Start Time: Mon, 29 Aug 2022 23:04:12 +0530
Labels: app=mongodb
pod-template-hash=6bf8f4c466
Annotations: <none>
Status: Pending
IP: 172.17.0.2
IPs:
IP: 172.17.0.2
Controlled By: ReplicaSet/mongodb-deployment-6bf8f4c466
Containers:
mongodb:
Container ID:
Image: mongo
Image ID:
Port: 27017/TCP
Host Port: 0/TCP
State: Waiting
Reason: ImagePullBackOff
Ready: False
Restart Count: 0
Environment:
MONGO_INITDB_ROOT_USERNAME: <set to the key 'mongo-root-username' in secret 'mongodb-secret'>
Optional: false
MONGO_INITDB_ROOT_PASSWORD: <set to the key 'mongo-root-password' in secret 'mongodb-secret'>
Optional: false
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-vlcxl (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
kube-api-access-vlcxl:
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 22m default-scheduler Successfully assigned default/mongodb-deployment-6bf8f4c466-85b2h to minikube
Warning Failed 18m (x2 over 20m) kubelet Failed to pull image "mongo:latest": rpc error: code = Unknown desc = context deadline exceeded
Warning Failed 18m (x2 over 20m) kubelet Error: ErrImagePull
Normal BackOff 17m (x2 over 20m) kubelet Back-off pulling image "mongo:latest"
Warning Failed 17m (x2 over 20m) kubelet Error: ImagePullBackOff
Normal Pulling 17m (x3 over 22m) kubelet Pulling image "mongo:latest"
Normal SandboxChanged 11m kubelet Pod sandbox changed, it will be killed and re-created.
Normal Pulling 3m59s (x4 over 11m) kubelet Pulling image "mongo:latest"
Warning Failed 2m (x4 over 9m16s) kubelet Failed to pull image "mongo:latest": rpc error: code = Unknown desc = context deadline exceeded
Warning Failed 2m (x4 over 9m16s) kubelet Error: ErrImagePull
Normal BackOff 83s (x7 over 9m15s) kubelet Back-off pulling image "mongo:latest"
Warning Failed 83s (x7 over 9m15s) kubelet Error: ImagePullBackOff
PS: Ignore any any spacing errors

Answer 1

I think your internet connection is slow. The timeout to pull an image is 120 seconds, so kubectl could not pull the image in under 120 seconds.
First, pull the image via Docker
docker image pull mongo
Then load the downloaded image to minikube
minikube image load mongo
And then everything will work because now kubectl will use the image that is stored locally.