Kind kubernetes cluster failed to pull docker images - docker

Question

I tried to use KinD as an alternative of Minikube to bootstrap a K8S cluster in my local machine.
The cluster is created successfully.
But when I tried to create some pods/deployments from images, it failed.
$ kubectl run nginx --image=nginx
$ kubectl run hello --image=hello-world
After some minutes, use get pods to get a failed status.
$ kubectl get pods
NAME READY STATUS RESTARTS AGE
hello 0/1 ImagePullBackOff 0 11m
nginx 0/1 ImagePullBackOff 0 22m
I am afraid this is another Global Firewall problem in China.
kubectl describe pods/nginx
Name: nginx
Namespace: default
Priority: 0
Node: dev-control-plane/172.19.0.2
Start Time: Sun, 30 Aug 2020 19:46:06 +0800
Labels: run=nginx
Annotations: <none>
Status: Pending
IP: 10.244.0.5
IPs:
IP: 10.244.0.5
Containers:
nginx:
Container ID:
Image: nginx
Image ID:
Port: <none>
Host Port: <none>
State: Waiting
Reason: ErrImagePull
Ready: False
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from default-token-mgq96 (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
default-token-mgq96:
Type: Secret (a volume populated by a Secret)
SecretName: default-token-mgq96
Optional: false
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 56m default-scheduler Successfully assigned default/nginx to dev-control-plane
Normal BackOff 40m kubelet, dev-control-plane Back-off pulling image "nginx"
Warning Failed 40m kubelet, dev-control-plane Error: ImagePullBackOff
Warning Failed 13m (x3 over 40m) kubelet, dev-control-plane Failed to pull image "nginx": rpc error: code = Unknown desc = failed to pull and unpack image "docker.io/library/nginx:latest": failed to copy: unexpected EOF
Warning Failed 13m (x3 over 40m) kubelet, dev-control-plane Error: ErrImagePull
Normal Pulling 13m (x4 over 56m) kubelet, dev-control-plane Pulling image "nginx"
When I entered to the kindest/node container, but there is no docker in it. Not sure how KIND works, originally I understand it deploys a K8S cluster into a Docker container.
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
a644f8b61314 kindest/node:v1.19.0 "/usr/local/bin/entr…" About an hour ago Up About an hour 127.0.0.1:52301->6443/tcp dev-control-plane
$ docker exec -it a644f8b61314 /bin/bash
root#dev-control-plane:/# docker -v
bash: docker: command not found
After reading the Kind docs, I can not find an option to set a repository mirror there like that in Minikube.
BTW, I am using the latest Docker Desktop beta on a Windows 10.

Answer 1

First pull the image in your local system using docker pull nginx and then use below command to load that image to the kind cluster
kind load docker-image nginx --name kind-cluster-name
Kind uses containerd instead of docker as runtime, that's why docker is not installed on the nodes.
Alternatively you can use crictl tool to pull and check images inside the kind node.
crictl pull nginx
crictl images

Answer 2

I've run into same issue because I've exported http_proxy and https_proxy before creating cluster to a local proxy (127.0.0.1), which is unrechable in the cluster. After unset http(s)_proxy and recreate cluster, everything runs fine.