I have below YAML file used in Kubernetes of Windows Docker Desktop.
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: thoughts-backend
labels:
app: thoughts-backend
namespace: example
spec:
replicas: 1
selector:
matchLabels:
app: thoughts-backend
template:
metadata:
labels:
app: thoughts-backend
spec:
containers:
- name: thoughts-backend-service
image: thoughts_server:latest
imagePullPolicy: Never
ports:
- containerPort: 8000
env:
- name: DATABASE_ENGINE
value: POSTGRESQL
- name: POSTGRES_DB
value: thoughts
- name: POSTGRES_USER
value: postgres
- name: POSTGRES_PASSWORD
value: somepassword
- name: POSTGRES_PORT
value: "5432"
- name: POSTGRES_HOST
value: "127.0.0.1"
- name: thoughts-backend-db
image: thoughts_backend_db:latest
imagePullPolicy: Never
---
apiVersion: v1
kind: Service
metadata:
namespace: example
labels:
app: thoughts-service
name: thoughts-service
spec:
ports:
- name: thoughts-backend
port: 80
targetPort: 8000
selector:
app: thoughts-backend
type: NodePort
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: thoughts-backend-ingress
namespace: example
spec:
rules:
- host: thoughts.example.local
http:
paths:
- backend:
serviceName: thoughts-service
servicePort: 80
path: /
When I run kubectl get pods -n example I get ErrImageNeverPull error.
> kubectl get pods -n example
NAME READY STATUS RESTARTS AGE
thoughts-backend-55c686f6f5-dhjj2 0/2 ErrImageNeverPull 0 3h43m
>
Following is the output of describe command.
> kubectl describe pod thoughts-backend-55c686f6f5-dhjj2 -n example
Name: thoughts-backend-55c686f6f5-dhjj2
Namespace: example
Priority: 0
Node: docker-desktop/192.168.65.4
Start Time: Sat, 27 Nov 2021 16:31:29 0530
Labels: app=thoughts-backend
pod-template-hash=55c686f6f5
Annotations: <none>
Status: Pending
IP: 10.1.0.23
IPs:
IP: 10.1.0.23
Controlled By: ReplicaSet/thoughts-backend-55c686f6f5
Containers:
thoughts-backend-service:
Container ID:
Image: thoughts_server:latest
Image ID:
Port: 8000/TCP
Host Port: 0/TCP
State: Waiting
Reason: ErrImageNeverPull
Ready: False
Restart Count: 0
Environment:
DATABASE_ENGINE: POSTGRESQL
POSTGRES_DB: thoughts
POSTGRES_USER: postgres
POSTGRES_PASSWORD: somepassword
POSTGRES_PORT: 5432
POSTGRES_HOST: 127.0.0.1
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-tqssf (ro)
thoughts-backend-db:
Container ID:
Image: thoughts_backend_db:latest
Image ID:
Port: <none>
Host Port: <none>
State: Waiting
Reason: ErrImageNeverPull
Ready: False
Restart Count: 0
Environment: <none>
Mounts:
/var/run/secrets/kubernetes.io/serviceaccount from kube-api-access-tqssf (ro)
Conditions:
Type Status
Initialized True
Ready False
ContainersReady False
PodScheduled True
Volumes:
kube-api-access-tqssf:
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
---- ------ ---- ---- -------
Warning ErrImageNeverPull 3m4s (x326 over 4h1m) kubelet Container image "thoughts_server:latest" is not present with pull policy of Never
The Kubernetes version is
> kubectl.exe version
Client Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.5", GitCommit:"aea7bbadd2fc0cd689de94a54e5b7b758869d691", GitTreeState:"clean", BuildDate:"2021-09-15T21:10:45Z", GoVersion:"go1.16.8", Compiler:"gc", Platform:"windows/amd64"}
Server Version: version.Info{Major:"1", Minor:"21", GitVersion:"v1.21.5", GitCommit:"aea7bbadd2fc0cd689de94a54e5b7b758869d691", GitTreeState:"clean", BuildDate:"2021-09-15T21:04:16Z", GoVersion:"go1.16.8", Compiler:"gc", Platform:"linux/amd64"}
I am not sure what is this error and how to fix this in Docker-Desktop? Can anyone help me? I run Kubernetes in Docker-desktop application on Windows.
"thoughts_server:latest" is not present with pull policy of Never
Further, added output of docker images for help in debugging.
> docker images
REPOSITORY TAG IMAGE ID CREATED SIZE
k8s.gcr.io/ingress-nginx/controller <none> ae1a7201ec95 3 days ago 285MB
httpd latest ad17c88403e2 8 days ago 143MB
nginx latest ea335eea17ab 10 days ago 141MB
kubernetesui/dashboard v2.4.0 72f07539ffb5 6 weeks ago 221MB
k8s.gcr.io/ingress-nginx/kube-webhook-certgen <none> c41e9fcadf5a 6 weeks ago 47.7MB
docker/desktop-kubernetes kubernetes-v1.21.5-cni-v0.8.5-critools-v1.17.0-debian 967a1c03eb00 2 months ago 290MB
k8s.gcr.io/kube-apiserver v1.21.5 7b2ac941d4c3 2 months ago 126MB
k8s.gcr.io/kube-scheduler v1.21.5 8e60ea3644d6 2 months ago 50.8MB
k8s.gcr.io/kube-controller-manager v1.21.5 184ef4d127b4 2 months ago 120MB
k8s.gcr.io/kube-proxy v1.21.5 e08abd2be730 2 months ago 104MB
kubernetesui/metrics-scraper v1.0.7 7801cfc6d5c0 5 months ago 34.4MB
docker/desktop-vpnkit-controller v2.0 8c2c38aa676e 6 months ago 21MB
docker/desktop-storage-provisioner v2.0 99f89471f470 7 months ago 41.9MB
k8s.gcr.io/pause 3.4.1 0f8457a4c2ec 10 months ago 683kB
k8s.gcr.io/coredns/coredns v1.8.0 296a6d5035e2 13 months ago 42.5MB
k8s.gcr.io/etcd 3.4.13-0 0369cf4303ff 15 months ago 253MB
Further, added output of kubernetes get pod -o wide command
> kubectl get nodes -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
docker-desktop Ready control-plane,master 21h v1.21.5 192.168.65.4 <none> Docker Desktop 5.4.72-microsoft-standard-WSL2 docker://20.10.10
CodePudding user response：
Per docs,
By default, the kubelet tries to pull each image from the specified registry. However, if the imagePullPolicy property of the container is set to IfNotPresent or Never, then a local image is used (preferentially or exclusively, respectively).
You use imagePullPolicy: Never directive in your Deployment and when you try to deploy your manifest, kubelet fails to find required images locally.
CodePudding user response：
In this section of code alter "Never" to "Always"
- name: thoughts-backend-db
image: thoughts_backend_db:latest
imagePullPolicy: Never
becomes
- name: thoughts-backend-db
image: thoughts_backend_db:latest
imagePullPolicy: Always