How do I deploy Windows docker containers to docker-for-desktop Kubernetes cluster? pull access denied
Question
I am running docker for desktop with kubernetes enabled. I am using Windows containers (but have also been running Linux containers - I switched modes to Windows). Also, kubernetes is running, but has been using Linux, so I guess the single node in the cluster is using the Linux engine, even though I have switched Docker to use Windows containers. It appears that the local kubernetes cluster is not able to load the Windows image, even though docker is running in Windows container mode.
I am trying to solve the following error:
Failed to pull image "iis-site": rpc error: code = Unknown desc = Error response from daemon: pull access denied for iis-site, repository does not exist or may require 'docker login'
Steps to reproduce
I build a docker image as follows:
FROM microsoft/iis
RUN powershell -NoProfile -Command Remove-Item -Recurse C:\inetpub\wwwroot\*
WORKDIR /inetpub/wwwroot
COPY content/ .
I have a directory structure like this:
D:\TEMP\IIS
│ Dockerfile
│
└───content
index.html
index.html looks like this:
<html>
<body>
Hello World!
</body>
</html>
I run up the container as follows:
docker build -t iis-site .
I can navigate to http://localhost:8000/ and I can see my website! (SUCCESS)
See it in Kubernetes
But now I want to see it running in kubernetes (local cluster).
I do
kubectl apply -f D:\Temp\windows-deployment.yaml
D:\\Temp\\windows-deployment.yaml
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: iis-deployment
spec:
replicas: 1
template:
metadata:
labels:
app: iis
spec:
containers:
- name: iis
image: iis-site
ports:
- containerPort: 80
Now id do:
kubectl get pods
NAME READY STATUS RESTARTS AGE
iis-deployment-5768b4fb85-pfxjk 0/1 ImagePullBackOff 0 18m
sql-deployment-659d64d464-rss5c 1/1 Running 18 40d
streact-deployment-567cf9db9b-g5vkb 1/1 Running 18 39d
web-deployment-669595758-7zcdx 1/1 Running 45 39d
Now I do
kubectl describe pod iis-deployment-5768b4fb85-pfxjk
Failed to pull image "iis-site": rpc error: code = Unknown desc = Error response from daemon: pull access denied for iis-site, repository does not exist or may require 'docker login'
Additional info
kubectl describe node docker-for-desktop
Name: docker-for-desktop
Roles: master
Labels: beta.kubernetes.io/arch=amd64
beta.kubernetes.io/os=linux
kubernetes.io/hostname=docker-for-desktop
node-role.kubernetes.io/master=
Annotations: node.alpha.kubernetes.io/ttl=0
volumes.kubernetes.io/controller-managed-attach-detach=true
CreationTimestamp: Fri, 11 Jan 2019 10:14:26 +0000
Taints: <none>
Unschedulable: false
Conditions:
Type Status LastHeartbeatTime LastTransitionTime Reason Message
---- ------ ----------------- ------------------ ------ -------
OutOfDisk False Wed, 20 Feb 2019 16:32:37 +0000 Wed, 20 Feb 2019 10:06:38 +0000 KubeletHasSufficientDisk kubelet has sufficient disk space available
MemoryPressure False Wed, 20 Feb 2019 16:32:37 +0000 Wed, 20 Feb 2019 10:06:38 +0000 KubeletHasSufficientMemory kubelet has sufficient memory available
DiskPressure False Wed, 20 Feb 2019 16:32:37 +0000 Wed, 20 Feb 2019 10:06:38 +0000 KubeletHasNoDiskPressure kubelet has no disk pressure
PIDPressure False Wed, 20 Feb 2019 16:32:37 +0000 Fri, 11 Jan 2019 10:14:13 +0000 KubeletHasSufficientPID kubelet has sufficient PID available
Ready True Wed, 20 Feb 2019 16:32:37 +0000 Wed, 20 Feb 2019 10:06:38 +0000 KubeletReady kubelet is posting ready status
Addresses:
InternalIP: 192.168.65.3
Hostname: docker-for-desktop
Capacity:
cpu: 2
ephemeral-storage: 61664044Ki
hugepages-2Mi: 0
memory: 2540888Ki
pods: 110
Allocatable:
cpu: 2
ephemeral-storage: 56829582857
hugepages-2Mi: 0
memory: 2438488Ki
pods: 110
System Info:
Machine ID:
System UUID: 8776A14E-A225-4134-838E-B50A6ECAB276
Boot ID: 5a836f34-51a4-4adf-a32d-218a5df09b3c
Kernel Version: 4.9.125-linuxkit
OS Image: Docker for Windows
Operating System: linux
Architecture: amd64
Container Runtime Version: docker://18.9.2
Kubelet Version: v1.10.11
Kube-Proxy Version: v1.10.11
ExternalID: docker-for-desktop
Non-terminated Pods: (12 in total)
Namespace Name CPU Requests CPU Limits Memory Requests Memory Limits
--------- ---- ------------ ---------- --------------- -------------
default iis-deployment-5768b4fb85-pfxjk 0 (0%) 0 (0%) 0 (0%) 0 (0%)
default sql-deployment-659d64d464-rss5c 0 (0%) 0 (0%) 0 (0%) 0 (0%)
default streact-deployment-567cf9db9b-g5vkb 0 (0%) 0 (0%) 0 (0%) 0 (0%)
default web-deployment-669595758-7zcdx 0 (0%) 0 (0%) 0 (0%) 0 (0%)
docker compose-74649b4db6-rm9zc 0 (0%) 0 (0%) 0 (0%) 0 (0%)
docker compose-api-fb7b8f78f-drllk 0 (0%) 0 (0%) 0 (0%) 0 (0%)
kube-system etcd-docker-for-desktop 0 (0%) 0 (0%) 0 (0%) 0 (0%)
kube-system kube-apiserver-docker-for-desktop 250m (12%) 0 (0%) 0 (0%) 0 (0%)
kube-system kube-controller-manager-docker-for-desktop 200m (10%) 0 (0%) 0 (0%) 0 (0%)
kube-system kube-dns-86f4d74b45-h2p5q 260m (13%) 0 (0%) 110Mi (4%) 170Mi (7%)
kube-system kube-proxy-p8vj7 0 (0%) 0 (0%) 0 (0%) 0 (0%)
kube-system kube-scheduler-docker-for-desktop 100m (5%) 0 (0%) 0 (0%) 0 (0%)
Allocated resources:
(Total limits may be over 100 percent, i.e., overcommitted.)
CPU Requests CPU Limits Memory Requests Memory Limits
------------ ---------- --------------- -------------
810m (40%) 0 (0%) 110Mi (4%) 170Mi (7%)
Events: <none>
Note: The above output indicates the following:
Operating System: linux
So it appears that even though the docker engine is running Windows containers, the local Kubernetes cluster (control plane) is running Linux.
I would greatly appreciate any ideas on how to fix the above error ie pull access denied so that I can run a local Kubernetes cluster on Windows 10 with Windows containers.
1 answers
solution1
1 2019-02-20 23:11:54
The error you are seeing is not related to whether it can run or cannot run Windows containers, it's because it's not able to pull the image. It doesn't look like you pushed the image to docker hub . After you build it you need to run:
docker tag -t <yourdockerhubuser>/iis iis
docker push <yourdockerhubuser>/iis
You will need to set up your docker hub credentials as an ImagePullSecrets on your deployment. Then on you K8s deployment:
apiVersion: apps/v1beta1
kind: Deployment
metadata:
name: iis-deployment
spec:
replicas: 1
template:
metadata:
labels:
app: iis
spec:
containers:
- name: <yourdockerhubuser>/iis
image: iis-site
ports:
- containerPort: 80
imagePullSecrets:
- name: <your-docker-hub-user-secret>
Ok, this container will not run because you have Linux on your node, so you need to have a Windows node and for that, you will have set up the kubelet on your Windows machine. (I believe Docker for Windows doesn't support a Windows kubelet, and just a Linux kubelet running in VM).
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