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Deploy inhouse docker image with kubeadm

10/24/2018

I try to deploy one docker image that I build and is not on a public or private registry.

I use the imagePullPolicy: IfNotPresent for the Kubernetes deployment.

I use kubeadm v1.12 the error:

Normal   Scheduled       35s                default-scheduler       Successfully assigned default/test-777dd9bc96-chgc7 to ip-10-0-1-154
Normal   SandboxChanged  32s                kubelet, ip-10-0-1-154  Pod sandbox changed, it will be killed and re-created.
Normal   BackOff         30s (x3 over 31s)  kubelet, ip-10-0-1-154  Back-off pulling image "test_kube"
Warning  Failed          30s (x3 over 31s)  kubelet, ip-10-0-1-154  Error: ImagePullBackOff
Normal   Pulling         15s (x2 over 34s)  kubelet, ip-10-0-1-154  pulling image "test"
Warning  Failed          13s (x2 over 33s)  kubelet, ip-10-0-1-154  Failed to pull image "test": rpc error: code = Unknown desc = Error response from daemon: pull access denied for test_kube, repository does not exist or may require 'docker login'
Warning  Failed          13s (x2 over 33s)  kubelet, ip-10-0-1-154  Error: ErrImagePull

My deployment file:

apiVersion: apps/v1beta1
kind: Deployment
vmetadata:
  name: test-kube
spec:
  template:
    metadata:
  labels:
    app: test
spec:
  containers:
  - name: test
    image: test
    imagePullPolicy: IfNotPresent
    ports:
    - containerPort: 3000
    env:
    - name: SECRET-KUBE
      valueFrom:
        secretKeyRef:
          name: secret-test
          key: username

docker images]

REPOSITORY  TAG
test   latest 
test   test

In the deployment file i tried with

image: test and with image: test:test

The same error:

Error: ErrImagePull

-- pioupiou

docker

kubeadm

kubernetes

2 Answers

1/31/2019

You should have a docker private registry on the master node of the kubernetes cluster so that if the pod is deployed on a node to pull the image from there. You can find the steps to create a Kubernetes cluster with docker private registry at: Kubernetes cluster with docker private registry

6. Creating a docker private registry on master node

# Set basic auth.
rm -f /auth/*
mkdir -p /auth
docker run --entrypoint htpasswd registry:2 -Bbn test test > /auth/htpasswd

docker rm registry -f

# Set certificates auth.
rm -f /certs/*
mkdir -p /certs
openssl genrsa 1024 > /certs/registrykey.pem
chmod 400 /certs/registrykey.pem
openssl req -new -x509 -nodes -sha1 -days 365 -key /certs/registrykey.pem  -out /certs/registry.pem  -subj "/C=/ST=/L=/O=/OU=/CN=registry.com" > /dev/null 2>&1
docker run -d -e REGISTRY_HTTP_ADDR=0.0.0.0:5000 -p 5000:5000 --restart=always --name registry -v `pwd`/auth:/auth -e "REGISTRY_AUTH=htpasswd" -e "REGISTRY_AUTH_HTPASSWD_REALM=Registry Realm" -e REGISTRY_AUTH_HTPASSWD_PATH=/auth/htpasswd -v `pwd`/certs:/certs -e REGISTRY_HTTP_TLS_CERTIFICATE=/certs/registry.pem -e REGISTRY_HTTP_TLS_KEY=/certs/registrykey.pem registry:2

# Create secret to be used in "imagePullSecrets" section of a pod
kubectl create secret docker-registry regsecret --docker-server=192.168.147.3:5000 --docker-username=test --docker-password=test --namespace=kube-system

# Push image in private registry.
docker tag test-image:latest 192.168.147.3:5000/test-image
docker push 192.168.147.3:5000/test-image

7. YAML example for pod with image from private registry

apiVersion: v1
kind: Pod
metadata:
  name: test-site
  labels:
    app: web
spec:
  containers:
    - name: test
  image: 192.168.147.3:5000/test-image:latest
    ports:
      - containerPort: 8000
  imagePullPolicy: Always
    imagePullSecrets:
      - name: regsecret

-- Danut Radoaica

Source: StackOverflow

10/24/2018

create a secret based on docker registry user with pull/push rights
use it as imagePullSecret

OR

pre-pull the image on the deployment node

Details of creating secret and usage:

A Kubernetes cluster uses the Secret of docker-registry type to authenticate with a container registry to pull a private image.

Create this Secret, naming it regcred:

kubectl create secret docker-registry regcred --docker-server=<your-registry-server> --docker-username=<your-name> --docker-password=<your-pword> --docker-email=<your-email>

where:

<your-registry-server> is your Private Docker Registry FQDN. (https://index.docker.io/v1/ for DockerHub)
<your-name> is your Docker username.
<your-pword> is your Docker password.
<your-email> is your Docker email.

Then create a pod that uses that secret:

apiVersion: v1
kind: Pod
metadata:
  name: private-reg
spec:
  containers:
  - name: private-reg-container
    image: <your-private-image>
  imagePullSecrets:
  - name: regcred

For the local image use case please see this post:

Pull a local image to run a pod in Kubernetes

-- Ijaz Ahmad Khan

Source: StackOverflow

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Deploy inhouse docker image with kubeadm

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