Introduction
In most of cases, you are not pulling images from docker hub public repository. You might have your private registry or repository configured in your premises. In that case, you need to tell kubernetes how to pull images from that repository.
Create Docker-Config json file
First, you need to create docker-config json file. Filename: docker-config.json
Assumming, I have registry/repository host as: my-docker-repository.com
Example:
{
"auths": {
"my-docker-repository.com": {
"username": "<username>",
"password": "<artifactory token>",
"email": "<email>",
"auth": "<base64(username:token)>"
}
}
}Note: The auth above is calculated as base64 of "username:token".
You might have multiple repositories. In that case, just add multiple such json like below:
{
"auths":{
"<repo1>":{
"username": "",
"password": "",
"email": "",
"auth": ""
},
"<repo2>":{
"username": "",
"password": "",
"email": "",
"auth": ""
},
"<repo3>":{
"username": "",
"password": "",
"email": "",
"auth": ""
},
}
}Shell Script for Creating Secret
Below is the script for creating kubernetes secret.
kubectl create secret generic dockerreg_cred --from-file=.dockerconfigjson=./secret/prod/docker-config.json --type=kubernetes.io/dockerconfigjsonWhere, I have placed the docker-config.json file at secret/prod/docker-config.json.
Above script will create a kubernetes secret. Now, is the time to use this secret while pulling docker image.
Sample Deployment Yaml Config file
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-api
labels:
app: my-api
spec:
replicas: 1
selector:
matchLabels:
app: my-api
template:
metadata:
labels:
app: my-api
spec:
containers:
- name: my-api
image: my-docker-repo.com/apps/head/my-api:latest
imagePullPolicy: Always
envFrom:
- configMapRef:
name: my-api-config
ports:
- containerPort: 8080
volumeMounts:
- name: my-api-pvc
mountPath: /var/opt
resources:
limits:
cpu: 2
memory: 4Gi
requests:
cpu: 2
memory: 4Gi
imagePullSecrets:
- name: dockerreg_cred
volumes:
- name: my-api-pvc
persistentVolumeClaim:
claimName: my-pvcNote the section:
imagePullSecrets:
- name: dockerreg_credYou are all set.
