Publishing custom docker hub images on github

In this documentation i'm going to show how to publish docker image on docker.

to publish docker image on github Follow these steps:

Generate Secret Token Login to your git hub account and got to settings < Developer Settings < Personal and access token < Tokens (classic) < Generate New Token < Generate New Token (Classic)

Enter note of token and set Expiration Days and Make sure to check boxes which selected in image below.

Scroll Down and Click on

You got on this page make sure to copy Token before reloading page else you lost it and to get again this token have to update token so make sure to copy first and save somewhere.

Make sure to copy your personal access token now. You won’t be able to see it again! copy token by clicking on copy (blue) button beside token

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

Get started with code

Using terminal

open terminal and start with the commands

touch helloWorld.sh

vim ./helloWorld.sh

Paste this Code in the file

#!/bin/bash

echo "Hello World!"

New create Dockerfile

touch ./dockerfile

vim ./dockerfile

Paste this code in the file

FROM alpine

RUN apk add --no-cache bash

WORKDIR /app

COPY helloWorld.sh .
RUN chmod +x helloWorld.sh 

ENTRYPOINT [ "/app/helloWorld.sh" ]

save and close file

Lets publish our docker image in github

Open Terminal by pressing Alt + Ctrl + t

First we have to login on ghcr.io

docker login --username YOUR_USER_NAME --password ENTER_TOKEN

docker login --username bugsfounder --password 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

Now Lets Build the image. (Make sure to change username i'm using bugsfounder change it to yours)

-t --> tag

docker build -t ghcr.io/bugsfounder/hello-world-ghcr:latest

Let's Push the image on ghcr

docker push ghcr.io/bugsfounder/hello-world-ghcr:latest

Check Local iamges Run the image

docker run ghcr.io/bugsfounder/hello-world-ghcr:latest

Let's Delete local image

Now Lets run the image again

docker run ghcr.io/bugsfounder/hello-world-ghcr:latest

bugs@bugs-ThinkPad-T460s:~$ docker run ghcr.io/bugsfounder/hello-world-ghcr:latest
Unable to find image 'ghcr.io/bugsfounder/hello-world-ghcr:latest' locally
latest: Pulling from bugsfounder/hello-world-ghcr
8a49fdb3b6a5: Already exists 
1fa0aab3c125: Already exists 
23243d141af5: Already exists 
223d15820423: Already exists 
63ccb926b07e: Already exists 
Digest: sha256:0ce0062351448adf875858776b9fb938981e0e57a3ebc13fa9f5fc2195727111
Status: Downloaded newer image for ghcr.io/bugsfounder/hello-world-ghcr:latest
Hello world!

New Lets add workflow so we change code in our repo it automatically update the docker image.

push all code on a git repo and we have to create folders in repository,

Go to the Settings of repo and then Secrets and variables < Actions < New Repository Secret

touch  ./.github/workflows/

Enter Name of secret and remember. in this example i'm taking GT_SEC put Token that we created before in the Secret* Box. Now create a file called publish-ghcr.yaml under ./.github/workflows/publish-ghcr.yaml

write code in publish-ghcr.yaml file. make sure to change bugsfounder to your username and GT_SEC to YOUR_SECRET_NAME

# 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
name: Docker Image CI for GHCR

on:
  push

jobs:
  build_and_publish:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
      - name: Build and push the image
        run: |
          docker login --username bugsfounder --password ${{ secrets.GT_SEC }} ghcr.io
          docker build . --tag ghcr.io/bugsfounder/hello-world-ghcr:latest
          docker push ghcr.io/bugsfounder/hello-world-ghcr:latest

Now commit the code and push code on git hub, Go to your profile's Packages section you can see docker images.

You can simply use this images on any system using command below

docker run ghcr.io/bugsfounder/hello-world-ghcr:latest

If you are getting

WARNING! Using --password via the CLI is insecure. Use --password-stdin.
Error response from daemon: Get "https://registry-1.docker.io/v2/": unauthorized: incorrect username or password

Use below command to make it work

# echo "YOUR_PERSONAL_ACCESS_TOKEN" | docker login ghcr.io -u USERNAME --password-stdin
echo "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" | docker login ghcr.io -u bugsfounder --password-stdin