How to publish images to Docker Hub

PUBLISHED
13 JANUARY 2022

• Getting the docker image
  • Method 1: using Dockerfile
  • Method 2: pull docker image
• Run the docker image & run configurations
• Grab the container ID
• Run docker commit
• Run docker push

Getting the docker image

Method 1: using Dockerfile

Create a file named Dockerfile and write the contents below

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FROM jekyll/builder:3.8
RUN apk add --update --no-cache nodejs npm
RUN gem install kramdown-math-katex bundler

Then build the docker image from Dockerfile using docker build . -t image_name:tag_name, where the tag is optional

Method 2: pull docker image

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# format: docker pull image_name:tag_name
docker pull jekyll/builder:3.8

Run the docker image & run configurations

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docker run --rm -it jekyll/builder:3.8 bash
mkdir test-directory/
exit

NOTE:

• docker run ... -i image_name:tag_name bash -c "command_name" to execute commands through the container
• use --rm for automatic clean up of containers upon exiting the container

Grab the container ID

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docker ps -a

# example output
CONTAINER ID   IMAGE            COMMAND                  CREATED        ...
d96a67fbc97f   jekyll-builder   "/usr/jekyll/bin/ent…"   21 hours ago   ...
ba05b0a4b940   b5dd64e479c8     "/usr/jekyll/bin/ent…"   22 hours ago   ...

where you will see a 12 character string under CONTAINER ID

Before proceeding, ensure that you are logged into docker hub by running docker login

Run docker commit

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docker commit container_id dockerhub_username/repository:tag_name
# for example
docker commit d96a67fbc97f evantancy/test-repo:latest

Run docker push

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docker push evantancy/test-repo:latest

Now head on over to Docker Hub and your custom image is there! I’ve managed to find a great video on this here.