Dennis Zheleznyak

Dennis Zheleznyak

DevOps Engineer bigpanda

© 2021

Docker pull, modify and push images

Sometimes, we need to pull an official/non official images, modify them and push them to our image repository. To do that, we can use the following commands.

First, pull the docker image you want to modify:

docker pull elasticsearch:5.3.2

Create a container out of the pulled image:

docker container run -itd --name es532 elasticsearch:5.3.2

Check that the container started properly and copy the container’s id:

sudo docker ps

CONTAINER ID        IMAGE                 COMMAND                  CREATED             STATUS              PORTS                NAMES
c237912e7086        elasticsearch:5.3.2   "/docker-entrypoint.…"   17 seconds ago      Up 16 seconds       9200/tcp, 9300/tcp   es532

Make the modifications you want, I’ll show some of them:

sudo docker exec -it -u root <ContainerID> /bin/bash
sudo docker cp . <ContainerID>:/usr/share/elasticsearch/config

You can make a direct change to the CMD or ENTRYPOINT and create a new image:

docker commit --change='CMD ["elasticsearch"]' <ContainerID> <NewImageName>

If you didn’t make a direct change to CMD or ENTRYPOINT, create a new image out of the modified container:

docker container commit <modifiedContainerID> <NewImageName>

Tag the image with the repository address:

docker tag <NewImageName>:latest <RepositoryAddress e.g> 

Login to your repository before pushing:

aws ecr get-login-password --region us-east-2 \
| docker login --username AWS --password-stdin \

Push the image to your repository:

docker push