How to add a new application to a docker image

Docker Hub General
1

Hello,
I have an docker image. And I would like to add some package to it.
I managed to do it with the following command:
docker exec -it artemis-server apk install graphviz

I have to run this command every time I stat a contianier.
how to do in permanently way to have this package in the image?

2

Hi :slight_smile:

You need to make your own image, based on the one you’re running with docker run…

An example of this:
Create a file named: dockerfile with content:

FROM the-image-you-want-to-build-from:tag
RUN apk install graphviz

Then build it:

docker build -t yourimage:latest .

Then you’re able to use that image as normal:

docker run -tid ... yourimage:latest
3

Thank you Martin for your answer.
I have a following situation. A docker image is created by “docker compose up” command which reads the “docker-compose.yml” config file. here is it’s content:

  services:
    artemis-server:
      command: sh -c "./gradlew buildJarForDocker && java -jar build/libs/Artemis-*.jar"
      image: openjdk:16-jdk-alpine
      environment:
         - SPRING_DATASOURCE_URL=jdbc:mysql://artemis-mysql:3306 
      ...

I would like to add “apk install graphviz” command.

How to add this in yml file?

4

The correct way is still my approach.

what you can do, is create the dockerfile as:

FROM openjdk:16-jdk-alpine
RUN apk install graphviz

Change your compose to use the dockerfile via the build: arg:

  services:
    artemis-server:
      command: sh -c "./gradlew buildJarForDocker && java -jar build/libs/Artemis-*.jar"
      image: yourimage:latest
      build: .
      environment:
         - SPRING_DATASOURCE_URL=jdbc:mysql://artemis-mysql:3306

(the . in build just tells that the dockerfile is in the same directory as the docker-compose file)

now, when you run: docker-compose up -d
it will see that the image you defined, does not exist, but it can see the build: tag, and will then build the image with you apk install… and then run the container with that image.

hope that makes sense

5

It works fine now :slight_smile:
Thank you very much

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