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How to set image name in Dockerfile?


Question

You can set image name when building a custom image, like this:

docker build -t dude/man:v2 . # Will be named dude/man:v2

Is there a way to define the name of the image in Dockerfile, so I don't have to mention it in the docker build command?

2019/01/22
1
322
1/22/2019 12:55:36 PM

Accepted Answer

Tagging of the image isn't supported inside the Dockerfile. This needs to be done in your build command. As a workaround, you can do the build with a docker-compose.yml that identifies the target image name and then run a docker-compose build. A sample docker-compose.yml would look like

version: '2'

services:
  man:
    build: .
    image: dude/man:v2

That said, there's a push against doing the build with compose since that doesn't work with swarm mode deploys. So you're back to running the command as you've given in your question:

docker build -t dude/man:v2 .

Personally, I tend to build with a small shell script in my folder (build.sh) which passes any args and includes the name of the image there to save typing. And for production, the build is handled by a ci/cd server that has the image name inside the pipeline script.

2019/01/03
280
1/3/2019 6:41:33 PM


Here is another version if you have to reference a specific docker file:

version: "3"
services:
  nginx:
    container_name: nginx
    build:
      context: ../..
      dockerfile: ./docker/nginx/Dockerfile
    image: my_nginx:latest

Then you just run

docker-compose build
2019/09/11