标记Docker映像并在docker-compose中添加变量

Question

I'm using docker to build and deploy applications. After building the image i need to tag and use that image from another system which has docker-compose on it. I'm using Jenkins to build and deploy images to private docker registries. Docker compose file on the host system should automatically pull those images based on tag version.

How to pass variables to docker-compose to substitute tag values ?

Example: if a=2.4 then it should substitute 2.4 inside docker-compose file for a.

version: '2'
services:
 web:
  image: httpd:$a
  ports:
    - 80:80

Answer 1

You can actually use this as written. Docker compose will use your OS environment to populate variables using the syntax that you have here.

On Mac/Linux:

export a=2.4
docker-compose up