Docker volumes on first start

Question

I'm using docker-compose for start dockers. I have image, which have default config inside, but I want to provide my own config based on default by volumes. So I need to get a default, and have able to change it. When I write volumes like this volumes: - config.json:/etc/config.json it will create a folder config.json on host. How I should do this config?

Answer 1

I do it like this when my config.json file is in the same folder than my docker-compose file. volumes: - ${PWD}/config.json:/etc/config.json I noticed that if I use ./config.json it will create a folder named config.json, so I used ${PWD} instead.

Answer 2

On your first run, to get the default config from the etc folder. You can mount the entire etc folder. So all the files in the etc folder will be available in your local machine.

volumes:
      - ./localetc:/etc

Now a new folder called localetc will be created in your current directory.

Then cd localetc && ls -la . Now you can see your config.json file

You can edit your config.json with your custom configuration and restart the containers by issuing docker-compose restart