Docker: Defining Custom Location for Named Volume

PROBLEM

Let’s assume we have the following docker-compose.yml:

version: '2'

services:
  jenkins:
    image: "jenkinsci/jenkins"
    ports:
    - "8080:8080"
    volumes:
     - jenkins:/var/jenkins_home

volumes:
  jenkins:

By the default, all Docker-managed named volumes are stored under the installed Docker directory… typically, /var/lib/docker/volumes/[path].

However, it is possible /var mount is low on disk space.

SOLUTION

It appears we can create a custom location for the given named volume:-

version: '2'

services:
  jenkins:
    image: "jenkinsci/jenkins"
    ports:
    - "8080:8080"
    volumes:
     - jenkins:/var/jenkins_home

volumes:
  jenkins:
    driver_opts:
      type: none
      device: /data/jenkins
      o: bind

Keep in mind /data/jenkins must be created first on the host.