RunningDockerInMinimesos

Background

Minimesos itself runs in Docker containers and its agents launch Docker containers. This can be supported by using the host's Docker or running Docker inside the Mesos Agent container. Both solutions have pros and cons.

Current implementation

The current implementation is Docker outside Docker

Docker outside Docker

Pros

• Simple, just add Docker socket as volume
• Can reuse images from the Docker host

Cons

• Volumes do not work since Docker created volume on host instead of inside agent

Docker inside Docker

Pros

• Matches a production setup

Cons

• Cannot reuse images from Docker host. Require registry container and pushing & pulling images. Pushing be avoided if Docker Distribution supports loading images from host on startup
• Complex Docker image with supervisor which manages agent process and Docker
• Developers require a proxy to talk to inner Docker