docker-fabric 0.3.3

Integration of Docker deployments into Fabric.

Docker-Fabric

Integration of Docker deployments into Fabric.

Project: https://github.com/merll/docker-fabric

Docs: https://docker-fabric.readthedocs.org/en/latest/

Overview

With a few preparations, Docker images can easily be generated and tested on development machines, and transferred on to a production environment. This package is based on Docker-Map, and therefore supports managing container configurations along with their dependencies within Fabric-based deployments. Wherever possible, the library makes calls to the Remote API; for certain features (e.g. extracting container contents) the Docker command-line interface (CLI) is used.

API access

As with Docker-Map, container configurations can be generated as objects, updated from Python dictionaries, or imported from YAML files in order to control remote clients via the API. Docker-Fabric includes the following enhancements:

Docker client

DockerFabricClient is an implementation of Docker-Map’s DockerClientWrapper. It adds Fabric-like logging in the context of container instances on top of Fabric hosts, and enables automatic creation of tunnel connections for access to a remote Docker host using Fabric’s SSH connection.

By using the tool socat, a Docker client can be used on a remote machine through an existing SSH tunnel, without re-configuring Docker to enable access by a TCP port. If you have already done that, you can still use a local SSH tunnel for avoiding exposing Docker outside of localhost, as that is not recommended.

Client configuration

DockerClientConfiguration is extending ClientConfiguration, and adds the capability of running containers to Fabric hosts with specific Docker settings for each.

Running container configurations

ContainerFabric is a simple wrapper that combines Docker-Map’s DockerFabricClient, DockerClientConfiguration objects, and container mmaps.

Command-line based access

Provides the following features by running the appropriate commands on a remote Docker command line:

• Copy resources from a container to a Fabric host.

• Copy resources from a container and download them in a compressed tarball. The Docker Remote API currently does not support creating compressed tarballs.

• Copy resources from a container and store them in a new blank image.

• Generate a compressed image tarball. The Docker Remote API currently does not support creating compressed tarballs, but is capable of importing them.

Tasks

All essential container actions (create, start, stop, remove) and some advanced (e.g. update) can be triggered from the command line as Fabric tasks.

Additionally the following tasks are included in this package, that can be run by Fabric directly:

• install_docker: Install Docker on a remote machine (to be adapted to more distributions). Uses the latest released version for Ubuntu.

• build_socat: Download and install the tool socat. This is used to build a tunneled access to a remote Docker, if it is only accessible through a local socket.

• check_version: Returns version information of the remote Docker service and provides useful insight if permissions are set up properly.

• cleanup_containers: Removes all containers that have stopped.

• cleanup_images: Removes all untagged images, that do not have a dependent container or other dependent images.

• remove_all_containers: Stops and removes all containers on the remote Docker service.

Contributions

Thanks to lfasnacht for publishing an implementation for a local tunnel to a Fabric client in the pull request 939 of Fabric.