Correlsense/docker-atstart

Monitor docker container startup and inject software into it

Introduction

This script will monitor the docker service for new containers being started.
When a new container is started, a specified file (or directory) will be copied into it and (optionally) a command will be executed inside the container.

Blog

The code is part of a blog post which is available here:

http://www.correlsense.com/automating-docker-container-monitoring/

Usage

docker-atstart.py [-h] [--container CONTAINER] --source SOURCE --dest DEST ...

positional arguments:

command                 command to run after injection

optional arguments:

-h, --help              show help message and exit
--container CONTAINER   container(s) to inject (wildcards accepted)
--source SOURCE         file/directory to inject
--dest DEST             path inside container where the injected files will be placed

Examples

Copy (and extract) a tar file from the host into the container

  python ./docker-atstart.py --source /tmp/data.tar --dest /tmp/data

Copy a directory from the host into the container

  python ./docker-atstart.py --source /tmp/data --dest /tmp/data

Copy a directory from the host into the container and run a command

  python ./docker-atstart.py --source /tmp/data --dest /tmp/data /tmp/data/process_data

Inject only into instances of our images

  python ./docker-atstart.py --source /tmp/data.tar --dest /tmp/data --container 'my-*'

License

docker-atstart is licensed under the MIT License. See LICENSE for the full license text.