Docker_deploy_tool

A simple tool for building a docker image from a Dockerfile and staring multimple containers from it.The tool reads a configuration file web_conf.yml and creates/runs the specified number of containers and performs a basic health check by calling a check status url. Appart from creating docker images containers and running them it also keeps the specified number of containers specified in web_conf.yml.

Parameters

• -b : Read the web_conf.yml and build/run containers accordingly
• --logs : Show the logs from all containers
• --stats ; Show stats from all containers

Example execution

docker_deploy_tool.py -b # build images/containers and run
docker_deploy_tool.py -b --logs # build images/containers, run containers and view logs
docker_deploy_tool.py --logs|--stats # Only view logs or stats

Example Configuration

The following configuraion will deploy 2 instances of redis and 4 instaces of a simple web application which will be connected to the redis_1 container. Each deployed web application (container) uses the redis in order to increase and get a hits counter.

e.g Hello Container World! I have been seen 3 times.

---
0_redis:
  build: false
  instances: 2
  image: redis
  tag: latest
  internal_port: 6379
  external_port: 6379
  check: False

1_web_app:
  build: true
  instances: 4
  image: simple_web_app
  tag: 0.0.1
  internal_port: 5000
  external_port: 8000
  links:
    - redis_1
  check_url: "http://127.0.0.1:{port}/status"

Variables

• build : if true builds a docker image from the Dockerfile in files folder else pulls image from docker registry
• instances : the required number of docker containers
• image : the name of the image to be build/pulled
• tag : tag of the image to be build/pulled
• internal_port : internal port of the service running in container(s)
• external_port : external port (exposed port) of the docker container. It is used as a staring point and every new container uses the (+1) port.
• links : a list of docker containers to be linked with this container
• check_url : if defined it will be used to check tha health of its running containers (web apps)