wait-for-docker

A slim and simple docker container that uses netcat to determine whether other docker containers are ready to accept incoming connections.

Usage

Spin up your container(s) and then use the wait-for docker container to wait for those container(s) to accept incoming connections on a specified port.

For example:

docker network create example-network
docker run -d --network example-network -p 5432:5432 --name postgres postgres:latest
docker run -d --network example-network -p 80:80 --name web mycargus/hello_docker_world:master
docker run --rm --network example-network mycargus/wait-for:master \
  postgres:5432 web:80

Or with docker-compose (it creates a network for you):

# docker-compose.yml
---
version: '3.7'

services:
  wait-for:
    image: mycargus/wait-for:master

  web:
    command: "bash -c 'sleep 10 && ruby hello.rb -p 8080'"
    image: mycargus/hello_docker_world:master
    ports:
      - '8080:8080'

docker-compose up -d web
docker-compose run --rm wait-for web:8080

You can customize wait-for according to your needs with environment variables such as WAIT_ATTEMPTS and WAIT_INTERVAL. See bin/wait-for for details.

Roadmap

• add YAML linter
• add Dockerfile linter
• add git pre-commit hooks
• add more tests

Contributing

We welcome and encourage contributions! See our Contributing doc for development instructions and more info.

License

MIT. See LICENSE for details.