./wait-for is a script designed to synchronize services like docker containers. It is sh and alpine compatible. It was inspired by vishnubob/wait-for-it, but the core has been rewritten at Eficode by dsuni and mrako.

When using this tool, you only need to pick the wait-for file as part of your project.

./wait-for host:port [-t timeout] [-- command args]
  -q | --quiet                        Do not output any status messages
  -t TIMEOUT | --timeout=timeout      Timeout in seconds, zero for no timeout
  -- COMMAND ARGS                     Execute command with args after the test finishes

To check if eficode.com is available:

$ ./wait-for www.eficode.com:80 -- echo "Eficode site is up"

Connection to www.eficode.com port 80 [tcp/http] succeeded!
Eficode site is up

To wait for database container to become available:

version: '2'

services:
  db:
    image: postgres:9.4

  backend:
    build: backend
    command: sh -c './wait-for db:5432 -- npm start'
    depends_on:
      - db

Ironically testing is done using bats, which on the other hand is depending on bash.

docker build -t wait-for .
docker run -t wait-for

When creating PRs, please style your commit messages according to conventional commit, you can use a tool like commitizen to guide you. We will automatically infer the changelog from your commits. Alternatively, we can squash all commits when merging and update the commit message.

This project strongly prefers maintaining backwards compatibility, therefore some obvious "fixes" might not be accepted.

Also, please include or update the test cases whenever possible by extending wait-for.bats.

Make sure netcat is installed in your Dockerfile before running the command.

RUN apt-get -q update && apt-get -qy install netcat

https://stackoverflow.com/questions/44663180/docker-why-does-wait-for-always-time-out