Example usage:
Sample docker-compose.yml:
version: '2'
services:
the_database:
image: ubuntu:14.04
command: >
/bin/bash -c "
sleep 5;
nc -lk 0.0.0.0 5432;
"
another_service:
image: ubuntu:14.04
command: >
/bin/bash -c "
sleep 8;
nc -lk 0.0.0.0 5555;
"
the_web_server:
image: ubuntu:14.04
depends_on:
- the_database
- another_service
command: >
/bin/bash -c "
nc -z the_database 5432 &&
echo Connected to DB and started!
"
start_dependencies:
image: dadarek/wait-for-dependencies
depends_on:
- the_database
- another_service
command: the_database:5432 another_service:5555Then, to guarantee that the_database and another_service are ready before running the_web_server:
$ docker-compose run --rm start_dependencies
# Some output from docker compose
$ docker-compose up the_web_serverBy default, there will be a 2 second sleep time between each check. You can modify this by setting the SLEEP_LENGTH environment variable:
start_dependencies:
image: dadarek/wait-for-dependencies
environment:
- SLEEP_LENGTH: 0.5By default, there will be a 300 seconds timeout before cancelling the wait_for. You can modify this by setting the TIMEOUT_LENGTH environment variable:
start_dependencies:
image: dadarek/wait-for-dependencies
environment:
- SLEEP_LENGTH: 1
- TIMEOUT_LENGTH: 60