Wait for another service to become available
./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
docker build -t wait-for . docker run -t wait-for
Make sure netcat is installed in your Dockerfile before running the command.
RUN apt-get -q update && apt-get -qy install netcat