9gel / docker-wait

Perform task after a link and port is available

docker-wait

docker-wait is a base image that you can use to create an image that

• blocks until a specified container and port is accepting TCP connection
• perform a task after that

The image is based on alpine so you can take advantage of apk to install utilities.

To use

• use 9gel/docker-wait as the base image FROM 9gel/docker-wait, or your own fork and image on a Docker repository
• create an entrypoint or command script
• in the script, call sh /wait before your command that requires some container to be up
• when you do docker run or in your docker-compose.yml define the environment variables:
  • WAIT_ON_LINK - the linked container to wait on
  • WAIT_ON_PORT - the port on that container to wait on

See docker-compose.yml and example/ for an example.