jainnish94/wait-for-it repository overview

⁠Wait-For-It

Wait for it is a simple dockerized version of the script wait-for-it⁠ build at Stackroute⁠.

⁠Why Wait-For-It?

Wait-For-It can be used to synchronize spinning up of interdependent services.

Let's say that you have a docker-container B depending on an other docker-container A.

Container A gets started but there are certain services in container A which are yet to be available. Since the container A got started, Container B thinks that the services in container A are also available. Now when container B tries to connect the service available in container A it says connection refused.

Now Wait-For-It basically attempts to solve the problem by listening on the url of the service.

⁠How to use?

Wait Wait-For-It itself has no clue on what service it should wait. Then how would it work?. Well it's super simple. It involves two simple steps:

1. Define Services for which you want to wait in wait.txt.

   ⁠wait-for-it/wait.txt

   // If you know the url of the service.
   // For Example: bolt://172.23.238.135
   
   mongodb://172.23.238.135
   
   // If host and port are present as the environment variable. MONGO_HOST and MONGO_PORT are the environmental variables here
   
   $MONGO_HOST:$MONGO_PORT
   
   

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2. Use the wait service in wait-for-it.

   ⁠docker-compose.yml

   version: '2'
   services:
     wait:
       volumes:
         - ./wait-for-it:/dependencies
   

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