depends_on doesn't wait for another service in docker-compose 1.22.0

Question

My current docker-compose.yml -

# This docker-compose file uses \'.env\' file present in the current directory, 
# for database credentials.         


        

Answer 1

depends_on just guaranteed that database service run before web service. To run web service after database is ready, use wait_for_it.sh script https://docs.docker.com/compose/startup-order/ For example, i have a docker-compose.yml file with two services: app and db, and i want to run container app after db service are ready:

docker-compose.yml

version: "2"
services:
  app:
    image: employee-jdbc
    ports:
      - "8080:8080"
    networks:
      - employee-mysql
    depends_on:
      - mysqldb
    container_name: employee-jdbc
  db:
    image: mysql:5.7
    networks:
      - employee-mysql
    environment:
      - MYSQL_ROOT_PASSWORD=root
      - MYSQL_DATABASE=bootdb  
    container_name: mysqldb
networks:
  employee-mysql:
    external: true

In Dockerfile to build employee-jdbc image:

Dockerfile

FROM openjdk:8
COPY ./target/*.jar ROOT.jar
COPY wait-for-it.sh /wait-for-it.sh
RUN chmod +x /wait-for-it.sh
ENTRYPOINT ["./wait-for-it.sh","db:3306","--","java","-jar","ROOT.jar"]

wait_for_it.sh file you can download at: https://github.com/vishnubob/wait-for-it