Docker组成当另一个停止时启动容器

Question

I'm wondering, is there any option to start containers one by one in Docker Compose? Eg I want to start DB container and special container to init this DB, and main application should be started after init container finished. Or I want to perform compilation in one container, then packing in another. In Kubernetes there is something called "init pods", similar to this, as far as I understand. Is there any alternative in Docker Compose?

Answer 1

What you are trying to do here fundamentally does not refer to as service. As detailed in comment , service is a long-running process that interacts with other services to form an application.

I suggest you take a look at dobi It runs project tasks (like running a shell, running unit tests, running migration).

There's an example of the compose integration and running db migrations here: https://github.com/dnephin/dobi/tree/master/examples/init-db-with-rails

Answer 2

Well why don't you use depends_on tag

   depends_on: 
      - <YourDockerContainer>

Looks at this example below where

Kibana is dependant on ElasticSearch and fluentd, while Elasticsearch is dependant on fluentd using depends_on tag

 fluentd:
    image: fluentd

 elasticsearch:
    image: elasticsearch
 depends_on: 
   - fluentd  

 kibana:
    image: kibana
 depends_on: 
   - fluentd
  - elasticsearch

Order of Start will be

1> fluentd

2> elasticsearch

3> kibana