centos7 container is restarting again again itself

Question

I have been trying to run centos7 container by using following Docker compose file and Dockerfile-

version: "2"    data:
    build:
      context: ./docker-build
      dockerfile: Dockerfile.data
    restart: always
    ports:
      - "8082:8082"
    command: bash
Dockerfile:
FROM centos:7
RUN yum -y update
CMD /bin/sh

That centos7 container is restarting continuously and I am unable to figure out the reason for it and need help to resolve it?

Answer 1

Usually Containers stop once their main process exits but in your case, the main process is a shell (/bin/sh or bash). A shell without a TTY attached exits immediately.

If you want to keep your container running, add a TTY to the container;

When using docker run;

Run a container interactively;

docker run -it centos:7 bash

Run the container in the background ("detached", -d);

docker run -dit centos:7 bash

When using a 

docker-compose.yml:

version: "2"
services:
  data:
    build:
      context: ./docker-build
      dockerfile:
Dockerfile.data
    restart: always
    ports:
      - "8082:8082"
    command: bash
    tty: true