Restart Policies Docker Compose

There are mainly 4 different restart policies.

"no"

It means never attempt to restart the container if it stops or crashes.
All we have to do is to add restart: 'no' in our docker-compose.yml file.

Remember to give single quotes 'no' because in yaml file, if we give no without quotes, it is treated as false.

Sample code example

version: '3'
services: 
  redis-server:
    image: 'redis'
  node-app:
    restart: 'no'
    build: .
    ports: 
      - "4001:8081"

always

If our container stops for any reason, always attempt to restart the stopped container.
All we have to do is to add restart: always in docker-compose.yml file.

Sample code example

version: '3'
services: 
  redis-server:
    image: 'redis'
  node-app:
    restart: always
    build: .
    ports: 
      - "4001:8081"

on-failure

Only restart the container, if it stops with an error code.

Error codes are non zero codes like 1, 2, 3, 4,....

Code 0 indicate there are no error and process is exited.

All we have to do is add restart: on-failure to our docker-compose.yml file.

Sample code example

version: '3'
services: 
  redis-server:
    image: 'redis'
  node-app:
    restart: on-failure
    build: .
    ports: 
      - "4001:8081"

unless-stopped

Always restart unless the developers forcibly stop the process.

All we have to do is add restart: unless-stopped in docker-compose.yml file.

Sample code example

version: '3'
services: 
  redis-server:
    image: 'redis'
  node-app:
    restart: unless-stopped
    build: .
    ports: 
      - "4001:8081"

Note : Always run docker-compose up --build after making any changes to the .yml file, or any project directory file.

Docker official Documentation

Rohithv07 / Docker

My Workplay on Docker and Kubernetes. Ref : https://github.com/Rohithv07/DockerCasts

Docker and Kubernetes

My Workplay on docker

Commands to remember :

• docker run :- runs a command in a new container . docker run = docker create + docker start

• docker run -p <localhostport>:<containerport> <imagename/id> :- running on ports

• docker ps :- to list all the running containers

• docker ps --all :- list all the container ever created

• docker system prune :- to delete all the containers ever created along with some other properties

• docker logs <container-id> :- to get the logs

• docker start :- start stopped container

• docker stop :- stop the container - gets a sigterm message - terminate signal

• docker kill :- kills the container or stops the container instantly

• docker exec -it <container id> <command> :- Execute an additional command in container. -it makes us to provide the input. -it equivalent to -i -t

• docker exec -it <container id> sh :- provides access to the terminal…

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Comments

[Tiago França]

Thank you. Helped me a lot

[Yifei Kong]

Note that the default value is no, you should probably change it to unless-stopped.