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