CODEWITHSUNDEEP
dockerdocker-compose
Charles PHAM
Charles PHAM

Reputation: 930

Display message success after docker-compose up is done

I run many services in my docker-compse.yml. I'd like to display a message to let user know when docker-compose up is done? I tried to echo message with command but my container exited with code 0

command: bash -c "echo Congratulation! You can use your containers now"

Is there anyway to let user know when docker-compose up is done? Many thanks!

Upvotes: 6

Views: 6926

Answers (4)

Kamil Kiełczewski
Kamil Kiełczewski

Reputation: 92617

You can use | and while loop

version: "3.9"

services:
  cmd:
    container_name: my-node-cmd-1
    image: node:16.10.0
    volumes:
      - .:/work
    command:
      - bash
      - -c
      - |
        echo "----------------------------------------------"
        echo "To join to CMD, in separate console execute:"
        echo " "
        echo 'docker exec -it my-node-cmd-1 bash -c "cd /work; bash"'
        while true; do sleep 10000; done

Above working example gives access to node cmd in current directory - if you copy it to docker-compose.yml and run by docker compose up you should see

enter image description here

The while loop is infinite but sleep 10s on each iteration. If you remove line with this loop then container will exit with code 0

BONUS

You can get similar effect to above example by using run instead up on following script

version: "3.9"

services:
  # run this container by: docker compose run cmd
  cmd:
    image: node:16.10.0
    volumes:
      - .:/work
    command:
      - bash
      - -c
      - |
        echo "Hello World!"
        cd /work
        bash

Upvotes: 0

Abulafia
Abulafia

Reputation: 1765

Anything you do in CMD will only be visible in the logs, and only per service, so you may as well just watch the logs which I assume is what you're trying to avoid. If you want it to work from the local command line you're going to need to wrap the docker-compose up command.

THE following is NOT fully tested. This is for guidance only. I use the getContainerHealth and waitContainer scripts myself, so can vouch for them. I'm fairly sure I found them on this site, but can't remember where.

Assuming you're waiting for your services to be in a usable state, you could use something similar to this compose file:

docker-compose.yml

services:
  serviceOne:
     // ... the usual stuff
    container_name: serviceOne
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost"]
      interval: 10s
      timeout: 10s
      retries: 3
      start_period: 1s

  serviceTwo:
     // ... the usual stuff
    container_name: serviceTwo
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost"]
      interval: 10s
      start_period: 1s

The commands in the test are the commands you use to define the service is up and running. More info here: https://docs.docker.com/compose/compose-file/#healthcheck

You will probably want different health checks (or at least intervals, timeouts, start_periods, etc) for production and development.

then some bash script that you use instead of docker-compose up:

getContainerHealth () {
  docker inspect --format "{{json .State.Health.Status }}" $1
}

waitContainer () {
  while STATUS=$(getContainerHealth $1); [ $STATUS != "\"healthy\"" ]; do
    if [ $STATUS = "\"unhealthy\"" ]; then
      echo "Failed!"
      exit -1
    fi
    printf .
    lf=$'\n'
    sleep 1
  done
  printf "$lf"
}

waitContainers () {
  waitContainer serviceOne
  waitContainer serviceTwo
  // ... for all services
}

docker-compose up
echo "In progress. Please wait"
waitContainers
echo "Done. Ready to roll."

Upvotes: 3

trolologuy
trolologuy

Reputation: 2035

Have you tried running something like the following directly in the Dockerfile itself ?

RUN echo -e "Your message"

Upvotes: 0

hbousselmi
hbousselmi

Reputation: 11

create a shell file echo.sh that contains echo "Your message"

In Docker file add CMD ["/dockerRepo/echo.sh"]

Upvotes: 1

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