Display message success after docker-compose up is done - docker

Question

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!

Answer 1

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."

Answer 2

create a shell file echo.sh that contains
echo "Your message"
In Docker file add
CMD ["/dockerRepo/echo.sh"]

Answer 3

Have you tried running something like the following directly in the Dockerfile itself ?
RUN echo -e "Your message"