Simple Echo Service on Docker Swram

create-and-use-echo-service.sh

# Create an 'echo' service on a Swarm that replies back whatever you send it
docker service create --name echo --publish '8000:8' busybox:1.29 nc -v -lk -p 8 -e /bin/cat

# talk to the service, assuming you're on a Swarm node; change localhost to a Swarm node hostname if remote
echo "hello netcat my old friend..." |  nc localhost -w 3 8000
echo "i've come to test connection behavior again." |  nc localhost -w 3 8000