How to disable network generation on docker stack deploy - docker

Question

I am deploying a compose file onto the UCP via:
docker stack deploy -c docker-compose.yml custom-stack-name
In the end I want to deploy multiple compose files (each compose file describes the setup for a separate microservice) onto one docker network e.g. appsnetwork
version: "3"
services:
service1:
image: docker/service1
networks:
- appsnetwork
customservice2:
image: myprivaterepo/imageforcustomservice2
networks:
- appsnetwork
networks:
appsnetwork:
The docker stack deploy command automatically creates a new network with a generated name like this: custom-stack-name_appsnetwork
What are my options?

Answer 1

Try to create the network yourself first
docker network create --driver=overlay --scope=swarm appsnetwork
After that make the network external in your compose
version: "3"
services:
service1:
image: nginx
networks:
- appsnetwork
networks:
appsnetwork:
external: true
After that running two copies of the stack
docker stack deploy --compose-file docker-compose.yml stack1
docker stack deploy --compose-file docker-compose.yml stack2
Docker inspect for both shows IP in same network
$ docker inspect 369b610110a9
...
"Networks": {
"appsnetwork": {
"IPAMConfig": {
"IPv4Address": "10.0.1.5"
},
"Links": null,
"Aliases": [
"369b610110a9"
],
$ docker inspect e8b8cc1a81ed
"Networks": {
"appsnetwork": {
"IPAMConfig": {
"IPv4Address": "10.0.1.3"
},
"Links": null,
"Aliases": [
"e8b8cc1a81ed"
],