Bringing up on Docker Swarm doesn't work

[mcowart123]

Describe the bug
When trying to bring up a simple cluster (1 server/1 agent) on our production docker swarm cluster the agent can never connect to the server; it even tries connecting to the wrong IP address. Doing the exact same thing on our standalone test box (minus the deploy restrictions in the compose file) works flawlessly. I even added a placement restriction for the swam to force them to the same node and it doesn't work.

To Reproduce
Production swarm stack file:

`
version: '3.8'

services:
dkron-server:
image: centricdocker.azurecr.io/thirdparty/dkron
ports:
- "10120:8080"
volumes:
- /var/apps/docker-shared/shared-dkron/root:/root
- /media/scripts:/media/scripts
- /var/apps/docker-shared/shared-dkron/dkron-server/data:/data
command: dkron agent --server --log-level=debug --bootstrap-expect=1 --data-dir=/data --node-name dkron-primary
stop_grace_period: 3m
deploy:
replicas: 1
placement:
constraints:
- node.labels.dkron==allowed

dkron-agent:
image: centricdocker.azurecr.io/thirdparty/dkron
depends_on:
- dkron-server
volumes:
- /var/apps/docker-shared/shared-dkron/root:/root
- /media/scripts:/media/scripts
command: dkron agent --retry-join=dkron-server:8946 --log-level=debug --tag agent=true
stop_grace_period: 3m
deploy:
replicas: 1
placement:
constraints:
- node.labels.dkron==allowed
`
Does not work.

Standalone server stack file:
`
version: '3.8'

services:
dkron-server:
image: centricdocker.azurecr.io/thirdparty/dkron
ports:
- "10120:8080"
volumes:
- /var/apps/docker-shared/shared-dkron/root:/root
- /media/scripts:/media/scripts
- /var/apps/docker-shared/shared-dkron/dkron-server/data:/data
command: dkron agent --server --log-level=debug --bootstrap-expect=1 --data-dir=/data --node-name dkron-primary
stop_grace_period: 3m

dkron-agent:
image: centricdocker.azurecr.io/thirdparty/dkron
depends_on:
- dkron-server
volumes:
- /var/apps/docker-shared/shared-dkron/root:/root
- /media/scripts:/media/scripts
command: dkron agent --retry-join=dkron-server:8946 --log-level=debug --tag agent=true
stop_grace_period: 3m
`
This works perfectly.

Expected behavior
The swarm should work and the agent should try to connect to the correct internal IP of 10.0.61.9, but it is trying to connect to 10.0.61.2 instead. The server/web-ui is up.

Screenshots

** Specifications:**

• OS: Linux
• VersionLatest

[kennykarnama]

I think it is related to this issue: moby/moby#41766

[vcastellm]

Long time since I used docker swarm, but not sure if this is a Dkron error, I guess it should be related to swarm, so closing this at this time.

Feel free to reopen in case it's related to Dkron.