Swarm mode with mode=host and port is already in use by service on another host.

[tlvenn]

Hi,

I am using docker swarm mode (1.13) and I have 2 services A and B.
Both services publish ports using exclusively mode=host and both services have placement constraint on a different server.

Now the issue is that both services listen of port 443. Once the first service starts, the second is failing to start with the following error:

Error response from daemon: rpc error: code = 3 desc = port '443' is already in use by service 'A' (pjo2sx4wx3apaejqhgevpkvqs)

I am guessing there is a check somewhere that does not take into account that service A is using mode=host and so it's not mutually exclusive to run services on the same port anymore as far as the services are not running on the same host.

docker version

Client:
 Version:      1.13.0
 API version:  1.25
 Go version:   go1.7.3
 Git commit:   49bf474
 Built:        Tue Jan 17 09:58:26 2017
 OS/Arch:      linux/amd64

Server:
 Version:      1.13.0
 API version:  1.25 (minimum version 1.12)
 Go version:   go1.7.3
 Git commit:   49bf474
 Built:        Tue Jan 17 09:58:26 2017
 OS/Arch:      linux/amd64
 Experimental: false

[aboch]

I am guessing there is a check somewhere that does not take into account that service A is using mode=host

Right. checkPortConflicts() must be changed to take that into account.

[ginjo]

I also tripped over this issue. Same scenario as the OP (also docker 1.13). I'm trying to publish a service port with mode=host, on a single worker node. However once the port has been published on the manager node, I get the port-already-in-use error. I'm looking for workarounds, other than manually starting up the service with docker run, but not finding anything yet.

[bhdrk]

I have same issue.

[ginjo]

Any updates on this? I tried version 17.04.0-dev, build 3fe2730, but I'm still getting port-in-use error. Happy to help if there's anything I can do...

[tlvenn]

@thaJeztah any chance to get someone from Docker assigned to this issue ? As pointed out by @aboch , the function that need to be patched is checkPortConflicts()

[erinnovations]

+1, same issue here

[ilp]

+1, some issue here too!!!
FATA[0010] The following required ports are already in use on your host - 443.

[aaronlehmann]

Opened moby/swarmkit#2177 for this