docker stack deploy 'domainname' unsupported

[fedaykin]

• This is a bug report
• This is a feature request
• I searched existing issues before opening this one

Expected behavior

'domainame' per service is supported per the documentation:
"domainname, hostname, [...]
Each of these is a single value, analogous to its docker run counterpart."

Actual behavior

Ignoring unsupported options: domainname

Steps to reproduce the behavior

docker stack deploy --compose-file docker-compose.yml test

docker-compose.yml:

version: '3'
services:
  test:
    image: alpine
    domainname: foo.com

Output of docker version:

Client:
 Version:      17.06.2-ce
 API version:  1.30
 Go version:   go1.8.3
 Git commit:   cec0b72
 Built:        Tue Sep  5 20:00:17 2017
 OS/Arch:      linux/amd64

Server:
 Version:      17.06.2-ce
 API version:  1.30 (minimum version 1.12)
 Go version:   go1.8.3
 Git commit:   cec0b72
 Built:        Tue Sep  5 19:59:11 2017
 OS/Arch:      linux/amd64
 Experimental: false

Output of docker info:

Containers: 7
 Running: 2
 Paused: 0
 Stopped: 5
Images: 16
Server Version: 17.06.2-ce
Storage Driver: aufs
 Root Dir: /var/lib/docker/aufs
 Backing Filesystem: extfs
 Dirs: 162
 Dirperm1 Supported: true
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins: 
 Volume: local
 Network: bridge host macvlan null overlay
 Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog
Swarm: active
 NodeID: jmjplhopudpoe18lparcabavw
 Is Manager: true
 ClusterID: q8isixp4guj1biwokwx511fip
 Managers: 1
 Nodes: 1
 Orchestration:
  Task History Retention Limit: 5
 Raft:
  Snapshot Interval: 10000
  Number of Old Snapshots to Retain: 0
  Heartbeat Tick: 1
  Election Tick: 3
 Dispatcher:
  Heartbeat Period: 5 seconds
 CA Configuration:
  Expiry Duration: 3 months
  Force Rotate: 0
 Root Rotation In Progress: false
 Node Address: 10.0.2.15
 Manager Addresses:
  10.0.2.15:2377
Runtimes: runc
Default Runtime: runc
Init Binary: docker-init
containerd version: 6e23458c129b551d5c9871e5174f6b1b7f6d1170
runc version: 810190ceaa507aa2727d7ae6f4790c76ec150bd2
init version: 949e6fa
Security Options:
 apparmor
 seccomp
  Profile: default
Kernel Version: 4.10.0-33-generic
Operating System: Linux Mint 18.2
OSType: linux
Architecture: x86_64
CPUs: 3
Total Memory: 11.73GiB
Name: REDACTED
ID: NXAO:QMNB:R5C4:SVDZ:YTTF:CGOP:RZFR:YMBL:Z2DQ:B63V:QIBJ:MDT4
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): false
Registry: https://index.docker.io/v1/
Experimental: false
Insecure Registries:
 127.0.0.0/8
Live Restore Enabled: false

WARNING: No swap limit support

Additional environment details (AWS, VirtualBox, physical, etc.)