docker compose "extra_hosts" alternative in docker engine swarm mode

[viveky4d4v]

In docker compose file i was able to declare a domain & IP like below -

extra_hosts:
  - "mshost:10.4.12.31"
  - "mongodb DEV-MONGODB:10.250.12.35"

I want to know the alternative to this while using command in docker engine swarm mode .

 "docker service create ...."

[aluzzardi]

/cc @dnephin @icecrime @mrjana

Do we want to add this into the ContainerSpec? (that's --add-host)

[dnephin]

If it works, I guess it doesn't hurt to add it?

[yongtang]

This is loosely related to #27567.

[icecrime]

Makes sense to me. (Cc @vdemeester)

[vdemeester]

Make sence to me too 👼

[yongtang]

I can work on this issue once #27567 is merged in.

[yongtang]

#dibs

[yongtang]

Added a PR #28031. The flag --add-host conforms todocker runthough other suggestions are welcomed. No flag has been added todocker service updateyet (not sure about-add/-rm` case).

[dtmistry]

Is this feature available in 1.13.0-rc1 ?

[yongtang]

@dtmistry The PR has been merged in. You could use docker service create --host to specify additional extra hosts in 1.13.0-rc1.

[dtmistry]

@yongtang Thanks. I did not see this issue referenced in the 1.13.0-rc1 release notes. So just wanted to make sure.

[thaJeztah]

@dtmistry you're right, it was missing in the changelog. I'm working on updates to the changelog for changes we missed, so I'll add it