Added two examples with labels in docker-compose.yml

[pascalandy]

What does this PR do?

Doc: Added two example / Using labels in docker-compose.yml

Motivation

#563 (comment)

More

null

Additional Notes

#563 (comment)

[MindTooth]

Maybe add a small notice regarding $$. So that there is an explicit mention.

Nice PR otherwise. Been missing such section a long time. 👍

[pascalandy]

I don't know what to say regarding the $$. Please enlighted me :)

[MindTooth]

I'll look into maybe writing some text. I think the official documentation have some great stuff though.

Source: https://docs.docker.com/compose/compose-file/#variable-substitution

[pascalandy]

Thanks, I'll add a note about it. Need to run this morning!

[ldez]

@pascalandy could you rebase on v1.7 and change the base branch of the PR to v1.7 (edit button on the top of the PR)

[pascalandy]

Add more details and switched to branch 1.7
Hope everything is good now :)

[dduportal]

Hello @pascalandy ,

thanks a lot for your time on this proposal.
Great work!

I've put a few language (minor) reviews to fix.

Also, would it be possible to create a new User Guide's page named "Using Labels with Docker-Compose"?
Because this content deserves a dedicated page, instead of being lost on the bottom of the "Examples" pages.

If you need help on doing this, do not hesitate to ping me on the community's Slack at https://slack.traefik.io/ : I will happily allocate some time with you to work on this.

Thanks again!

[pascalandy]

I agree!

would it be possible to create a new User Guide's page named "Using Labels with Docker-Compose"?

Let's start by merging this first :)

[dduportal]

Hello @pascalandy , after a discussion with other maintainers, it sounds like that instead of a very specific example in the user guide section (which is already "complicated"),
updating the section https://docs.traefik.io/configuration/backends/docker/#using-docker-compose with a note specifying the $$ trick could be a simple but valuable information.

We fear the maintenance effort of a full docker-compose.yml as you provided (there are already too much in the User Guides ;) ) could be a pain.

Is there another intent in this user guide you wanted to underline (a use case)? If, could you details the intent?

[pascalandy]

The use case was from months of conversation on #563 (comment). The regex ability is a powerful one.

Maybe I could only showcase the labels and not the whole docker-compose file. I personally prefer a full blast example :)

[dduportal]

Hello @pascalandy , my apologies for the delay of response.

Thanks for this contribution. It is LGTM.

We might want to rework example section later, but right now it is ok.

[ldez]

LGTM

[nmengin]

LGTM

[MindTooth]

Should this not be redirected instead?

[pascalandy]

correct redirected