add docker swarm mode support

[pdemagny]

Signed-off-by: Pierre DEMAGNY pdemagny@printoclock.com

[xcompass]

Looks good to me. Though I'm never run swarm mode. So I may not be in a good position to review.

[pichouk]

@pdemagny Thanks for your help !

[pichouk]

LGTM, but with few suggestions.
One question : did you test this on a Docker Swarm cluster ? I have no Swarm cluster so I cannot test.

Another thing is that it could be better to add your docker-swarm.yml file under a new /contrib/swarm/ directory on the repository. Usually contribution like this are on a specific folder. Don't forget to modify path on README and volumes also.

[pichouk]

Why not using the mattermost/mattermost-prod-web image ?

[pichouk]

Good point here, but is that necessary to add this to this PR ?

To keep a correct Git history I will prefer to remove this changes from this Pull Request and to open a new one just for this (or if you don't want, I'll do the commit by myself). I will accept directly ;)

[pichouk]

Also, it seems that mattermod bot is not working (@jasonblais ?) and didn't post the comment about Mattermost CLA.
So @pdemagny can you please sign the Mattermost CLA ? More information about this is available on another PR comment #171 (comment)

[jasonblais]

Thanks @pichouk, posted a note about mattermod in the Developers channel: https://pre-release.mattermost.com/core/pl/8k1wnzk6ppb6pmppuocueqt6kc

[pdemagny]

@pichouk Yes ofc i did test it, i wrote it & ran it within a single node swarm with ssl enabled using letsencrypt, tested a few integrations (fabric & jenkins).
I didn't realize there was a mattermost-prod-web image. I'll use it instead of nginx image, which will make the change on docker-entry.sh irrelevant, so i'll remove it. I had other improvements to make anyway, so i'll make the changes later this week or next week.
I'm not a mattermost user/installer normally (which is why i did this, to try it :p), so i'm not familiar with mattermod, but i'll try to look into it too.

[hmhealey]

I'm just going to do my best Mattermod impression here since it's not going to pick up this PR now that it's already open.

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[pichouk]

@pdemagny Great ! Ping me when you will need another review :)

For the mattermod stuff, it's just a bot that ask you to sign CLA (like @hmhealey does :) ). I can see that you sign it, so it's good now ;)

[pdemagny]

@pichouk actually, ping ;)

[pdemagny]

Using official image made my modifications to docker-entry.sh irrelevant as expected.
More importantly, using it also made use of docker configs useless too, which means that this stack file is not tied to docker 17.06+ anymore.

[pichouk]

Good for me !

Thanks a lot for this contribution ! 👍 😄