(fix) use network_mode host for Docker driver

[gmemstr]

This is because the configuration causes the application to try to reach out to the local host (127.0.0.1) but the Docker driver defaults to bridge mode. By explicitly defining host in the config we can reach the redis instance.

I don't know if this was intentional, or a misconfiguration of my setup, but out of the box the examples don't seem to work :)

[MightyCreak]

Thanks! It indeed fixed the issue I had with jobs not able to connect to the Redis server (as described in #3).

[chronicc]

@tunzor Is there a reason this fix is still not merged? The PR fixes a real problem which every person runs into that is starting out with Nomad. The guide leads newcomers into a cul-de-sac relying on this repository.

[tunzor]

Hey all, thanks so much for your interest and help in improving the get started guides!

We updated the guide about a month ago with new instructions that help with the issue around local Docker networking with localhost.

The Create the cluster section has information about networking with localhost (and why it doesn't work) and shows how to use the -network-interface flag to solve the issue. We chose this solution as it keeps the example app jobspecs as generic as possible so that they can also be used for the cloud path in the get started guide.

@gmemstr could you try out the updated guide and see if it works for you? If so, we can close this as resolved. Thanks!

[chronicc]

@tunzor Thank you for the insights. I just want to give the hint, that the guide about the pytechco jobs still refers to using the cluster ip address instead of localhost to reach the web ui.

I guess this causes the main problems in this scenario.

Would't it be better to also update this guide to refer to http://localhost:5000 for visiting the simulation web ui?

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[MattJustMatt]

@tunzor thanks for the added section. On Mac with Homebrew, a service was auto created and started for me. I had erroneously assumed that this service would be bound similar to the example but had to go back. Not sure if it's worth a callout but it was an extra step and some troubleshooting for me.

[shide1989]

Personnaly i'm unable to make the tutorial work. Spent already 3h trying to figure it out, make it all work, change the Docker network mode to "host", but the then the pytechco-web gets unreachable. For now i'll wait for further updates