loki: ability to serve off non root path

[adamdecaf]

It's somewhat common to deploy services like loki off the web root (i.e. infra.corp.io/loki) when used with auth proxies. I'm currently unable to find a configuration for doing so.

Prometheus offers the following config:

--web.external-url=https://infra.corp.io/prometheus/

Looking at the webworks server config I don't see support already baked in for that either. Do you know if that's true? Would this be accepted into loki? I'll try and submit a patch.

[tomwilkie]

This is something we’d be keen on, yes! I guess it probably belongs in weaveworks/common/server.

[bboreham]

Similar to cortexproject/cortex#778 ?

[adamdecaf]

Yep. That issue looks to be the same goal as this one.

[adamdecaf]

It looks like the package for this is running off @tomwilkie's fork, is there work needed to merge those together?

[[constraint]]
  name = "github.com/weaveworks/common"
  source = "github.com/tomwilkie/weaveworks-common"
  branch = "dev"

[tomwilkie]

@adamdecaf sorry about that - need weaveworks/common#146 merging before we can go back to master. Shouldn't be long now!

[tomwilkie]

#146 is merged now - @gouthamve or @adamdecaf, want to update the vendoring?

[adamdecaf]

@tomwilkie Done! #211

[ArthurSens]

Does the version v0.2.0 provides any command line flag like --web.external-url from prometheus already? Or is it comming out with version v0.3.0?

[adamdecaf]

There's -server.path-prefix=/loki/

[cloudam]

helm upgrade --install loki loki/loki-stack --namespace=monitoring -server.path-prefix=/loki/
Error: unknown shorthand flag: 's' in -server.path-prefix=/loki/