apache2 relation doesn't properly configure either apache2 or telegraf

[Junien F]

Hi,

When related to apache2, telegraf generates a vhost stanza starting with :

<VirtualHost 127.0.0.1:8080>
    ServerName 127.0.0.1
[...]

However, in the telegraf plugin config, the following is done :

addr = rel['private-address']
url = 'http://{}:{}/server-status?auto'.format(addr, port)

And 'private-address' is never 127.0.0.1.

So if you have another vhost listening on port 8080, it's possible it will get the telegraf requests for server-status, which doesn't work.

I don't see why we don't use 127.0.0.1 all the time in the telegraf apache2 plugin config, would that break some configurations ?

Thanks

[Xav Paice (xavpaice)]

Confirmed, in apache_input(apache) addr = rel['private-address'] (the relation private-address) and that could be switched to localhost, if we're sure that we don't want to have telegraf monitor non-local Apache instances. If we do, then we need to fix the vhost template which has 127.0.0.1 hardcoded in.

[Haw Loeung (hloeung)]

Also, we'll want a 'Listen 127.0.0.1:8080' in ports.conf.

[Eric Chen (eric-chen)]

This issue was pending long time. Is it still valid?

Furthermore, soon or later, the monitoring system will migrate to COS. Telegraf will be replaced by grafana-agent.
(https://charmhub.io/topics/canonical-observability-stack)

[Eric Chen (eric-chen)]

Tag it as won't fix. But welcome to reopen it if anyone encounter this issue again.

[Haw Loeung (hloeung)]

Yeah, it's still valid. Re-opening.