InfluxDB errors by default

[Stuart Bishop]

I'm seeing this in the logs of a deploy without influxdb:

2016/09/02 11:15:20 Database creation failed: Get http://localhost:8086/query?db=&q=CREATE+DATABASE+IF+NOT+EXISTS+%22telegraf%22: dial tcp 127.0.0.1:8086: getsockopt: connection refused

Looks like something is enabled by default that shouldn't be?

[Wouter van Bommel (woutervb)]

The code assumes indeed that an influxdb is always available as output, while it should be optional, and the config part should only be written if the relation is actually established.

Other outputs are supported via yaml config option(s)

[Peter Sabaini (peter-sabaini)]

The [[outputs.influxdb]] config originates from the telegraf package itself. Telegraf is being started with default config on first install, and with the default config present will log the above error.

Later on the charm reconfigures telegraf, and does the right thing:

It removes the outputs.influxdb stanza, and will only add it @when('influxdb-api.available'). Further restarts without influxdb-api.available won't produce the "connection refused" message above.

Arguably this bug should be repointed to the telegraf package for starting telegraf with an overly optimistic default config.

I will close it as invalid for the charm though.