401 Unauthorised with Telegraf and InfluxDB - database creation failed - even with All Access API tokens?

Hi,

I’m trying to setup Telegraf (1.21.4) with InfluxDB (2.1.1) to capture some statistics from the Telegraf ping and internet_speed plugins.

However, I seem to be repeatedly hitting permissions issues trying to write to the InfluxDB2 instance.

Here is my telegraf configuration:

[[outputs.influxdb_v2]]
#   ## The URLs of the InfluxDB cluster nodes.
#   ##
#   ## Multiple URLs can be specified for a single cluster, only ONE of the
#   ## urls will be written to each interval.
#   ##   ex: urls = ["https://us-west-2-1.aws.cloud2.influxdata.com"]
#   urls = ["http://127.0.0.1:8086"]
    urls = ["http://10.5.1.72:8086"]
#
#   ## Token for authentication.
#   token = ""
    token = "oZSZ0CnbZcwKouMQ3JfR7n7K0vAuMNFaa0rymxpQ6jGQU8ZqHjiHb9Vu5OVf23CeLR7Tytuzg8doVQTo_n_3Vg=="
#
#   ## Organization is the name of the organization you wish to write to; must exist.
#   organization = ""
    organization = "foo"
#
#   ## Destination bucket to write into.
#   bucket = ""
    bucket = "internet-testing"

(I’ve included my token verbatim above, in case I mis-formatted it - obviously will rotate it now…aha).

And in the journalctl -u inf:

Mar 19 07:32:13 foo-monitoring telegraf[3610]: 2022-03-18T20:32:13Z I! Starting Telegraf 1.21.4
Mar 19 07:32:13 foo-monitoring telegraf[3610]: 2022-03-18T20:32:13Z I! Loaded inputs: cpu disk diskio internet_speed kernel mem ping processes swap system
Mar 19 07:32:13 foo-monitoring telegraf[3610]: 2022-03-18T20:32:13Z I! Loaded aggregators:
Mar 19 07:32:13 foo-monitoring telegraf[3610]: 2022-03-18T20:32:13Z I! Loaded processors:
Mar 19 07:32:13 foo-monitoring telegraf[3610]: 2022-03-18T20:32:13Z I! Loaded outputs: influxdb influxdb_v2
Mar 19 07:32:13 foo-monitoring telegraf[3610]: 2022-03-18T20:32:13Z I! Tags enabled: host=foo-monitoring
Mar 19 07:32:13 foo-monitoring telegraf[3610]: 2022-03-18T20:32:13Z I! [agent] Config: Interval:10s, Quiet:false, Hostname:"foo-monitoring", Flush Interval:10s
Mar 19 07:32:13 foo-monitoring telegraf[3610]: 2022-03-18T20:32:13Z W! [outputs.influxdb] When writing to [http://localhost:8086]: database "telegraf" creation failed: 401 Unauthorized
Mar 19 07:32:23 foo-monitoring telegraf[3610]: 2022-03-18T20:32:23Z E! [outputs.influxdb] E! [outputs.influxdb] Failed to write metric (will be dropped: 401 Unauthorized):
Mar 19 07:32:33 foo-monitoring telegraf[3610]: 2022-03-18T20:32:33Z E! [outputs.influxdb] E! [outputs.influxdb] Failed to write metric (will be dropped: 401 Unauthorized):
Mar 19 07:32:43 foo-monitoring telegraf[3610]: 2022-03-18T20:32:43Z E! [outputs.influxdb] E! [outputs.influxdb] Failed to write metric (will be dropped: 401 Unauthorized):
Mar 19 07:32:53 foo-monitoring telegraf[3610]: 2022-03-18T20:32:53Z E! [outputs.influxdb] E! [outputs.influxdb] Failed to write metric (will be dropped: 401 Unauthorized):
Mar 19 07:33:03 foo-monitoring telegraf[3610]: 2022-03-18T20:33:03Z E! [outputs.influxdb] E! [outputs.influxdb] Failed to write metric (will be dropped: 401 Unauthorized):

I’ve tried using both a read/write API token scoped to the bucket (internet-testing, and even an All Access API token, and both seem to give the 401 error.

Did I miss a step somewhere?

Answering this myself - this was PEBKAC…

It appears the InfluxDB 1.x section in my Telegraf configuration was uncommented somehow - so the error messages were coming from that. However, the InfluxDB 2.x output for Telegraf is functioning correctly.

I was about to tell you to check exactly that, as the error message was coming from outputs.influxdb and not outputs.influxdb_v2.
I’m glad you noticed it in the end, I’ll mark your own answer as the solution.