[inputs.opcua] Telegraf is restarted if opcua server is not available

[mirkocomparetti-synesis]

System info:

Ubuntu desktop 20.04.2 64bit
Ram 4Gb
Influxdb2 2.0.4 (last from ubuntu repos)
Telegraf 1.18.1 (last from ubuntu repos)

Steps to reproduce:

1. Configure the input.opcua plugin to connect to a opcua server
2. keep the opcua server OFF (or use a non existing ip address)
3. start the telegraf service
4. keep an eye on the logs

Expected behavior:

OPCUA connection has to fail gracefully, the telegraf process should still be alive and the opcua plugin has to retry retry after some time.

Actual behavior:

When the opcua plugin fails to connect to the server, the whole telegraf process is restarted and it will eventually fail after some time.

Additional info:

This is what happens in the log: the connection fails and the whole telegraf is reloaded

2021-04-20T06:47:09Z I! Loaded inputs: mqtt_consumer opcua
2021-04-20T06:47:09Z I! Loaded aggregators: merge
2021-04-20T06:47:09Z I! Loaded processors: converter dedup (2x) override (12x) rename starlark (3x)
2021-04-20T06:47:09Z I! Loaded outputs: influxdb_v2 (2x)
2021-04-20T06:47:09Z I! Tags enabled: host=somehost
2021-04-20T06:47:09Z I! [agent] Config: Interval:10s, Quiet:false, Hostname:"somehost", Flush Interval:10s
2021-04-20T06:47:09Z E! [telegraf] Error running agent: could not initialize input inputs.opcua: dial tcp 1.2.3.4:1234: connect: network is unreachable
2021-04-20T06:47:10Z I! Loaded inputs: mqtt_consumer opcua
2021-04-20T06:47:10Z I! Loaded aggregators: merge
2021-04-20T06:47:10Z I! Loaded processors: converter dedup (2x) override (12x) rename starlark (3x)
2021-04-20T06:47:10Z I! Loaded outputs: influxdb_v2 (2x)
2021-04-20T06:47:10Z I! Tags enabled: host=somehost
2021-04-20T06:47:10Z I! [agent] Config: Interval:10s, Quiet:false, Hostname:"somehost", Flush Interval:10s
2021-04-20T06:47:10Z E! [telegraf] Error running agent: could not initialize input inputs.opcua: dial tcp 1.2.3.4:1234: connect: network is unreachable
2021-04-20T06:47:11Z I! Loaded inputs: mqtt_consumer opcua
2021-04-20T06:47:11Z I! Loaded aggregators: merge
2021-04-20T06:47:11Z I! Loaded processors: converter dedup (2x) override (12x) rename starlark (3x)
2021-04-20T06:47:11Z I! Loaded outputs: influxdb_v2 (2x)
2021-04-20T06:47:11Z I! Tags enabled: host=somehost
2021-04-20T06:47:11Z I! [agent] Config: Interval:10s, Quiet:false, Hostname:"somehost", Flush Interval:10s
2021-04-20T06:47:11Z E! [telegraf] Error running agent: could not initialize input inputs.opcua: dial tcp 1.2.3.4:1234: connect: network is unreachable
2021-04-20T06:47:11Z I! Loaded inputs: mqtt_consumer opcua
2021-04-20T06:47:11Z I! Loaded aggregators: merge
2021-04-20T06:47:11Z I! Loaded processors: converter dedup (2x) override (12x) rename starlark (3x)
2021-04-20T06:47:11Z I! Loaded outputs: influxdb_v2 (2x)
2021-04-20T06:47:11Z I! Tags enabled: host=somehost
2021-04-20T06:47:11Z I! [agent] Config: Interval:10s, Quiet:false, Hostname:"somehost", Flush Interval:10s
2021-04-20T06:47:11Z E! [telegraf] Error running agent: could not initialize input inputs.opcua: dial tcp 1.2.3.4:1234: connect: network is unreachable
2021-04-20T06:59:32Z I! Loaded inputs: mqtt_consumer opcua
2021-04-20T06:59:32Z I! Loaded aggregators: merge

[mirkocomparetti-synesis]

With latest version telegraf is not restarted anymore, but it does not work at all if the opcua endpoint is not responding/missing

[srebhan]

@mirkocomparetti-synesis can you please test with PR #9524. Not sure if it helps, but it fixes reconnect. Otherwise, what is the error message you are getting?