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DNSdist monitoring with Netdata

DNSdist is a highly DNS-, DoS- and abuse-aware loadbalancer.

This module monitors load-balancer performance and health metrics.

It collects metrics from the internal webserver.

Used endpoints:

Requirements

For collecting metrics via HTTP, we need enabled webserver.

Metrics

All metrics have "dnsdist." prefix.

MetricScopeDimensionsUnits
queriesglobalall, recursive, emptyqueries/s
queries_droppedglobalrule_drop, dynamic_blocked, no_policy, non_queriesqueries/s
packets_droppedglobalaclpackets/s
answersglobalself_answered, nxdomain, refused, trunc_failuresanswers/s
backend_responsesglobalresponsesresponses/s
backend_commerrorsglobalsend_errorserrors/s
backend_errorsglobaltimeouts, servfail, non_compliantresponses/s
cacheglobalhits, missesanswers/s
servercpuglobalsystem_state, user_statems/s
servermemglobalmemory_usageMiB
query_latencyglobal1ms, 10ms, 50ms, 100ms, 1sec, slowqueries/s
query_latency_avgglobal100, 1k, 10k, 1000kmicroseconds

Configuration

Edit the go.d/dnsdist.conf configuration file using edit-config from the Agent's config directory, which is typically at /etc/netdata.

cd /etc/netdata # Replace this path with your Netdata config directory
sudo ./edit-config go.d/dnsdist.conf

Needs url and password or apikey to access the webserver.

Here is a configuration example:

jobs:
- name: local
url: 'http://127.0.0.1:8083'
headers:
X-API-Key: 'your-api-key' # static pre-shared authentication key for access to the REST API (api-key).

- name: remote
url: 'http://203.0.113.0:8083'
headers:
X-API-Key: 'your-api-key' # static pre-shared authentication key for access to the REST API (api-key).

For all available options, see the dnsdist collector's configuration file.

Troubleshooting

To troubleshoot issues with the dnsdist collector, run the go.d.plugin with the debug option enabled. The output should give you clues as to why the collector isn't working.

  • Navigate to the plugins.d directory, usually at /usr/libexec/netdata/plugins.d/. If that's not the case on your system, open netdata.conf and look for the plugins setting under [directories].

    cd /usr/libexec/netdata/plugins.d/
  • Switch to the netdata user.

    sudo -u netdata -s
  • Run the go.d.plugin to debug the collector:

    ./go.d.plugin -d -m dnsdist

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