README
¶
DNSdist collector
Overview
DNSdist is a highly DNS-, DoS- and abuse-aware loadbalancer.
This collector monitors load-balancer performance and health metrics.
It collects metrics from the internal webserver.
Used endpoints:
Collected metrics
Metrics grouped by scope.
The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.
global
These metrics refer to the entire monitored application.
This scope has no labels.
Metrics:
| Metric | Dimensions | Unit |
|---|---|---|
| dnsdist.queries | all, recursive, empty | queries/s |
| dnsdist.queries_dropped | rule_drop, dynamic_blocked, no_policy, non_queries | queries/s |
| dnsdist.packets_dropped | acl | packets/s |
| dnsdist.answers | self_answered, nxdomain, refused, trunc_failures | answers/s |
| dnsdist.backend_responses | responses | responses/s |
| dnsdist.backend_commerrors | send_errors | errors/s |
| dnsdist.backend_errors | timeouts, servfail, non_compliant | responses/s |
| dnsdist.cache | hits, misses | answers/s |
| dnsdist.servercpu | system_state, user_state | ms/s |
| dnsdist.servermem | memory_usage | MiB |
| dnsdist.query_latency | 1ms, 10ms, 50ms, 100ms, 1sec, slow | queries/s |
| dnsdist.query_latency_avg | 100, 1k, 10k, 1000k | microseconds |
Setup
Prerequisites
Enable DNSdist's built-in Webserver
For collecting metrics via HTTP, you need to enable the built-in webserver.
Configuration
File
The configuration file name is go.d/dnsdist.conf.
The file format is YAML. Generally, the format is:
update_every: 1
autodetection_retry: 0
jobs:
- name: some_name1
- name: some_name1
You can edit the configuration file using the edit-config script from the
Netdata config directory.
cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/dnsdist.conf
Options
The following options can be defined globally: update_every, autodetection_retry.
Config options
| Name | Description | Default | Required |
|---|---|---|---|
| update_every | Data collection frequency. | 1 | |
| autodetection_retry | Re-check interval in seconds. Zero means not to schedule re-check. | 0 | |
| url | Server URL. | http://127.0.0.1:8083 | yes |
| username | Username for basic HTTP authentication. | ||
| password | Password for basic HTTP authentication. | ||
| proxy_url | Proxy URL. | ||
| proxy_username | Username for proxy basic HTTP authentication. | ||
| proxy_password | Password for proxy basic HTTP authentication. | ||
| timeout | HTTP request timeout. | 1 | |
| method | HTTP request method. | GET | |
| body | HTTP request body. | - | |
| headers | HTTP request headers. | ||
| not_follow_redirects | Redirect handling policy. Controls whether the client follows redirects. | no | |
| tls_skip_verify | Server certificate chain and hostname validation policy. Controls whether the client performs this check. | no | |
| tls_ca | Certification authority that the client uses when verifying the server's certificates. | ||
| tls_cert | Client TLS certificate. | ||
| tls_key | Client TLS key. |
Examples
An example configuration.
Config
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).
Note: When you define multiple jobs, their names must be unique.
Collecting metrics from local and remote instances.
Config
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'
Troubleshooting
Debug mode
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.ddirectory, usually at/usr/libexec/netdata/plugins.d/. If that's not the case on your system, opennetdata.confand look for thepluginssetting under[directories].cd /usr/libexec/netdata/plugins.d/ -
Switch to the
netdatauser.sudo -u netdata -s -
Run the
go.d.pluginto debug the collector:./go.d.plugin -d -m dnsdist
Documentation
Source Files