Monitoring DNS

This article will help you get the Dns plugin for sd-agent configured and returning metrics

Installing the dns plugin package

Install the dns plugin on Debian/Ubuntu:

sudo apt-get install sd-agent-dns-check

Install the dns plugin on RHEL/CentOS:

sudo yum install sd-agent-dns-check

Read more about agent plugins.

Configuring the agent to monitor DNS

1. Configure /etc/sd-agent/conf.d/dns_check.yaml

init_config:

instances:
  - name: Server Density (com)
    # nameserver: 8.8.8.8   # The nameserver to query, this must be an IP address
    hostname: serverdensity.com # the record to fetch
    # record_type: AAAA   # default is A
  - name: Example (org)
    hostname: example.org

If you do not provide a nameserver the check will use the nameserver configured in the local network settings.

2. Restart the agent

sudo /etc/init.d/sd-agent restart

or

sudo systemctl restart sd-agent

Verifying the configuration
Execute info to verify the configuration with the following:

sudo /etc/init.d/sd-agent info 

or

/usr/share/python/sd-agent/agent.py info

If the agent has been configured correctly you'll see an output such as:

dns
-----
  - instance #0 [OK]
  - Collected * metrics

You can also view the metrics returned with the following command:

sudo -u sd-agent /usr/share/python/sd-agent/agent.py check dns_check

Configuring graphs

Click the name of your server from the Devices list in your Server Density account then go to the Metrics tab. Click the + Graph button on the right then choose the dns metrics to display the graphs. The metrics will also be available to select when building dashboard graphs.

Screen_Shot_2018-01-18_at_11.46.12.png

Monitored metrics

MetricValues
dns.response_time

The response time for DNS query for a given record, tagged by hostname, e.g. 'hostname:example.com'.
second / None
Type: float
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