Manual Chapter : Monitoring DNS application service data

Applies To:

Show Versions Show Versions

BIG-IQ Centralized Management

  • 8.0.0
Manual Chapter

Monitoring DNS application service data

Monitoring DNS application service data

DNS load balances global resources to control and distribute application traffic according to your policies. Monitoring DNS application service data allows you to evaluate how your DNS configuration manages traffic. You can use the charts to evaluate the DNS application service to your application's GSLB domain.
To view DNS traffic data, go to
Applications
APPLICATIONS
<Application Name>
<DNS Application Service>
. From the DNS application service's dashboard, select the
FQDN
(domain name) option at the center of the screen. Ensure you are on the ANALYTICS tab, to view data. For more information about editing your DNS service properties or GSLB configuration, see
Managing DNS and DNS GSLB objects using BIG-IQ
.

DNS Application service charts

This table describes the menu options and charts found in the DNS application service dashboard (
Applications
APPLICATIONS
<Application Name>
<DNS Application Service>
). Select the option marked in the image to view charts at the bottom of the screen. These charts display the trends of DNS traffic within your application's domain.
ANALYTICS Menu Option
Chart Title
Description
DNS RPS
Requests (average/sec)
The number of DNS name resolution requests per second the BIG-IP system handles based on the rate-limited license installed on the system.
Metric Unit: Average DNS requests per second
Legend:
Requests: The average number of DNS requests per second.
Resolved: The average number of resolved DNS requests per second.
Persisted: The average number of persistent DNS requests. When DNS persistence is enabled it ensures that when a local DNS makes repetitive requests on behalf of a client, the BIG-IP system reconnects the client to the same resource as previous requests
Dropped: The average number of dropped DNS requests per second.
DNS Load Balancing Decisions
Load Balancing Decisions (average/sec)
The average number of DNS requests per second, based on the most common load balancing methods applied to DNS traffic.
Metric Unit: Average DNS requests per second
Legend:
Top load balancing methods

DNS Dimensions and Metrics

The following list defines the metrics gathered to monitor DNS load balancing services and the dimension aspects from which data is observed. The information provided is found in the dimensions pane tables with the screens that display DNS GSLB data. You use this information to filter the on-screen data by specific dimension objects. For example, if you would like to view data that pertains to specific virtual servers. It is important note that all metric data is displayed as a unit over the time period selected for the screen.

DNS Dimensions

The following defines the dimensions found in the dimensions pane that report DNS service data.
BIG-IP Host Names
The name of each BIG-IP system that processed the monitored transactions.
Wide IP Names
The unique names assigned to your wide IPs.
Sync Groups
The names of configured BIG-IP DNS synchronization groups. These are a collection of multiple BIG-IP DNS systems (running the same version) that synchronize and communicate BIG-IP DNS configuration settings and metrics information.

DNS Metrics

TCP metrics reflect the connection volume, connection duration, responses, and contents of the TCP connections to your managed BIG-IP systems. Metric sets categorize the metric data according to an aspect of the TCP connection. The table below defines the metric set and the kind of metric data collected.
Metric Set
Metric Set Description
Metric
Metric Description
Load Balancing Decisions
The pool-level load balancing method applied to DNS name resolution requests
Preferred
The first load balancing method BIG-IP DNS uses to return the IPaddress of a virtual server in response to a DNS name resolution request. The preferred method can be either static or dynamic.
Alternate
The load balancing method for DNS requests when the preferred method fails. The alternate method can be only static.
Fallback
The load balancing method for DNS requests when the alternate fails to return a valid resource in response to a DNS name resolution request. The fallback method can be either static or dynamic.
CNAME Resolution
The DNS name resolution requests with a CNAME query against a CNAME wide IP. The request was applied to topology load balancing at the wide IP level to make a pool selection.
Return to DNS
BIG-IP DNS immediately distributes DNS name resolution requests to an LDNS for resolution.
Return from DNS
DNS name resolution requests that are immediately returned to the LDNS for resolution.
Requests
The status of requests to your DNS server.
Requests
The overall average number of DNS requests over the selected period of time.
Persisted
The average number of DNS requests that maintained a persistent connection over the selected period of time.
Dropped
The average number of dropped DNS requests over the selected period of time.
Resolved
The average number of resolved DNS requests over the selected period of time.