Manual Chapter :
Configuring Logging of Global Server Load Balancing Decisions
Applies To:
Show Versions
BIG-IP LTM
- 17.0.0, 16.1.5, 16.1.4, 16.1.2, 16.1.1, 16.1.0, 16.0.1, 16.0.0
BIG-IP DNS
- 17.0.0, 16.1.5, 16.1.4, 16.1.2, 16.1.1, 16.1.0, 16.0.1, 16.0.0
Configuring Logging of Global Server Load Balancing Decisions
About logging global
server load-balancing decisions
When BIG-IP DNS receives a DNS
query for a wide IP, in order to send a response, the system makes a load-balancing decision. The
decision is based on the load-balancing method configured on the wide IP, the number of pools
associated with the wide IP, and the applicable number of members in each pool.
You can send information about how BIG-IP DNS made the load-balancing
decision to the high-speed remote logs; reviewing the logs can help determine how to fine-tune
your network.
Configuring logs
for global server load-balancing decisions
Ensure that at least one wide IP exists in the BIG-IP DNS configuration, and that
high-speed remote logging is configured on the device.
When you want to view the global server
load-balancing decisions made by BIG-IP DNS in the high-speed remote logs, configure the
verbosity of the information that displays in the logs.
- On the Main tab, click .The Wide IP List screen opens.
- Click the name of the wide IP you want to modify.
- From the General Properties list, selectAdvanced.
- For theLoad-Balancing Decision Logsetting, select the check boxes of the options that you want to include in the high-speed remote logs.Check-box optionLog informationPool SelectionThe pool selected to answer a DNS request, and why the pool was selected.Pool TraversalThe pools in the wide IP considered during the load-balancing decision, and why the pool was selected.Pool Member SelectionThe pool member selected to answer a DNS request, and why the member was selected.Pool Member TraversalThe members of the pool considered during the load-balancing decision, and why the member was selected.Example log for a wide IP configured for Ratio load balancing whenLoad-Balancing Decision Logis set to onlyPool Selection:2013-03-14 15:40:05 bigip1.com to 10.10.10.9#34824: [wip.test.net A] [ratio selected pool (pool_b) with the first highest ratio counter (1)]Example log for a wide IP configured for Ratio load balancing whenLoad-Balancing Decision Logis set to bothPool SelectionandPool Traversal:2013-03-14 16:18:41 bigip1.com from 10.10.10.9#35902 [wip.test.net A] [ratio selected pool (pool_a) - ratio counter (0) is higher] [ratio skipped pool (pool_b) - ratio counter (0) is not higher] [ratio reset IPv4 ratio counter to original ratios - the best had zero ratio count] [ratio selected pool (pool_a) - ratio counter (1) is not higher] [ratio selected pool (pool_b) - ratio counter (1) is not higher] [ratio selected pool (pool_a) with the first highest ratio counter (1)]
