Health Monitors - TMOS 201 Flashcards
What are the 3 methods of monitoring?
Simple
Active
Passive
What are the 6 types of monitors?
Address
Application
Content
Performance
Path
Service
What is simple monitoring?
Monitors up/down status using gateway_icmp, icmp, and tcp_echo.
What is active monitoring?
Application traffic of some kind is generated and actively probes the host and expects a specific response back from the node or pool member.
What is passive monitoring?
AKA inland monitoring.
Does not send probes or requests to a host. It relies on client generated traffic and monitors this for failures.
What is the default health monitor interval value?
5 seconds
What is the default health monitor timeout value?
16 seconds
If setting a custom interval and timeout value, what formula should be used?
Interval x3 + 1
Example: 5 x 3 + 1 = 16
5 seconds interval
16 seconds timeout
Where are the monitor logs located?
/var/log/monitors
What is a TCP idle timeout? What is the default timer?
The Idle Timeout setting in the TCP profile specifies the length of time that a connection is idle before the connection is eligible for deletion. If no traffic flow is detected within the idle session timeout, the BIG-IP system can delete the session. The default is 300 seconds.
What is the TCP Keep Alive Interval? What is the default timer?
The Keep Alive Interval setting in the TCP profile is used to adjust the frequency at which the BIG-IP system sends TCP Keep-Alive packets to a remote host for connection validation. The default is 1800 seconds.
What is Availability Requirement?
It is used to specify the minimum number of monitors that must report a pool as being available before the member is defined as being in an up state.
If all of the monitors must report the pool available, select All.
To specify a minimum number, select At Least, and then type the minimum number in the Health Monitors field.
