Discuss F5 Networks F5CAB5 Exam Topic 4 Question 11

A pool member is exhibiting frequent up-and-down state changes, leading the BIG-IP Administrator to suspect a health monitor issue. Which specific log file should the BIG-IP Administrator review to diagnose the problem?

A/var/log/tmm

B/var/log/ltm

C/var/log/syslog

D/var/log/audit

Suggested Answer: B

The Local Traffic Manager (LTM) log file is the primary repository for all events related to load balancing objects, including virtual servers, pools, and nodes.

Monitor Logging: When a health monitor marks a pool member as 'UP' or 'DOWN,' the system generates a log entry in /var/log/ltm.

Diagnosing Flaps: To troubleshoot 'flapping' (frequent state changes), an administrator would look for messages like 01010028:3: Pool /Common/http_pool member /Common/10.10.1.1:80 monitor status down followed quickly by an 'up' status. This log provides the timestamp and the specific monitor that triggered the state change.

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24 comments · newest first

Gerri 5 days ago

But A) is more about traffic, not health checks. B) is more relevant.

Irene 10 days ago

I’m not so sure. What about A) /var/log/tmm? It logs traffic management.

Javier 15 days ago

Agreed, B) makes sense. It tracks pool member status changes.

Buck 20 days ago

I think it's B) /var/log/ltm. That's where health monitor logs are.

Gary 25 days ago

I’m not sure about C) /var/log/syslog. It’s too general for this issue.

Billye 1 month ago

I lean towards B) too. It's the best for diagnosing pool member states.

Eloisa 1 month ago

But isn't B) more specific for monitoring issues?

Bev 1 month ago

I feel like A) /var/log/tmm could also be useful for troubleshooting.

Gwenn 2 months ago

Agreed, B) makes sense. It shows traffic and health status.

Emmanuel 2 months ago

I think it's B) /var/log/ltm. That's where the health monitor logs are.

Zita 2 months ago

100% agree, /var/log/ltm is where the action is!

Mendy 2 months ago

Wait, are you sure it’s not /var/log/audit? That seems relevant too.

Lenna 2 months ago

/var/log/syslog is too general for this specific issue.

Wilbert 2 months ago

I thought /var/log/tmm was the go-to for this?

Salome 3 months ago

Definitely check /var/log/ltm for health monitor issues.

Casie 3 months ago

I agree, /var/log/ltm is where the real info is.

Lanie 3 months ago

Surprised /var/log/audit isn't the answer, thought it tracked everything!

Donte 3 months ago

/var/log/syslog is too general for this kind of problem.

Linwood 3 months ago

I thought /var/log/tmm was the go-to for this?

Harris 3 months ago

Definitely check /var/log/ltm for health monitor issues.

Major 4 months ago

I keep mixing up the log files. Is /var/log/syslog even related to health monitors, or is it more general?

Samira 4 months ago

I practiced a similar question, and I feel like /var/log/ltm was the answer. It seems to be the go-to for monitoring issues.

Brock 4 months ago

I'm not entirely sure, but I remember something about /var/log/tmm being related to traffic management. Could that be relevant here?

Gaynell 5 months ago

I think the log file we need to check is /var/log/ltm, since it deals with load balancing and health monitors, right?

F5 Networks F5CAB5 Exam - Topic 4 Question 11 Discussion