How do you check if my bigip was forced offline or entered into failover

e.g.

 tmsh run sys failover standby at active unit

[root@ve11a:Active:In Sync] config  tail -f /var/log/ltm
Dec 31 01:54:57 ve11a notice sod[6270]: 010c0044:5: Command:  go standby tmsh.
Dec 31 01:54:57 ve11a notice sod[6270]: 010c0052:5: Standby for traffic group /Common/traffic-group-1.
Dec 31 01:54:57 ve11a notice sod[6270]: 010c0018:5: Standby

 tmsh run sys failover offline at active unit

[root@ve11a:Active:In Sync] config  tail -f /var/log/ltm
Dec 31 01:56:14 ve11a notice sod[6270]: 010c0044:5: Command:  go offline all tmsh.
Dec 31 01:56:14 ve11a notice sod[6270]: 010c0055:5: Forced offline for traffic group /Common/traffic-group-1.
Dec 31 01:56:14 ve11a notice sod[6270]: 010c003f:5: Forced offline

On WebUI, you can see it by differents ways.

The first one would be to open a browser on management page, it will print the status next to the F5 icon on left top corner.

The second way you can have it if you are on a cluster, is in devices parameters. For example, you are on the active member and you want to know the status of the other member.

Tks!! But, How do I see the exact time that happened?

tks

Login to GUI of the box. Left hand top most corner, you see the f5 logo. The status is shown either offline or forced offline respective to the mode.

I understand this, I wonder if my f5 reboot or changed to standby a few hours ago. tks

If you mean to ask what triggered the failover, it needs to be checked from the logs (whether manual or system on its own triggered the failover). If you manually forced to be offline, the status shows that forced offline.

But in the log ltm I see it?

Tks very much for answers!

In the logs from GUI. Click System - > 1. Packet Filter 2. Local Traffic 3. Audit.

And CLI directories are /var/log/messages, /var/log/ltm, to check the logs.