Leaving this as a personal memo because I forget every time.
How to Take FreeBSD Crash Dumps
- Add dump settings to /etc/rc.conf
dumpdev="/dev/vtbd0p3"
dumpdir="/var/crash"
Assign the swap area to dumpdev.
Check the device assigned to swap with swapinfo.
# swapinfo
Device 1K-blocks Used Avail Capacity
/dev/vtbd0p3 4194264 0 4194264 0%
It seems dumpdev="AUTO" also works.
- If it’s a one-time thing, you can execute it as follows:
dumpon /dev/vtbd0p3
- Check the current settings
# dumpon -v -l
kernel dumps on vtbd0p3