Freebsd

Freebsd tips, useful for / after upgrade

FreeBSD upgrade

root$ freebsd-update fetch
root$ freebsd-update install
root$ freebsd-update upgrade -r 11.2-RELEASE
root$ freebsd-update install # could be long here
root$ shutdown -r now
root$ freebsd-update install  # and voila

Rescue FreeBSD

• boot on liveCD (ubuntu/debian, whatever)
• install qemu-system
• boot on partition

root$ qemu-system-x86_64 -hda /dev/sda -curses -boot c
#For quit qemu: Esc+2, input "quit" and Enter

Cannot “su” ?

If you got:

user$ su 
su: Sorry
exit 1

Take a look if the user is in wheel group

grep user /etc/group

If it’s not, maybe this is the reason you cannot run “su”. To fix this, just add the user to wheel group:

pw usermod user -G wheel

IPFW

https://www.freebsd.org/doc/handbook/firewalls-ipfw.html

See open ports using sockstat

sockstat -4 -l will display listen port on IPv4 only