Wednesday, January 27, 2016

Running FreeBSD in single user mode with zfs on root

Today I bricked a server (long story, etc ...) and I had to fix it in single user mode. The process is very simple.


  • Use the boot loader to enter in single user mode
  • Press Intro to run /bin/sh
  • mount all the zfs volumes: zfs mount -a
  • Mount the ROOT volume read-write: zfs set readonly=off zroot/ROOT/default
  • Fix what you broke
  • Reboot the server

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