FreeBSD: How to Resize Root Partition

Set debugflags

sysctl kern.geom.debugflags=16

Resize root partition

Show the current partition

gpart show
=>     40  8388528  da0  GPT  (30G) [CORRUPT]
       40     1024    1  freebsd-boot  (512K)
     1064  7965696    2  freebsd-ufs  (3.8G)
  7966760   421808       - free -  (206M)

Apply the partition

/etc/rc.d/growfs onestart

Growing root partition to fill device
Adding swap partition
da0 recovered
da0p3 added
da0p2 resized
super-block backups (for fsck_ffs -b #) at:
 8963328, 10243776, 11524224, 12804672, 14085120, 15365568, 16646016, 17926464, 19206912, 20487360, 21767808,
 23048256, 24328704, 25609152, 26889600, 28170048, 29450496, 30730944, 32011392, 33291840, 34572288, 35852736,
 37133184, 38413632, 39694080, 40974528, 42254976, 43535424, 44815872, 46096320, 47376768, 48657216, 49937664,
 51218112, 52498560, 53779008, 55059456, 56339904
Metadata value stored on da0p3.
Done.

Check the result

df -h
Filesystem         Size    Used   Avail Capacity  Mounted on
/dev/gpt/rootfs     26G    2.2G     22G     9%    /
devfs              1.0K      0B    1.0K     0%    /dev

Change back the debugflags

sysctl kern.geom.debugflags=0

Swap partition

If you've swap partition, please remove it before resize the root partition.

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