ZFS root install

install.sh

# Based on http://www.aisecure.net/2012/01/16/rootzfs/ and 
# @vermaden's guide on the forums

# set your disks here
DISKS="ada0 ada1"

# where will we fetch the install from?
FTPURL="ftp://ftp.freebsd.org/pub/FreeBSD/releases/amd64/10.1-RELEASE"

# the hostname this computer will have:
HOSTNAME="tallboy.example.org"

# the primary IP address for this server
IP="10.5.0.1"

# the netmask for this server
NETMASK="255.255.255.248"

# the default gateway for this server i.e. defaultrouter
GATEWAY="10.0.0.1"

gmirror load
gmirror stop swap

NUM=-1
for I in ${DISKS}; do
  NUM=$(($NUM + 1))
  gpart destroy -F ${I}
  gpart create -s gpt ${I}
  gpart add -a4k -s512k -t freebsd-boot -l bootcode${NUM} ${I}

  # create our swap partition
  gpart add -a4k -b1m -s 8g   -t freebsd-swap -l swap${I} ${I}

  #
  # note: not using all the disk, on purpose, adjust this size for your HDD
  #
  gpart add      -s 455G -t freebsd-zfs  -l disk${NUM} ${I}
  
  gpart bootcode -b /boot/pmbr -p /boot/gptzfsboot -i 1 ${I}
  gnop create -S 4096 /dev/gpt/disk${NUM}
done

# create our gmirror for swap
gmirror label -F -h -b round-robin swap /dev/gpt/swap*

# create our main pool, based on those nop... which gets us well aligned.
zpool create -f -O mountpoint=none    \
                -O canmount=off       \
                -O atime=off          \
                -O checksum=fletcher4 \
                -o cachefile=/tmp/zpool.cache    \
                zroot mirror /dev/gpt/disk*.nop
                
zpool export zroot

# now, drop those nops....
NUM=-1
for I in ${DISKS}; do
  NUM=$(($NUM + 1))
  gnop destroy /dev/gpt/disk${NUM}.nop
done

# import again (in previous scripts, this was altroot=/mnt
zpool import -o altroot=/mnt -o cachefile=/tmp/zpool.cache zroot
zfs set mountpoint=none    zroot
zfs set checksum=fletcher4 zroot
zfs set atime=off          zroot

zfs create -o mountpoint=none                                       zroot/bootenv
zfs create -o mountpoint=/                                          zroot/bootenv/default
zfs create -o mountpoint=/tmp -o compression=lz4 -o setuid=off      zroot/tmp
zfs create -o mountpoint=/usr -o canmount=off                       zroot/usr
zfs create                                                          zroot/usr/local
zfs create                                          -o setuid=off   zroot/usr/home
zfs create -o compression=lz4                       -o setuid=off   zroot/usr/ports
zfs create -o compression=off       -o exec=off     -o setuid=off   zroot/usr/ports/distfiles
zfs create -o compression=off       -o exec=off     -o setuid=off   zroot/usr/ports/packages
zfs create -o compression=lz4       -o exec=off     -o setuid=off   zroot/usr/src
zfs create                                                          zroot/usr/obj
zfs create -o mountpoint=/var                                       zroot/var
zfs create -o compression=lz4       -o exec=off     -o setuid=off   zroot/var/crash
zfs create                          -o exec=off     -o setuid=off   zroot/var/db
zfs create -o compression=lz4       -o exec=on      -o setuid=off   zroot/var/db/pkg
zfs create -o readonly=on           -o exec=off     -o setuid=off   zroot/var/empty
zfs create -o compression=lz4       -o exec=off     -o setuid=off   zroot/var/log
zfs create -o compression=lz4       -o exec=off     -o setuid=off   zroot/var/mail
zfs create                          -o exec=off     -o setuid=off   zroot/var/run
zfs create -o compression=lz4       -o exec=on      -o setuid=off   zroot/var/tmp

#
# We are in /mnt because that's what we set the mount point to...
#
chmod 1777 /mnt/tmp
chmod 1777 /mnt/var/tmp

# add this symlink
cd /mnt ; ln -s usr/home home

# do the install
echo starting the fetch and install
cd /mnt/tmp
export DESTDIR=/mnt
for file in base.txz kernel.txz doc.txz
do
  echo fetching ${file}
  fetch ${FTPURL}/${file}
  echo extratcting ${file}
  cat ${file} | tar --unlink -xpJf - -C ${DESTDIR:-/}
  rm ${file}
done
echo finished with fetch and install

cp /tmp/zpool.cache /mnt/boot/zfs/zpool.cache

# overwrite the /etc/fstab file and direct everything to ZFS
cat << EOF > /mnt/etc/fstab
/dev/mirror/swap none swap sw         0 0
EOF

cat << EOF >> /mnt/boot/loader.conf
geom_mirror_load="YES"
zfs_load="YES"
vfs.root.mountfrom="zfs:zroot/bootenv/default"
EOF

# start sshd
cat << EOF >> /mnt/etc/rc.conf
zfs_enable="YES"

hostname="${HOSTNAME}"
ifconfig_em1="inet ${IP} netmask ${NETMASK}"

defaultrouter="${GATEWAY}"
sshd_enable="YES"
ntpd_enable="YES"
EOF

zpool set bootfs=zroot/bootenv/default zroot

zfs umount -a
zfs set mountpoint=/zroot zroot