ZFS Install Guide
This wiki will show you how to install Funtoo on ZFS (rootfs).
ZFS designed for 64-bit systems. We only recommending and supporting 64-bit platforms and installations!
ZFS recommendation is to control entire disk, hence, guide reflecting only installing ZFS on whole disk and legacy boot. Installing on UEFI requires separate partition for /boot, formatted into FAT32 and not covered here, though, installation on UEFI is certainly possible. Guide also not describing anything related to encryption.
Downloading the ISO (With ZFS)
In order to install Funtoo on ZFS, you will need an environment such as live media with ZFS tools provided.
Creating a bootable USB from ISO (From a Linux Environment)
After you download the iso, you can do the following steps to create a bootable USB: TBA.
Booting the ISO
Creating ZFS partitions
We are letting ZFS automatically partition the drive. We use "partition" term, so it would be more familiar for many.
Creating of pool
# mkdir /mnt/funtoo # zpool create -f -o ashift=12 -o cachefile=/tmp/zpool.cache -O normalization=formD -m none -R /mnt/funtoo -d -o feature@async_destroy=enabled -o feature@empty_bpobj=enabled -o feature@lz4_compress=enabled -o feature@spacemap_histogram=enabled -o feature@enabled_txg=enabled -o feature@extensible_dataset=enabled -o feature@bookmarks=enabled rpool /dev/sda
ashift 12 stands for 4-K block size sectors. Such type of hard drives are common nowadays.
Pool name is irrelevant,
rpool used in this guide.
Create the zfs datasets
# zfs create -o mountpoint=none rpool/ROOT # zfs create -o mountpoint=/ rpool/ROOT/funtoo
Create optional datasets
Described below datasets are examples and optional. It's up to users to perform creation of their own datasets.
# zfs create -o mountpoint=/home rpool/HOME # zfs create -o mountpoint=/root rpool/HOME/root
# zfs create -o mountpoint=none -o setuid=off rpool/FUNTOO # zfs create -o mountpoint=/usr/portage -o atime=off rpool/FUNTOO/portage # zfs create -o mountpoint=/usr/portage/distfiles rpool/FUNTOO/distfiles
# zfs create -o mountpoint=/var/tmp/portage -o compression=lz4 -o sync=disabled rpool/FUNTOO/build
When booting from ZFS, you must specify a boot device and a root file system within the pool that was identified by the boot device. By default, the dataset selected for booting is the one identified by the pool's
# zpool set bootfs=rpool/ROOT/funtoo rpool
Now that initial ZFS pool created, datasets ready, we can perform stage3 unpack and basic system installation. This part does not differ much from regular Funtoo Linux installation. http://www.funtoo.org/Install#Installing_the_Stage_3_tarball. We recommend using
funtoo-current stages for ZFS.
# cd /mnt/funtoo # wget http://build.funtoo.org/funtoo-current/x86-64bit/generic_64/stage3-latest.tar.xzExtract the contents with the following command, substituting in the actual name of your stage 3 tarball (in case of arch optimized stage).
# tar xpf stage3-latest.tar.xzNow we need to create chroot environment by following:
# cd /mnt/funtoo # mount -t proc none proc # mount --rbind /sys sys # mount --rbind /dev devImportant step is to copy ZFS cache we created at the very beginning of our
rpoolcreation into chroot.
# mkdir -p /mnt/funtoo/etc/zfs # cp /tmp/zpool.cache /mnt/funtoo/etc/zfs/zpool.cacheYou'll also want to copy over
resolv.confin order to have proper resolution of Internet hostnames from inside the chroot:
# cp /etc/resolv.conf /mnt/funtoo/etc/
We are ready to
# chroot /mnt/funtoo /bin/bash # export PS1="(chroot) $PS1"; cd
Installing ZFS userspace and bootloader
Installing the ZFS userspace tools and kernel modules
In order to install ZFS packages we need to get portage tree first:
# emerge --sync # emerge sys-fs/zfs
Installing GRUB 2
# echo "sys-boot/grub libzfs" >> /etc/portage/package.use # emerge grub
Initial kernel build
Funtoo stage3 have precompiled kernel but initramfs needs rebuilding to include ZFS binaries. This possible with
# genkernel initramfs --no-clean --no-mountboot --zfs
Configuring the Bootloader
sys-boot/grub require small partition, called Bios boot partition. Remember, that we let ZFS partition whole drive. By design, during this, a very small unpartitioned space left at the beginning of the disk. We will use
sgdisk, which is part of
sys-apps/gptfdisk to format free space into BIOS partition.
# sgdisk --new=2:48:2047 --typecode=2:EF02 --change-name=2:"BIOS boot partition" /dev/sda
Installing GRUB2 to disk is as easy as:
# grub-install /dev/sdaNow it's time for us to create grub's configuration file:
# grub-mkconfig -O /boot/grub/grub.cfg