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ZFS changed
Initial version. Tested with R2-Beta2 (3.7.6) and R2-Beta3 (3.11).
This commit is contained in:
Hakisho Nukama
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ZFS.md
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ZFS.md
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---
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layout: wiki
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title: ZFS
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permalink: /wiki/ZFS/
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---
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ZFS in Qubes
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============
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**Use at your own risk**!
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Beware: Dragons might eat your precious data!
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Install ZFS in Dom0
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===================
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Install DKMS style packages for Fedora <sup>(defunct\\ in\\ 0.6.2\\ due\\ to\\ spl/issues/284)</sup>
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----------------------------------------------------------------------------------------------------
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Fetch and install repository for DKMS style packages for your Dom0 Fedora version [http://zfsonlinux.org/fedora.html](http://zfsonlinux.org/fedora.html):
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``` {.wiki}
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disp1# wget http://archive.zfsonlinux.org/fedora/zfs-release-1-1$(rpm -E %dist).noarch.rpm
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dom0# qvm-run --pass-io disp1 'cat /home/user/zfs-release-1-1.fc18.noarch.rpm' > /home/user/zfs-release-1-1.fc18.noarch.rpm
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dom0# sudo yum localinstall /home/user/zfs-release-1-1.fc18.noarch.rpm
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dom0# sudo sed -i 's/$releasever/18/g' /etc/yum.repo.d/zfs.repo
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dom0# sudo qubes-dom0-update @development-tools
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dom0# sudo qubes-dom0-update zfs
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```
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Install DKMS style packages from git-repository
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-----------------------------------------------
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Build and install your DKMS or KMOD packages as described in [http://zfsonlinux.org/generic-rpm.html](http://zfsonlinux.org/generic-rpm.html).
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### Prerequisites steps in AppVM <sup>(i.e.\\ disp1)</sup>
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Checkout repositories for SPL and ZFS:
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``` {.wiki}
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mkdir ~/repositories && cd ~/repositories
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git clone https://github.com/zfsonlinux/spl.git
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git clone https://github.com/zfsonlinux/zfs.git
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```
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Revert changes in SPL repository due to this bug: [https://github.com/zfsonlinux/spl/issues/284](https://github.com/zfsonlinux/spl/issues/284)
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``` {.wiki}
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cd ~/repositories/spl
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git config --global user.email "user@example.com"
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git config --global user.name "user"
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git revert e3c4d44886a8564e84aa697477b0e37211d634cd
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```
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### Installation steps in Dom0
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Copy repositories over to Dom0:
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``` {.wiki}
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mkdir ~/repositories
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qvm-run --pass-io disp1 'tar -cf - -C ~/repositories/ {spl,zfs}' | tar -xpf - -C ~/repositories/
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```
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Installing build requirements for SPL and ZFS DKMS modules:
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``` {.wiki}
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sudo qubes-dom0-update dkms kernel-devel zlib-devel libuuid-devel libblkid-devel lsscsi bc autoconf automake binutils bison flex gcc gcc-c++ gdb gettext libtool make pkgconfig redhat-rpm-config rpm-build strace
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```
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Configure and build SPL DKMS packages:
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``` {.wiki}
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cd ~/repositories/spl
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./autogen.sh
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./configure --with-config=user
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make rpm-utils rpm-dkms
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```
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Configure and build ZFS DKMS packages:
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``` {.wiki}
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cd ~/repositories/zfs
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./autogen.sh
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./configure --with-config=user
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make rpm-utils rpm-dkms
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```
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Install SPL and ZFS packages (i.e. version 0.6.2):
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``` {.wiki}
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sudo yum localinstall \
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~/repositories/spl/spl-0.6.2-1.qbs2.x86_64.rpm \
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~/repositories/spl/spl-dkms-0.6.2-1.qbs2.noarch.rpm \
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~/repositories/zfs/zfs-0.6.2-1.qbs2.x86_64.rpm \
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~/repositories/zfs/zfs-dkms-0.6.2-1.qbs2.noarch.rpm \
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~/repositories/zfs/zfs-dracut-0.6.2-1.qbs2.x86_64.rpm \
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~/repositories/zfs/zfs-test-0.6.2-1.qbs2.x86_64.rpm
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```
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Configure ZFS
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=============
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Automatically load modules
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--------------------------
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/etc/sysconfig/modules/zfs.modules
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``` {.wiki}
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#!/bin/sh
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for module in spl zfs; do
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modprobe ${module} >/dev/null 2>&1
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done
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```
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Make this file executable.
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Tuning
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------
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Tame the memory-eating dragon (i.e. 512 Mb zfs\_arc\_max):
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/etc/modprobe.d/zfs.conf
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``` {.wiki}
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options zfs zfs_arc_max=536870912
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```
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Setup a zpool with ZFS datasets
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-------------------------------
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You can create a ZFS dataset for each AppVM, ServiceVM, HVM or TemplateVM or just use a pool as your backup location.
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Move your existing directory to a temporary location, or the ZFS mount will overlay your directory.
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Beware: VMs on a ZFS dataset aren't working, if your ZFS installation deserts you.
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So keep netvm, firewallvm and your templates on your root file-system (preferably on a SSD).
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``` {.wiki}
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zpool create -m none -o ashift=12 -O atime=off -O compression=lz4 qubes mirror /dev/mapper/<cryptname1> /dev/mapper/<cryptname2>
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zfs create -p qubes/appvms
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zfs create -m /var/lib/qubes/backup-zfs qubes/backup
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zfs create -m /var/lib/qubes/appvms/banking qubes/appvms/banking
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zfs create -m /var/lib/qubes/appvms/personal qubes/appvms/personal
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zfs create -m /var/lib/qubes/appvms/untrusted qubes/appvms/untrusted
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zfs create -m /var/lib/qubes/appvms/work qubes/appvms/work
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```
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Have fun with zpool and zfs.
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Tips and Hints
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==============
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Backup your data
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----------------
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You're depending on an huge amount of code for this file system, keep this in mind and backup your precious data.
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Encrypt underlying devices
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--------------------------
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``` {.wiki}
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dom0# cryptsetup -c aes-xts-plain64 luksFormat <device1>
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dom0# cryptsetup luksOpen <device1> <cryptname1>
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```
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With the use of cryptsetup a keyfile can be specified to decrypt devices.
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``` {.wiki}
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dom0# head -c 256 /dev/random > /root/keyfile1
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dom0# chmod 0400 /root/keyfile1
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dom0# cryptsetup luksAddKey <device1> /root/keyfile1
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```
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Decrypt devices on boot
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-----------------------
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Add your devices to /etc/crypttab.
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``` {.wiki}
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<cryptname1> <device1> none|<keyfile1>
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```
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Specifying a keyfile is especially useful, if ZFS should be ready during boot.
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Further Reading
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---------------
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- [http://www.open-zfs.org](http://www.open-zfs.org)
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- [http://zfsonlinux.org](http://zfsonlinux.org)
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