150 lines
4.2 KiB
ReStructuredText
150 lines
4.2 KiB
ReStructuredText
.. highlight:: sh
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Preparation
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======================
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.. contents:: Table of Contents
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:local:
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#. Disable Secure Boot. ZFS modules can not be loaded if Secure Boot is enabled.
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#. Download a variant of `Rocky Linux 8.5 Live
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ISO <https://dl.rockylinux.org/pub/rocky/8.5/Live/x86_64/>`__ and boot from it.
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#. Set root password or ``/root/.ssh/authorized_keys``.
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#. Start SSH server::
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echo PermitRootLogin yes >> /etc/ssh/sshd_config
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systemctl restart sshd
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#. Connect from another computer::
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ssh root@192.168.1.19
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#. Temporarily set SELinux to permissive in live environment::
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setenforce 0
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SELinux will be enabled on the installed system.
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#. Optional: If mirror speed is slow, you can manually pick a fixed mirror
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from `mirrorlist <https://mirrors.rockylinux.org/mirrormanager/mirrors>`__
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and apply it::
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sed -i 's|^mirrorlist=|#mirrorlist=|g' /etc/yum.repos.d/*
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sed -i 's|^#baseurl=|baseurl=|g' /etc/yum.repos.d/*
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sed -i 's|dl.rockylinux.org/$contentdir|mirrors.sjtug.sjtu.edu.cn/rocky|g' /etc/yum.repos.d/*
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#. Add ZFS repo::
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source /etc/os-release
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RHEL_ZFS_REPO=https://zfsonlinux.org/epel/zfs-release.el${VERSION_ID/./_}.noarch.rpm
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dnf install -y $RHEL_ZFS_REPO
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#. Install ZFS packages::
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dnf install -y epel-release
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dnf config-manager --disable zfs
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dnf config-manager --enable zfs-kmod
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dnf install -y zfs
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#. Load kernel modules::
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modprobe zfs
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#. Install helper script and partition tool::
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rpm -ivh --nodeps https://dl.fedoraproject.org/pub/fedora/linux/releases/36/Everything/x86_64/os/Packages/a/arch-install-scripts-24-3.fc36.noarch.rpm
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dnf install -y gdisk dosfstools
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#. Set RHEL major version::
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INST_RHEL_VER=${VERSION_ID%%.*}
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#. Unique pool suffix. ZFS expects pool names to be
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unique, therefore it's recommended to create
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pools with a unique suffix::
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INST_UUID=$(dd if=/dev/urandom bs=1 count=100 2>/dev/null | tr -dc 'a-z0-9' | cut -c-6)
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#. Identify this installation in ZFS filesystem path::
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INST_ID=rhel
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#. Target disk
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List available disks with::
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ls /dev/disk/by-id/*
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If using virtio as disk bus, use
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``/dev/disk/by-path/*``.
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Declare disk array::
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DISK='/dev/disk/by-id/ata-FOO /dev/disk/by-id/nvme-BAR'
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For single disk installation, use::
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DISK='/dev/disk/by-id/disk1'
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#. Choose a primary disk. This disk will be used
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for primary EFI partition, default to
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first disk in the array::
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INST_PRIMARY_DISK=$(echo $DISK | cut -f1 -d\ )
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#. Set vdev topology, possible values are:
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- (not set, single disk or striped; no redundancy)
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- mirror
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- raidz1
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- raidz2
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- raidz3
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::
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INST_VDEV=
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This will create a single vdev with the topology of your choice.
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It is also possible to manually create a pool with multiple vdevs, such as::
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zpool create --options \
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poolName \
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mirror sda sdb \
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raidz2 sdc ... \
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raidz3 sde ... \
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spare sdf ...
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Notice the cost of parity when using RAID-Z. See
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`here <https://www.delphix.com/blog/delphix-engineering/zfs-raidz-stripe-width-or-how-i-learned-stop-worrying-and-love-raidz>`__
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and `here <https://docs.google.com/spreadsheets/d/1tf4qx1aMJp8Lo_R6gpT689wTjHv6CGVElrPqTA0w_ZY/>`__.
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For boot pool, which must be readable by GRUB, mirrored vdev should always be used for maximum redundancy.
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This guide will use mirrored bpool for multi-disk setup.
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Refer to `zpoolconcepts <https://openzfs.github.io/openzfs-docs/man/7/zpoolconcepts.7.html>`__
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and `zpool-create <https://openzfs.github.io/openzfs-docs/man/8/zpool-create.8.html>`__
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man pages for details.
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#. Set partition size:
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Set ESP size::
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INST_PARTSIZE_ESP=2 # in GB
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Set boot pool size. To avoid running out of space while using
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boot environments, the minimum is 4GB. Adjust the size if you
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intend to use multiple kernel/distros::
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INST_PARTSIZE_BPOOL=4
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Set swap size. It's `recommended <https://chrisdown.name/2018/01/02/in-defence-of-swap.html>`__
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to setup a swap partition. If you intend to use hibernation,
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the minimum should be no less than RAM size. Skip if swap is not needed::
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INST_PARTSIZE_SWAP=8
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Root pool size, use all remaining disk space if not set::
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INST_PARTSIZE_RPOOL=
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