117 lines
3.1 KiB
Markdown
117 lines
3.1 KiB
Markdown
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Current steps for my NixOS-on-ZFS installs with impermanence.
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## Target layout (example from tverskoy):
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Partitioning:
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```
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nvme0n1 259:0 0 238.5G 0 disk
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├─nvme0n1p1 259:1 0 128M 0 part /boot (type: EFI system)
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└─nvme0n1p2 259:2 0 238.3G 0 part (type: Solaris root)
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```
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ZFS layout:
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```
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NAME USED AVAIL REFER MOUNTPOINT
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zpool 212G 19.0G 248K /zpool
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zpool/ephemeral 668M 19.0G 192K /zpool/ephemeral
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zpool/ephemeral/home 667M 19.0G 667M legacy
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zpool/local 71.3G 19.0G 192K /zpool/local
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zpool/local/nix 71.3G 19.0G 71.3G legacy
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zpool/safe 140G 19.0G 192K /zpool/safe
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zpool/safe/depot 414M 19.0G 414M legacy
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zpool/safe/persist 139G 19.0G 139G legacy
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```
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With reset-snapshots:
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```
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NAME USED AVAIL REFER MOUNTPOINT
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zpool/ephemeral/home@blank 144K - 192K -
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zpool/ephemeral/home@tazjin-clean 144K - 200K -
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```
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Legacy mountpoints are used because the NixOS wiki advises that using
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ZFS own mountpoints might lead to issues with the mount order during
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boot.
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## Install steps
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1. First, get internet.
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2. Use `fdisk` to set up the partition layout above (fwiw, EFI type
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should be `1`, Solaris root should be `66`).
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3. Format the first partition for EFI: `mkfs.fat -F32 -n EFI $part1`
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4. Init ZFS stuff:
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```
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zpool create \
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# 2 SSD only settings
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-o ashift=12 \
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-o autotrim=on \
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-R /mnt \
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-O canmount=off \
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-O mountpoint=none \
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-O acltype=posixacl \
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-O compression=lz4 \
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-O atime=off \
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-O xattr=sa \
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-O encryption=aes-256-gcm \
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-O keylocation=prompt \
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-O keyformat=passphrase \
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zpool $part2
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```
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Reserve some space for deletions:
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```
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zfs create -o refreservation=1G -o mountpoint=none zpool/reserved
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```
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Create the datasets as per the target layout:
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```
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# Throwaway datasets
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zfs create -o canmount=off -o mountpoint=none zpool/ephemeral
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zfs create -o mountpoint=legacy zpool/ephemeral/root
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zfs create -o mountpoint=legacy zpool/ephemeral/home
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# Persistent datasets
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zfs create -o canmount=off -o mountpoint=none zpool/persistent
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zfs create -o mountpoint=legacy zpool/persistent/nix
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zfs create -o mountpoint=legacy zpool/persistent/depot
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zfs create -o mountpoint=legacy zpool/persistent/data
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```
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Create completely blank snapshots of the ephemeral datasets:
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```
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zfs snapshot zpool/ephemeral/root@blank
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zfs snapshot zpool/ephemeral/home@blank
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```
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The ephemeral home volume needs the user folder already set up with
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permissions. Mount it and create the folder there:
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```
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mount -t zfs zpool/ephemeral/root /mnt
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mkdir /mnt/home
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mount -t zfs zpool/ephemeral/home /mnt/home
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mkdir /mnt/home/tazjin
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chmod 1000:100 /mnt/home/tazjin
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zfs snapshot zpool/ephemeral/home@tazjin-clean
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```
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Now the persistent Nix store volume can be mounted and installation
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can begin.
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```
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mkdir /mnt/nix
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mount -t zfs zpool/persistent/nix /mnt/nix
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```
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4. Configure & install NixOS as usual.
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