125 lines
3.2 KiB
Markdown
125 lines
3.2 KiB
Markdown
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# Provisioning
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After flashing the Alpine Linux extended ISO, partition the disks. For this action internet is required since `zfs` and `sgdisk` are not included on the extended ISO, therefore it needs to be obtained from the repository.
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To set it up `setup-interfaces` and `setup-apkrepos` will be used.
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```
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# setup-interfaces -ar
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# setup-apkrepos -c1
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```
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A few packages will have to be installed first:
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```
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# apk add zfs lsblk sgdisk wipefs dosfstools acpid mdadm
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```
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and load the ZFS kernel module
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```
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# modprobe zfs
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```
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Define the disks you want to use for this install
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```
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# export disks="/dev/disk/by-id/<id-disk-1> ... /dev/disk/by-id/<id-disk-n>"
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```
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with `<id-disk-n>` for $n \in \mathbb{N}$ the `id` of the disk.
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> According to [openzfs-FAQ](https://openzfs.github.io/openzfs-docs/Project%20and%20Community/FAQ.html) using `/dev/disk/by-id/` is the best practice for small pools. For larger pools, using serial Attached SCSI (SAS) and the like, see [vdev_id](https://openzfs.github.io/openzfs-docs/man/master/5/vdev_id.conf.5.html) for proper configuration.
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Wipe the existing disk partitions
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```
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# for disk in $disks; do
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> zpool labelclear -f $disk
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> wipefs -a $disk
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> sgdisk --zap-all $disk
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> done
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```
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Create on each disk an `EFI system` partition (ESP) and a `Linux filesystem` partition
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```
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# for disk in $disks; do
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> sgdisk -n 1:1m:+512m -t 1:ef00 $disk
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> sgdisk -n 2:0:-10m -t 2:8300 $disk
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> done
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```
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Create device nodes
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```
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# mdev -s
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```
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Define the EFI partitions
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```
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# export efiparts=""
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# for disk in $disks; do
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> efipart=${disk}-part-1
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> efiparts="$efiparts $efipart"
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> done
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```
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Create a `mdraid` array on the EFI partitions
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```
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# modprobe raid1
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# mdadm --create --level 1 --metadata 1.0 --raid-devices <n> /dev/md/esp $efiparts
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# mdadm --assemble --scan
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```
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Format the array with a FAT32 filesystem
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```
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# mkfs.fat -F 32 /dev/md/esp
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```
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## ZFS pool creation
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Define the pool partitions
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```
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# export poolparts=""
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# for disk in $disks; do
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> poolpart=${disk}-part-2
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> poolparts="$poolparts $poolpart"
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> done
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```
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Create the system pool
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```
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# zpool create -f \
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-o ashift=12 \
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-O compression=lz4 \
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-O acltype=posix \
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-O xattr=sa \
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-O dnodesize=auto \
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-m none \
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tank raidz1 $poolparts
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```
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> Additionally, the `spare` option can be used to indicate spare disks. If more redundancy is preferred than `raidz2` and `raidz3` are possible [alternatives](https://openzfs.github.io/openzfs-docs/man/master/7/zpoolconcepts.7.html) for `raidz1`. If a single disk is used the `raidz` option can be left aside. For further information see [zpool-create](https://openzfs.github.io/openzfs-docs/man/master/8/zpool-create.8.html).
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Then create the system datasets
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```
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# zfs create -o mountpoint=none tank/root
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# zfs create -o canmount=noauto -o mountpoint=/ -o atime=off -o quota=24g tank/root/alpine
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# zfs create -o mountpoint=/home -o atime=off -o setuid=off -o devices=off -o quota=<home-quota> -o encryption=on -o keyformat=passphrase tank/home
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# zfs create -o mountpoint=/var -o exec=off -o setuid=off -o devices=off -o quota=16g tank/var
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```
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> Setting the `<home-quota>` depends on the total size of the pool, generally try to reserve some empty space in the pool.
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Finally, export the zpool
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```
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# zpool export tank
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```
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