Created
October 23, 2018 16:28
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Set up Alpine Linux RAID1 over 4 disks with 16GB rootfs size
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| # set up basic alpine environment (networking, kbd layout, apk repo) | |
| setup-alpine -q | |
| # add some required packages | |
| apk add e2fsprogs mdadm parted sgdisk gptfdisk | |
| # create partition layout on the first disk | |
| gdisk /dev/sda | |
| > o | |
| > y | |
| > n | |
| > | |
| > | |
| > +128M | |
| > fd00 | |
| > n | |
| > | |
| > | |
| > +16G | |
| > fd00 | |
| > w | |
| > y | |
| # copy the partition layout to all other disks | |
| sgdisk /dev/sda -R /dev/sdb | |
| sgdisk /dev/sda -R /dev/sdc | |
| sgdisk /dev/sda -R /dev/sgd | |
| # randomize the UUIDs on all the disks | |
| sgdisk -G /dev/sdb | |
| sgdisk -G /dev/sdc | |
| sgdisk -G /dev/sdd | |
| # set the bootable flag on the first partition of all disks | |
| # Note: I'm not sure if this is being copied by the sgdisk -R command above, | |
| # so to be 100% sure, we set it manually on all disks | |
| sgdisk /dev/sda --attributes=1:set:2 | |
| sgdisk /dev/sdb --attributes=1:set:2 | |
| sgdisk /dev/sdc --attributes=1:set:2 | |
| sgdisk /dev/sdd --attributes=1:set:2 | |
| # create our /boot raid1 | |
| # Note: --metadata 1.0 is VERY important here, syslinux does not support anything newer! | |
| mdadm --create /dev/md0 --metadata 1.0 -l 1 -n 4 /dev/sda1 /dev/sdb1 /dev/sdc1 /dev/sdd1 | |
| # create our / raid1 | |
| mdadm --create /dev/md1 -l 1 -n 4 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2 | |
| # create ext4 partitions | |
| mkfs.ext4 -m 0 /dev/md0 | |
| mkfs.ext4 /dev/md1 | |
| # mount the partitions | |
| mount -t ext4 /dev/md1 /mnt | |
| mkdir /mnt/boot /mnt/etc | |
| mount -t ext4 /dev/md0 /mnt/boot | |
| # write the mdadm config so we don't end up with md127/md126 instead of md0/md1 | |
| mdadm --detail --scan > /mnt/etc/mdadm.conf | |
| # make sure we include the raid1 module in our initrd | |
| echo raid1 >> /etc/modules | |
| # do the actual alpine linux installation | |
| setup-disk -m sys /mnt | |
| # cleanly unmount everything | |
| umount /mnt/boot /mnt | |
| # write the GPT/MBR bootloader to the disk protective mbr | |
| dd bs=440 conv=notrunc count=1 if=/usr/share/syslinux/gptmbr.bin of=/dev/sda | |
| dd bs=440 conv=notrunc count=1 if=/usr/share/syslinux/gptmbr.bin of=/dev/sdb | |
| dd bs=440 conv=notrunc count=1 if=/usr/share/syslinux/gptmbr.bin of=/dev/sdc | |
| dd bs=440 conv=notrunc count=1 if=/usr/share/syslinux/gptmbr.bin of=/dev/sdd | |
| # make sure all disks are synced before rebooting/shutting down | |
| sync |
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Doesn't appear to work anymore (alpine 3.18) - Fails at line 44
The partitions created in line 7 dont show in /dev/sd*, but do show in /dev/block and lsblk