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Documentation how to use Btrfs on Alpine Linux. | Documentation how to use Btrfs on Alpine Linux. | ||
== | == Installation == | ||
Installing [https://wikipedia.org/wiki/Btrfs Btrfs] is relatively straight forward. Install the package and tell Alpine to load the module on startup: | Installing [https://wikipedia.org/wiki/Btrfs Btrfs] is relatively straight forward. Install the package and tell Alpine to load the module on startup: | ||
{{Cmd|apk add btrfs-progs | {{Cmd|# apk add {{pkg|btrfs-progs}} | ||
echo btrfs >> /etc/modules}} | <nowiki># echo btrfs >> /etc/modules</nowiki>}} | ||
To load the module | To load the module immediately, you can use the following command: | ||
{{Cmd|modprobe btrfs}} | {{Cmd|# modprobe btrfs}} | ||
If using btrfs as your root filesystem, you should ensure that the initramfs is generated with the btrfs module, otherwise your system may fail to boot. To do so edit (as root) {{path|/etc/mkinitfs/mkinitfs.conf}} and ensure that "btrfs" is in the list of features; then (again as root) run the {{ic|mkinitfs}} command. | |||
== Configuration == | |||
=== Mounting a volume on boot === | |||
To mount a volume on boot, add a new entry to your {{path|/etc/fstab}} file as follows: {{cat|/etc/fstab|<nowiki>... | |||
UUID=abcdef-0055-4958-990f-1413ed1186ec /var/data btrfs defaults,nofail,subvol=@ 0 0</nowiki>}} | |||
If you use more specific mounting options like for example:{{cat|/etc/fstab|<nowiki>... | |||
UUID=005f5994-f51c-4360-8c9b-589fa59ea6fc /mnt/hddext btrfs nofail,rw,noatime,commit=64,nossd,autodefrag,compress=zstd:10 0 2</nowiki>}} | |||
Do not forget to install additional dependencies. If you enabled on the fly compression you need to install zstd: {{cmd|# apk add {{pkg|zstd}}}} | |||
More information about mounting can be found in the official [https://btrfs.readthedocs.io Btrfs wiki] | |||
=== Enable btrfs-scan service === | |||
To ensure that that btrfs partitions are cleanly mounted, enable the {{ic|btrfs-scan}} service from the {{pkg|btrfs-progs}}package: {{Cmd|# rc-update add btrfs-scan boot}} | |||
== Troubleshooting == | == Troubleshooting == | ||
| Line 32: | Line 36: | ||
=== Mount failed === | === Mount failed === | ||
If you try mounting a Btrfs volume via your /etc/fstab and it doesn't show up, it could be because Btrfs does not know about the drives during boot. | If you try mounting a Btrfs volume via your {{path|/etc/fstab}} and it doesn't show up, it could be because Btrfs does not know about the drives during boot. To avoid this issue [[#Enable btrfs-scan service|enable the btrfs-scan service]]. The volume should mount correctly after a reboot. | ||
To | |||
== See also == | |||
* [https://garrit.xyz/posts/2021-12-31-btrfs-on-alpine BTRFS on Alpine Linux] | |||
* [https://web.archive.org/web/20221127043947/https://nparsons.uk/blog/using-btrfs-on-alpine-linux Using BTRFS on Alpine Linux] | |||
* [https://gitlab.alpinelinux.org/alpine/aports/-/issues/9539 Can't mount BTRFS volume using fstab] | |||
* [https://wiki.archlinux.org/title/Btrfs ArchWiki] | |||
* [https://wiki.gentoo.org/wiki/Btrfs Gentoo Wiki] | |||
* [[Install Alpine on a btrfs filesystem with refind as boot manager]] | |||
[[Category:Filesystems]] | |||
Revision as of 06:44, 2 April 2025
Documentation how to use Btrfs on Alpine Linux.
Installation
Installing Btrfs is relatively straight forward. Install the package and tell Alpine to load the module on startup:
# apk add btrfs-progs # echo btrfs >> /etc/modules
To load the module immediately, you can use the following command:
# modprobe btrfs
If using btrfs as your root filesystem, you should ensure that the initramfs is generated with the btrfs module, otherwise your system may fail to boot. To do so edit (as root) /etc/mkinitfs/mkinitfs.conf and ensure that "btrfs" is in the list of features; then (again as root) run the mkinitfs command.
Configuration
Mounting a volume on boot
To mount a volume on boot, add a new entry to your /etc/fstab file as follows:
Contents of /etc/fstab
If you use more specific mounting options like for example:
Contents of /etc/fstab
Do not forget to install additional dependencies. If you enabled on the fly compression you need to install zstd:
# apk add zstd
More information about mounting can be found in the official Btrfs wiki
Enable btrfs-scan service
To ensure that that btrfs partitions are cleanly mounted, enable the btrfs-scan service from the btrfs-progspackage:
# rc-update add btrfs-scan boot
Troubleshooting
Mount failed
If you try mounting a Btrfs volume via your /etc/fstab and it doesn't show up, it could be because Btrfs does not know about the drives during boot. To avoid this issue enable the btrfs-scan service. The volume should mount correctly after a reboot.