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chore: maintenance of btrfs in kb articles

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This commit is contained in:
Michele Cereda
2023-09-26 08:41:01 +02:00
parent 6769aa4212
commit 2132f4c2c2
2 changed files with 25 additions and 2 deletions
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26
knowledge base/btrfs.md
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@@ -28,6 +28,7 @@ sudo mkfs.btrfs --label "data" /dev/sd{a,c,d,f,g} --force \
sudo btrfs filesystem show
# Show detailed `df` analogue for filesystems.
# Also show the filesystem specifications, like metadata replication.
sudo btrfs filesystem df "path/to/filesystem"
sudo btrfs filesystem df -h "path/to/filesystem"
@@ -60,10 +61,18 @@ sudo btrfs subvolume create "path/to/subvolume"
btrfs subvolume snapshot "${HOME}/path/to/subvolume" "${HOME}/path/to/snapshot"
sudo btrfs subvolume snapshot -r "path/to/subvolume" "path/to/snapshot"
# Mount subvolumes without mounting their main filesystem.
# Display the ID of the default subvolume.
# The default subvolume is the one mounted when no other is specified.
btrfs subvolume get-default "path/to/subvolume"
# Set the default subvolume for a filesystem.
btrfs subvolume set-default "subvolume_id" "path/to/root/subvolume"
# Mount specific subvolumes without mounting the default one.
sudo mount -o 'subvol=sv1' "/dev/sdb" "/mnt"
# Delete subvolumes.
sudo btrfs subvolume delete -C "path/to/subvolume/1" "path/to/subvolume/n"
sudo btrfs subvolume delete --commit-each "path/to/subvolume"
# Automatically compress new files and folders in directories in BTRFS mounts.
@@ -87,8 +96,12 @@ btrfs … -ti "path/to/inode"
btrfs … -td "path/to/device"
btrfs … "path/to/autoselected/type/of/resource"
# Change RW subvolumes to RO ones on the fly.
# Change RW subvolumes to RO ones on the fly and viceversa.
btrfs property set -ts "path/to/subvolume" 'ro' 'true'
btrfs property set "path/to/subvolume" 'ro' 'false'
# Enable compression on subvolumes.
btrfs property set "path/to/subvolume" 'compression' 'zstd'
# Show subvolumes' information.
sudo btrfs subvolume show "path/to/subvolume"
@@ -151,6 +164,13 @@ swapon 'path/to/swapfile'
# `btrfs` utility >= 6.1 only.
btrfs filesystem mkswapfile --size '2G' 'path/to/swapfile'
swapon 'path/to/swapfile'
# Create multiple snapshots at once.
DATETIME="$(date '+%F_%H-%M-%S')"
parallel -qt \
btrfs subvolume snapshot -r \
"${BTRFS_ROOT}/{}" "${BTRFS_ROOT}/.snapshots/${DATETIME}/{}" \
::: $(ls "${BTRFS_ROOT}")
```
## Check differences between 2 snapshots
@@ -171,6 +191,7 @@ sudo snapper -c 'config' diff '445..446'
- [Swapfile]
- [Gentoo wiki]
- [Snapper]
- [Managing the Btrfs File System]
## Sources
@@ -187,6 +208,7 @@ All the references in the [further readings] section, plus the following:
<!-- Upstream -->
[documentation]: https://btrfs.readthedocs.io/en/latest/
[introduction]: https://btrfs.readthedocs.io/en/latest/Introduction.html
[managing the btrfs file system]: https://docs.oracle.com/en/operating-systems/oracle-linux/9/fsadmin/fsadmin-ManagingtheBtrfsFileSystem.html#btrfs-main
[mkfs.btrfs]: https://btrfs.readthedocs.io/en/latest/mkfs.btrfs.html
[swapfile]: https://btrfs.readthedocs.io/en/latest/Swapfile.html