- Lab
- A Cloud Guru
Creating Btrfs Subvolumes and Snapshots
The `b-tree` file system, `btrfs`, is a Linux filesystem that implements several advanced features such as volume management, snapshots, and copy-on-write. In this hands-on lab, you will be tasked with creating and interacting with a `btrfs` file system.
Path Info
Table of Contents
-
Challenge
Create a btrfs filesystem based on the information provided in the instructions.
- Create a
btrfs
filesystem using/dev/xvdf1, /dev/xvdg1
, and/dev/xvdj1
:
mkfs -t btrfs /dev/xvdf1 /dev/xvdg1 /dev/xvdj1
- Mount the
btrfs
filesystem on/mnt/data
:
mount -t btrfs /dev/xvdg1 /mnt/data
- Use a text editor (i.e.,
vim
) to open/etc/fstab
and add the following entry:
UUID=filesystem_UUID /mnt/data btrfs defaults 0 0
- Create a
-
Challenge
Create two subvolumes for /mnt/data based on the information provided in the instructions.
- Create the
user
andadmin
subvolumes in the/mnt/data
filesystem:
btrfs subvolume create /mnt/data/user btrfs subvolume create /mnt/data/admin
- Mount the
admin
subvolume at/mnt/admin
and theuser
subvolume at/mnt/user
:
mount -t btrfs -o subvol=user /dev/xvdg1 /mnt/user mount -t btrfs -o subvol=admin /dev/xvdg1 /mnt/admin
- Use a text editor (i.e.,
vim
) to open/etc/fstab
and add entries for/mnt/user and /mnt/admin
:
UUID=filesystem_UUID /mnt/user btrfs subvol=user,defaults 0 0 UUID=filesystem_UUID /mnt/admin btrfs subvol=admin,defaults 0 0
- Create the
-
Challenge
Add the /dev/xvdj2 device to the filesystem mounted on /mnt/backup
- Add
/dev/xvdj2
to filesystem mounted on/mnt/backup
using thebtrfs
command:
btrfs device add /dev/xvdj2 /mnt/backup
- Balance the filesystem to spread block groups across all devices:
btrfs balance start --full-balance /mnt/backup
- Add
-
Challenge
Create two snapshots of /mnt/backup/user_data based on the information provided in the instructions.
- Create a snapshot called
user_data_snap”
from theuser_data
volume:
btrfs subvolume snapshot /mnt/backup/user_data/ /mnt/backup/user_data_snap
- Create a read-only snapshot called
user_data_snap_ro
from theuser_data
volume:
btrfs subvolume snapshot -r /mnt/backup/user_data/ /mnt/backup/user_data_snap_ro
- Create a snapshot called
What's a lab?
Hands-on Labs are real environments created by industry experts to help you learn. These environments help you gain knowledge and experience, practice without compromising your system, test without risk, destroy without fear, and let you learn from your mistakes. Hands-on Labs: practice your skills before delivering in the real world.
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Guided walkthrough
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Did you know?
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