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Configuring Btrfs in SUSE Linux Enterprise

In this hands-on lab, we will be working with the Btrfs filesystem. This will cover subvolumes as well as snapshots, including restoring from a snapshot.

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Path Info

Level
Clock icon Beginner
Duration
Clock icon 30m
Published
Clock icon Jan 10, 2020

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Table of Contents

  1. Challenge

    Create a Btrfs Filesystem on One of the Empty Disks, Mount it at `/btrfs`, Create a Data Directory, and Copy `/etc/ssh` into This Directory

    1. Locate the empty disk (it will be the one with no partitions listed):

      lsblk

    2. Create the btrfs filesystem on the empty disk from Step 1:

      sudo mkfs.btrfs /dev/nvme0n1

    3. Create the btrfs directory:

      sudo mkdir /btrfs

    4. Mount the disk:

      sudo mount /dev/nvme0n1 /btrfs

    5. Change to the new /btrfs directory:

      cd /btrfs

    6. Create the "normal" directory:

      sudo mkdir data

    7. Copy the ssh directory to the data directory:

      sudo cp -r /etc/ssh ./data

  2. Challenge

    Convert the `data` Directory from Normal to Btrfs Subvol, Get Rid of the Original, and Verify with `subvolume list`

    1. From the /btrfs directory, create the subvolume:

      sudo btrfs subvolume create ./data1

    2. Copy over the files from /data to /data1 (notice the . after data/):

      sudo cp -r data/. ./data1

    3. Remove the original directory:

      sudo rm -rf data

    4. Rename the subvolume:

      sudo mv ./data1/ ./data

    5. Verify the subvolume:

      sudo btrfs subvolume list .

  3. Challenge

    Create a Btrfs Snapshot of the `data` Directory Named `data-snap`, touch a regular `file` in `data`, Compare the Snapshot and the Original, Delete `data/ssh/ssh_config`, Verify It Still Exists in the Snapshot, and Restore the Snapshot as Original Director

    1. From the /btrfs directory, create a snapshot of data:

      sudo btrfs subvolume snapshot ./data ./data-snap

    2. Touch a file named file in data, and compare ./data to ./data-snap:

      sudo touch data/file 
ls data
ls data-snap

    3. Remove data/ssh/ssh_config, and compare to see it still exists in data-snap:

      sudo rm data/ssh/ssh_config
ls data/ssh/ssh_config

      The file should not be found.

    4. Now verify it's in the snapshot:

      ls data-snap/ssh/ssh_config

    5. Delete data and then restore it from data-snap:

      sudo btrfs subvolume delete data

sudo btrfs subvolume snapshot ./data-snap ./data

    6. Verify with subvolume list:

      sudo btrfs subvolume list .

    7. Finally, verify the file you had deleted is back:

      ls data/ssh/ssh_config
A Cloud Guru - Labs - Configuring Btrfs in SUSE Linux Enterprise
Author
A Cloud Guru

The Cloud Content team comprises subject matter experts hyper focused on services offered by the leading cloud vendors (AWS, GCP, and Azure), as well as cloud-related technologies such as Linux and DevOps. The team is thrilled to share their knowledge to help you build modern tech solutions from the ground up, secure and optimize your environments, and so much more!

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