How did passengers keep warm on sail ships?

Currents/voltages graph for an electrical circuit

ODD NUMBER in Cognitive Linguistics of WILLIAM CROFT and D. ALAN CRUSE

How to support a colleague who finds meetings extremely tiring?

Is it safe to harvest rainwater that fell on solar panels?

How to translate "being like"?

What is this sharp, curved notch on my knife for?

Did any laptop computers have a built-in 5 1/4 inch floppy drive?

Loose spokes after only a few rides

Is it ethical to upload a automatically generated paper to a non peer-reviewed site as part of a larger research?

"as much details as you can remember"

Is bread bad for ducks?

Can there be female White Walkers?

Deal with toxic manager when you can't quit

What do these terms in Caesar's Gallic wars mean?

Why can't devices on different VLANs, but on the same subnet, communicate?

If I can cast sorceries at instant speed, can I use sorcery-speed activated abilities at instant speed?

Correct punctuation for showing a character's confusion

writing variables above the numbers in tikz picture

Is an up-to-date browser secure on an out-of-date OS?

If a sorcerer casts the Banishment spell on a PC while in Avernus, does the PC return to their home plane?

Did Scotland spend $250,000 for the slogan "Welcome to Scotland"?

Cooking pasta in a water boiler

How come people say “Would of”?

BTRFS - Subvolumes for / & /home, and being able to snapshot and restore from the snapshots?

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty{ margin-bottom:0;
}

1

OS: Arch Linux x86_64

I have one BTRFS filesystem, both containing / & /home, how do I create subvolumes for both / & /home, and create a snapshot for each and restore from their snapshots (restore snapshots from a live CD)?

arch-linux btrfs

share|improve this question

asked 13 hours ago

ZethexZethex

83

add a comment | 

1

OS: Arch Linux x86_64

I have one BTRFS filesystem, both containing / & /home, how do I create subvolumes for both / & /home, and create a snapshot for each and restore from their snapshots (restore snapshots from a live CD)?

arch-linux btrfs

share|improve this question

asked 13 hours ago

ZethexZethex

83

add a comment | 

OS: Arch Linux x86_64

I have one BTRFS filesystem, both containing / & /home, how do I create subvolumes for both / & /home, and create a snapshot for each and restore from their snapshots (restore snapshots from a live CD)?

arch-linux btrfs

share|improve this question

asked 13 hours ago

ZethexZethex

83

share|improve this question

asked 13 hours ago

ZethexZethex

83

share|improve this question

asked 13 hours ago

ZethexZethex

83

asked 13 hours ago

ZethexZethex

83

asked 13 hours ago

ZethexZethex

83

1 Answer
1

active

oldest

votes

1

Creating subvolumes for / and /home

Assuming / is currently the root subvolume of your BTRFS filesystem, you need to first create the subvolumes and then move the directories into their respective subvolumes.

WARNING: Before using any of the following commands, ensure you read about them and understand how they work.

cd /

btrfs subvol create rootfs

btrfs subvol create homefs

cp -a --reflink=always bin usr root var rootfs/ # This is just a sample of directories to copy. But DON'T copy home.

cp -a --reflink=always home/* homefs/

Then, edit /etc/fstab and change the / mountpoint so that it uses the rootfs subvolume. This is done by adding the option (-o) subvol=rootfs. Then, add a mountpoint for /home using the homefs subvolume. You'll also need to update the root filesystem configured in your bootloader.

Finally, reboot and confirm the new mountpoints are being used. If all is well, you can temporarily mount the root subvolume (in a directory such as /root/btrfs) and delete the original directories you copied.

Creating snapshots

Personally, I have a subvolume containing my snapshots. That way I'm able to mount the snapshots at, say. /mnt/snapshots and have easy access to a file I may have accidently deleted.

Setup

mkdir /root/btrfs

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

btrfs subvol create snapshots

Example of taking a read-only snapshot

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

btrfs subvol snapshot -r rootfs snapshots/rootfs-2019-04-11

Restoring from a snapshot

No LiveCD needed to restore from a snapshot. The process is quite simple: rename the subvolume and then create a read-write snapshot from the snapshot of your choosing.

Example of restoring the rootfs snapshot.

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

mv rootfs rootfs-old # Even though rootfs would be mounted, you can still rename it without affecting the running system.

btrfs subvol snapshot snapshots/rootfs-2019-04-10 rootfs

Reboot for the restore to take effect.

share|improve this answer

answered 8 hours ago

Emmanuel RosaEmmanuel Rosa

3,4251612

add a comment | 

Your Answer

StackExchange.ready(function() {
var channelOptions = {
tags: "".split(" "),
id: "106"
};
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function() {
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
}
});

function createEditor() {
StackExchange.prepareEditor({
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader: {
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
},
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
});


}
});

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function () {
StackExchange.helpers.onClickDraftSave('#login-link');
});

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function () {
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2funix.stackexchange.com%2fquestions%2f511885%2fbtrfs-subvolumes-for-home-and-being-able-to-snapshot-and-restore-from-th%23new-answer', 'question_page');
}
);

Post as a guest

Name

Email

Required, but never shown

1

Creating subvolumes for / and /home

Assuming / is currently the root subvolume of your BTRFS filesystem, you need to first create the subvolumes and then move the directories into their respective subvolumes.

WARNING: Before using any of the following commands, ensure you read about them and understand how they work.

cd /

btrfs subvol create rootfs

btrfs subvol create homefs

cp -a --reflink=always bin usr root var rootfs/ # This is just a sample of directories to copy. But DON'T copy home.

cp -a --reflink=always home/* homefs/

Then, edit /etc/fstab and change the / mountpoint so that it uses the rootfs subvolume. This is done by adding the option (-o) subvol=rootfs. Then, add a mountpoint for /home using the homefs subvolume. You'll also need to update the root filesystem configured in your bootloader.

Finally, reboot and confirm the new mountpoints are being used. If all is well, you can temporarily mount the root subvolume (in a directory such as /root/btrfs) and delete the original directories you copied.

Creating snapshots

Personally, I have a subvolume containing my snapshots. That way I'm able to mount the snapshots at, say. /mnt/snapshots and have easy access to a file I may have accidently deleted.

Setup

mkdir /root/btrfs

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

btrfs subvol create snapshots

Example of taking a read-only snapshot

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

btrfs subvol snapshot -r rootfs snapshots/rootfs-2019-04-11

Restoring from a snapshot

No LiveCD needed to restore from a snapshot. The process is quite simple: rename the subvolume and then create a read-write snapshot from the snapshot of your choosing.

Example of restoring the rootfs snapshot.

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

mv rootfs rootfs-old # Even though rootfs would be mounted, you can still rename it without affecting the running system.

btrfs subvol snapshot snapshots/rootfs-2019-04-10 rootfs

Reboot for the restore to take effect.

share|improve this answer

answered 8 hours ago

Emmanuel RosaEmmanuel Rosa

3,4251612

add a comment | 

1

Creating subvolumes for / and /home

Assuming / is currently the root subvolume of your BTRFS filesystem, you need to first create the subvolumes and then move the directories into their respective subvolumes.

WARNING: Before using any of the following commands, ensure you read about them and understand how they work.

cd /

btrfs subvol create rootfs

btrfs subvol create homefs

cp -a --reflink=always bin usr root var rootfs/ # This is just a sample of directories to copy. But DON'T copy home.

cp -a --reflink=always home/* homefs/

Then, edit /etc/fstab and change the / mountpoint so that it uses the rootfs subvolume. This is done by adding the option (-o) subvol=rootfs. Then, add a mountpoint for /home using the homefs subvolume. You'll also need to update the root filesystem configured in your bootloader.

Finally, reboot and confirm the new mountpoints are being used. If all is well, you can temporarily mount the root subvolume (in a directory such as /root/btrfs) and delete the original directories you copied.

Creating snapshots

Personally, I have a subvolume containing my snapshots. That way I'm able to mount the snapshots at, say. /mnt/snapshots and have easy access to a file I may have accidently deleted.

Setup

mkdir /root/btrfs

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

btrfs subvol create snapshots

Example of taking a read-only snapshot

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

btrfs subvol snapshot -r rootfs snapshots/rootfs-2019-04-11

Restoring from a snapshot

No LiveCD needed to restore from a snapshot. The process is quite simple: rename the subvolume and then create a read-write snapshot from the snapshot of your choosing.

Example of restoring the rootfs snapshot.

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

mv rootfs rootfs-old # Even though rootfs would be mounted, you can still rename it without affecting the running system.

btrfs subvol snapshot snapshots/rootfs-2019-04-10 rootfs

Reboot for the restore to take effect.

share|improve this answer

answered 8 hours ago

Emmanuel RosaEmmanuel Rosa

3,4251612

add a comment | 

Creating subvolumes for / and /home

Assuming / is currently the root subvolume of your BTRFS filesystem, you need to first create the subvolumes and then move the directories into their respective subvolumes.

WARNING: Before using any of the following commands, ensure you read about them and understand how they work.

cd /

btrfs subvol create rootfs

btrfs subvol create homefs

cp -a --reflink=always bin usr root var rootfs/ # This is just a sample of directories to copy. But DON'T copy home.

cp -a --reflink=always home/* homefs/

Then, edit /etc/fstab and change the / mountpoint so that it uses the rootfs subvolume. This is done by adding the option (-o) subvol=rootfs. Then, add a mountpoint for /home using the homefs subvolume. You'll also need to update the root filesystem configured in your bootloader.

Finally, reboot and confirm the new mountpoints are being used. If all is well, you can temporarily mount the root subvolume (in a directory such as /root/btrfs) and delete the original directories you copied.

Creating snapshots

Personally, I have a subvolume containing my snapshots. That way I'm able to mount the snapshots at, say. /mnt/snapshots and have easy access to a file I may have accidently deleted.

Setup

mkdir /root/btrfs

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

btrfs subvol create snapshots

Example of taking a read-only snapshot

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

btrfs subvol snapshot -r rootfs snapshots/rootfs-2019-04-11

Restoring from a snapshot

No LiveCD needed to restore from a snapshot. The process is quite simple: rename the subvolume and then create a read-write snapshot from the snapshot of your choosing.

Example of restoring the rootfs snapshot.

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

mv rootfs rootfs-old # Even though rootfs would be mounted, you can still rename it without affecting the running system.

btrfs subvol snapshot snapshots/rootfs-2019-04-10 rootfs

Reboot for the restore to take effect.

share|improve this answer

answered 8 hours ago

Emmanuel RosaEmmanuel Rosa

3,4251612

cd /

btrfs subvol create rootfs

btrfs subvol create homefs

cp -a --reflink=always bin usr root var rootfs/ # This is just a sample of directories to copy. But DON'T copy home.

cp -a --reflink=always home/* homefs/

mkdir /root/btrfs

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

btrfs subvol create snapshots

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

btrfs subvol snapshot -r rootfs snapshots/rootfs-2019-04-11

mount /dev/WHATEVER /root/btrfs

cd /root/btrfs

mv rootfs rootfs-old # Even though rootfs would be mounted, you can still rename it without affecting the running system.

btrfs subvol snapshot snapshots/rootfs-2019-04-10 rootfs

share|improve this answer

answered 8 hours ago

Emmanuel RosaEmmanuel Rosa

3,4251612

answered 8 hours ago

Emmanuel RosaEmmanuel Rosa

3,4251612

answered 8 hours ago

Emmanuel RosaEmmanuel Rosa

3,4251612