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Add BTRFS and Luks docs

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Add docs explaining how to use luks and btrfs on arch.
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ducoterra
2022-01-31 13:47:30 -05:00
parent 92a4acf415
commit 9f5e3ac542
1 changed files with 70 additions and 1 deletions
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README.md
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@@ -10,7 +10,6 @@ Setup
```bash
pip install --user ansible
sudo mkdir -p /etc/ansible && sudo cp hosts /etc/ansible/hosts
```
Run an ad-hoc command
@@ -24,3 +23,73 @@ Run a playbook
```bash
ansible-playbook -i hosts --ask-become-pass playbooks/pi.yaml
```
Run the manjaro playbook
```bash
ansible-playbook --ask-become-pass ansible/setup-full.yml
```
## BTRFS
https://linoxide.com/how-to-take-backup-with-btrfs-snapshots/
```bash
# Create backup subvolume
btrfs subvolume create /mnt/backup/DucoBacktop
# Create snapshot dir
mkdir /.snapshots
# Create readonly snapshot
```bash
SNAPSHOT_TIME=$(date +"%y_%m_%d-%H.%M")
SNAPSHOT_NAME=home_$SNAPSHOT_TIME
SNAPSHOT_DIR=/.snapshots
btrfs subvolume snapshot -r /home $SNAPSHOT_DIR/$SNAPSHOT_NAME
# Send a snapshot with no previous snapshot
export SNAPSHOT_DIR=${SNAPSHOT_DIR:=/.snapshots}
export BACKUP_DIR=${BACKUP_DIR:=/mnt/backup0/DucoBacktop}
btrfs send $SNAPSHOT_DIR/$SNAPSHOT_NAME | btrfs receive $BACKUP_DIR
# Send a snapshot with previous snapshot
export SNAPSHOT_DIR=${SNAPSHOT_DIR:=/.snapshots}
export BACKUP_DIR=${BACKUP_DIR:=/mnt/backup0/DucoBacktop}
export LATEST=${LATEST:=/previous_snapshot}
btrfs send -p $SNAPSHOT_DIR/$LATEST $SNAPSHOT_DIR/$SNAPSHOT_NAME | btrfs receive $BACKUP_DIR
# Clean up snapshots
find /.snapshots -maxdepth 1 -type d -not -path /.snapshots -exec sudo btrfs subvolume delete {} \;
```
# Luks
```bash
# LUKS Disk Encryption can use up to 8 key slots to store passwords. We can use these keys to auto mount LUKS device.
# cryptsetup luksDump /dev/sda
# Create a lukskeys
mkdir /home/ducoterra/.lukskeys
# Generate key
dd if=/dev/random bs=32 count=1 of=/home/ducoterra/.lukskeys/backup0
# Change key mode
chmod 600 /home/ducoterra/.lukskeys
# Luks add a key
sudo cryptsetup luksAddKey /dev/sda /home/ducoterra/.lukskeys/backup0
# Get UUID of disk with
sudo blkid /dev/sda
# Add key to crypttab
echo 'backup0 UUID=1d7ce570-e695-47a0-9dda-5f14b5b20e21 /home/ducoterra/.lukskeys/backup0 luks' > /etc/cryptab
# Create backup mount point
sudo mkdir -p /mnt/backup0
# Add to fstab
echo '/dev/mapper/backup0 /mnt/backup0 btrfs defaults,noatime,compress=zstd 0 0' > /etc/fstab
```