luks encrypted container

create a contaniner file

touch vault.img

chattr +C vault.img # for btrfs only to disable NoCow

allocate storage to the vault, choose it wisely its not that simple to resize later

fallocate -l 20G vault.img

encrypt the container with luks

cryptsetup luksFormat vault.img

you can open and close the vault using cryptsetup command

# to open
sudo cryptsetup open vault.img vault

# to close
sudo cryptsetup close vault

now since the vault is open and encrypted, but what is a contiainer without a file system we are going to make the container ext4 you can anything else.

sudo mkfs.ext4 /dev/mapper/vault 

well thats it for it to start working and showing up in your file manager but you can mount it to a mount point like

sudo mount /dev/mapper/vault /mnt/vault

add alias to open and close vaults

alias vaultmount="sudo cryptsetup open ~/.local/state/vault.img vault && sudo mount /dev/mapper/vault /mnt/vault"
alias vaultumount="sudo umount /mnt/vault && sudo cryptsetup close vault"

thats it everything is done now, you can add it in fstab to auto mount but i dont want to do that.