Difference between revisions of "FAQ/Howto"

Revision as of 23:47, 20 June 2017

Some frequently useful configuration options:

Move your /home to a flash drive [this is a work in progress, please do not edit yet]

It is not recommended to mount your /home to an external USB Flash Drive because if you loose it you gonna be in trouble. However you can move your /home folders to an external place and free some storage.

Encrypt your flash drive

Flash drives are easy to loose. If you don't want anyone looking around your data, you should encrypt your flash drive. I will not detail this part, as data encryption are complex and you have better and complete information at https://wiki.archlinux.org/index.php/Dm-crypt/Encrypting_an_entire_system

Step 1: Encrypt the entire flash drive:

   $ sudo cryptsetup -v -c aes-xts-plain64 -s 512 -h sha512 --use-random luksFormat /dev/sdX

You should change /dev/sdX for your flashdrive/sdcard. Be carefully, this may lead to data damage.

Step 2: Open the encrypted content:

   $ sudo cryptsetup luksOpen /dev/sdX HomeGaOS

This you map your unlock device to /dev/mapper/HomeGaOS

Step 3: Create the file system:

   $ sudo mkfs.ext4 /dev/mapper/HomeGaOS

Add an encryption key to the flashdrive

To automatically mount the flash drive without having to type the password we gonna create an encryption key and add it to the flash drive

Step 1: Generate the key

   $ sudo dd if=/dev/urandom of=/etc/keys/GaOS-Home.key bs=1024 count=4 

I'm assuming the keyfile gonna be stored at /etc/keys folder. This will create a file with random content with the size of 4096 bits. You can use any file to act as keyfile. A 4kb file with random content is good enough.

Step 2: Make the keyfile read-only to root:

   $ sudo chmod 0400 /root/keyfile 

Alternatively you can chown your keyfile to root:root and move it into the /root folder or other place.

Step 3: Add the keyfile to LUKS

   $ sudo cryptsetup luksAddKey /dev/sdX /etc/keys/keyfile 

Source: https://www.howtoforge.com/automatically-unlock-luks-encrypted-drives-with-a-keyfile

Create udev rules

(WIP: pasting content from https://paste.ubuntu.com/24558174/, please improve!)

   ## /etc/udev/rules.d/10-usbdrive.rules
   KERNEL=="sd*", ATTRS{serial}=="0340918060002807", ATTRS{idVendor}=="090c", ATTRS{idProduct}=="1000" SYMLINK+="usb/samsung%n"
   
   ## /etc/fstab
   /dev/usb/samsung1 /media/usb1 ext4 defaults,discard,relatime,nofail 0 2
   
   ## values for serial, idVendor, and idProduct are visible in dmesg output:
   ## run "dmesg -w" while inserting USB drive

Create systemd service

Move the /home folders to the flashdrive

Create symlinks