Author: steini

BG 3.25
As the ignorant act out of attachment to action, O Bharata, so should the wise act without attachment, wishing for the welfare of the world.

BG 18.19
Knowledge, action, and actor are declared in the science of the Gunas (Sankhya philosophy) to be of three kinds only, according to the distinction of the Gunas. Of these, hear duly.

BG 14.20
The embodied one, having crossed beyond these three Gunas from which the body is evolved, is freed from birth, death, decay, and pain, and attains immortality.

r w x

4 2 1

7=r+w+x

6=r+w

5=r+x

Shrink partition with resize2fs
'resize2fs' to get the desired filesystem size
'tune2fs -l' to determine the filesystem look for 'Block size' and 'Block count'

tune2fs -l /dev/sdb1

'parted' to determine the partition's 'Start' sector (first set 'unit' to 's'), unit s,

Compute the partition 'End' sector:
'End' = 'Start' + (('Block size' * 'Block count') / 512) - 1

'parted' to resize the partition using the computed 'End' value (first set 'unit' to 's')

'parted /dev/sdX resizepart 2 <new_last_sector_number>s
(See 'man resize2fs' and 'man parted' for command details)
blkid, vim /etc/fstab, systemctl daemon-reload, lsblk

resize2fs /dev/sdb1 250G 
tune2fs -l /dev/sdb1 - Block count: 65536000, First block: 0, Block size: 4096

qalc

2048 + ((4096 × 65536000) / 512) − 1 = 524290047

parted

parted /dev/sdb, unit s, print, (parted) resizepart 1 524290047, e2fsck -f /dev/sdb1

modify image

inspection;
fdisk -l raw_img_file.img 
mount -o loop offset=1048576(start sector*512) raw_img_file.img /mnt/img 
umount /mnt/img,   

Add space to the image; 
df -h /mnt/img 
parted raw_img_file.img 
print free 
quit 
dd if=/dev/zero bs=1M count=512 >> raw_img_file.img pated raw_img_file.img, unit s, resizepart 1 2444222s (last sector 's')
print free
kpartx -av raw_img_file.img 
ls /dev/mapper
e2fsck -f -y -v -C 0 /dev/mapper/loop0p1
resize2fs -p /dev/mapper/loop0p1
kpartx -d raw_img_file.img
umount /mnt/img
kpartx -d raw_img_file.img 
kpartx -av raw_img.file.img, mount /dev/mapper/loop0p1 /mnt/img 
chroot short version
mount -t proc proc /mnt/img/proc
mount -t sysfs sys /mnt/img/sys
mount -o bind /dev /mnt/img/dev
mount -t devpts pts /mnt/img/dev/pts
chroot /mnt/img
exit

umount /mnt/img/dev/pts
umount /mnt/img/dev
umount /mnt/img/sys
umount /mnt/img/proc
umount /mnt/img
kpartx -d raw_img_file.img

shrinking .img

umount /dev/sdc1 umount /mnt/sdc2dd if=/dev/sdc of=my_image.img modprobe loop
losetup -f 
losetup /dev/loop0 my_image.img
prtprobe /dev/loop0
gparted /dev/loop0
resize, losetup -d/dev/loop0 (deattach)
find last sector fdisk -l my_image.img 
   The last block was 9181183 and block-numbers start at 0. That means we need (9181183+1)*512 bytes. truncate --size=$[(9181183+1+33)*512] my_image.img,  

– 33 extra sectors are needed for the backup GPT partition tablem use gdisk my_image.img and then use the w command to repair the partition table.

– if GPT backup partition table at the end of the disk was already removed, there is fix. Add 33 sectors with dd if=/dev/zero bs=512 count=33 >> myimage.img. And fix it with gdisk myimage.img and use w command.

or parted /dev/loop0, print, unit s,
resizepart 2(1) 111111s (to sector), quit

Short version of cryptsteup open, mount, umount, cryptsetup close

- blkid | grep crypto

cryptsetup open /dev/nvme0n1p2 secret
mount /dev/mapper/secret /mnt/secret
umount /mnt/secret
crypstsetup close secret

Crypt partition with cryptsetup;

* cryptsetup loksFormat /dev/sdd2 <-- format drive 
* cryptsetup open /dev/sdd2 luks
* mkfs.ext4 /dev/mapper/luks
* crypsteup mount /dev/mapper/luks /mnt/luks
* crypsetup open /dev/sdd2 luks

* cryptsetup status luks
* umount /mnt/luks
* cryptsetup close luks

* crypsetup luksChangeKey /dev/sdd2

Include and exclude with rsync -avv –include-from.

So here is a ultra short howto. First have to be the pluses (include) of the map end then the minuses (exclude).

rsync -avv –include-from=’rsync_home_apr25′ /home/bob/ /media/backup/experiment/

rsync_home_apr25

+ include_file1
+ include_file2
+ include_map/
+ .config/foot
+ .config/mpv
- .config/*
+ map/
+ map/under_map1
+ map/under_map2
- map/*
- /*