How to create and modify ramdisk img

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Calculate count size: 

1024x1500 = 1.5Gb img file

Create 1.5GB ramdisk file: 

dd if=/dev/zero of=target.img bs=1k count=1536000

Clone partition table from source to target: 

sfdisk -d source.img | sfdisk target.img

Check partition table: 

fdisk -l target.img

Automatically add partition mappings(s) from source partition table: 

kpartx -av source.img

Automatically add partition mappings(s) from target partition table: 

kpartx -av target.img

DD partitions from source to target 

dd bs=4M if=/dev/mapper/loop1p1 of=/dev/mapper/loop2p1
dd bs=4M if=/dev/mapper/loop1p2 of=/dev/mapper/loop2p2
dd bs=4M if=/dev/mapper/loop1p3 of=/dev/mapper/loop2p3

Mount source partition: 

mount /dev/mapper/loop1p4 /mnt/source

Create file system on target partition to be resized: 

mkfs.ext4 /dev/mapper/loop2p4

Mount empty target partition 

mount /dev/mapper/loop2p4 /mnt/target

Copy files and folders from source to target: 

cp -pR /mnt/source/* /mnt/target/

Unmount source: 

umount /mnt/source/

Unmount target: 

umount /mnt/target/

Delete partition mappings of source: 

kpartx -d source.img

Delete partition mappings of source: 

kpartx -d target.img
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