Difference between revisions of "How to create and modify ramdisk img"

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(Created page with " dd if=/dev/zero of=TS7350SD_IsacDhcpBootShrunk.img bs=1k count=1536000 sfdisk -d TS7350SD_IsacDhcpBoot.img | sfdisk TS7350SD_IsacDhcpBootShrunk.img fdisk -l TS7350SD_IsacDh...")
 
 
(4 intermediate revisions by the same user not shown)
Line 1: Line 1:
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  dd if=/dev/zero of=TS7350SD_IsacDhcpBootShrunk.img bs=1k count=1536000
+
Calculate count size:
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  sfdisk -d TS7350SD_IsacDhcpBoot.img | sfdisk TS7350SD_IsacDhcpBootShrunk.img
+
1024x1500 = 1.5Gb img file
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  fdisk -l TS7350SD_IsacDhcpBootShrunk.img
+
 
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  kpartx -av TS7350SD_IsacDhcpBoot.img
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Create 1.5GB ramdisk file:
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  kpartx -av TS7350SD_IsacDhcpBootShrunk.img
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  dd if=/dev/zero of=target.img bs=1k count=1536000
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  dd bs=1k if=/dev/mapper/loop1p1 of=/dev/mapper/loop2p1
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Clone partition table from source to target:
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  dd bs=1k if=/dev/mapper/loop1p2 of=/dev/mapper/loop2p2
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  sfdisk -d source.img | sfdisk target.img
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  dd bs=1k if=/dev/mapper/loop1p3 of=/dev/mapper/loop2p3
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Check partition table:
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  mount /dev/mapper/loop1p4 /mnt/ramdisk
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  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
 
  mkfs.ext4 /dev/mapper/loop2p4
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  mount /dev/mapper/loop2p4 /mnt/ramdisk2/
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Mount empty target partition
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  cd /mnt/ramdisk2/
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  mount /dev/mapper/loop2p4 /mnt/target
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rm -rf lost+found/
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Copy files and folders from source to target:
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cp -pR ../ramdisk/* .
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  cp -pR /mnt/source/* /mnt/target/
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cd ..
+
Unmount source:
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  umount ramdisk
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  umount /mnt/source/
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  umount ramdisk2/
+
Unmount target:
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cd /home/srapaz/Temp
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  umount /mnt/target/
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  kpartx -d TS7350SD_IsacDhcpBoot.img
+
Delete partition mappings of source:
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  kpartx -d TS7350SD_IsacDhcpBootShrunk.img
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  kpartx -d source.img
 +
Delete partition mappings of source:
 +
  kpartx -d target.img

Latest revision as of 21:40, 21 March 2019

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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