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Creating a RAMDISK
Here is the procedure to create a RAMDISK. This is especially useful if you want to increase the size of an existing RAMDISK.
1. Create a file of zeroes for the size of the ramdisk you want. This example assumes a 32MB file system
[root@localhost jjd]# dd if=/dev/zero of=ramdisk bs=1M count=32 32+0 records in 32+0 records out 33554432 bytes (34 MB) copied, 0.243921 s, 138 MB/s
2. Format the file as a file system.
[root@localhost jjd]# mkfs ramdisk mke2fs 1.40.8 (13-Mar-2008) ramdisk is not a block special device. Proceed anyway? (y,n) y Filesystem label= OS type: Linux Block size=1024 (log=0) Fragment size=1024 (log=0) 8192 inodes, 32768 blocks 1638 blocks (5.00%) reserved for the super user First data block=1 Maximum filesystem blocks=33554432 4 block groups 8192 blocks per group, 8192 fragments per group 2048 inodes per group Superblock backups stored on blocks: 8193, 24577 Writing inode tables: done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 35 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override.
3. Use the loop file system to mount it.
[root@localhost jjd]# mkdir mnt [root@localhost jjd]# mount -o loop ramdisk mnt
4. Copy your root file system to mnt. Here you can copy a file system from an existing RAMDISK (see this link), and add other files as needed.
[root@localhost jjd]# cp -r <path/to/filesys>/* mnt
5. Unmount the image
[root@localhost user]# umount mnt
5. Zip it up!
[root@localhost user]# gzip ramdisk
7. You should end up with a compressed ramdisk.gz