Here is a procedure to create ramdisk on Linux.
1. Look for ramdisk devices :
ls -la /dev/ram*
2. Increase size by adding the kernel parameter in the grub config file
(this example assume you want a 512 Mb ramdisk) :
ramdisk_size=512000
3. Format the ramdisk :
mke2fs -m 0 /dev/ram0
4. Mount the ramdisk :
mkdir /mnt/ramdisk mount /dev/ram0 /mnt/ramdisk
5. Umount the ramdisk :
umount -v /mnt/ramdisk
6. Automated ramdisk creation (add to init) :
/sbin/mke2fs -q -m 0 /dev/ram0 /bin/mount /dev/ram0 /mnt/ramdisk /bin/chown root:root /mnt/ramdisk /bin/chmod 0750 /mnt/ramdisk