Tested on Red Hat 7.3

user mode linux 2.4.18.36um-0

Installation

Install UML and prepare an image file.

# rpm -ihv user_mode_linux-2.4.18.36um-0.i386.rpm
# bunzip2 -d root_fs.rh-7.2-full.pristine.20020312.bz2
# mv root_fs.rh-7.2-full.pristine.20020312 rh72.img

if you want to run UML by general user, and use network, you need to change permission of TUN/TAP device as.

# ls -lt /dev/net/tun
# crw------- 1 root root 10, 200 Jan 30 16:24 /dev/net/tun
# chmod go+rw /dev/net/tun
# crw-rw-rw- 1 root root 10, 200 Jan 30 16:24 /dev/net/tun

Start UML linux and make diff file. Default accounts are
ID=root PASS=root
ID=user PASS=user
If an IP Address of host OS is 192.168.0.103, then

# linux ubd0=rh72.diff,rh72.img eth0=tuntap,,,192.168.0.103
...
Unauthorized access to this system is strictly prohibited.
redhat72 login: root
Password:
Login incorrect

login: root
Password:
Login incorrect

login: root
Password:
You are required to change your password immediately (password aged)
Changing password for root
(current) UNIX password:
Enter new UNIX password:
Retype new UNIX password:

Shutdown guest OS

# /sbin/shutdown -h 0

Start UML linux.

# linux ubd0=rh72.diff eth0=tuntap,,,192.168.0.103

Host Filesystem

Guest OS can access Host OS file system using Host Filesystem

It can mount root directory of Host OS to /mnt/home on Guest OS

# mount none /mnt/home -t hostfs

If you want to specify the directory of Host OS

# mount none /mnt/home -t hostfs -o /home/hoge

Back