User Mode Linux
> Will I be able to run UML (skas or not) on a plain RH 9 machine?
uml tools comes with RH9. you can find some in /usr/bin/uml_* . so, you need to get "linux" command (uml kernel) and config file. from: http://kernels.usermodelinux.org/kernels/ I used linux-2.4.20-6um.
- put "linux" in /usr/bin/ as executable. (chmod +x /usr/bin/linux)
- put "dotconfig" in /usr/lib/uml/ as "config".
some files need to change the mode. RH9 kept them secure.
# chmod u+s /usr/bin/uml_net # chmod g+rw,o+rw /dev/net/tun
download disk image file from http://user-mode-linux.sourceforge.net/dl-fs-sf.html I got Debian-3.0r0.ext2.bz2 which is Debian 3.0r0 minimum installation.
I explain with this case.
$ bunzip2 Debian-3.0r0.ext2.bz2 ... this fs is almost full, to expand fs to 512mb is... $ dd if=/dev/zero of=Debian-3.0r0.ext2 bs=1 count=0 seek=512MB $ resize2fs -p Debian-3.0r0.ext2 ... starting linux $ linux ubd0=Debian-3.0r0.ext2.diff,Debian-3.0r0.ext2 eth0=tuntap,,,192.168.1.100192.168.1.100 is any valid and unused IP on your LAN. you can login as root without password.
UML# echo debian.mynet >/etc/hostname UML# /etc/init.d/hostname.sh
set networkedit /etc/network/interfaces and add these lines:
----- auto lo eth0 iface lo inet loopback iface eth0 inet static address 192.168.1.101 netmask 255.255.255.0 gateway 192.168.1.1 ---------192.168.1.101 is any valid and unused IP address of your network. So, this UML setup uses two IP addresses, one for host side, another for guest side.
edit /etc/resolv.conf and add your name servers.
------- nameserver 192.168.1.3 nameserver 192.168.1.4 -------
now, you can start network.
# /etc/init.d/network start
you can ping anywhere in the world.
you can access files on the host side.
# mount none /mnt -t hostfsnow, /mnt is the / of host OS. you can read/write.
if you want to install something more, use apt-get. for example, to install apache web server:
# apt-get update --- to get the latest list of package, then # apt-get install apache
you can see the test page from your host OS by http://192.168.1.101/
# haltto shutdown Debian...
from 2nd time, you can start UML without real disk image.
$ linux ubd0=Debian-3.0r0.ext2.diff eth0=tuntap,,,192.168.1.100
love and fun
--Setu 19:51 21 Oct 2003 (JST)
Making file partition biggerThis is very simple. You can read article here.
- first, stop UML
- make single file from fs file and COW file.
- uml_moo Debian-3.0r0.ext2.diff Debian-3.0r0.4gb.ext2
- new fs is Debian-3.0r0.4gb.ext2 in above sample
- checking new fs
- e2fsck -f filename
- making fs for 4GB but it uses around 64MB + "fs system area".
- dd if=/dev/zero of=Debian-3.0r0.4gb.ext2 bs=1 count=0 seek=4gb
- expand file system
- resize2fs -p Debian-3.0r0.4gb.ext2
- linux ubd0=Debian-3.0r0.4gb.ext2.diff,Debian-3.0r0.4gb.ext2 eth0=tuntap,,,192.168.1.100
- linux ubd0=Debian-3.0r0.4gb.ext2.diff eth0=tuntap,,,192.168.1.100
giving more memory for UML
add option at the command line to start: example: linux mem=64M ubd0=Debian-3.0r0.4gb.ext2.diff eth0=tuntap,,,192.168.1.100
You can read all the command option by "linux --help"
making swap area
Making swap fs, next example is making 128MB swap.
- at the host
- dd if=/dev/zero of=128mb.swap seek=128 count=1 bs=1M
- linux mem=64M ubd0=Debian-3.0r0.4gb.ext2.diff ubd1=128mb.swap eth0=tuntap,,,192.168.1.100
- initialize as swap partition. follows are in UML
- mkswap -c /dev/ubd/1
- /dev/ubd/1 swap swap defaults 0 0
- swapon -av
- total used free shared buffers cached
- Mem: 61772 22588 39184 0 708 4920
- -/+ buffers/cache: 16960 44812
- Swap: 132088 0 132088