The Perfect Xen 3.0.3 Setup For Debian Sarge - Page 2
4 Installing From The Sources
Run the following commands:
apt-get remove exim4 exim4-base lpr nfs-common portmap pidentd pcmcia-cs pppoe pppoeconf ppp pppconfig
apt-get install iproute bridge-utils python-twisted gcc-3.3 binutils make zlib1g-dev python-dev transfig bzip2 screen ssh debootstrap libcurl3-dev libncurses5-dev x-dev
4.1 Install Xen
Now we download xen-3.0.3_0-src.tgz from http://www.xensource.com/xen/downloads/dl_303tarballs.html and unpack it:
cd /usr/src
wget http://bits.xensource.com/oss-xen/release/3.0.3-0/src.tgz/xen-3.0.3_0-src.tgz
tar -xvzf xen-3.0.3_0-src.tgz
Then we compile Xen. This will create one Xen kernel (2.6.16.29-xen). We have to do this before we can create individual kernels for dom0 and domU. This can take a long time so be patient:
cd xen-3.0.3_0-src/
make world
make install
mv /lib/tls /lib/tls.disabled
Now Xen is installed. In order to start the Xen services at boot time, do the following:
update-rc.d xend defaults 20 21
update-rc.d xendomains defaults 21 20
We need a ramdisk for our new Xen kernel, therefore we do the following:
depmod 2.6.16.29-xen
apt-get install libhtml-template-perl libparse-recdescent-perl
wget http://downloads.howtoforge.com/files/yaird_0.0.12-8bpo1_i386.deb
dpkg -i yaird_0.0.12-8bpo1_i386.deb
(The original yaird package was located in http://backports.org/debian/pool/main/y/yaird/, but was removed in the meantime, so I've made the package available under http://downloads.howtoforge.com/files/yaird_0.0.12-8bpo1_i386.deb.)
mkinitrd.yaird -o /boot/initrd.img-2.6.16.29-xen 2.6.16.29-xen
The last command creates the ramdisk /boot/initrd.img-2.6.16.29-xen.
Next we add our new kernel to Grub, our bootloader. Edit /boot/grub/menu.lst, and before the line ### BEGIN AUTOMAGIC KERNELS LIST add the following stanza:
vi /boot/grub/menu.lst
[...] title Xen 3.0.3 / XenLinux 2.6 root (hd0,0) kernel /xen.gz dom0_mem=64000 module /vmlinuz-2.6-xen root=/dev/hda6 ro max_loop=255 module /initrd.img-2.6.16.29-xen [...] |
Make sure that /dev/hda6 is your / partition. Keep in mind what I said about Grub and partitioning in chapter 1! I added max_loop=255 to the module line to make sure that enough loop devices are available because or virtual machines will be mounted as loop devices.
Now reboot the system:
shutdown -r now
At the boot prompt, Grub should now list Xen 3.0.3 / XenLinux 2.6 as the first kernel and boot it automatically. If your system comes up without problems, then everything is fine!
4.2 Compile A dom0 Kernel
Now we compile a dom0 kernel:
cd /usr/src/xen-3.0.3_0-src/
make linux-2.6-xen0-config CONFIGMODE=menuconfig KERNELS="linux-2.6-xen0"
In the kernel comfiguration menu that shows up we enable quota, iptables and the dummy network driver as modules. This is where you enable these modules:
File systems --> [*] Quota support
<M> Old quota format support
<M> Quota format v2 support
Device Drivers ---> Network device support ---> <M> Dummy net driver support
Networking ---> Networking options ---> [*] Network packet filtering (replaces ipchains) ---> Core Netfilter Configuration ---> <M> Netfilter Xtables support (required for ip_tables)
Networking ---> Networking options ---> [*] Network packet filtering (replaces ipchains) ---> IP: Netfilter Configuration ---> <M> IP tables support (required for filtering/masq/NAT)
[*] means: build into the kernel statically.
<M> means: build as a kernel module.
Next we build and install the dom0 kernel:
make linux-2.6-xen0-build
make linux-2.6-xen0-install
depmod 2.6.16.29-xen0
Next we add our new kernel to Grub, our bootloader. Edit /boot/grub/menu.lst, and before the line ### BEGIN AUTOMAGIC KERNELS LIST add the following stanza (please delete or comment out the stanza you added in chapter 4.1!):
vi /boot/grub/menu.lst
[...] title Xen 3.0.3 / XenLinux 2.6 root (hd0,0) kernel /xen.gz dom0_mem=64000 module /vmlinuz-2.6-xen0 root=/dev/hda6 ro max_loop=255 [...] |
Make sure that /dev/hda6 is your / partition. Keep in mind what I said about Grub and partitioning in chapter 1!
Now reboot the system:
shutdown -r now
At the boot prompt, Grub should now list Xen 3.0.3 / XenLinux 2.6 as the first kernel and boot it automatically. If your system comes up without problems, then everything is fine!
4.3 Compile A domU Kernel
Afterwards we compile a kernel for domU (the virtual machines):
cd /usr/src/xen-3.0.3_0-src/
make linux-2.6-xenU-config CONFIGMODE=menuconfig KERNELS="linux-2.6-xenU"
In the kernel comfiguration menu that shows up we have to enable quota and iptables as modules (it is important that they are modules. I could not get iptables to work in a virtual machine when I compiled it into the kernel statically!). This is where you enable these modules:
File systems --> [*] Quota support
<M> Old quota format support
<M> Quota format v2 support
Networking ---> Networking options ---> [*] Network packet filtering (replaces ipchains) ---> Core Netfilter Configuration ---> <M> Netfilter Xtables support (required for ip_tables)
Networking ---> Networking options ---> [*] Network packet filtering (replaces ipchains) ---> IP: Netfilter Configuration ---> <M> IP tables support (required for filtering/masq/NAT)
[*] means: build into the kernel statically.
<M> means: build as a kernel module.
After you have left the kernel configuration menu, do the following to build and install the domU kernel:
make linux-2.6-xenU-build
make linux-2.6-xenU-install
depmod 2.6.16.29-xenU
