Compiling the OpenVZ kernel (the Debian way)

Installing sources

To install the kernel-source and the OpenVZ kernel patch, run:

# apt-get install kernel-package linux-source-2.6.18 kernel-patch-openvz libncurses5-dev

Unpacking

Unpack the kernel source:

 # cd /usr/src
 # tar xjf linux-source-2.6.18.tar.bz2
 # cd linux-source-2.6.18

Kernel config

You need a kernel config. You can use the config of the debian-kernel:

# cp /boot/config-2.6.18-5-686 .config

Or get a 2.6.18 kernel configuration from http://download.openvz.org/kernel/branches/2.6.18/current/configs/ (depending on your architecture; the below example is for i686):

# wget http://download.openvz.org/kernel/branches/2.6.18/current/configs/kernel-2.6.18-i686.config.ovz -O .config

Patching and configuring

Now you can apply the openvz kernel patch and modify your kernel-config:

# ../kernel-patches/all/apply/openvz
# make menuconfig

You need the following OpenVZ kernel config settings: (taken from OpenVZ Kernel 2.6.18-028test010.1 on 686)

Filesystem
\_ [*] Second extended fs support (CONFIG_EXT2_FS)
\_ [*] Ext3 journalling file system support (CONFIG_EXT3_FS)
\_ [M] Quota Support (CONFIG_QUOTA)
	\_ [*] Compatibility with older quotactl interface (CONFIG_QUOTA_COMPAT)
	\_ [*]Quota format v2 support (CONFIG_QFMT_V2)
\_ [*] VPS filesystem (CONFIG_SIM_FS)
\_ [M] Virtuozzo Disk Quota support	(CONFIG_VZ_QUOTA)
	\-> [*] Per-user and per-group quota in Virtuozzo quota partitions (VZ_QUOTA_UGID)

Security
	\->[ ] Enable different security models

OpenVZ ... (what else :-)
\_[*] Virtual Environment support (CONFIG_VE)
	\_ <M> VE calls interface (CONFIG_VE_CALLS)
	\_ <M> VE networking (CONFIG_VE_NETDEV)
	\_ <M> Virtual ethernet device (CONFIG_VE_ETHDEV)
	\_ <M> VE device (CONFIG_VZ_DEV)
	\_ [*] VE netfiltering (CONFIG_VE_IPTABLES)
	\_ <M> VE watchdog module (CONFIG_VZ_WDOG)
	\_ <M> Checkpointing & restoring Virtual Environments (CONFIG_VZ_CHECKPOINT)

User resources ... (User Beancounters)
\_ [*] Enable user resource accounting (CONFIG_USER_RESOURCE)
\_ [*] Account physical memory usage ( CONFIG_USER_RSS_ACCOUNTING)
\_ [*] Account disk IO (CONFIG_UBC_IO_ACCT)
\_ [*] Account swap usage (CONFIG_USER_SWAP_ACCOUNTING)
\_ [*] Report resource usage in /proc (CONFIG_USER_RESOURCE_PROC)
\_ [*] User resources debug features (CONFIG_UBC_DEBUG)
\_ [*] Debug kmemsize with cache counters (CONFIG_UBC_DEBUG_KMEM)

Note: better to build the kernel-headers as well, so afterward other kernel-modules can be built without whole kernel tree (e.g. drbd -> drbd0.7-module-source)

See also : "make-kpkg --targets"

Compiling

Compile your kernel (as user root, or you need the --rootcmd!)

# make-kpkg --append_to_version=-1-openvz --added_patches=openvz --revision=1 --initrd binary-arch
or all above with one step 
# make-kpkg --append_to_version=-1-openvz --added_patches=openvz --revision=1 --initrd --config menuconfig binary-arch

Installing

Install the kernel and update initramfs:

# dpkg -i ../linux-image-2.6.18-1-openvz_1_i386.deb
# update-initramfs -c -k 2.6.18-1-openvz

Note: update-initramfs is done, when make-kpkg is use with --initrd option

http://wiki.openvz.org/Installation_on_Debian_%28etch%29#Install_the_toolset

Note: update-grub can be configured by /etc/kernel-img.conf

Bootloader

Update the bootloader (if not done before)

GRUB :

# /usr/sbin/update-grub

Note: since the Debian Etch release the location of update-grub is moved from /sbin/update-grub to /usr/sbin/update-grub

Installing the Tools and Configuring

Continue from here for Etch (current stable): Installation on Debian (etch)#Install the toolset

Continue from here for Sarge (old stable): Installation on Debian (sarge)#Installing the toolset and debian-os-template