Compiling Kernel 2.6.32: Difference between revisions
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Download the kernel from xen.git and checkout the long-term maintained 2.6.32.x branch: |
Download the kernel from xen.git and checkout the long-term maintained 2.6.32.x branch: |
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<pre |
<pre> |
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# git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git linux-2.6-xen |
# git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git linux-2.6-xen |
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# cd linux-2.6-xen |
# cd linux-2.6-xen |
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# git checkout -b xen/stable-2.6.32.x origin/xen/stable-2.6.32.x |
# git checkout -b xen/stable-2.6.32.x origin/xen/stable-2.6.32.x |
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</pre> |
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Note! If "git clone" fails, it's most probably caused by a network problem on your end. Some broken firewalls, nat-routers, and proxies cause problems with the git clone. |
Note! If "git clone" fails, it's most probably caused by a network problem on your end. Some broken firewalls, nat-routers, and proxies cause problems with the git clone. |
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Example output from git: |
Example output from git: |
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<pre |
<pre> |
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[root@f13 kernel]# git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git linux-2.6-xen |
[root@f13 kernel]# git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git linux-2.6-xen |
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Cloning into linux-2.6-xen... |
Cloning into linux-2.6-xen... |
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[root@f13 linux-2.6-xen]# |
[root@f13 linux-2.6-xen]# |
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</pre> |
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==Configure the kernel== |
==Configure the kernel== |
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You can run make menuconfig, and go through the config file to manually activate the relevant Xen options. (Hint: Press the '/' key to bring up a search option, and search for 'xen'. |
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<pre><nowiki> |
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<pre> |
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# wget -O .config http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.32.25-pvops-dom0-xen-stable-x86_64 |
# wget -O .config http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.32.25-pvops-dom0-xen-stable-x86_64 |
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# make oldconfig |
# make oldconfig |
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</pre> |
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'''Note the example config-file above is DEBUG-enabled possibly causing big performance hits, so don't use it for performance testing!''' |
'''Note the example config-file above is DEBUG-enabled possibly causing big performance hits, so don't use it for performance testing!''' |
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==Building the kernel== |
==Building the kernel== |
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Next, build the kernel. |
Next, build the kernel. |
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Note: Replace "4" in "-j4" by the number of physical CPU cores you have to speed up the compilation: |
Note: Replace "4" in "-j4" by the number of physical CPU cores you have to speed up the compilation: |
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<pre |
<pre> |
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# make clean |
# make clean |
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# make -j4 bzImage && make -j4 modules |
# make -j4 bzImage && make -j4 modules |
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</pre> |
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After successful compilation install the the kernel modules and the kernel itself. In this example we assume the kernel version is "2.6.32.25": |
After successful compilation install the the kernel modules and the kernel itself. In this example we assume the kernel version is "2.6.32.25": |
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<pre |
<pre> |
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# make modules_install |
# make modules_install |
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# depmod -a 2.6.32.25 |
# depmod -a 2.6.32.25 |
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# cd /boot |
# cd /boot |
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# dracut initramfs-2.6.32.25.img 2.6.32.25 |
# dracut initramfs-2.6.32.25.img 2.6.32.25 |
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</pre> |
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Don't worry about the warnings from dracut. Dracut might take a couple of minutes to execute. Example dracut output: |
Don't worry about the warnings from dracut. Dracut might take a couple of minutes to execute. Example dracut output: |
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<pre |
<pre> |
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[root@f13 boot]# dracut initramfs-2.6.32.25.img 2.6.32.25 |
[root@f13 boot]# dracut initramfs-2.6.32.25.img 2.6.32.25 |
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grep: /usr/share/plymouth/themes/.plymouth/.plymouth.plymouth: No such file or directory |
grep: /usr/share/plymouth/themes/.plymouth/.plymouth.plymouth: No such file or directory |
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The default plymouth plugin () doesn't exist |
The default plymouth plugin () doesn't exist |
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[root@f13 boot]# |
[root@f13 boot]# |
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</pre> |
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[[Category:Users]] |
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[[Category:Developers]] |
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[[Category:Tutorial]] |
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[[Category:Xen]] |
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Latest revision as of 16:27, 28 November 2011
This document currently assumes you are using Fedora/RHEL/CentOS to do the compilation. For other distributions (ie. Ubuntu/Debian), you'll need to use the respective package management software to get the packages.
Compiling the kernel from source - Getting ready
To actually build the kernel from source, you’ll need to download the compilers and such. To do so, run
# yum groupinstall "Development Libraries" "Development Tools" # yum install transfig wget texi2html libaio-devel dev86 glibc-devel e2fsprogs-devel gitk mkinitrd iasl xz-devel bzip2-devel pciutils-libs pciutils-devel SDL-devel libX11-devel gtk2-devel
Getting the kernel source
Download the kernel from xen.git and checkout the long-term maintained 2.6.32.x branch:
# git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git linux-2.6-xen # cd linux-2.6-xen # git checkout -b xen/stable-2.6.32.x origin/xen/stable-2.6.32.x
Note! If "git clone" fails, it's most probably caused by a network problem on your end. Some broken firewalls, nat-routers, and proxies cause problems with the git clone.
Example output from git:
[root@f13 kernel]# git clone git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen.git linux-2.6-xen Cloning into linux-2.6-xen... remote: Counting objects: 1748126, done. remote: Compressing objects: 100% (292844/292844), done. Receiving objects: 100% (1748126/1748126), 359.40 MiB | 34.70 MiB/s, done. remote: Total 1748126 (delta 1452892), reused 1733298 (delta 1439822) Resolving deltas: 100% (1452892/1452892), done. [root@f13 kernel]# cd linux-2.6-xen/ [root@f13 linux-2.6-xen]# git checkout -b xen/stable-2.6.32.x origin/xen/stable-2.6.32.x Branch xen/stable-2.6.32.x set up to track remote branch xen/stable-2.6.32.x from origin. Switched to a new branch 'xen/stable-2.6.32.x' [root@f13 linux-2.6-xen]#
Configure the kernel
You can run make menuconfig, and go through the config file to manually activate the relevant Xen options. (Hint: Press the '/' key to bring up a search option, and search for 'xen'.
Alternatively, download a reference config-file for the 2.6.32.x kernel. Also run "oldconfig" to adapt the configuration to current kernel version (if it's different):
# wget -O .config http://pasik.reaktio.net/xen/pv_ops-dom0-debug/config-2.6.32.25-pvops-dom0-xen-stable-x86_64 # make oldconfig
Note the example config-file above is DEBUG-enabled possibly causing big performance hits, so don't use it for performance testing!
Building the kernel
Next, build the kernel.
Note: Replace "4" in "-j4" by the number of physical CPU cores you have to speed up the compilation:
# make clean # make -j4 bzImage && make -j4 modules
After successful compilation install the the kernel modules and the kernel itself. In this example we assume the kernel version is "2.6.32.25":
# make modules_install # depmod -a 2.6.32.25 # cp -a arch/x86/boot/bzImage /boot/vmlinuz-2.6.32.25 # cp -a System.map /boot/System.map-2.6.32.25 # cp -a .config /boot/config-2.6.32.25 # cd /boot # dracut initramfs-2.6.32.25.img 2.6.32.25
Don't worry about the warnings from dracut. Dracut might take a couple of minutes to execute. Example dracut output:
[root@f13 boot]# dracut initramfs-2.6.32.25.img 2.6.32.25 grep: /usr/share/plymouth/themes/.plymouth/.plymouth.plymouth: No such file or directory The default plymouth plugin () doesn't exist [root@f13 boot]#
