Editing Creating OpenVZ LiveCD based on Centos 4.4
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This part contains detailed description of LiveCD creation. I've removed the output of some | This part contains detailed description of LiveCD creation. I've removed the output of some | ||
commands in order to simplify the reading. | commands in order to simplify the reading. | ||
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=== Creating booted LiveCD root filesystem === | === Creating booted LiveCD root filesystem === | ||
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# cp mksquashfs /usr/bin/ | # cp mksquashfs /usr/bin/ | ||
− | # cd | + | # cd ~/workbench/ |
# wget http://belnet.dl.sourceforge.net/sourceforge/squashfs/squashfs3.2-r2.tar.gz | # wget http://belnet.dl.sourceforge.net/sourceforge/squashfs/squashfs3.2-r2.tar.gz | ||
# tar xzf squashfs3.2-r2.tar.gz | # tar xzf squashfs3.2-r2.tar.gz | ||
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cc unsquashfs.o -lz -o unsquashfs | cc unsquashfs.o -lz -o unsquashfs | ||
# cp unsquashfs /usr/bin/ | # cp unsquashfs /usr/bin/ | ||
− | # cd | + | # cd ~/workbench |
</pre> | </pre> | ||
Well, having the intruments in hand, why not extract the images? Create a directory, called <tt>livecd-root</tt>, | Well, having the intruments in hand, why not extract the images? Create a directory, called <tt>livecd-root</tt>, | ||
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# mkdir livecd-root | # mkdir livecd-root | ||
− | # | + | # unsquashfs ovz-livecd/base/bin.mo |
− | + | # mv squashfs-root/bin/ livecd-root/ | |
− | + | # rm -rf squashfs-root | |
− | + | ||
− | + | # unsquashfs ovz-livecd/base/etc.mo | |
− | + | # mv squashfs-root/etc/ livecd-root/ | |
+ | # rm -rf squashfs-root | ||
+ | |||
+ | # unsquashfs ovz-livecd/base/lib.mo | ||
+ | # mv squashfs-root/lib/ livecd-root/ | ||
+ | # rm -rf squashfs-root | ||
+ | |||
+ | # unsquashfs ovz-livecd/base/root.mo | ||
+ | # mv squashfs-root/root/ livecd-root/ | ||
+ | # rm -rf squashfs-root | ||
+ | |||
+ | # unsquashfs ovz-livecd/base/sbin.mo | ||
+ | # mv squashfs-root/sbin/ livecd-root/ | ||
+ | # rm -rf squashfs-root | ||
− | + | # unsquashfs ovz-livecd/base/usr.mo # this action takes some time, be patient ;) | |
+ | # mv squashfs-root/usr/ livecd-root/ | ||
+ | # rm -rf squashfs-root | ||
+ | # unsquashfs ovz-livecd/base/var.mo | ||
+ | # mv squashfs-root/var/ livecd-root/ | ||
+ | # rm -rf squashfs-root | ||
+ | </pre> | ||
Yet we have nearly complete root filesystem of '''booted''' LiveCD in <tt>livecd-root</tt> directory. However some things | Yet we have nearly complete root filesystem of '''booted''' LiveCD in <tt>livecd-root</tt> directory. However some things | ||
are missing, and I guess you know what are they: <tt>/dev</tt>, <tt>/proc</tt>, <tt>/sys</tt>, <tt>/tmp</tt> and <tt>/boot</tt> directories. We need them, because some tools (<tt>rpm</tt>, <tt>bash</tt>, ...) will not work without them in chrooted environment later. | are missing, and I guess you know what are they: <tt>/dev</tt>, <tt>/proc</tt>, <tt>/sys</tt>, <tt>/tmp</tt> and <tt>/boot</tt> directories. We need them, because some tools (<tt>rpm</tt>, <tt>bash</tt>, ...) will not work without them in chrooted environment later. | ||
<pre> | <pre> | ||
− | # | + | # mkdir root/dev |
− | + | # cp -a /dev/* root/dev | |
− | # cp -a /dev/* dev | + | # mkdir root/proc |
− | # mkdir proc | + | # mount -t proc proc root/proc/ |
− | # mount -t proc proc proc/ | + | # mkdir root/sys |
− | # mkdir sys | + | # mount -t sysfs sysfs root/sys/ |
− | # mount -t sysfs sysfs sys/ | + | # mkdir root/tmp |
− | # mkdir tmp | + | # mkdir root/boot |
− | # mkdir boot | ||
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</pre> | </pre> | ||
− | That's it. We have ''' | + | That's it. We have '''booted''' LiveCD root filesystem in <tt>livecd-root</tt> directory. |
Now we can <tt>chroot</tt> in this directory and install all needed packages. But what | Now we can <tt>chroot</tt> in this directory and install all needed packages. But what | ||
packages do we need? | packages do we need? | ||
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OpenVZ LiveCD supports several kernels. So, the actions mentioned above should be accomplished to all kernels, | OpenVZ LiveCD supports several kernels. So, the actions mentioned above should be accomplished to all kernels, | ||
that you need on LiveCD. In this article I skip the description of building RPMS for all kernels. All description | that you need on LiveCD. In this article I skip the description of building RPMS for all kernels. All description | ||
− | below are based on <tt>028stab035</tt> kernel, that has been just build above | + | below are based on <tt>028stab035</tt> kernel, that has been just build above. |
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=== Unionfs kernel module === | === Unionfs kernel module === | ||
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<tt>tetex</tt>, <tt>latex</tt>, <tt>k3b</tt> and printing related packages: | <tt>tetex</tt>, <tt>latex</tt>, <tt>k3b</tt> and printing related packages: | ||
<pre> | <pre> | ||
− | # cp -r to_booted_livecd/ | + | # cp -r to_booted_livecd/ root/tmp/ |
− | # chroot | + | # chroot root/ |
# rpm -e lksctp-tools-1.0.2-6.4E.1.i386 | # rpm -e lksctp-tools-1.0.2-6.4E.1.i386 | ||
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Clean it: | Clean it: | ||
<pre> | <pre> | ||
− | # rm | + | # rm root/root/.bash_history |
</pre> | </pre> | ||
Here we have to make one step to workaround [[Checkpointing and live migration]] problem. The thing is that at the moment | Here we have to make one step to workaround [[Checkpointing and live migration]] problem. The thing is that at the moment | ||
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on this directory: | on this directory: | ||
<pre> | <pre> | ||
− | mkdir | + | mkdir root/vz/private/ |
</pre> | </pre> | ||
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'''Booted''' LiveCD filesystem is ready, congratulations! | '''Booted''' LiveCD filesystem is ready, congratulations! | ||
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<pre> | <pre> | ||
# rm -f ovz-livecd/base/*.mo | # rm -f ovz-livecd/base/*.mo | ||
− | # | + | # mksquashfs root/lib/ ovz-livecd/base/bin.mo -keep-as-directory |
− | + | # mksquashfs root/etc/ ovz-livecd/base/etc.mo -keep-as-directory | |
− | + | # mksquashfs root/lib/ ovz-livecd/base/lib.mo -keep-as-directory | |
+ | # mksquashfs root/root/ ovz-livecd/base/root.mo -keep-as-directory | ||
+ | # mksquashfs root/sbin/ ovz-livecd/base/sbin.mo -keep-as-directory | ||
+ | # mksquashfs root/usr/ ovz-livecd/base/usr.mo -keep-as-directory # it can take long... | ||
+ | # mksquashfs root/var/ ovz-livecd/base/var.mo -keep-as-directory | ||
+ | # mksquashfs root/vz/ ovz-livecd/base/vz.mo -keep-as-directory | ||
</pre> | </pre> | ||
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than 8 characters) to kernel image, otherwise <tt>isolinux</tt> will not see it. | than 8 characters) to kernel image, otherwise <tt>isolinux</tt> will not see it. | ||
<pre> | <pre> | ||
− | # cp | + | # cp root/boot/vmlinuz-2.6.18-ovz028stab035.1-smp ovz-livecd/boot/ovz18 |
</pre> | </pre> | ||
Modify initrd image. More precisely, we need to add OpenVZ kernel modules there | Modify initrd image. More precisely, we need to add OpenVZ kernel modules there | ||
− | and apply small | + | and apply small patch to <tt>liblinuxlive</tt> file. |
− | + | Mount initrd: | |
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<pre> | <pre> | ||
# mkdir initrd.d | # mkdir initrd.d | ||
− | # cp ovz-livecd/boot/initrd.gz initrd.d/ | + | # cp ovz-livecd/boot/initrd.gz initrd.d/ |
# cd initrd.d/ | # cd initrd.d/ | ||
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# mkdir mount | # mkdir mount | ||
+ | # gunzip initrd.gz | ||
# mount -o loop initrd mount/ | # mount -o loop initrd mount/ | ||
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</pre> | </pre> | ||
Copy modules to initrd: | Copy modules to initrd: | ||
<pre> | <pre> | ||
− | # cp -r ../ | + | # cp -r ../root/lib/modules/2.6.18-ovz028stab035.1-smp/ mount/lib/modules/ |
# rm -rf mount/lib/modules/2.6.18-ovz028stab035.1-smp/build # we don't neet it on initrd image | # rm -rf mount/lib/modules/2.6.18-ovz028stab035.1-smp/build # we don't neet it on initrd image | ||
</pre> | </pre> | ||
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initrd image, that goes with Centos 4.4 LiveCD doesn't load cdrom kernel modules. | initrd image, that goes with Centos 4.4 LiveCD doesn't load cdrom kernel modules. | ||
It works well for CentOS kernel, because cdrom support is built-in there. | It works well for CentOS kernel, because cdrom support is built-in there. | ||
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# umount mount/ | # umount mount/ | ||
# gzip initrd | # gzip initrd | ||
− | # cp initrd.gz ../ovz-livecd/boot/initrd.gz | + | # /bin/cp initrd.gz ../ovz-livecd/boot/initrd.gz |
# cd .. | # cd .. | ||
</pre> | </pre> | ||
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+label ovz18 | +label ovz18 | ||
+kernel boot/ovz18 | +kernel boot/ovz18 | ||
− | +append max_loop=32 vga=791 initrd=boot/initrd.gz init=linuxrc load_ramdisk=1 prompt_ramdisk=0 ramdisk_size= | + | +append max_loop=32 vga=791 initrd=boot/initrd.gz init=linuxrc load_ramdisk=1 prompt_ramdisk=0 ramdisk_size=40000 root=/dev/ram0 rw rhgb quiet |
+ | + | ||
label memtest | label memtest | ||
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</pre> | </pre> | ||
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=== Creating ISO === | === Creating ISO === | ||
− | Centos 4.4 LiveCD creators were very gentle and have placed | + | Centos 4.4 LiveCD creators were very gentle and have placed make_iso.sh script on CD. |
Using this script, it is very easy to create iso: | Using this script, it is very easy to create iso: | ||
<pre> | <pre> | ||
− | + | ./make_iso.sh ../CentOS-4.4-i386-OpenVZ-LiveCD.iso | |
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</pre> | </pre> | ||
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</pre> | </pre> | ||
command line options. It will help you to diagnose the problem more precisely. | command line options. It will help you to diagnose the problem more precisely. | ||
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== External Links == | == External Links == | ||
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* [http://squashfs.sourceforge.net/ squashfs website] | * [http://squashfs.sourceforge.net/ squashfs website] | ||
* [http://www.filesystems.org/project-unionfs.html uninonfs official homepage] | * [http://www.filesystems.org/project-unionfs.html uninonfs official homepage] | ||
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