Difference between revisions of "Creating a CentOS 5.0 Template"
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# Install a system (virtual or physical) with the default CentOS installation that you wish to package. This could be a minimal distro or the default distro or even something custom. | # Install a system (virtual or physical) with the default CentOS installation that you wish to package. This could be a minimal distro or the default distro or even something custom. | ||
| + | ## It's generally quicker to bootstrap a CentOS system on another yum/rpm-based, or Debian based system by following the instructions in [http://faiwiki.informatik.uni-koeln.de/index.php/FAI_multi-distribution#bootstrapping_the_base_images__for_other_distributions] | ||
# Once the OS has been installed, you need to '''tar''' the contents of the OS. | # Once the OS has been installed, you need to '''tar''' the contents of the OS. | ||
## First, create a file called '''/tmp/exclude''' and add the following lines to it: | ## First, create a file called '''/tmp/exclude''' and add the following lines to it: | ||
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#: /sys/* | #: /sys/* | ||
#: /usr/src/* | #: /usr/src/* | ||
| − | ## Now, tar the OS file up by typing: '''tar | + | ## Now, tar the OS file up by typing: '''tar --numeric-owner -czvf /tmp/centos-5.0-<ARCH>-<DISTRO>-image.tar.gz -X /tmp/exclude /''' where <'''ARCH'''> represents the system architecture ('''i386''' or |
#: '''x86_64''') and <'''DISTRO'''> represents the distribution (default, minimal, etc.). | #: '''x86_64''') and <'''DISTRO'''> represents the distribution (default, minimal, etc.). | ||
## Now transfer the file over to the OpenVZ server into '''/vz/template/cache''' folder. | ## Now transfer the file over to the OpenVZ server into '''/vz/template/cache''' folder. | ||
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#: and copying the '''/etc/vz/conf/ve-vps.basic.conf-sample''' to '''/etc/vz/conf/50.conf'''. | #: and copying the '''/etc/vz/conf/ve-vps.basic.conf-sample''' to '''/etc/vz/conf/50.conf'''. | ||
#: '''NOTE''': 50 is the CTID for the container. You can choose any unused CTID on the OpenVZ server. | #: '''NOTE''': 50 is the CTID for the container. You can choose any unused CTID on the OpenVZ server. | ||
| − | # Now create a new folder called '''/vz/template/centos/5 | + | # Now create a new folder called '''/vz/template/centos/5/<ARCH>/config''' again where |
#: <'''ARCH'''> represents the system architecture. | #: <'''ARCH'''> represents the system architecture. | ||
# Create a file in the folder called rpm and add the following line: | # Create a file in the folder called rpm and add the following line: | ||
| Line 27: | Line 28: | ||
#: [main] | #: [main] | ||
#: | #: | ||
| − | #: cachedir=/vz/template/centos/5 | + | #: cachedir=/vz/template/centos/5/<ARCH>/yum-cache/ |
#: | #: | ||
#: reposdir=/dev/null | #: reposdir=/dev/null | ||
| Line 51: | Line 52: | ||
#: | #: | ||
#: gpgcheck=1 | #: gpgcheck=1 | ||
| − | # Copy '''/etc/vz/dists/centos-4.conf''' to '''/etc/vz/dists/centos-5. | + | # Copy '''/etc/vz/dists/centos-4.conf''' to '''/etc/vz/dists/centos-5.conf'''. |
| − | # Change to the '''/vz/private/50''' folder and then run the command '''gunzip –dc /vz/template/cache/centos-5 | + | # Copy '''/vz/template/centos/4/i386/config/minimal.list''' to ''' /vz/template/centos/5/i386/config/minimal.list'''. |
| + | # Change to the '''/vz/private/50''' folder and then run the command '''gunzip –dc /vz/template/cache/centos-5-<ARCH>-<DISTRO>-image.tar.gz | tar –xvf –''' to unpack the base image to the folder. | ||
# Make sure you are in the '''/vz/private/50''' folder. | # Make sure you are in the '''/vz/private/50''' folder. | ||
# Edit '''etc/shadow''' and remove the replace the '''root''' password with !! instead of the hashed value. | # Edit '''etc/shadow''' and remove the replace the '''root''' password with !! instead of the hashed value. | ||
# Edit the '''etc/inittab''' file and comment out the lines that respawn '''/sbin/mingetty''' on '''tty1''' through '''tty6'''. Just put a # at the beginning of the line. | # Edit the '''etc/inittab''' file and comment out the lines that respawn '''/sbin/mingetty''' on '''tty1''' through '''tty6'''. Just put a # at the beginning of the line. | ||
| − | # Remove the '''etc/mtab''' file and then create a symbolic link by typing '''ln | + | # Remove the '''etc/mtab''' file and then create a symbolic link by typing '''ln -s /proc/mounts etc/mtab'''. |
# Remove all of the lines from '''etc/fstab''' except for the line that mounts '''/dev/pts'''. | # Remove all of the lines from '''etc/fstab''' except for the line that mounts '''/dev/pts'''. | ||
# Edit '''etc/rc.d/rc.sysinit''' and comment out the line that starts '''/sbin/start_udev''' by placing a # at the beginning of the line. | # Edit '''etc/rc.d/rc.sysinit''' and comment out the line that starts '''/sbin/start_udev''' by placing a # at the beginning of the line. | ||
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#: mknod dev/ptmx c 5 2 | #: mknod dev/ptmx c 5 2 | ||
#: mkdir dev/pts | #: mkdir dev/pts | ||
| − | #: /sbin/MAKEDEV –d /vz/private/50/dev ttyp ptyp | + | #: /sbin/MAKEDEV –d/vz/private/50/dev ttyp ptyp |
#: mknod dev/null c 1 3 | #: mknod dev/null c 1 3 | ||
| + | #: mknod -m 644 dev/random c 1 8 | ||
#: mknod dev/urandom c 1 9 | #: mknod dev/urandom c 1 9 | ||
# Create the '''var/lock/rpm''' folder. | # Create the '''var/lock/rpm''' folder. | ||
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#: blacklist net-pf-10 | #: blacklist net-pf-10 | ||
# Disable any physical NICs by modifying the '''etc/sysconfig/network-scripts/ifcfg-ethX''' files (where '''X''' is the interface number starting from '''0''') and setting '''ONBOOT''' to '''no'''. | # Disable any physical NICs by modifying the '''etc/sysconfig/network-scripts/ifcfg-ethX''' files (where '''X''' is the interface number starting from '''0''') and setting '''ONBOOT''' to '''no'''. | ||
| + | # Check etc/sysconfig/init to see if PROMPT=yes, and then change to no. Otherwise when startup init script rc will enter interactive mode and wait there forever | ||
| + | |||
# Now you’re ready to start the template. Type '''vzctl start 50''' and wait for it to start. | # Now you’re ready to start the template. Type '''vzctl start 50''' and wait for it to start. | ||
# You can install additional packages into the container by typing '''vzyum 50 install <package>''' at the prompt where <'''package'''> represents the name of the software package you wish to install. | # You can install additional packages into the container by typing '''vzyum 50 install <package>''' at the prompt where <'''package'''> represents the name of the software package you wish to install. | ||
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# Exit the container by typing '''exit''' at the prompt. | # Exit the container by typing '''exit''' at the prompt. | ||
# Stop the container by typing '''vzctl stop 50'''. | # Stop the container by typing '''vzctl stop 50'''. | ||
| − | # Finally, package up the new template by typing '''tar –czvf /vz/template/cache/centos-5 | + | # Make sure you are in the '''/vz/private/50''' folder. |
| + | # Finally, package up the new template by typing '''tar –czvf /vz/template/cache/centos-5-<ARCH>-<DISTRO>.tar.gz ./'''. | ||
# The template is ready for use. | # The template is ready for use. | ||
Latest revision as of 04:54, 7 August 2011
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- Install a system (virtual or physical) with the default CentOS installation that you wish to package. This could be a minimal distro or the default distro or even something custom.
- It's generally quicker to bootstrap a CentOS system on another yum/rpm-based, or Debian based system by following the instructions in [1]
- Once the OS has been installed, you need to tar the contents of the OS.
- First, create a file called /tmp/exclude and add the following lines to it:
- .bash_history
- lost+found
- /dev/*
- /mnt/*
- /tmp/*
- /proc/*
- /sys/*
- /usr/src/*
- Now, tar the OS file up by typing: tar --numeric-owner -czvf /tmp/centos-5.0-<ARCH>-<DISTRO>-image.tar.gz -X /tmp/exclude / where <ARCH> represents the system architecture (i386 or
- x86_64) and <DISTRO> represents the distribution (default, minimal, etc.).
- Now transfer the file over to the OpenVZ server into /vz/template/cache folder.
- On the OpenVZ server create a “dummy” container by creating a folder called /vz/private/50
- and copying the /etc/vz/conf/ve-vps.basic.conf-sample to /etc/vz/conf/50.conf.
- NOTE: 50 is the CTID for the container. You can choose any unused CTID on the OpenVZ server.
- Now create a new folder called /vz/template/centos/5/<ARCH>/config again where
- <ARCH> represents the system architecture.
- Create a file in the folder called rpm and add the following line:
- 43
- Create a file called yum.conf in the folder and add the following lines:
- [main]
- cachedir=/vz/template/centos/5/<ARCH>/yum-cache/
- reposdir=/dev/null
- installonlypkgs=
- [centos5-base]
- name=CentOS 5 - <ARCH> - Base
- baseurl=http://mirror.centos.org/centos/5/os/<ARCH>/
- enabled=1
- gpgcheck=1
- [centos5-updates-released]
- name=CentOS 5 - <ARCH> - Released Updates
- baseurl=http://mirror.centos.org/centos/5/updates/<ARCH>/
- enabled=1
- gpgcheck=1
- Copy /etc/vz/dists/centos-4.conf to /etc/vz/dists/centos-5.conf.
- Copy /vz/template/centos/4/i386/config/minimal.list to /vz/template/centos/5/i386/config/minimal.list.
- Change to the /vz/private/50 folder and then run the command gunzip –dc /vz/template/cache/centos-5-<ARCH>-<DISTRO>-image.tar.gz | tar –xvf – to unpack the base image to the folder.
- Make sure you are in the /vz/private/50 folder.
- Edit etc/shadow and remove the replace the root password with !! instead of the hashed value.
- Edit the etc/inittab file and comment out the lines that respawn /sbin/mingetty on tty1 through tty6. Just put a # at the beginning of the line.
- Remove the etc/mtab file and then create a symbolic link by typing ln -s /proc/mounts etc/mtab.
- Remove all of the lines from etc/fstab except for the line that mounts /dev/pts.
- Edit etc/rc.d/rc.sysinit and comment out the line that starts /sbin/start_udev by placing a # at the beginning of the line.
- Now create device nodes by typing:
- mknod dev/ptmx c 5 2
- mkdir dev/pts
- /sbin/MAKEDEV –d/vz/private/50/dev ttyp ptyp
- mknod dev/null c 1 3
- mknod -m 644 dev/random c 1 8
- mknod dev/urandom c 1 9
- Create the var/lock/rpm folder.
- If you wish to disable IPv6, do the following:
- Edit etc/sysconfig/network and set NETWORKING_IPV6 to no.
- Add the following lines to etc/modprobe.d/blacklist:
- blacklist ipv6
- blacklist net-pf-10
- Disable any physical NICs by modifying the etc/sysconfig/network-scripts/ifcfg-ethX files (where X is the interface number starting from 0) and setting ONBOOT to no.
- Check etc/sysconfig/init to see if PROMPT=yes, and then change to no. Otherwise when startup init script rc will enter interactive mode and wait there forever
- Now you’re ready to start the template. Type vzctl start 50 and wait for it to start.
- You can install additional packages into the container by typing vzyum 50 install <package> at the prompt where <package> represents the name of the software package you wish to install.
- Finally, you should turn off unnecessary services.
- Enter the container by typing vzctl enter 50.
- View the services that are set to run at startup by typing chkconfig --list | grep 5:on.
- Disable any unwanted service by typing chkconfig --levels 2345 <service> off where <service> represents the service to disable.
- Services that you can (and should) turn off without harm are acpid, apmd, kudzu, and microcode_ctl.
- Exit the container by typing exit at the prompt.
- Stop the container by typing vzctl stop 50.
- Make sure you are in the /vz/private/50 folder.
- Finally, package up the new template by typing tar –czvf /vz/template/cache/centos-5-<ARCH>-<DISTRO>.tar.gz ./.
- The template is ready for use.
