|24-11-2009, 12:00 PM||#1|
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Hướng dẫn cài đặt OpenVZ!
This document briefly describes the steps needed to install OpenVZ on your (RPM based) machine. For Debian based systems see Installation on Debian.
Hướng dẫn cài đặt OpenVZ
OpenVZ consists of a kernel, user-level tools, and container templates. This guide tells how to install the kernel and the tools.
This guide assumes you are running recent release of Fedora Core (like FC5) or RHEL/CentOS 4. Currently, OpenVZ kernel tries to support the same hardware that Red Hat kernels support. For full hardware compatibility list,
It is recommended to use a separate partition for container's private directories (by default /vz/private/<veid>). The reason why you should do so is that if you wish to use OpenVZ per-container disk quota, you won't be able to use usual Linux disk quotas on the same partition. Bear in mind, that per-container quota in this context includes not only pure per-container quota, but also usual Linux disk quota used in containers, not on HN.
At least try to avoid using the root partition for containers, because the root user of a container will be able to overcome the 5% disk space barrier in some situations. This way the HN root partition can be completely filled and it will break the system.
OpenVZ per-container disk quota is supported only for ext2/ext3 filesystems. So use one of these filesystems (ext3 is recommended) if you need per-container disk quota.
rpm or yum?
In case you have yum utility available on your system, you may want to use it effectively to install and update OpenVZ packages. In case you don't have yum, or don't want to use it, you can use plain old rpm. Instructions for both rpm and yum are provided below.
If you want to use yum, you should set up OpenVZ yum repository first.
Download openvz.repo file and put it to your /etc/yum.repos.d/ repository. This can be achieved by the following commands, as root:
Note: In case you want to recompile the kernel yourself rather than use the one provided by OpenVZ, see kernel build. First, you need to choose what “flavor” of the kernel you want to install. Please refer to Kernel flavors for more information.
Run the following command
Note: if you need to install x86_64 kernel and yum offers to install both x86_64 and i686 kernels, answer No and specify architecture manually, like this: yum install ovzkernel[-flavor].x86_64. This is fixed in newer yum versions. Using rpm
Get the kernel binary RPM from the Download/kernel page. You only need one kernel RPM so please choose the appropriate one depending on your hardware.
Next, install the kernel RPM you chose:
Note: rpm -U (where -U stands for upgrade) should not be used, otherwise all currently installed kernels will be uninstalled. Configuring the bootloader
In case GRUB is used as the boot loader, it will be configured automatically: lines similar to these will be added to the /boot/grub/grub.conf file:
title Fedora Core (2.6.8-022stab029.1)
kernel /vmlinuz-2.6.8-022stab029.1 ro root=/dev/sda5 quiet rhgb vga=0x31B
Change Fedora Core to OpenVZ (just for clarity reasons, so the OpenVZ kernels will not be mixed up with non-OpenVZ ones). Remove extra arguments from the kernel line, leaving only the root=... parameter. The modifed portion of /etc/grub.conf should look like this:
title OpenVZ (2.6.8-022stab029.1)
kernel /vmlinuz-2.6.8-022stab029.1 ro root=/dev/sda5
Please make sure the following steps are performed before rebooting into OpenVZ kernel.
There are a number of kernel parameters that should be set for OpenVZ to work correctly. These parameters are stored in /etc/sysctl.conf file. Here are the relevant portions of the file; please edit accordingly.
SELinux should be disabled. To that effect, put the following line to
Note: In OpenVZ kernels later than 2.6.8, connection tracking is enabled by default so skip this section. In the old (2.6.8-based) OpenVZ kernels netfilter connection tracking for CT0 is disabled by default. If you have a stateful firewall enabled on the host node (it is there by default on some distributions) you should either disable it, or enable connection tracking for CT0.
To enable conntracks for CT0, add the following line to
Now reboot the machine and choose "OpenVZ" on the boot loader menu. If the OpenVZ kernel has been booted successfully, proceed to installing the user-level tools for OpenVZ. If you are installing on x86_64 CentOS or Fedora system, you may want to continue the setup process using the x86_64 guide.
Installing the utilities
OpenVZ needs some user-level tools installed. Those are:
Download the binary RPMs of these utilities from Download/utils. Install them:
When all the tools are installed, start the OpenVZ subsystem.
As root, execute the following command:
During the next reboot, this script should be executed automatically.
OpenVZ is now set up on your machine. To load OpenVZ kernel by default, edit the default line in the /boot/grub/grub.conf file to point to the OpenVZ kernel. For example, if the OpenVZ kernel is the first kernel mentioned in the file, put it as default 0. See man grub.conf for more details.
From OpenVZ Wiki