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Figure 5: Fedora Core Installation - Disabling Firewall and SELinux
#net.ipv4.tcp_ecn = 0
* vzpkg: this package is used to work with OpenVZ templates.
==== Software Compatibility ====
The Hardware Node should run either Red Hat Enterprise Linux 3 6 or 45, or Fedora Core 3 CentOS 6 or 45, or CentOS 3.4 Scientific Linux 6 or 45. The detailed instructions on installing these operating systems for the best performance of OpenVZ are provided in the next sections.
This requirement does not restrict the ability of OpenVZ to provide other Linux versions as an operating system for Virtual Private Servers. The Linux distribution installed in a Virtual Private Server may differ from that of the host OS.
! Partition !! Description !! Typical size
|-
| / || Root partition containing all Hardware Node operating system files | 2–4 4–12 Gb
|-
| swap || Paging partition for the Linux operating system || 2 times RAMor RAM + 2GB depending on available HD space
|-
| /vz || Partition to host OpenVZ templates and Virtual Private Servers || all the remaining space on the hard disk
|}
Many of the historical specifications for partitioning are outdated in an age where all hard drives are well above 20GB. So all minimums can be increased without any impact if you have plenty of drive space. It is suggested to use the ext3 or ext4 file system for the /vz partition. This partition is used for holding all data of the Virtual Private Servers existing on the Hardware Node. Allocate as much disk space as possible to this partition. It is not recommended to use the reiserfs file system as it is proved to be less stable than the ext3, and stability is of paramount importance for OpenVZ-based computers.
The root partition will host the operating system files. The Fresh CentOS 6 install with basic server set of Fedora Core 4 occupies packages + OpenVZ kernel can occupy up to approximately 1 2 GB of disk space, so 1 4 GB is the a good minimal size of the root partition. The If you have plenty of drive space and think you may add additional software to the Node such as monitoring software then consider using more. Historically, the recommended size of the swap partition shall be has been two times the size of physical RAM installed on the Hardware Node.The figure below presents a system Now, with minimum server RAM often above 2GB a 12 GB SCSI hard drive. Figure 4: Fedora Core Installation - Disk DruidPlease keep in mind that Virtual Private Server private areas, containing all data of the Virtual Private Servers shall reside on this single /vz disk partition together with all the templates installedmore reasonable specification might be RAM + 2GB if RAM is above 2GB and HD space is limited.
=== Finishing OS Installation ===
On the Firewall Configuration screen, choose No firewall. Option Enable SELinux should be set to Disabled.
After finishing the installation and rebooting your computer, you are ready to install OpenVZ on your system.
First of all, you should download the kernel binary RPM from http://openvz.org/download/kernel/. You need only one kernel RPM, so please choose the appropriate kernel binary depending on your hardware:
if you use Red Hat Enterprise 5, or Centos 5, or Scientific Linux 5:
* If there is more than one CPU available on your Hardware Node (or a CPU with hyperthreading), select the vzkernel-smp RPM.
* If there is more than 4 Gb of RAM available, select the vzkernel-enterprise RPM.
* Otherwise, select the uniprocessor kernel RPM (vzkernel-version).
if you use Red Hat Enterprise 6, or Centos 6, or Scientific Linux 6:
*select the uniprocessor kernel RPM (vzkernel-version).
Next, you shall install the kernel RPM of your choice on your Hardware Node by issuing the following command:
kernel.sysrq = 1
# TCP Explict Congestion Notification
# we do not want all our interfaces to send redirects
net.ipv4.conf.default.send_redirects = 1
* vzctl: this package is used to perform different tasks on the OpenVZ Virtual Private Servers (create, destroy, start, stop, set parameters etc.).
* vzquota: this package is used to manage the VPS quotas.
You can download the corresponding binary RPMs from http://openvz.org/download/utils/.
On the next step, you should install these utilities by using the following command:
# rpm –Uhv vzctl*.rpm vzquota*.rpm vzpkg*.rpm
{{Note|During the packages installation, you may be presented with a message telling you that rpm has found unresolved dependencies. In this case you have to resolve these dependencies first and then repeat the installation.}}