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| Hosting > VPS > Linux VPS > Administration > | Sunday, October 12, 2008 | ||||||||||||||||||||||||||||||||||||||||||||||||||||
Linux VPS3 OverviewLinux (sometimes referred to as GNU/Linux or a Linux-based GNU system) is a UNIX-like operating system. Linux is distributed under the terms of the GNU General Public License as published by the Free Software Foundation. Your private server utilizes RHEL, a widely implemented corporate Linux standard. RHEL is based on open standards and is derived from the Red Hat-sponsored and the community-supported, open source Fedora project named. To locate more information about RHEL and the Fedora project, refer to the following Web sites: The RHEL operating system provides support for GNU Compiler Collection (GCC) and the Red Hat Package Manager (RPM). The package manager is described in the section labeled "RPM" located on page 4 and the compiler is described in the section named "GCC" located on page 18. As you perform configuration, administration and trouble-shooting tasks, apply your previous knowledge of open-source software applications. Your Linux VPS provides services in a way that assures the account functions as a stand-alone server, independent from any other account. The account supports specific processes, applications, users, and files. Utilize root access and grant access to any ports. The account supports multiple users and provides you with access to all logs. Data backups, server security and software updates are updated by means of server software updates which often do not require your intervention. Your private server is a hosting environment which provides you with an approximation of your own virtual machine. Keep in mind that although your private server shares remote hardware with other accounts, your private server does not share software. Each account has its own complete directory structure and set of dedicated applications such as Web server and mail server. Your private srever can be remotely rebooted without affecting any other accounts served by the physical hardware. Your private server is compliant with server monitoring software applications. Configure your private server to support multiple users with shell, Web, FTP and/or email privileges. The RHEL operating system provides a compatible base for operating- system level server virtualization, skel package, and copy-on-write optimization. Your Linux VPS also supports your access to the Linux Command Library (or manual pages) which provides information about the full command set supported by your private server. Manual pages also provide information about system calls, library calls, special files, as well as file formats and conventions. Following are examples of how the features of your private server can be utilized:
Operating-system Level Server VirtualizationYour Linux VPS behaves as a stand-alone Linux server. It has standard startup scripts and software from multiple vendors can operate in the account without modification. Change any configuration file and install additional software. The file system, the processes, Interprocess Communication (IPC) mechanisms, and sysct1 variables are always fully isolated from any other account. Processes which belong to your private server are scheduled for execution on all available processing power.Your VPS includes its own IP address. The network traffic of your private server is isolated from all other accounts. Traffic snooping is not possible. Manipulate your VPS routing table using advanced routing features. Resource management controls the amount of resources available to your VPS. This enables the quality of service to meet the service level agreements associated with your private server. The operating system-level server virtualization also provides performance and resource isolation which protects your VPS from denial of service attacks. A technician pre-configures each Linux VPS account with the following core services residing on the virtual private server account:
By default your new Linux VPS account is pre-configured as a Web and email server. Your account begins as a copy-on-write (COW) image of a technician-tested, basic RHEL installation. However, you can configure your Linux VPS account to provide additional services Copy-on-WriteLinux VPS technology utilizes a COW file system. The system is based on a COW image of a technician-tested, basic RHEL installation. Even as you and system administrators update and customize the account, your account continues to use central files maintained by our technicians. This ensures that your account has relatively unfettered access to as many system resources such as Random Access Memory (RAM). Over time, files which are unique to your own account and configuration might grow in size to suit your needs. However, nearly all of the files which ensure clean, speedy operations for your account will not do so. Further, system administrators will continue to easily and quickly manage updates to core services.RPMYour Linux VPS supports RPM, an open packaging system for Linux and UNIX systems distributed under the terms of the GPL. The package maintains a database of installed packages and their files. This enables you to maintain and upgrade your private server configurations and customizations with minimal risk of losing them as you do so. |
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