Virtuozzo is a proprietary operating system virtualization product produced by SWsoft, Inc. A version that supports Linux has been available since 2001. Virtuozzo creates multiple, isolated virtual environments (VEs, otherwise known as Virtual Private Servers , or VPS) on a single physical server . This allows the sharing of hardware, systems management effort, and sometimes software licenses among different workloads.
The VPS behaves in most respects as if it were a stand-alone server. Each VPS has its own superuser (Root or Administrator), set of users/groups, IP address(es), processes, files, applications, system libraries and configuration files. The VPS is completely accessible via the network. Due to virtualized network stack, a VPS owner can have his own routing tables and firewall (IP tables) rules.
Each VPS is a separate entity, and from the point of view of its owner it looks like a real physical server. So each VPS has its own:
- Files, system libraries.
- Virtualized /proc and /sys and virtualized locks.
- Each VPS has its own Root Access, as well as other users and groups.
- Standard UNIX per-user and per-group disk quotas.
- Each VPS only sees its own processes (starting from init). PIDs are virtualized, so that the init PID is 1 as it should be.
- Virtual network device, which allows a VPS to have its own IP addresses, as well as a set of netfilter (IP tables) and routing rules.
- IPC objects such as Shared memory, semaphores, messages.
Virtuozzo can support tens to hundreds of Virtual Private Servers (VPS) on a single server due to its use of operating system-level virtualization.
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