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Virtual servers are interesting because they can provide a higher level of security while potentially reducing the administration task. Common operation such as backup, are shared between all servers. Services such as monitoring may be configured once.

A Linux server can run many services at once with a high level of reliability. As servers are evolving, more and more services are added, often unrelated. Unfortunately there are few details here and there, making the server more complex than it is in reality. When one wants to move one service to another server, it is always a little pain: Some user accounts have to be moved and some configuration files. A lot of hand tweaking.

By installing services in separate virtual servers, it becomes much easier to move services around (just by moving a directory although a big one).

Virtual servers may become a preferred way to install common Linux servers.

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