A host computer can have several virtual servers running on it. The number one reason is usually because you want to run packages that are yet not standard shared hosting. Another reason could be that you need a solution that is more scalable than the shared hosting solution. Also, perhaps you're not yet at the point where you need a dedicated solution, or collocated hosting is not an option yet. Most
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Dropbear and openssh. SSH Dropbear / Openssh: