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= [[?action=find&find=short+presentation|short presentation]] = <div id="toolbar-top"> [[Linux-VServer]] | [[RecentChanges]] | [http://linux-vserver.org/?action=prefs Preferences] | [http://tavi.sourceforge.net/FormattingRules FormattingRules] </div> ----- </div> <div id="body"> First for those who still haven't heard of the vserver project: It allows you to run linux inside linux: Any distributions inside any distributions. Each virtual server has its own packages, its own services, its own users and is confined to using some IP numbers only and some area(s) of the file system. You can think of them as virtual machines. For many people, virtual server may look like a great toy: Very high geek coolness factor, but not much. It looks cool, but probably not for everyone. '''Wroonnnngggggg!!!!''' Few specs and some explanations 1-Virtual servers are running with the same kernel as the host. Performance are exactly the same as a non virtual server (unlike other VM solutions). 2-Virtual servers have no overhead. There is no special daemons running. A vserver running crond,sshd,httpd and sendmail uses the same resources as a normal linux server. 3-Virtual servers generally share the disk space with the host, so there is no need to pre-allocate disk space for each vserver only to find out later that your disk is full, yet each vserver is only using of tiny portion of their allocated space. 4-A second vserver generally cost 40-100 megs of disk space only. It shares most of the binaries and libraries with the first one. Most of this space is a copy of the RPM database. 5-Vservers are updated independantly even if they share binaries with other vservers. 6-32 bits distributions vservers runs normally on a 64bits linux host, but faster, sometime a lot. 7-You can mix various distributions on the same server all runing at once. http://www.solucorp.qc.ca is a rh7.3 vserver running on a rh7.3 server. We also run FC3 vservers as well as Debian vservers on the same box (A Celeron 500mhz btw). 8-Admin tools work inside a vserver as usual. 9-A cracked vserver can't reach the host server. The host server may be used to investigate safely the cracked server (and fix it), something almost impossible with a typical linux installation. <span id="why-do-you-need-vservers"></span>
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