ATOL: Virtualization
Marek Grác
xgrac@f i.muni.cz
Red Hat Czech s.r.o. / Faculty of Informatics, Masaryk University
Advanced Topics of Linux Administration
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Advantages
►•  Security
►•   Better utilization of computers (power, CPU, rack space) ►•   Higher availability of services Low-cost solution
► Disadvantages
►•   Performance issues
►•  Virtualization on Linux is new technology
►•  Very difficult to solve issues
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►  No modification are needed in guest OS
►  Total abstraction of underlying physical system
►  HW support: Intel VT (CPU flag vmx), AMD SVM (svm)
►  PAE 111
►  Pentium ll-IV, Celeron, Xeon
►  Duron, Athlon
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►   Requires user modification of guest OS (eg. linux-image-xen)
►   Provides near native performance (j5% ??)
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Virtual CPUs (vcpu)
►  Virtual disks (/dev/xvda)
►  Virtual network interfaces (VNIC), identification by MAC addresses
►  Identification of guests using
►•  domain name (domain-name) - user given ►•   identity (domain-id) - unique, non-persistent ►•   UUID - persistent, assigned at first installation
► Goals:
Create a virtual machine on your computer using kickstart ►•  Setup network connection through your 'real' machine Using a LVM snapshots create a new virtual machine from existing one
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► Themes:
►   Compare VMWare, Xen, KVM, .. . Format:
►•  Short presentation (15-20 minutes; 5-7 slides) ►•   Paper containing comparision (500 words)
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