Last two weeks were very busy time for me. While working daily job, I attended RHEV class and took ‘Red Hat Enterprise Virtualization’ exam (EX318) and ‘System Monitoring and Performance Tuning’ exam (EX442). Finally, I’ve got RHCA (Red Hat Certified Architect)!!!

In my opinion, template is the most useful feature in virtualization technology. After creating one fully installed VM, you can create several temporary VMs from the original without spend lots of hours or lots of disk space. In LVM environment, you can use ‘snapshot’ feature of lvcreate command. But, LVM volume is not easy to [...]

When you run KVM-based virtual machine, you can specify ‘-startdate’ option. What format we can use and what actions are happening inside the qemu-kvm. Options are checked in main() function in vl.c. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 [...]

If you are going to run virtualized host as a web server or some services for the clients, the systems should be accessible from the outside. Unfortunately, the default network configuration in KVM is NAT (Network Address Translation). It is good for some VMs who will co-work with other VMs, but for the server, it [...]