Each virtual machine needs a disk image containing the operating system. We have three virtual machines so we need three disk images. However, just create one image and then make copies of the other two. Creating partitions and filesystem on diskAn operating system generally needs one root partition and one swap partition. We practice on … Đọc tiếp Building a fault-tolerant firewall system with virtual machines: Creating disk image

The tap network backend is the most appropriate configuration option in qemu for us to create network interfaces for virtual machines because virtual ethernet interfaces created in such a way are considered as normal ethernet devices without any restriction. We also need bridge devices to connect the interfaces in the networks.By design, a bridge device … Đọc tiếp Building a fault-tolerant firewall system with virtual machines: Creating bridge devices and tap interfaces

Combining netfilter connection tracking tool conntrackd with HA (High Availability) service using keepalived we can build a fault tolerant firewall system. With qemu and spice, the system is built based on virtual machines that are almost as friendly as the physical ones. Users can use virtual machines remotely via the spice protocol and can perform … Đọc tiếp Building a fault-tolerant firewall system with virtual machines: Introduction