Reference: http://www.linuxfoundation.org/collaborate/workgroups/networking/netem netem provides Network Emulation functionality for testing protocols by emulating the properties of wide area networks. The current version emulates variable delay, loss, duplication and re-ordering. If you run a current 2.6 distribution, (Fedora, OpenSuse, Gentoo, Debian, Mandriva, Ubuntu), then netem is already enabled in the kernel and a current version of iproute2 is included. The netem kernel component is enabled under: Networking –> Networking Options –> QoS and/or fair queuing –> Network emulator Netem is controlled by the command line tool ‘tc’ which is part of the iproute2 package of tools.

How to update s390x kernel grubby –set-default=/boot/vmlinuz-3.10.0-54.el7.s390x.debug grubby –default-kernel /boot/vmlinuz-3.10.0-54.el7.s390x.debug zipl Using config file ‘/etc/zipl.conf’ Run /lib/s390-tools/zipl_helper.device-mapper /boot Building bootmap in ‘/boot’ Building menu ‘zipl-automatic-menu’ Adding #1: IPL section ‘3.10.0-54.el7.s390x.debug’ (default) Adding #2: IPL section ‘linux’ Preparing boot device: dasdb. Done.

How to convert raw to qcow2 qemu-img convert -c -p -f raw RHEL6.5_x86_64.img -O qcow2 RHEL6.5_x86_64.qcow2

Linux的网络虚拟化是LXC项目中的一个子项目，LXC包括文件系统虚拟化，进程空间虚拟化，用户虚拟化，网络虚拟化，等等 [1]，这里使用LX

There are two methods for PXE boot, one is via BIOS, another one is vis EFI. Please be aware of the differents first. Configuring PXE Boot for BIOS yum install tftp-server dhcpd edit /etc/xinet.d/tftp and change disabled from yes to no change flags to IPv6 if you want to set pxe for IPv6 cp pxelinux.0 /var/lib/tftpboot/pxelinux/ edit /etc/dhcp/dhcpd.conf if you want setup pxe for IPv4 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 option space pxelinux; option pxelinux.