Ideal environment:

sda1 - /boot 200MB
sda2 - / 15GB
sda3 - swap
sda4 - reserved for LVM

Check CPU support

# egrep '(vmx|svm)' /proc/cpuinfo

Install clock synchronize

# apt-get install ntp

Install network bridge utility

# apt-get install bridge-utils

Install Xen

# apt-get install xen-linux-system

# apt-get install xen-hypervisor-4.4-amd64

# apt-get install xen-tools

# apt-get install qemu-system-x86

Make kernel for Xen active

find ### BEGIN /etc/grub.d/20_linux_xen ### in /boot/grub/grub.cfg

# vi /boot/grub/grub.cfg

### BEGIN /etc/grub.d/20_linux_xen ###

menuentry 'Debian GNU/Linux, with Xen hypervisor'

Edit /etc/default/grub

# vi /etc/default/grub

GRUB_DEFAULT='Debian GNU/Linux, with Xen hypervisor'

update grub

# update-grub

Restart to activate Xen kernel, check your Xen

# xl list

Name ID Mem VCPUs State Time(s)

Domain-0 0 32167 8 r----- 110.6

Configure bridge network:

Edit /etc/network/interfaces

# vi /etc/network/interfaces

...

auto eth0

iface eth0 inet manual

auto br0

iface br0 inet static

address [ipv4]

netmask [netmask]

network [network]

broadcast [broadcast]

gateway [ipv4gateway]

bridge_ports eth0

bridge_stp on

bridge_maxwait 0

iface br0 inet6 static

address [ipv6]

netmask 64

dns-nameservers [dnsipv6]

gateway [ipv6gatewaay]

autoconf 0

# internal

auto virbr0

iface virbr0 inet static

address 192.168.0.1

netmask 255.255.255.0

broadcast 192.168.0.255

pre-up brctl addbr virbr0

edit /etc/sysctl.conf.d

net.ipv4.ip_forward = 1

net.ipv6.conf.all.forwarding=1

net.bridge.bridge-nf-call-ip6tables = 0

net.bridge.bridge-nf-call-iptables = 0

net.bridge.bridge-nf-call-arptables = 0

Manual adding virbr0

# brctl addbr virbr0

# ifconfig virbr0 192.168.0.1 netmask 255.255.255.0 up

Install and configure dhcp server for domu

Install isc-dhcp-server

# apt-get install isc-dhcp-server

Edit /etc/default/isc-dhcp-server

INTERFACES="virbr0"

Edit /etc/dhcp/dhcpd.conf

subnet 192.168.0.0 netmask 255.255.255.0 {

range 192.168.0.10 192.168.0.50;

option routers 192.168.0.1;

default-lease-time 600;

max-lease-time 7200;

}

Restart dhcp server

# service isc-dhcp-server restart

Configuring xen-tool to create domu images

edit /etc/xen-tools/xen-tools.conf

#Begin by setting the dir = directive to the directory into which the tools are to create the Xen guest image files:

dir = /home/images

#lvm = myvolgroup -> if using LVM (logical volume management)

install-method = debootstrap

debootstrap-cmd = /usr/sbin/debootstrap

size = 4G # Root disk, suffix (G, M, k) required

memory = 512M # Suffix (G, M, k) required

swap = 1G # Suffix (G, M, k) required

fs = ext3 # Default file system for any disk

dist = `jessie` # Default distribution is determined by Dom0's distribution

image = sparse # Specify sparse vs. full disk images (file based images only)

# for static

# gateway = 192.168.1.1

# netmask = 255.255.255.0

# broadcast = 192.168.1.255

dhcp=1

bridge = virbr0

genpass_len = 8

passwd = 1

kernel = /boot/vmlinuz-`uname -r`

initrd = /boot/initrd.img-`uname -r`

pygrub = 1

mirror = http://debian.mirrors.ovh.net/debian

mirror_jessie = http://http.debian.net/debian

ext4_options = noatime,nodiratime,errors=remount-ro

ext3_options = noatime,nodiratime,errors=remount-ro

ext2_options = noatime,nodiratime,errors=remount-ro

xfs_options = defaults

reiserfs_options = defaults

btrfs_options = defaults

output = /etc/xen

extension = .cfg

Creating Xen disk image (loopback image) for Xen guest

Create xen guest with hostname testa, disk 10G, swap 1G, ram/memory 512M, dhcp, vcpu 3, OS Debiean jessie:

# xen-create-image --hostname testa --size=10Gb --swap=1024Mb --memory=512Mb --vcpu=3 --dist=jessie

Can't exec "jessie": No such file or directory at /usr/share/perl5/Xen/Tools/Common.pm line 100, <FILE> line 134.

Use of uninitialized value $output in scalar chomp at /usr/share/perl5/Xen/Tools/Common.pm line 101, <FILE> line 134.

Use of uninitialized value $output in concatenation (.) or string at /usr/share/perl5/Xen/Tools/Common.pm line 104, <FILE> line 134.

General Information

--------------------

Hostname : testa

Distribution : jessie

Mirror : http://debian.mirrors.ovh.net/debian

Partitions : swap 1024Mb (swap)

/ 10Gb (ext3)

Image type : sparse

Memory size : 512Mb

Bootloader : pygrub

Networking Information

----------------------

IP Address : DHCP [MAC: 00:16:3E:73:6F:31]

Creating partition image: /home/vmimages/domains/testa/swap.img

Done

Creating swap on /home/vmimages/domains/testa/swap.img

Done

Creating partition image: /home/vmimages/domains/testa/disk.img

Done

Creating ext3 filesystem on /home/vmimages/domains/testa/disk.img

Done

Installation method: debootstrap

Done

Running hooks

Done

No role scripts were specified. Skipping

Creating Xen configuration file

Done

No role scripts were specified. Skipping

Setting up root password

Enter new UNIX password:

Retype new UNIX password:

passwd: password updated successfully

All done

Logfile produced at:

/var/log/xen-tools/testa.log

Installation Summary

---------------------

Hostname : testa

Distribution : jessie

MAC Address : 00:16:3E:73:6F:31

IP Address(es) : dynamic

RSA Fingerprint : 21:12:bb:c3:ad:34:67:6f:cd:a1:7d:d3:ef:ae:95:f5

Root Password : N/A

This process take approximate 14 minutes.

Run xen guest

To run xen guest

# xl create /etc/xen/testa.cfg -c

xl command

To list dom0 and domu

# xl list

To start domu

# xl create /etc/xen/[config].cfg

To destroy domu

# xl destroy test

To shutdown domu

# xl shutdown test

To show xen information

# xl info

To show cpu use

# xl vcpu-list

Allocate memory and cpu for dom0

To show grub version

# grub-install --version

grub-install (GRUB) 2.02~beta2-22+deb8u1

Allocate memory for dom0 between 1024M and maximum 4048M

for grub1 (/boot/grub/grub.conf or /boot/grub/menu.lst)

title Xen 4.1.0 / pv_ops dom0 kernel 2.6.32.36

root (hd0,0)

kernel /xen-4.0.gz dom0_mem=1024M,max:4048M loglvl=all guest_loglvl=all

module /vmlinuz-2.6.32.36 ro root=/dev/sda2 console=hvc0 earlyprintk=xen nomodeset

module /initrd-2.6.32.36.img
for grub2 (/etc/default/grub)

GRUB_CMDLINE_XEN_DEFAULT="dom0_mem=1024M,max:4048M"

In general you should not assigned less than 4 vCPUs to Dom0

dom0_max_vcpus=4 dom0_vcpus_pin

Routing

Internal to internet

# iptables -t nat -A POSTROUTING -o br0 -j MASQUERADE
# iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

# iptables -A FORWARD -i virbr0 -o br0 -m state --state RELATED,ESTABLISHED -j ACCEPT

# iptables -A FORWARD -i virbr0 -o br0 -j ACCEPT

Internet to internal in port xxx into 192.168.0.100 port yyy

# iptables -A PREROUTING -t nat -i br0 -p tcp --dport xxx -j DNAT --to 192.168.0.100:yyy

# iptables -A FORWARD -p tcp -d 192.168.0.100 --dport yyy -j ACCEPT

Make auto-start domu after boot

Create symlink into folder /etc/xen/auto

# mkdir /etc/xen/auto

# cd /etc/xen/auto/

# ln -s /etc/xen/testa.cfg

edit /etc/xen/testa.cfg

# vi /etc/xen/testa.cfg

on_xend_stop='shutdown'

on_xend_start='start'

Additonal Note

Manual create disk image and swap image

Create 10 G image disk

# fallocate -l 10G /home/vmimages/test1/disk1.img

or using dd (slower)

# dd if=if=/dev/zero of=/xen/test1/disk1.img bs=1gb count=0 seek=10

or using qemu-img

# qemu-img create -f raw -o size=8G /home/vmimages/test1/disk1.raw

Formatting '/home/vmimages/test1/disk1.raw', fmt=raw size=8589934592

Preparing image in ext4 file system

# mkfs -t ext4 /home/vmimages/test1/disk1.img

Create 1 G image swap

# fallocate -l 1G /home/vmimages/test1/swap.img

Preparing image swap

# mkswap /home/vmimages/test1/swap.img

Create partition on image disk

# fdisk /home/vmimages/domains/test/disk.img

Command (m for help): n

Partition type

p primary (0 primary, 0 extended, 4 free)

e extended (container for logical partitions)

Select (default p): p

Partition number (1-4, default 1): 1

First sector (2048-8388607, default 2048):

Last sector, +sectors or +size{K,M,G,T,P} (2048-8388607, default 8388607):

Created a new partition 1 of type 'Linux' and of size 4 GiB.

Command (m for help): a

Selected partition 1

The bootable flag on partition 1 is enabled now.

Command (m for help): p

Disk /home/vmimages/domains/test/disk.img: 4 GiB, 4294967296 bytes, 8388608 sectors

Units: sectors of 1 * 512 = 512 bytes

Sector size (logical/physical): 512 bytes / 512 bytes

I/O size (minimum/optimal): 512 bytes / 512 bytes

Disklabel type: dos

Disk identifier: 0x05824062

Device Boot Start End Sectors Size Id Type

/home/vmimages/domains/test/disk.img1 * 2048 8388607 8386560 4G 83 Linux

Command (m for help): w

The partition table has been altered.

Syncing disks.

# file /home/vmimages/domains/test/disk.img

/home/vmimages/domains/test/disk.img: DOS/MBR boot sector; partition 1 : ID=0x83, active, start-CHS (0x0,32,33), end-CHS (0x2a,42,32), startsector 2048, 8386560 sectors

References:

My Notes

Monday, May 23, 2016

Xen 4.4: How to install in Debian Jessie

edit /etc/xen/testa.cfg

# vi /etc/xen/testa.cfg

on_xend_stop='shutdown'

on_xend_start='start'

Additonal Note

Saturday, May 14, 2016

Centos 7: installing deltarpm (Delta RPMs disabled)

Friday, May 6, 2016

Windows 10: repair "Failed to connect to Windows service. "

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