Set up and Run Linux Xen Dom0 and DomU VMs

ByEric Ma Jul 13, 2013Sep 20, 2020

The Xen solutions including installing and configuring Dom0 and DomU are summarized here.

LVM volumes as backing for DomU’s file system is an appealing solution to Xen VBD. LVM volumes can dynamically grow/shrink and snapshot. These features make it simple and fast to duplicate DomU and adding storage to DomU. LVM backed DomU is recommended.

Dom0 installation and configuration

Installing Xen (Domain-0) on Fedora 17

Setting up Stable Xen Dom0 with Fedora: Xen 3.4.3 with Xenified Linux Kernel 2.6.32.13 in Fedora 12

DomU installation and configuration

Installing Fedora 17 Domain-U on Xen with PXE Booting.

LVM backed Xen DomU is quite stable with high performance that uses unmodified Fedora pv_ops kernel:

Setting Up LVM Backed Xen DomU

Setting up Stable Xen DomU with Fedora: Unmodified Fedora 12 on top of Xenified Fedora 12 Dom0 with Xen

Setting Up Ubuntu DomU on Xen: Use Ubuntu 10.10 on Fedora Xen Dom0

Dom0 management

Dom0’s CPU and memory configuration advises:

Managing Xen Dom0′s CPU and Memory

DomU management

Duplicating LVM Backed Xen DomU

Duplicating and Backing Up LVM Backed Xen DomU from a Remote Server

Create and manage virtual machines on Xen

How to Duplicate Xen DomU Virtual Machines

Automatically backing up Xen File-backed DomU

Unified Xen DomU configuration file

LVM with Xen

A summary of tutorials related to Xen and LVM:[[xen-with-lvm|
]]

Xen with LVM

Problems

Some problems that may happen and their solution:

Problems during Installing Xen Dom0 in Fedora

QA

How to enable iptables on CentOS 7 / Fedora 20?
ByEric Ma Mar 24, 2018Mar 24, 2018

iptables is plain old good. How to enable it after I disable firewalld? First, install the iptables-services package as root: # yum install iptables-services Then, start iptables service as root: # touch /etc/sysconfig/iptables # touch /etc/sysconfig/ip6tables # systemctl start iptables # systemctl start ip6tables # systemctl enable iptables # systemctl enable ip6tables Read more: How…

Read More How to enable iptables on CentOS 7 / Fedora 20?
QA

MySQL at Facebook
ByQ A Mar 24, 2018

Facebook uses lots MySQL databases. Any information about how Facebook scales MySQL? Some information on the Web: MySQL at Facebook’s page https://www.facebook.com/MySQLatFacebook?filter=1 A post by Ryan Thiessen, Database Operations at Facebook on Quora: http://www.quora.com/Facebook-Engineering/How-does-Facebook-structure-MySQL-so-that-it-is-robust-and-scalable And more: http://mashable.com/2011/12/15/facebook-timeline-mysql/ http://gigaom.com/2011/12/06/facebook-shares-some-secrets-on-making-mysql-scale/ http://www.wired.com/wiredenterprise/2011/12/facebook-timeline-anatomy “A lot of people are surprised that for this shiny new thing for Facebook, we’re using…

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QA

How to debug/check network-related driver information on Linux?
ByEric Ma Mar 24, 2018Mar 24, 2018

How to debug/check network-related driver information on Linux? Several commands/tools that you may find usefull: Messages: dmesg grep NetworkManager /var/log/messages lshw: list hardware lshw -c network lsusb: list USB devices lsusb rfkill: enabling and disabling wireless devices rfkill unblock all rfkill event iwconfig: configure a wireless network interface iwconfig ifconfig: configure a network interface ifconfig…

Read More How to debug/check network-related driver information on Linux?
QA

How to get the hostname of the node in Python?
ByQ A Mar 24, 2018

In Python, how to get the hostname of the node? In Python, you can get the hostname by the socket.gethostname() library function in the socket module: import socket hostname = socket.gethostname() Example: $ python Python 2.7.5 (default, Nov 6 2016, 00:28:07) [GCC 4.8.5 20150623 (Red Hat 4.8.5-11)] on linux2 Type “help”, “copyright”, “credits” or “license”…

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QA

Finding All Available Versions of a Package in Ubuntu
ByEric Ma Mar 24, 2018Sep 30, 2021

How to find all available versions of a package in Ubuntu? To list available versions of a package: apt-cache showpkg <package-name> For example, to check all versions of thunderbird: $ sudo apt-cache showpkg thunderbird Package: thunderbird Versions: 1:31.1.1+build1-0ubuntu0.14.04.1 (/var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_trusty-updates_main_binary-amd64_Packages) (/var/lib/apt/lists/security.ubuntu.com_ubuntu_dists_trusty-security_main_binary-amd64_Packages) Description Language: File: /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_trusty_main_binary-amd64_Packages MD5: 68ed1001b79d708ad48956a0c129114d Description Language: en File: /var/lib/apt/lists/archive.ubuntu.com_ubuntu_dists_trusty_main_i18n_Translation-en MD5: 68ed1001b79d708ad48956a0c129114d 1:31.0+build1-0ubuntu0.14.04.1 (/var/lib/dpkg/status)…

Read More Finding All Available Versions of a Package in Ubuntu
Systems 101

Double-Spending 101
ByEthan Ainsworth Sep 16, 2023Sep 16, 2023

Double-spending is a critical issue that any digital currency must address to ensure its viability and security. In this post, we’ll explore the concept of double-spending, the problems it poses, and how blockchain technology overcomes these challenges. What is Double-Spending? Double-spending occurs when a user spends the same digital currency unit more than once. In…

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10 Comments

DigvijaySingh says:

Dec 14, 2012 at 8:48 pm

Hello I am a M.E student and I want to optimize live migration of virtual machine using xen. So how can I achieve it. orelse how can I do tcp analysis in xen durin live migration.

Any help will be great Sir.
Thanx.

Reply
1. Zhiqiang Ma says:
  
  Dec 14, 2012 at 11:17 pm
  
  Hi,
  
  You may want to take a look at this: http://wiki.xen.org/wiki/Migration
  
  For TCP analysis, other tools, such as tcpdump, may help you.
  
  Reply
2. dharshini says:
  
  Apr 15, 2013 at 4:38 pm
  
  hi i’m also m.e doing my project in xen ..i ‘ve a problem in installation of xen from source code.
  
  Cloning into ‘seabios-dir-remote.tmp’…
  fatal: unable to connect to xenbits.xen.org:
  xenbits.xen.org[0: 50.57.170.242]: errno=Connection timed out
  
  make[4]: *** [seabios-dir] Error 128
  make[4]: Leaving directory `/root/xen-4.2.1/tools/firmware’
  
  Reply
  1. Zhiqiang Ma says:
    
    Apr 15, 2013 at 5:14 pm
    
    As the output shows, you are building Xen-4.2.1 which possibly require a different method from the one introduced here.
    
    From your output, the error is:
    
    “Connection timed out”
    
    –> check your network.
    
    Reply
    1. dharshini says:
      
      Apr 15, 2013 at 5:19 pm
      
      after rectifying that error i’m getting a new error like this
      
      policydb.c: In function ‘policydb_read’:
      policydb.c:1779: error: format ‘%lu’ expects type ‘long unsigned int’, but argument 3 has type ‘size_t’
      make[7]: *** [policydb.o] Error 1
      make[7]: Leaving directory `/root/xen-4.2.1/xen/xsm/flask/ss’
      make[6]: *** [ss/built_in.o] Error 2
      make[6]: Leaving directory `/root/xen-4.2.1/xen/xsm/flask’
      make[5]: *** [flask/built_in.o] Error 2
      make[5]: Leaving directory `/root/xen-4.2.1/xen/xsm’
      make[4]: *** [/root/xen-4.2.1/xen/xsm/built_in.o] Error 2
      make[4]: Leaving directory `/root/xen-4.2.1/xen/arch/x86′
      make[3]: *** [/root/xen-4.2.1/xen/xen] Error 2
      make[3]: Leaving directory `/root/xen-4.2.1/xen’
      make[2]: *** [install] Error 2
      make[2]: Leaving directory `/root/xen-4.2.1/xen’
      make[1]: *** [install-xen] Error 2
      make[1]: Leaving directory `/root/xen-4.2.1′
      make: *** [world] Error 2
      
      Reply
3. dharshini says:
  
  Apr 15, 2013 at 5:19 pm
  
  policydb.c: In function ‘policydb_read’:
  policydb.c:1779: error: format ‘%lu’ expects type ‘long unsigned int’, but argument 3 has type ‘size_t’
  make[7]: *** [policydb.o] Error 1
  make[7]: Leaving directory `/root/xen-4.2.1/xen/xsm/flask/ss’
  make[6]: *** [ss/built_in.o] Error 2
  make[6]: Leaving directory `/root/xen-4.2.1/xen/xsm/flask’
  make[5]: *** [flask/built_in.o] Error 2
  make[5]: Leaving directory `/root/xen-4.2.1/xen/xsm’
  make[4]: *** [/root/xen-4.2.1/xen/xsm/built_in.o] Error 2
  make[4]: Leaving directory `/root/xen-4.2.1/xen/arch/x86′
  make[3]: *** [/root/xen-4.2.1/xen/xen] Error 2
  make[3]: Leaving directory `/root/xen-4.2.1/xen’
  make[2]: *** [install] Error 2
  make[2]: Leaving directory `/root/xen-4.2.1/xen’
  make[1]: *** [install-xen] Error 2
  make[1]: Leaving directory `/root/xen-4.2.1′
  make: *** [world] Error 2
  
  Reply
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Samantha says:

Oct 22, 2014 at 2:59 am

Hello I am student in technologies, I am working on a project to monitor virtual networks with Lattice Framework, does anyone know how to add the libraries from the Framework to use the Xen Hypervisor?

Reply