Wednesday, March 03, 2010

HOWTO: Linux Container (LXC) on Fedora 12

Those who are familiar with BSD Jails or Solaris Zones might be quite familiar to the concept of OS-level virtualization. The Linux world have several options for this, such as the User Mode Linux (UML), OpenVZ, Linux Vserver, and most recently, Linux Container (LXC).

Unlike the other alternatives, which requires specially patched kernels to run it, LXC got fully functional in the upstream kernel since 2.6.29, which is a plus as it made it easier to deploy it in many prexisting distros which ship 2.6.29, including Fedora - without messing around with the distro packages.

In this HOWTO, I'll guide through the process of deploying your own LXC in Fedora 12, with NAT to libvirt's virbr0

Preparation

yum install libvirt lxc


(ping me if i forgot to add any packages)

start libvirt so that virbr0 is configured
/sbin/service libvirtd start


mount control group in /cgroup
echo "none /cgroup cgroup   defaults  0 0" >> /etc/fstab
mkdir /cgroup
mount /cgroup


LXC Fedora Script

The lxc rpm provides a script named lxc-fedora to aid creation of lxc container. However, when I tried it, it doesnt quite work. After some googling, I found this guide http://blog.bodhizazen.net/linux/lxc-configure-fedora-containers/, of which, based on it, I've updated the lxc-fedora script accordingly to make it work using febootstrap.

You can grab the script in my FedoraPeople GIT repository here : lxc-febootstrap

Download the script and save it somewhere in you system path.

Creating the Container

lxc-febootstrap create


The script would install the container rootfs in /var/lib/lxc/rootfs/. So make sure you have enough free space to store it (around 400MB for the base bootstrap). You'll also need approximately 400MB in /var/cache/lxc for the reusable vanilla copy of the rootfs.

Answer the questions from the script, and wait until the process is done. At the end of the process, the script would ask for a password for root. Set it.

Controlling the LXC Container

You can start the container using:
lxc-start -n <containername>


You can start the container in background using:
lxc-start -d -n <containername>


Stop it using:
lxc-stop -n <containername>


Destroy it using:
lxc-febootstrap destroy


Connect to a console of the LXC using:
lxc-console -n <containername>


Networking

The lxc-febootstrap script have been configured to make use of libvirt's virbr0. It is a virtual bridge, so treat it like any other networking bridge in Linux.

The default configuration of virbr0 (if i'm not mistaken) is that it have dhcp and routing already configured for virtual machines that utilize it. So, networking should JustWorks (unless I missed certain steps in this guide, currently it worksforme).

Thats it .. Enjoy and Happy Hacking :D

Tuesday, March 02, 2010

FOSS.Org.MY Meetup : March 2010

FOSS.Org.MY (formerly: MyOSS) Meetup is BACK!!!! with a new name, and a new format, and new timing!!

We will be having Lightning Talk session after the speaker's talk, if you have anything to share, do contribute to the Lightning Talk.


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Open Source Software in Digital Content Creation
==================================================

A general overview of OSS used in Digital Content Creation industries with a focus in animation production from small personal projects to Hollywood production.

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About the Speaker
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Victor Yap helps companies build cost-efficient production workflow for 3D animation. His current project migrates open source solutions, with programs like Blender to a constantly developing 3D animation environment. Blender is a strong open source contender to mainstream programs such as Maya and Softimage. Armed with an Electronic Arts degree and deeply involved with Open Source Software (OSS) development since 1996, he presently dedicates himself to using open source as a tool for digital content creation. True to the spirit of OSS, he wants to share his experiences, insights and knowledge with everyone.

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When:
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Saturday, 20th March 2010

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What - Meetup Agenda:
======================

2:30pm - 2:45pm : Registration
2:45pm - 3:00pm : Opening by the organizer
3pm - 4pm : Talk
4pm - 4:30pm : Lightning Talks
4:30pm - 5:00pm: Breakout Session

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Cost
====

Free of charge (gratis)

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Contact
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Mohd Izhar Firdaus Ismail
izhar@foss.org.my
+60172792765

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Where
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iTrain (M) Sdn Bhd,

Unit E-7-1, Block E, Megan Avenue 1, 189 Jalan Tun Razak, 50400 Kuala Lumpur, Malaysia

================
About the Meetup
================

This meetup is possible due to the support and facilities provided by iTrain Sdn Bhd (http://www.itrain.com.my/)



Facebook RSVP of this event
Full event details, including map

Monday, March 01, 2010

Wizardpen for F12

Updated the wizardpen RPM - added patch for Xorg 1.7. (Yup, i'm 4 months late :P)

Src.rpm here: wizardpen-0.7.0-2.fc12.src.rpm. It worked for me, but your mileage might vary.