The first time I've read Steve's open letter about Flash I thought:
don't be too evil to the Flash developers - they're still learning how
to build a stable and fast plugin...But the new Flash plugin named
Gala (10.1) is going absolutely crazy. More than 400 threads just to
watch a stupid 5 min video? Are you kidding? HTML5 you are welcome,
what do you wanna drink?
I've spent a lot of time to get KVM on Ubuntu up and running. Now it's done and I want to share it with you.
Boot into rescue system (linux 64-bit)
# installimage
Select the following image.
ubuntu-9.10-64-bit
Now modify your installimage.conf to use LVM instead of normal partitioning.
DRIVE1 /dev/sda
DRIVE2 /dev/sdb
SWRAID 1
SWRAIDLEVEL 1
BOOTLOADER grub
HOSTNAME Ubuntu-910-karmic-64-minimal
PART /boot ext2 256M
PART lvm vg0 all
LV vg0 root / ext3 10G
LV vg0 swap swap swap 4G
IMAGE /root/.oldroot/nfs/install/../images/Ubuntu-910-karmic-64-minimal.tar.gz
Reboot your server.
# reboot
Login to your new system and prepare it for the KVM action. We are using libvirt as wrapper around QEMU. This simplifies a lot.
# apt-get update
# apt-get -y upgrade
# apt-get -y install libvirt-bin
First we need to configure the network on the host system. I’ve added the pointopoint command and removed the routing at the end of the file.
/etc/network/interfaces
auto lo
iface lo inet loopback
auto eth0
iface eth0 inet static
address <host-ip>
netmask 255.255.255.255
gateway <gateway-ip>
pointopoint <gateway-ip>
Enably routing by uncommenting the follwing in /etc/sysctl.conf
net.ipv4.ip_forward=1
and reload the settings.
# sysctl -p
Load the tun module into kernel
# modprobe tun
Add the following to /root/vg0.xml. This defines LVM as primary storage source for our virtual machines.
<pool type="logical">
<name>vg0</name>
<target>
<path>/dev/vg0</path>
</target>
</pool>
Hook it into the system using libvirt.
# virsh pool-define vg0.xml
# virsh pool-autostart vg0
# virsh pool-start vg0
Create a new logical volume for our guest. You can later expand the volume. Even shrinking is possible but not recommended.
# lvcreate -n vm1 -L 100G vg0
Now we have to define the machine itself. Put the following in /etc/libvirt/qemu/vmt.xml
This is the definition file for a KVM guest in libvirt format.
<domain type="kvm">
<name>vm1</name>
<uuid>593654cd-1d7f-6584-76ec-75496968e0b7</uuid>
<memory>1048576</memory>
<currentMemory>1048576</currentMemory>
<vcpu>2</vcpu>
<os>
<type arch="x86_64" machine="pc-0.11">hvm</type>
<boot dev="cdrom"/>
</os>
<features>
<acpi/>
</features>
<clock offset="utc"/>
<on_poweroff>destroy</on_poweroff>
<on_reboot>restart</on_reboot>
<on_crash>destroy</on_crash>
<devices>
<emulator>/usr/bin/kvm</emulator>
<disk type="file" device="disk">
<source file="/dev/vg0/vm1"/>
<target dev="hda" bus="ide"/>
</disk>
<disk type="file" device="cdrom">
<source file="/root/install-amd64-minimal-20100408.iso"/>
<target dev="hdc"/>
<readonly/>
</disk>
<interface type="ethernet">
<mac address="52:18:00:a7:cf:47"/>
<script path="/srv/vms/vm1-ifup"/>
<model type="virtio"/>
</interface>
<console type="pty" tty="/dev/pts/2">
<source path="/dev/pts/2"/>
<target port="0"/>
</console>
<graphics type="vnc" port="-1" autoport="yes" passwd="secret" keymap="de" listen="0.0.0.0"/>
<video>
<model type="cirrus" vram="9216" heads="1"/>
</video>
</devices>
</domain>
Hook it into the libvirt domain registry.
# virsh define /etc/libvirt/qemu/vm1.xml
Networking is based on simple routing. Therefor we’ll create a simple script that is called once the VM has been started. This script adds the necessary routing stuff for you.
# mkdir -p /srv/vms
Put the following in /srv/vms/vm1-ifup
#!/bin/sh
main_ip="<host-ip>"
main_dev="eth0"
vnet_ip="<guest-ip>"
vnet_dev=$1
echo 1 >/proc/sys/net/ipv4/ip_forward
echo 1 >/proc/sys/net/ipv4/conf/${main_dev}/proxy_arp
echo 1 >/proc/sys/net/ipv4/icmp_echo_ignore_broadcasts
echo 1 >/proc/sys/net/ipv4/conf/all/rp_filter
echo 1 >/proc/sys/net/ipv4/conf/${vnet_dev}/proxy_arp
ifconfig ${vnet_dev} ${main_ip} netmask 255.255.255.255 up
ip route add ${vnet_ip} dev ${vnet_dev} src ${main_ip}
# chmod +x /srv/vms/vm1-ifup
As I’m installing gentoo as the guest OS, we’ll have to download the install CD.
# cd / && wget http://gentoo.osuosl.org/releases/amd64/current-iso/install-amd64-minimal-20100408.iso
App Armor has a strange bug in the current version. It doesn’t work well together with QEMU and prevents it from starting properly. Thats why I’m going to deactivate it.
# /etc/init.d/apparmor stop
# /etc/init.d/libvirt-bin restart
After the guest is installed (Gentoo in my case). We need to define the network settings.
My /etc/conf.d/net is:
config_eth0=(
"<guest-ip> netmask 255.255.255.255 peer <host-ip>"
)
routes_eth0=(
"default via <host-ip>"
)
And here’s the corresponding /etc/resolv.conf with the Google DNS.
nameserver 8.8.8.8
JavaScript Regex Quick Reference
.Any character except newline. \.A period (and so on for \*,\(,\\, etc.)^The start of the string. $The end of the string. \d,\w,\sA digit, word character [A-Za-z0-9_], or whitespace.\D,\W,\SAnything except a digit, word character, or whitespace. [abc]Character a, b, or c. [a-z]a through z. [^abc]Any character except a, b, or c. aa|bbEither aa or bb. ?Zero or one of the preceding element. *Zero or more of the preceding element. +One or more of the preceding element. {n}Exactly n of the preceding element. {n,}n or more of the preceding element. {m,n}Between m and n of the preceding element. ??,*?,+?,{n}?, etc.Same as above, but as few as possible. (expr)Capture expr for use with \1, etc.(?:expr)Non-capturing group. (?=expr)Followed by expr. (?!expr)Not followed by expr.
mod your file input fields with this nice jquery plugin. i like the
upload progress bar!
very nice way to have smooth notifications on your page using jquery.
http://boedesign.com/blog/2009/07/11/growl-for-jquery-gritter/
