Libvirt (ancien) » Historique » Version 22
Version 21 (Laurent GUERBY, 14/07/2013 23:04) → Version 22/61 (Mehdi Abaakouk, 30/07/2013 14:36)
h1. Libvirt
h2. Resources/Liens
* Virtualisation du routage IPv4 pour les VM http://lists.tetaneutral.net/pipermail/technique/2013-April/000810.html
* libvirt
http://builder.virt-tools.org/artifacts/libvirt-virshcmdref/html/index.html
http://docs.fedoraproject.org/en-US/Fedora/13/html/Virtualization_Guide/chap-Virtualization-Managing_guests_with_virsh.html
* virt-install et preseed sans server web et pxe:
http://honk.sigxcpu.org/con/Preseeding_Debian_virtual_machines_with_virt_install.html
h2. Installation VM sans bridge avec routage static (en /32 pour l'ipv4)
Note: tous les fichiers utilisés et créés ne sont peut être pas à jour, voir ici pour les dernières version: http://git.tetaneutral.net/libvirt.git/
Le répertoire /etc/libvirt/ttnn cité plustard est géré dans ce git.
h3. Configuration de la libvirt
On créé un réseau libvirt qui fait rien (déjà fait sur n7):
<pre>
cat > libvirt_dump_network.xml <<EOF
<network ipv6='yes'>
<name>dump-net</name>
<bridge name='dumpbr0' />
</network>
EOF
virsh net-define libvirt_dump_network.xml
virsh net-autostart dump-net
virsh net-start dump-net
</pre>
On créé un hook libvirt (déjà fait sur n7):
<pre>
mkdir -p /etc/libvirt/ttnn/hooks
ln -s /etc/libvirt/ttnn/hooks /etc/libvirt/hooks
vi /etc/libvirt/hooks/qemu
----8<--------------->8----
#!/bin/bash
name="$1"
operation="$2"
suboperation="$3"
[ "$operation" != "start" ] && exit 0
[ "$suboperation" != "begin" ] && exit 0
# get interface from the libvirt xml
interface=$(cat - | sed -ne "/vnet/s/.*dev='\([^']*\)'.*/\1/gp")
[ -f /etc/libvirt/ttnn/${name}.conf ] && source /etc/libvirt/ttnn/${name}.conf
[ "$ip" -o "$ip6" ] && brctl delif dumpbr0 $interface
[ "$ip" ] && ip route add $ip/32 dev $interface
[ "$ip6" ] && ip route add $ip6/56 dev $interface
[ "$ip6" ] && ip -6 addr add fe80::31/64 dev $interface
exit 0
----8<--------------->8----
</pre>
h3. Preparation de l'installer
Pour une squeeze on met à jour virtinst (déjà fait sur n7):
<pre>
wget http://ftp.us.debian.org/debian/pool/main/v/virtinst/virtinst_0.600.3-3_all.deb
dpkg -i virtinst_0.600.3-3_all.deb
</pre>
On install le preseed.cfg attaché à la page dans /etc/libvirt/preseed.cfg (déjà fait sur n7)
h4. Installation d'une VM
Creation du disk (déjà fait sur n7):
<pre>
lvcreate -n picttn -L 50G /dev/raid5
</pre>
Configuration du routage static:
<pre>
vi /etc/libvirt/ttnn/picttn.conf
# le /32 ipv4
ip="91.224.148.252"
# le /56 ipv6
ip6="2a01:6600:8080:FC00::"
</pre>
Lancement de l'installation via le réseau natter de libvirt
<pre>
virt-install -n picttn -r 2048 --os-type=linux \
--autostart \
--disk /dev/raid5/picttn,bus=virtio,cache=none,io=native \
--network network=default,model=virtio \
--nographics \
--noreboot \
--wait -1 \
--location http://ftp.debian.org/debian/dists/wheezy/main/installer-amd64/ \
--serial pty \
--initrd-inject /etc/libvirt/ttnn/preseed.cfg \
--initrd-inject /etc/libvirt/ttnn/picttn.conf \
--initrd-inject /etc/libvirt/ttnn/postinstall.sh \
--extra-args "console=ttyS0,9600n8 DEBIAN_FRONTEND=text auto priority=critical hostname=picttn domain=le-pic.org"
</pre>
Une fois l'installation terminée, on change la conf réseau:
<pre>
EDITOR="sed -ie s/default/dump-net/g" virsh edit picttn
</pre>
On peux démarrer la VM
<pre>
virsh start picttn
virsh console picttn
</pre>
Ensuite on peux se connecte à la VM
<pre>
ssh root@2a01:6600:8080:FC00::1
</pre>
Le /etc/network/interfaces IPv4 après installation
<pre>
iface eth0 inet static
address 91.224.148.xxx
netmask 32
up ip route add 91.224.148.0/32 dev eth0
up ip route add default via 91.224.148.0
iface eth0 inet6 static
address 2a01:6600:8080:xx00::1
netmask 56
gateway fe80::31
pre-up /sbin/sysctl -w net.ipv6.conf.eth0.accept_ra=0
pre-up /sbin/sysctl -w net.ipv6.conf.eth0.autoconf=0
</pre>
h2. Misc
<H4Mm3r> si tu lance la création de la VM sans avoir créé le disk --disk /vmroot/testnat.qcow2,format=qcow2,size=12,bus=virtio,cache=writeback
<H4Mm3r> le disk se créé mais dans le XML le format est à RAW
<H4Mm3r> si tu le créé à l'avance avec qemu-img create -f qcow2
<H4Mm3r> et que tu lance ta commande --disk /vmroot/testnat.qcow2,format=qcow2
<guerby> ok donc c'etait bien ça :)
<guerby> bbl (miam)
<H4Mm3r> dans le fichier XML le format est à RAW
<H4Mm3r> il faut en effet dumper un XML, modifier la valeur à QCOW2
<H4Mm3r> et créer la VM depuis ce XML
<H4Mm3r> virsh create file.xml
<H4Mm3r> pourqu'enfin il comprenne que c'est du QCOW...
<H4Mm3r> et là mon disk fait bien 265ko, mais est détecté comme 12G :D
h2. HOWTO by H4Mm3r (under contruction)
h3. Usefull links
#### Misc
#OS Type
http://rhevdup.blogspot.fr/2012/05/list-available-os-types-for-kvm-on-rhel.html
#Libvirt TTN
http://chiliproject.tetaneutral.net/projects/tetaneutral/wiki/Libvirt
#### KVM management
#Install QEMU KVM + LIBVIRT
http://www.howtoforge.com/virtualization-with-kvm-on-a-debian-squeeze-server
#Edit XML file
http://vladnevzorov.com/2011/02/11/how-to-change-configuration-of-kvm-virtual-machine/
#Clone a KVM
https://help.ubuntu.com/community/KVM/CreateGuests#Cloning_a_virtual_machine
http://linux.die.net/man/1/virt-clone
#### Network
#NAT
http://www.linuxquestions.org/questions/linux-networking-3/kvm-qemu-and-nat-on-the-host-machine-mini-tutorial-697980/
http://wiki.libvirt.org/page/Networking
http://libvirt.org/formatnetwork.html#examplesNAT
https://help.ubuntu.com/community/KVM/Networking
#Bridge
http://toast.djw.org.uk/qemu.html
http://www.mediaonfire.com/en/tech_tips/QEMUNetworking.html (bridge, nat, arp)
#### Improve performance
http://blog.bodhizazen.net/linux/improve-kvm-performance/
http://www.linux-kvm.org/page/Tuning_KVM
http://www.ezunix.org/index.php?title=Boost_performance_of_KVM_guests
#### Storage
http://doc.opensuse.org/products/draft/SLES/SLES-kvm_sd_draft/cha.libvirt.storage.html
h3. HOWTO
<pre>
[H] = Host
[G] = Guest
[XML] = XML content
"command"
</pre>
#### Diskfile Storage
#Create qcow2 disk
<pre>
[H] "qemu-img create -f qcow2 /path/to/disk.qcow2 $SIZE" (ex: 20G)
[H] "chmod +x /path/to/disk.qcow2"
</pre>
#Convert raw to qcow2
<pre>
[H] "qemu-img convert -O qcow2 disk.img disk.qcow2"
</pre>
#Disable cache to improve performance
<pre>
[XML] <driver name='qemu' type='qcow2' cache='none'/>
</pre>
#### LVM Storage
<pre>
[H] Create "/etc/libvirt/storage/vmdata.xml" file :
<pool type="logical">
<name>my_pool</name>
<source>
<device path="/path/to/dev"/>
</source>
<target>
<path>/target/path/path> (LV will be created there)
</target>
</pool>
[H] "virsh pool-define /etc/libvirt/storage/my_pool.xml"
[H] "virsh pool-start my_pool"
[H] "virsh pool-autostart my_pool"
[H] "virsh pool-info my_pool"
[H] "virsh vol-create-as my_pool my_logical_volume 12G"
[H] You must create a LV to be able to give it to a KVM "virsh vol-create-as my_pool my_vol 12G --format=lvm2"
</pre>
h3. Create KVM
#Bridged with TAP + LVM
<pre>
[H] "virt-install -d --hvm --vnc --name=my_kvm --vcpus=4 --cpuset=0-4 --ram 2048 --disk vol=my_pool/my_vol,bus=virtio,cache=none --network bridge=my_bridge,model=virtio -c /path/to/distrib.iso --keymap=fr --os-type=linux --noautoconsole"
</pre>
#TAP (if you want to rename the default "vnetX" interface by "tapX"
<pre>
[H] "virsh dumpxml my_guest > my_guest.xml
[H] "virsh undefine my_guest"
[H] Edit the my_guest.xml file to rename VNETX by TAPX
[H] "virsh define my_guest.xml"
[H] "virsh start my_guest"
</pre>
#NATed + LVM
<pre>
[H] "virt-install -d --hvm --vnc --name=my_kvm --vcpus=4 --cpuset=0-4 --ram 2048 --disk vol=my_pool/my_vol,bus=virtio,cache=none --network network=my_network,model=virtio -c /path/to/distrib.iso --keymap=fr --os-type=linux --noautoconsole"
</pre>
#Clone VM
<pre>
[H] Create the LVM dest
[H] Pause the KVM "virsh suspend my_kvm"
[H] virt-clone -o my_orig_kvm -n my_cloned_kvm -f=/path/to/lvm/dev
[G] Go and change the hostname and resolv.conf
</pre>
h3. Command explanation
#Bridged with tap
<pre>
virt-install -d --hvm --vnc --name=testlvm \
--vcpus=4 --cpuset=0-4 \
--ram 2048 \
--disk vol=vmdata/testlvm,bus=virtio,cache=none \
--network bridge=br0,model=virtio \
-c /data/isos/debian-testing-amd64-netinst.iso \
--keymap=fr --os-type=linux --os-variant=debiansqueeze --noautoconsole
</pre>
#NATed
<pre>
virt-install -d --hvm --vnc --name=testlvm \
--vcpus=4 --cpuset=0-4 \
--ram 2048 \
--disk vol=vmdata/testlvm,bus=virtio,cache=none \
--network network=frp_network,model=virtio \
-c /data/isos/debian-testing-amd64-netinst.iso \
--keymap=fr --os-type=linux --os-variant=debiansqueeze --noautoconsole
</pre>
[OLD QCOW2]
<pre>
[H] "virt-install --connect qemu:///system -n puppetnode1 -r 1024 --vcpus=4 --cpuset=4-7 --disk path=/vmroot/puppetnode1.qcow2 -c /data/isos/debian-6.0.6-amd64-netinst.iso --vnc --keymap=fr --noautoconsole --os-type linux --os-variant debiansqueeze --accelerate --network network=default --hvm"
[H] "virt-install --connect qemu:///system -n testnat -r 1024 --vcpus=2 --cpuset=2-3 --disk /vmroot/testnat.qcow2,format=qcow2,size=12,bus=virtio,cache=writeback -c /data/isos/debian-6.0.6-amd64-netinst.iso --vnc --keymap=fr --noautoconsole --os-type linux --os-variant debiansqueeze --accelerate --network bridge=br0 --hvm"
</pre>
#Start a KVM
<pre>
[H] "virsh start my_kvm"
</pre>
#Stop node
<pre>
[H] Soft : "virsh shutdown my_kvm"
[H] Hard : "virsh destroy my_kvm"
</pre>
#Suppr node del
<pre>
[H] "virsh undefine node" (+ remove files)
</pre>
#Rename node
<pre>
[H] "virsh dumpxml my_kvm > foo.xml"
[H] <edit foo.xml, change the name, move storage>
[H] "virsh undefine my_kvm"
[H] "virsh define foo.xml"
</pre>
# Connect to virsh qemu
<pre>
[H] "virsh --connect qemu:///system"
[H] "virsh # help"
</pre>
#Start a network
<pre>
[H] "virsh net-start my_network"
</pre>
#Configure VNC
<pre>
[H] Edit /etc/libvirt/qemu.conf and set vnc_listen = "your.ip.addd"
[H] You need to restart service "/etc/init.d/libvirtd restart"
[H] "ps aux | grep -i kvm" (find vnc display for your KVM)
</pre>
#Connect to a KVM through VNC
<pre>
tightvncviewer -compresslevel 7 -encodings "copyrect tight hextile zlib corre rre raw" x.xxx.xxx.xxx:x
</pre>
#Keyboard FR for KVM
<pre>
[H] "virsh edit my_kvm"
[XML] <graphics type='vnc' port='-1' autoport='yes' keymap='fr'/>
</pre>
#Create your own NAT network
<pre>
[H] Create your_nat.xml file :
[XML] <network>
<name>frp_network</name>
<forward mode='nat'/>
<bridge name='br1' stp='on' delay='0' />
<ip address='10.16.42.1' netmask='255.255.255.0'>
<dhcp>
<range start='10.16.42.2' end='10.16.42.50' />
</dhcp>
</ip>
</network>
[H] "virsh net-define your_nat.xml"
[H] "virsh net-start your_nat.xml"
[H] "virsh net-autostart your_nat.xml"
[XML] Network type "interface type = network, source network=your_nat"
</pre>
#IBM advisements to improve performance
<pre>
[H] Use LVM (or other direct access to HDD) for VMs storage (from 45 to 3' to install a VM)
[H] Set the swappiness value to 0 ("echo 0 > /proc/sys/vm/swappiness" && edit "/etc/sysctl.conf" and add "vm.swappiness=0")
[H] Disable zone_reclaim ("echo 0 > /proc/sys/vm/zone_reclaim_mode" && edit "/etc/sysctl.conf" and add "vm.zone_reclaim_mode=0")
[H] Enable KSM ("echo 1 > /sys/kernel/mm/ksm/run") and set the check time to 200ms ("echo 200 > /sys/kernel/mm/ksm/sleep_millisecs")
</pre>
h2. PC velizy
<pre>
root@tetaneutral1:~# fdisk /dev/sdb
Command (m for help): p
Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 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
Disk identifier: 0x9bf0c7df
Device Boot Start End Blocks Id System
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1):
Using default value 1
First sector (2048-3907029167, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-3907029167, default 3907029167):
Using default value 3907029167
Command (m for help): n
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p): ^C
root@tetaneutral1:~# fdisk /dev/sdb
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-3907029167, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-3907029167, default 3907029167):
Using default value 3907029167
Command (m for help): p
Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 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
Disk identifier: 0x9bf0c7df
Device Boot Start End Blocks Id System
/dev/sdb1 2048 3907029167 1953513560 83 Linux
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 85 Linux extended c7 Syrinx
5 Extended 41 PPC PReP Boot 86 NTFS volume set da Non-FS data
6 FAT16 42 SFS 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS/exFAT 4d QNX4.x 88 Linux plaintext de Dell Utility
8 AIX 4e QNX4.x 2nd part 8e Linux LVM df BootIt
9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD ee GPT
f W95 Ext'd (LBA) 54 OnTrackDM6 a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a9 NetBSD f4 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor ab Darwin boot f2 DOS secondary
16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
1e Hidden W95 FAT1 80 Old Minix
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
</pre>
<pre>
pvcreate /dev/sdb1
vgcreate vm-velizy /dev/sdb1
</pre>
h2. Resources/Liens
* Virtualisation du routage IPv4 pour les VM http://lists.tetaneutral.net/pipermail/technique/2013-April/000810.html
* libvirt
http://builder.virt-tools.org/artifacts/libvirt-virshcmdref/html/index.html
http://docs.fedoraproject.org/en-US/Fedora/13/html/Virtualization_Guide/chap-Virtualization-Managing_guests_with_virsh.html
* virt-install et preseed sans server web et pxe:
http://honk.sigxcpu.org/con/Preseeding_Debian_virtual_machines_with_virt_install.html
h2. Installation VM sans bridge avec routage static (en /32 pour l'ipv4)
Note: tous les fichiers utilisés et créés ne sont peut être pas à jour, voir ici pour les dernières version: http://git.tetaneutral.net/libvirt.git/
Le répertoire /etc/libvirt/ttnn cité plustard est géré dans ce git.
h3. Configuration de la libvirt
On créé un réseau libvirt qui fait rien (déjà fait sur n7):
<pre>
cat > libvirt_dump_network.xml <<EOF
<network ipv6='yes'>
<name>dump-net</name>
<bridge name='dumpbr0' />
</network>
EOF
virsh net-define libvirt_dump_network.xml
virsh net-autostart dump-net
virsh net-start dump-net
</pre>
On créé un hook libvirt (déjà fait sur n7):
<pre>
mkdir -p /etc/libvirt/ttnn/hooks
ln -s /etc/libvirt/ttnn/hooks /etc/libvirt/hooks
vi /etc/libvirt/hooks/qemu
----8<--------------->8----
#!/bin/bash
name="$1"
operation="$2"
suboperation="$3"
[ "$operation" != "start" ] && exit 0
[ "$suboperation" != "begin" ] && exit 0
# get interface from the libvirt xml
interface=$(cat - | sed -ne "/vnet/s/.*dev='\([^']*\)'.*/\1/gp")
[ -f /etc/libvirt/ttnn/${name}.conf ] && source /etc/libvirt/ttnn/${name}.conf
[ "$ip" -o "$ip6" ] && brctl delif dumpbr0 $interface
[ "$ip" ] && ip route add $ip/32 dev $interface
[ "$ip6" ] && ip route add $ip6/56 dev $interface
[ "$ip6" ] && ip -6 addr add fe80::31/64 dev $interface
exit 0
----8<--------------->8----
</pre>
h3. Preparation de l'installer
Pour une squeeze on met à jour virtinst (déjà fait sur n7):
<pre>
wget http://ftp.us.debian.org/debian/pool/main/v/virtinst/virtinst_0.600.3-3_all.deb
dpkg -i virtinst_0.600.3-3_all.deb
</pre>
On install le preseed.cfg attaché à la page dans /etc/libvirt/preseed.cfg (déjà fait sur n7)
h4. Installation d'une VM
Creation du disk (déjà fait sur n7):
<pre>
lvcreate -n picttn -L 50G /dev/raid5
</pre>
Configuration du routage static:
<pre>
vi /etc/libvirt/ttnn/picttn.conf
# le /32 ipv4
ip="91.224.148.252"
# le /56 ipv6
ip6="2a01:6600:8080:FC00::"
</pre>
Lancement de l'installation via le réseau natter de libvirt
<pre>
virt-install -n picttn -r 2048 --os-type=linux \
--autostart \
--disk /dev/raid5/picttn,bus=virtio,cache=none,io=native \
--network network=default,model=virtio \
--nographics \
--noreboot \
--wait -1 \
--location http://ftp.debian.org/debian/dists/wheezy/main/installer-amd64/ \
--serial pty \
--initrd-inject /etc/libvirt/ttnn/preseed.cfg \
--initrd-inject /etc/libvirt/ttnn/picttn.conf \
--initrd-inject /etc/libvirt/ttnn/postinstall.sh \
--extra-args "console=ttyS0,9600n8 DEBIAN_FRONTEND=text auto priority=critical hostname=picttn domain=le-pic.org"
</pre>
Une fois l'installation terminée, on change la conf réseau:
<pre>
EDITOR="sed -ie s/default/dump-net/g" virsh edit picttn
</pre>
On peux démarrer la VM
<pre>
virsh start picttn
virsh console picttn
</pre>
Ensuite on peux se connecte à la VM
<pre>
ssh root@2a01:6600:8080:FC00::1
</pre>
Le /etc/network/interfaces IPv4 après installation
<pre>
iface eth0 inet static
address 91.224.148.xxx
netmask 32
up ip route add 91.224.148.0/32 dev eth0
up ip route add default via 91.224.148.0
iface eth0 inet6 static
address 2a01:6600:8080:xx00::1
netmask 56
gateway fe80::31
pre-up /sbin/sysctl -w net.ipv6.conf.eth0.accept_ra=0
pre-up /sbin/sysctl -w net.ipv6.conf.eth0.autoconf=0
</pre>
h2. Misc
<H4Mm3r> si tu lance la création de la VM sans avoir créé le disk --disk /vmroot/testnat.qcow2,format=qcow2,size=12,bus=virtio,cache=writeback
<H4Mm3r> le disk se créé mais dans le XML le format est à RAW
<H4Mm3r> si tu le créé à l'avance avec qemu-img create -f qcow2
<H4Mm3r> et que tu lance ta commande --disk /vmroot/testnat.qcow2,format=qcow2
<guerby> ok donc c'etait bien ça :)
<guerby> bbl (miam)
<H4Mm3r> dans le fichier XML le format est à RAW
<H4Mm3r> il faut en effet dumper un XML, modifier la valeur à QCOW2
<H4Mm3r> et créer la VM depuis ce XML
<H4Mm3r> virsh create file.xml
<H4Mm3r> pourqu'enfin il comprenne que c'est du QCOW...
<H4Mm3r> et là mon disk fait bien 265ko, mais est détecté comme 12G :D
h2. HOWTO by H4Mm3r (under contruction)
h3. Usefull links
#### Misc
#OS Type
http://rhevdup.blogspot.fr/2012/05/list-available-os-types-for-kvm-on-rhel.html
#Libvirt TTN
http://chiliproject.tetaneutral.net/projects/tetaneutral/wiki/Libvirt
#### KVM management
#Install QEMU KVM + LIBVIRT
http://www.howtoforge.com/virtualization-with-kvm-on-a-debian-squeeze-server
#Edit XML file
http://vladnevzorov.com/2011/02/11/how-to-change-configuration-of-kvm-virtual-machine/
#Clone a KVM
https://help.ubuntu.com/community/KVM/CreateGuests#Cloning_a_virtual_machine
http://linux.die.net/man/1/virt-clone
#### Network
#NAT
http://www.linuxquestions.org/questions/linux-networking-3/kvm-qemu-and-nat-on-the-host-machine-mini-tutorial-697980/
http://wiki.libvirt.org/page/Networking
http://libvirt.org/formatnetwork.html#examplesNAT
https://help.ubuntu.com/community/KVM/Networking
#Bridge
http://toast.djw.org.uk/qemu.html
http://www.mediaonfire.com/en/tech_tips/QEMUNetworking.html (bridge, nat, arp)
#### Improve performance
http://blog.bodhizazen.net/linux/improve-kvm-performance/
http://www.linux-kvm.org/page/Tuning_KVM
http://www.ezunix.org/index.php?title=Boost_performance_of_KVM_guests
#### Storage
http://doc.opensuse.org/products/draft/SLES/SLES-kvm_sd_draft/cha.libvirt.storage.html
h3. HOWTO
<pre>
[H] = Host
[G] = Guest
[XML] = XML content
"command"
</pre>
#### Diskfile Storage
#Create qcow2 disk
<pre>
[H] "qemu-img create -f qcow2 /path/to/disk.qcow2 $SIZE" (ex: 20G)
[H] "chmod +x /path/to/disk.qcow2"
</pre>
#Convert raw to qcow2
<pre>
[H] "qemu-img convert -O qcow2 disk.img disk.qcow2"
</pre>
#Disable cache to improve performance
<pre>
[XML] <driver name='qemu' type='qcow2' cache='none'/>
</pre>
#### LVM Storage
<pre>
[H] Create "/etc/libvirt/storage/vmdata.xml" file :
<pool type="logical">
<name>my_pool</name>
<source>
<device path="/path/to/dev"/>
</source>
<target>
<path>/target/path/path> (LV will be created there)
</target>
</pool>
[H] "virsh pool-define /etc/libvirt/storage/my_pool.xml"
[H] "virsh pool-start my_pool"
[H] "virsh pool-autostart my_pool"
[H] "virsh pool-info my_pool"
[H] "virsh vol-create-as my_pool my_logical_volume 12G"
[H] You must create a LV to be able to give it to a KVM "virsh vol-create-as my_pool my_vol 12G --format=lvm2"
</pre>
h3. Create KVM
#Bridged with TAP + LVM
<pre>
[H] "virt-install -d --hvm --vnc --name=my_kvm --vcpus=4 --cpuset=0-4 --ram 2048 --disk vol=my_pool/my_vol,bus=virtio,cache=none --network bridge=my_bridge,model=virtio -c /path/to/distrib.iso --keymap=fr --os-type=linux --noautoconsole"
</pre>
#TAP (if you want to rename the default "vnetX" interface by "tapX"
<pre>
[H] "virsh dumpxml my_guest > my_guest.xml
[H] "virsh undefine my_guest"
[H] Edit the my_guest.xml file to rename VNETX by TAPX
[H] "virsh define my_guest.xml"
[H] "virsh start my_guest"
</pre>
#NATed + LVM
<pre>
[H] "virt-install -d --hvm --vnc --name=my_kvm --vcpus=4 --cpuset=0-4 --ram 2048 --disk vol=my_pool/my_vol,bus=virtio,cache=none --network network=my_network,model=virtio -c /path/to/distrib.iso --keymap=fr --os-type=linux --noautoconsole"
</pre>
#Clone VM
<pre>
[H] Create the LVM dest
[H] Pause the KVM "virsh suspend my_kvm"
[H] virt-clone -o my_orig_kvm -n my_cloned_kvm -f=/path/to/lvm/dev
[G] Go and change the hostname and resolv.conf
</pre>
h3. Command explanation
#Bridged with tap
<pre>
virt-install -d --hvm --vnc --name=testlvm \
--vcpus=4 --cpuset=0-4 \
--ram 2048 \
--disk vol=vmdata/testlvm,bus=virtio,cache=none \
--network bridge=br0,model=virtio \
-c /data/isos/debian-testing-amd64-netinst.iso \
--keymap=fr --os-type=linux --os-variant=debiansqueeze --noautoconsole
</pre>
#NATed
<pre>
virt-install -d --hvm --vnc --name=testlvm \
--vcpus=4 --cpuset=0-4 \
--ram 2048 \
--disk vol=vmdata/testlvm,bus=virtio,cache=none \
--network network=frp_network,model=virtio \
-c /data/isos/debian-testing-amd64-netinst.iso \
--keymap=fr --os-type=linux --os-variant=debiansqueeze --noautoconsole
</pre>
[OLD QCOW2]
<pre>
[H] "virt-install --connect qemu:///system -n puppetnode1 -r 1024 --vcpus=4 --cpuset=4-7 --disk path=/vmroot/puppetnode1.qcow2 -c /data/isos/debian-6.0.6-amd64-netinst.iso --vnc --keymap=fr --noautoconsole --os-type linux --os-variant debiansqueeze --accelerate --network network=default --hvm"
[H] "virt-install --connect qemu:///system -n testnat -r 1024 --vcpus=2 --cpuset=2-3 --disk /vmroot/testnat.qcow2,format=qcow2,size=12,bus=virtio,cache=writeback -c /data/isos/debian-6.0.6-amd64-netinst.iso --vnc --keymap=fr --noautoconsole --os-type linux --os-variant debiansqueeze --accelerate --network bridge=br0 --hvm"
</pre>
#Start a KVM
<pre>
[H] "virsh start my_kvm"
</pre>
#Stop node
<pre>
[H] Soft : "virsh shutdown my_kvm"
[H] Hard : "virsh destroy my_kvm"
</pre>
#Suppr node del
<pre>
[H] "virsh undefine node" (+ remove files)
</pre>
#Rename node
<pre>
[H] "virsh dumpxml my_kvm > foo.xml"
[H] <edit foo.xml, change the name, move storage>
[H] "virsh undefine my_kvm"
[H] "virsh define foo.xml"
</pre>
# Connect to virsh qemu
<pre>
[H] "virsh --connect qemu:///system"
[H] "virsh # help"
</pre>
#Start a network
<pre>
[H] "virsh net-start my_network"
</pre>
#Configure VNC
<pre>
[H] Edit /etc/libvirt/qemu.conf and set vnc_listen = "your.ip.addd"
[H] You need to restart service "/etc/init.d/libvirtd restart"
[H] "ps aux | grep -i kvm" (find vnc display for your KVM)
</pre>
#Connect to a KVM through VNC
<pre>
tightvncviewer -compresslevel 7 -encodings "copyrect tight hextile zlib corre rre raw" x.xxx.xxx.xxx:x
</pre>
#Keyboard FR for KVM
<pre>
[H] "virsh edit my_kvm"
[XML] <graphics type='vnc' port='-1' autoport='yes' keymap='fr'/>
</pre>
#Create your own NAT network
<pre>
[H] Create your_nat.xml file :
[XML] <network>
<name>frp_network</name>
<forward mode='nat'/>
<bridge name='br1' stp='on' delay='0' />
<ip address='10.16.42.1' netmask='255.255.255.0'>
<dhcp>
<range start='10.16.42.2' end='10.16.42.50' />
</dhcp>
</ip>
</network>
[H] "virsh net-define your_nat.xml"
[H] "virsh net-start your_nat.xml"
[H] "virsh net-autostart your_nat.xml"
[XML] Network type "interface type = network, source network=your_nat"
</pre>
#IBM advisements to improve performance
<pre>
[H] Use LVM (or other direct access to HDD) for VMs storage (from 45 to 3' to install a VM)
[H] Set the swappiness value to 0 ("echo 0 > /proc/sys/vm/swappiness" && edit "/etc/sysctl.conf" and add "vm.swappiness=0")
[H] Disable zone_reclaim ("echo 0 > /proc/sys/vm/zone_reclaim_mode" && edit "/etc/sysctl.conf" and add "vm.zone_reclaim_mode=0")
[H] Enable KSM ("echo 1 > /sys/kernel/mm/ksm/run") and set the check time to 200ms ("echo 200 > /sys/kernel/mm/ksm/sleep_millisecs")
</pre>
h2. PC velizy
<pre>
root@tetaneutral1:~# fdisk /dev/sdb
Command (m for help): p
Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 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
Disk identifier: 0x9bf0c7df
Device Boot Start End Blocks Id System
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1):
Using default value 1
First sector (2048-3907029167, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-3907029167, default 3907029167):
Using default value 3907029167
Command (m for help): n
Partition type:
p primary (1 primary, 0 extended, 3 free)
e extended
Select (default p): ^C
root@tetaneutral1:~# fdisk /dev/sdb
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p): p
Partition number (1-4, default 1): 1
First sector (2048-3907029167, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-3907029167, default 3907029167):
Using default value 3907029167
Command (m for help): p
Disk /dev/sdb: 2000.4 GB, 2000398934016 bytes
255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 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
Disk identifier: 0x9bf0c7df
Device Boot Start End Blocks Id System
/dev/sdb1 2048 3907029167 1953513560 83 Linux
Command (m for help): m
Command action
a toggle a bootable flag
b edit bsd disklabel
c toggle the dos compatibility flag
d delete a partition
l list known partition types
m print this menu
n add a new partition
o create a new empty DOS partition table
p print the partition table
q quit without saving changes
s create a new empty Sun disklabel
t change a partition's system id
u change display/entry units
v verify the partition table
w write table to disk and exit
x extra functionality (experts only)
Command (m for help): t
Selected partition 1
Hex code (type L to list codes): L
0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris
1 FAT12 27 Hidden NTFS Win 82 Linux swap / So c1 DRDOS/sec (FAT-
2 XENIX root 39 Plan 9 83 Linux c4 DRDOS/sec (FAT-
3 XENIX usr 3c PartitionMagic 84 OS/2 hidden C: c6 DRDOS/sec (FAT-
4 FAT16 <32M 40 Venix 80286 85 Linux extended c7 Syrinx
5 Extended 41 PPC PReP Boot 86 NTFS volume set da Non-FS data
6 FAT16 42 SFS 87 NTFS volume set db CP/M / CTOS / .
7 HPFS/NTFS/exFAT 4d QNX4.x 88 Linux plaintext de Dell Utility
8 AIX 4e QNX4.x 2nd part 8e Linux LVM df BootIt
9 AIX bootable 4f QNX4.x 3rd part 93 Amoeba e1 DOS access
a OS/2 Boot Manag 50 OnTrack DM 94 Amoeba BBT e3 DOS R/O
b W95 FAT32 51 OnTrack DM6 Aux 9f BSD/OS e4 SpeedStor
c W95 FAT32 (LBA) 52 CP/M a0 IBM Thinkpad hi eb BeOS fs
e W95 FAT16 (LBA) 53 OnTrack DM6 Aux a5 FreeBSD ee GPT
f W95 Ext'd (LBA) 54 OnTrackDM6 a6 OpenBSD ef EFI (FAT-12/16/
10 OPUS 55 EZ-Drive a7 NeXTSTEP f0 Linux/PA-RISC b
11 Hidden FAT12 56 Golden Bow a8 Darwin UFS f1 SpeedStor
12 Compaq diagnost 5c Priam Edisk a9 NetBSD f4 SpeedStor
14 Hidden FAT16 <3 61 SpeedStor ab Darwin boot f2 DOS secondary
16 Hidden FAT16 63 GNU HURD or Sys af HFS / HFS+ fb VMware VMFS
17 Hidden HPFS/NTF 64 Novell Netware b7 BSDI fs fc VMware VMKCORE
18 AST SmartSleep 65 Novell Netware b8 BSDI swap fd Linux raid auto
1b Hidden W95 FAT3 70 DiskSecure Mult bb Boot Wizard hid fe LANstep
1c Hidden W95 FAT3 75 PC/IX be Solaris boot ff BBT
1e Hidden W95 FAT1 80 Old Minix
Hex code (type L to list codes): 8e
Changed system type of partition 1 to 8e (Linux LVM)
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
</pre>
<pre>
pvcreate /dev/sdb1
vgcreate vm-velizy /dev/sdb1
</pre>