Creating a New VM Guest on an IETF NOC Ganeti Cluster

Install Image Types

Install the noop image type on all nodes in the cluster

echo 'deb http://repo.noc.grnet.gr/ wheezy main' > /etc/apt/sources.list.d/grnet.list
wget -O - http://repo.noc.grnet.gr/grnet.gpg.key | apt-key add -
apt-get update
apt-get install ganeti-os-noop

If you get in trouble with apt-get update failing using IPv6, try

cat > /etc/apt/apt.conf.d/99force-ipv4
Acquire::ForceIPv4 "true";

Now you can create instances a la

gnt-instance add -t plain -o noop
...

Create the VM

This is the script i use as it is in vmhost-4:~randy/do-nnew

#!/bin/sh

# do-new node diskGB ramGB nameFQDN

NODE=$1
DISK=$2
RAM=$3
NAME=$4

gnt-instance add \
     -t plain \
     -o noop \
     -s ${DISK}G \
     -B maxmem=${RAM}G,minmem=$((${RAM}/2))G \
     -n $NODE \
     -H kvm:vnc_bind_address=127.0.0.1 \
     --no-install \
     --no-start \
     --no-ip-check \
     --no-name-check \
     ${NAME}

Install from CD-ROM

Start the Guest VM With the CD-ROM Mounted ==

gnt-instance start -H boot_order=cdrom,cdrom_image_path=/var/iso/ubuntu-14.04.2-server-amd64.iso <your VM name>

Find the Console Port of the Running VM

Then find out on what port the vnc server will appear, 11019 in this case

gnt-instance info meetecho-1.meeting.ietf.org | grep console
  console connection: vnc to vmhost-6.meeting.ietf.org:11019 (display 5119)
    serial_console: default (True)

Tunnel VNC over SSH

From your laptop

ssh -N -L 5900:127.0.0.1:<port from gnt-instance info> <vm-node-for-image>

Do the Install

It should have booted the CD-ROM. Now do the install of the OpSys in your usual fashion.

When it finishes, if you just let it reboot, it will likely just boot the CD-ROM again. So restart the guest by

gnt-instance reboot your.vm.name

Enable Serial Console

It is also smart to enable the serial console in the guest so that the Ganeti host is able to

gnt-instance console your.vm.name

Detailed Configuration

Configure the Network to the Correct IP, Gateway etc.

e /etc/network/interfaces

Fix the hostname

echo "foo.meeting.ietf.org" > /etc/hostname
hostname `cat /etc/hostname`

Fix the timezone in case you made a mistake in install

dpkg-reconfigure tzdata

If you have reconfigured networking to be on the public LAN, then you need to bind the NIC to the public LAN with

gnt-instance modify --net 0:modify,link=br-public your.vm.name

Restart the server from ganeti

gnt-instance reboot foo.meeting.ietf.org

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