From 9b119e3a938eec39a39985401618a5d29979fc8d Mon Sep 17 00:00:00 2001
From: Randy Bush <randy@psg.com>
Date: Sat, 4 Jul 2020 15:21:45 -0700
Subject: [PATCH] from wiki

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+# Creating a New VM Guest on the BKNIX 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
+```
+
+Now you can create instances a la
+
+```
+gnt-instance add -t plain -o noop
+...
+```
+
+## Create the VM
+
+As I am lazy, I have a script to create a new VM guest
+
+```
+do-add nodeNum diskGB ramGB nameFQDN
+```
+
+This is the script as it is in vm0:~root
+
+```
+#!/bin/sh
+
+# do-add nodeNum diskGB ramGB nameFQDN
+
+DISK=$2
+RAM=$3
+NAME=$4
+NODE=vm$1.bknix.co.th
+
+gnt-instance add \
+     -t plain \
+     -o image+default \
+     -s ${DISK}G \
+     -B maxmem=${RAM}G,minmem=$((${RAM}/2))G \
+     -n $NODE \
+     -H kvm:vnc_bind_address=0.0.0.0 \
+     --no-install \
+     --no-start \
+     --no-ip-check \
+     --no-name-check \
+     ${NAME}
+```
+
+## If You are Lazy and Just Want to Copy the Prototype
+
+Find the image of the source and target images
+
+```
+gnt-instance info proto.bknix.co.th | grep 'on prim'
+gnt-instance info your.vm.name | grep 'on prim'
+dd bs=1024k if=/dev/ganeti/f95c22fc-8061-4402-b276-193875fc6561.disk0 | ssh vm1.bknix.co.th dd of=/dev/ganeti/b295c26a-04a9-46be-a4b9-a5febfd29195.disk0
+```
+
+You can then start your VM
+
+```
+gnt-instance start your.vm.name
+```
+
+Start a console
+
+```
+gnt-instance console your.vm.name
+```
+
+Configure the Network to the Correct IP, Gateway etc.
+
+```
+e /etc/network/interfaces
+```
+
+Fix the hostname
+
+```
+echo "foo.bknix.co.th" > /etc/hostname
+hostname `cat /etc/hostname`
+```
+
+Reconfigure the mail system for the hostname and the correct IP address
+
+```
+dpkg-reconfigure exim4-config
+```
+
+Fix grub for something I forgot <blush?
+
+```
+e /etc/default/grub
+quiet
+update-grub
+```
+
+Enable serial console
+
+```
+e /etc/inittab
+T0:23:respawn:/sbin/getty -L ttyS0 9600 vt100
+```
+
+Make new ssh keys
+
+```
+rm sudo rm -rf /etc/ssh/ssh_host_*
+ssh-keygen -A
+service ssh restart
+```
+
+Fix the timezone
+
+```
+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.bknix.coth
+```
+
+## If you want to build from CD-ROM
+
+Start the Guest VM With the CD-ROM Mounted ==
+
+```
+gnt-instance start -H boot_order=cdrom,cdrom_image_path=/ISOs/debian-7.6.0-i386-netinst.iso <your VM name>
+```
+
+### Find the Console Port of the Running VM
+
+```
+gnt-instance info your.vm.name | grep console
+```
+
+### Tunnel VNC over SSH
+
+From your laptop
+
+```
+ssh -N -L 5900:127.0.0.1:<port from gnt-instance info> your.vm.name
+```
+
+I use a hack
+
+```
+do-link vnc vm0.bknix.co.th 11024
+```
+
+### Run VNC to the Guest VM
+
+From your laptop, use a VNC client to connect to localhost, display 0, password as set for the VM host.
+
+### 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
+```
+
+In FreeBSD, the hack is in /etc/ttys and the baud rate makes no difference.
+
+```
+ttyu0   "/usr/libexec/getty std.9600"   vt100   on  secure
+```
+
+### Install NTP
+
+[Install !NTP in the guest](https://wiki.rg.net/wiki/GuestNTP)
+
+## DRBD Mirror Guest to Cluster
+
+You will likely want the reliability of mirroring the guest to another node in the cluster.  I have a script I use
+
+```
+#!/bin/sh
+# do-drbd guest-name to-node
+gnt-instance shutdown $1
+gnt-instance modify \
+    -t drbd \
+    --no-wait-for-sync \
+    -n $2 \
+    $1
+gnt-instance start $1
+```
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