Jan Horacek jhrcz

opennebula addon for dynamic per-vm dns names

this tool allows to have delegated dns domain to opennebula with dns names for every vm.

vm dns names with vmid look like 3456.vms.my.domain.int. additionaly, there are dns names based on vm name with truncated suffix with vmid. this has sideefect for vms with the same base name - it allow having round robin ballancing.

currently we use /etc/hosts.dnsmasq to not interferre with system /etc/hosts. using hosts file has some drawbacks, like nonexistent wildcards.

sample usage

one1c (ETN One Cloud #1) overview 2013

opennebula 3.2.1, preparing for upgrade to 4.x (requires migrating gfs2clvm close to upstream lvm driver, renaming all lvm names )

architecture

8 viritualisation nodes (one1-host-X )

nagios check_cluster generator v2

why

minimize manual configuration
minize notifications from cluster hosts when clustered services are all down (notify only from new fake cluster host)

	#!/bin/bash

	# based on
	# http://arstechnica.com/civis/viewtopic.php?f=16&t=1081335

	echo \"package name\",\"current version\",\"update version\"
	yum -q check-update\| while read i
	do
	i=$(echo $i) #this strips off yum's irritating use of whitespace
	if [ "${i}x" != "x" ]

	# hacky way to apply patch from git generated with format-patch -D
	echo 1 > src/datastore_mad/remotes/lvm/stat.fake
	ln -sf src/datastore_mad/remotes/lvm/stat.fake src/datastore_mad/remotes/lvm/stat
	%patch4 -p1

	#!/bin/bash
	# /usr/local/sbin/kvm-clock-hardsync.sh

	# cron:
	# * * * * * /usr/bin/cronic /usr/local/sbin/kvm-clock-hardsync.sh
	#

	[ "$DEBUG" = "YES" ] \
	&& set -x

	# satisfy any like funkcionality in nginx
	# with client certificat or remote address
	#
	# based on https://sys-notes.com/bin/view/Main/NginxSSLClientAuth
	#

	#if ($ssl_client_s_dn !~ "(O=My Company)") {
	# return 403;
	#}
	set $accessok "";

	#!/bin/bash

	cat /cgroup/blkio/libvirt/qemu/blkio.throttle.read_bps_device
	cat /cgroup/blkio/libvirt/qemu/blkio.throttle.write_bps_device
	cat /cgroup/blkio/libvirt/qemu/*/blkio.throttle.read_bps_device
	cat /cgroup/blkio/libvirt/qemu/*/blkio.throttle.write_bps_device

	# 10MBps
	#BPSLIMIT=10485760