Install Xen 4.2.1 with Remus and DRBD on Ubuntu 12.10

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This example uses two servers, "left" (server #1), and "right" (server #2).

Install a new Ubuntu 12.10 system

Both Servers

Choose 'Use entire disk with LVM', but only use like 15GB for the system to leave the rest for VMs

Network setup

apt-get install bridge-utils
vi /etc/network/interfaces
#
auto xenbr0
iface xenbr0 inet static
address 10.0.1.50
netmask 255.255.255.0
gateway 10.0.1.1
dns-nameservers 10.0.1.1
bridge_ports eth0

auto eth0
iface eth0 inet manual
#
/etc/init.d/networking restart
vi /etc/hosts
#
10.0.1.50 left
10.0.1.51 right
#

Install Xen

Install Xen Pre-requisites

Server #1

Short-cut install for dependencies

apt-get build-dep xen
apt-get install libc6-dev libglib2.0-dev libyajl-dev yajl-tools libbz2-dev bison flex zlib1g-dev git-core texinfo debhelper debconf-utils debootstrap fakeroot

If you're missing something, here's the full list

apt-get install libjpeg-turbo8-dev
apt-get install libvncserver-dev
apt-get install git-core mercurial screen tcpdump minicom ntp ntpdate tree debootstrap bcc bin86 gawk bridge-utils
apt-get install iproute libcurl3 libcurl4-openssl-dev bzip2 module-init-tools transfig tgif texinfo pciutils-dev build-essential make gcc 
apt-get install libc6-dev zlib1g-dev python python-dev python-twisted libncurses5-dev patch libvncserver-dev iasl libbz2-dev 
apt-get install e2fslibs-dev uuid-dev libtext-template-perl autoconf debhelper debconf-utils docbook-xml docbook-xsl dpatch xsltproc rcconf bison flex 
apt-get install gcc-multilib ocaml-findlib libyajl-dev yajl-tools libglib2.0-dev libsdl-ttf2.0-0 libsdl-ttf2.0-dev

Install Xen 4.2.1

Server #1

apt-get install transfig libpixman-1-dev
#latest
apt-get install git-core
git clone git://xenbits.xen.org/xen.git
#release
wget http://bits.xensource.com/oss-xen/release/4.2.1/xen-4.2.1.tar.gz
tar zxvf xen-4.2.1.tar.gz
cd xen-4.2.1
wget http://download.locatrix.com/xen/remus-qdisc-py.patch
patch -p1 < remus-qdisc-py.patch
./configure
vi ./.config
#
PYTHON_PREFIX_ARG=--install-layout=deb
#
make world
make deb

tar zcvf xen-dist.tgz ./xen-4.2.1/dist
scp ./xen-dist.tgz eross@10.0.1.50:.

Server #2

tar zxvf xen-dist.tgz

Both servers

cd /home/eross/xen-4.2.1/dist
./install.sh

update-grub

ls -al /boot/xen*
-rw-r--r-- 1 root root   802303 Jan 30 20:57 /boot/xen-4.2.1.gz
lrwxrwxrwx 1 root root       12 Jan 30 20:57 /boot/xen-4.2.gz -> xen-4.2.1.gz
lrwxrwxrwx 1 root root       12 Jan 30 20:57 /boot/xen-4.gz -> xen-4.2.1.gz
lrwxrwxrwx 1 root root       12 Jan 30 20:57 /boot/xen.gz -> xen-4.2.1.gz
-rw-r--r-- 1 root root 15388780 Jan 30 20:57 /boot/xen-syms-4.2.1

update-rc.d xencommons defaults 19 18
update-rc.d xendomains defaults 21 20
update-rc.d xen-watchdog defaults 22 23

grep Xen /boot/grub/grub.cfg
# You should see "Ubuntu GNU\/Linux, with Xen hypervisor" in there, that's where I got the below from
sed -i 's/GRUB_DEFAULT=.*\+/GRUB_DEFAULT="Ubuntu GNU\/Linux, with Xen hypervisor"/' /etc/default/grub
update-grub

# xen-tools gives you some handy scripts for creating guests
# http://packages.ubuntu.com/quantal/all/xen-tools/filelist
apt-get install libtext-template-perl libconfig-inifiles-perl libfile-slurp-perl liblist-moreutils-perl
wget http://mirror.pnl.gov/ubuntu/pool/universe/x/xen-tools/xen-tools_4.3.1-1_all.deb
dpkg -i xen-tools_4.3.1-1_all.deb

reboot

Optional: Test Xen

Either server

xen-create-image --hostname=ubuntu \
  --memory=512mb \
  --vcpus=2 \
  --lvm=right \
  --dhcp \
  --pygrub \
  --dist=precise

# This may take a few minutes, it's running things and downloading in the background
# See what's going on here in another window:
tail -f /etc/xen/ubuntu.cfg

# Hint: Press Ctrl+] to exit the console view
xl create /etc/xen/ubuntu.cfg -c

# see it running
xl list

# reconnect
xl console ubuntu

Hint: Tapping escape while booting should display grub menu if needed for debugging

Install DRBD

Note: Installs /etc/xen/scripts/block-drbd for xen drbd block support as well

Server #1

apt-get install autoconf build-essential
wget http://remusha.wikidot.com/local--files/configuring-and-installing-remus/drbd-8.3.11-remus.tar.gz
cd ./drbd-8.3.11
./autogen.sh
./configure --prefix=/usr --localstatedir=/var --sysconfdir=/etc --with-km
make
make install
cd drbd
make clean all
make install
vi /etc/modules
# add drbd
#
tar zcvf drbd.tgz ./drbd-8.3.11
scp ./drbd.tgz user@10.0.1.51:.

Server #2

# NOTE: Server #2 must have exactly the same kernel version for you to use the binaries from server #1
# Double-check uname -a on both servers to confirm
tar zxvf ./drbd.tgz
cd ./drbd-8.3.11
make install
vi /etc/modules
# add drbd
#

Both Servers

cp /home/user/drbd-8.3.11/scripts/global_common.conf.protoD /etc/drbd.d/global_common.conf
cp /home/user/drbd-8.3.11/scripts/testvms_protoD.res /etc/drbd.d/SystemHA_protoD.res
uname -a # right
lvcreate -n test -L 10G right
vi /etc/drbd.d/SystemHA_protoD.res
#
resource drbd-vm {
        device /dev/drbd1;
        disk /dev/right/test;
        meta-disk internal;
        on left {
                address 10.0.1.50:7791;
        }
        on right{
                address 10.0.1.51:7791;
        }
}
#

#Create the meta-data for the SystemHA-disk and then bring up the resource. Do this on both machines
drbdadm create-md drbd-vm
###answer y or yes for all questions, in the above command
drbdadm up drbd-vm

###Sanity check. You should see something like this in the output
root@null:~$ cat /proc/drbd 
version: 8.3.9 (api:88/proto:86-95)
GIT-hash: 3ba4fc581d6215744597b3d4c525db276ce000ee build by root@null, 2011-05-14 19:33:56

 1: cs:Connected ro:Secondary/Secondary ds:Inconsistent/Inconsistent D r-----

Server #1 - this will override all of the DRBD data on server #2

drbdadm -- --overwrite-data-of-peer primary drbd-vm

Watch the progress of the transfer (either server)

cat /proc/drbd

Once completed you can continue on.

Notes:

  • You don't need to set the secondary to primary manually. This will be done by the /etc/xen/scripts/block-drbd script. When Remus is running you can do 'cat /proc/drbd' and you'll notice the status will be Primary/Primary
  • When configuring your VM, use drbd:drbd-vm for the disk. not phy:/… or any other format
  • It's one VM per DRBD disk like this, so you have to create a new one for each VM
  • You should do some research on DRBD and dual primary setups. They're potentially hard to manage, so forewarning you now.

Setup Remus

Both servers

vi /etc/xen/xend-config.sxp
# Ensure the following are uncommented
(xend-relocation-server yes)
(xend-relocation-port 8002)
(xend-relocation-address '')
(xend-relocation-hosts-allow '')
#

vi /etc/modules
#
sch_plug
sch_prio
sch_ingress
cls_basic
cls_tcindex
cls_u32
act_mirred
ifb
#

Test VM with Remus

Server #1

pvcreate /dev/drbd1
vgcreate drbdtest /dev/drbd1

xen-create-image --hostname=ubuntu \
  --memory=512mb \
  --vcpus=2 \
  --lvm=drbdtest \
  --dhcp \
  --pygrub \
  --dist=precise

vi /etc/xen/rt.cfg
#
name = "rt"

memory = 256

disk = [ 'drbd:drbd-vm,xvda,w' ]
vif = [' ']

kernel = "/var/lib/xen/images/ubuntu-netboot/vmlinuz"
ramdisk = "/var/lib/xen/images/ubuntu-netboot/initrd.gz"
extra = "debian-installer/exit/always_halt=true -- console=hvc0"
#

xm create /etc/xen/rt.cfg -c
# run the install
sudo ln -s /usr/lib/xen-4.1/bin/pygrub /usr/bin/pygrub
vi  /etc/xen/rt.cfg
# 
bootloader = "pygrub"
# comment out 'kernel' 'ramdisk' and 'extra'
#

# Press Ctrl+] to exit the console view
xl create /etc/xen/rt.cfg -c

# see it running
xl list

# test live migration, if you can't live migrate, then Remus isn't going to work either
xl migrate --live rt right

# try remus ("rt" is the domU, and "right" is the other server, assuming we're running from "left" here)
remus -i 40 rt right

# You should get a whole bunch of these messages:
#
PROF: flushed memory at 1361239602.516625
PROF: suspending at 1361239602.554033
#

Now if you kill the server in some way, the VM will come up automatically on the secondary.