134 lines
4.9 KiB
Text
134 lines
4.9 KiB
Text
4.1. a) and 4.2 a)
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In this setup we will create four virtual machines. Two servers for redundant
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data storage and two clients, each running a dom0.
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Network configuration is done using static IPs:
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server1: 10.0.2.172
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server2: 10.0.2.173
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virt_serv: 10.0.2.174
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client1: 10.0.2.83
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client2: 10.0.2.84
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All of the following is executed by several factors faster after installation
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of kvm for qemu:
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apt-get install qemu-kvm
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The tutorial assumes a 64 bit host. For a 32 bit host, change
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qemu-system-x86_64 to qemu-system-i386 and change amd64 in the installer url to
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i386.
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The tutorial also assumes a Debian host (any release of lenny or newer should
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work) and a working apt-cacher setup. To setup apt-cacher, do:
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apt-get install apt-cacher
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If you dont want to use apt-cacher, you have to adapt the package sources in
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the scripts.
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Get the debian wheezy installer:
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wget http://cdimage.debian.org/cdimage/daily-builds/daily/arch-latest/kfreebsd-amd64/iso-cd/debian-testing-kfreebsd-amd64-businesscard.iso
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Install vde for a userspace switched network between all connected qemu
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instances:
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apt-get install vde2
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And start it (sending it to the background) together with slirp which provides
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connection to the outside using slirp networking (just as qemu user mode
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networking):
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vde_switch -daemon
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slirpvde -dhcp -daemon
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Starting slirp with dhcp enabled is necessary for the debian-installer to
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acquire an initial IP (giving all settings as isolinux arguments is tedious and
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errorprone) and for the domus to get an IP.
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Create two disk images for the two server machines and two for the client
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machines:
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dd if=/dev/zero of=server1.img bs=1 count=1 seek=3000MiB
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dd if=/dev/zero of=server2.img bs=1 count=1 seek=3000MiB
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dd if=/dev/zero of=client1.img bs=1 count=1 seek=3000MiB
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dd if=/dev/zero of=client2.img bs=1 count=1 seek=3000MiB
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Start the machines with these images, giving them all the debian installer
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cdrom and connecting them to the vde network.
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qemu-system-x86_64 -m 256 -hda server1.img -net nic,macaddr=DE:AD:BE:EF:BE:9D -net vde,sock=/tmp/vde.ctl -cdrom debian-testing-amd64-businesscard.iso
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qemu-system-x86_64 -m 256 -hda server2.img -net nic,macaddr=DE:AD:BE:EF:74:E9 -net vde,sock=/tmp/vde.ctl -cdrom debian-testing-amd64-businesscard.iso
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qemu-system-x86_64 -m 256 -hda client1.img -net nic,macaddr=DE:AD:BE:EF:D4:4A -net vde,sock=/tmp/vde.ctl -cdrom debian-testing-amd64-businesscard.iso
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qemu-system-x86_64 -m 256 -hda client2.img -net nic,macaddr=DE:AD:BE:EF:78:01 -net vde,sock=/tmp/vde.ctl -cdrom debian-testing-amd64-businesscard.iso
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The isolinux boot menu will pop up. Choose "Advanced options" and then select
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"Automated install" and press [TAB] to edit the boot commandline. Append the
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preseed url for debconf like this to the end of each of the installers
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respectively:
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preseed/url=http://mister-muffin.de/debian/server1.txt
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preseed/url=http://mister-muffin.de/debian/server2.txt
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preseed/url=http://mister-muffin.de/debian/client1.txt
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preseed/url=http://mister-muffin.de/debian/client2.txt
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Press enter and get yourself a coffee. After everything is finished the
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machines will automatically shut down.
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Now start all machines by using:
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qemu-system-x86_64 -m 256 -hda server1.img -net nic,macaddr=DE:AD:BE:EF:BE:9D -net vde,sock=/tmp/vde.ctl -nographic
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qemu-system-x86_64 -m 256 -hda server2.img -net nic,macaddr=DE:AD:BE:EF:74:E9 -net vde,sock=/tmp/vde.ctl -nographic
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qemu-system-x86_64 -m 1000 -hda client1.img -net nic,macaddr=DE:AD:BE:EF:D4:4A -net vde,sock=/tmp/vde.ctl -nographic
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qemu-system-x86_64 -m 1000 -hda client2.img -net nic,macaddr=DE:AD:BE:EF:78:01 -net vde,sock=/tmp/vde.ctl -nographic
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The two clients get more ram now because they have to host domus.
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A firstboot sysv-init script will initialize drbd on the meta partition for
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both servers and start the synchronization by setting server1 as the primary
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host.
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When this is done, extract a root filesystem of your choice into
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/data/export/vm01 on server1.
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Creating a root filesystem to share via nfs can be done by using debootstrap
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and then manually configuring it [1] or by running xen-create-image, then
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editing /etc/fstab and then putting the result on server1.
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xen-create-image --hostname=vm01 --dir=/root --dhcp --noswap --size=400Mb
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For convenience I did the above and put a tarball with debian wheezy online. On
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server1, do:
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mkdir /data/export/vm01
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wget -O - http://mister-muffin.de/debian/nfs-root-wheezy-amd64.tar | tar -x -C /data/export/vm01
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Username: root
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Password: root
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After the rootfilesystem is in place you can start the domu on client1:
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xm create /etc/xen/vm01.cfg
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And migrate it to client2:
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xm migrate --live vm01 client2
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tadaa! :)
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1/2:
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drbdadm create-md res
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#drbdadm up all
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1:
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#drbdadm -- --do-what-I-say primary all
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drbdadm -- --overwrite-data-of-peer primary all
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#drbdadm -- connect all
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#drbdadm primary
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[1] http://blog.mister-muffin.de/2011/11/21/xen-hypervisor-on-qemu-kvm-and-domu-nfs-boot-with-vde/
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