6 Installing LVM And A Few Other Needed Packages

node1/node2:

Now we install LVM and some other needed packages:

apt-get install lvm2 ssh bridge-utils iproute iputils-arping fping python2.4 python-twisted-core python-pyopenssl openssl mdadm

You will see this question:

MD arrays needed for the root filesystem: <-- all

7 Reconfiguring The Network For Ganeti

Ganeti relies on Xen running in bridge mode, using a bridge called xen-br0 on dom0. Therefore we have to reconfigure the network on our physical nodes (dom0):

node1:

Edit /etc/network/interfaces and replace the eth0 stanza with a stanza for xen-br0 so that it looks like this:

vi /etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
#allow-hotplug eth0
#iface eth0 inet dhcp
auto xen-br0
iface xen-br0 inet static
        address 192.168.0.100
        netmask 255.255.255.0
        network 192.168.0.0
        broadcast 192.168.0.255
        gateway 192.168.0.1
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0

Then take down eth0 and bring up xen-br0:

ifdown eth0
ifup xen-br0

Afterwards, check that your new bridge is working:

ip a show xen-br0

node1:~# ip a show xen-br0
4: xen-br0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
    link/ether 00:0c:29:d6:b1:55 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.100/24 brd 192.168.0.255 scope global xen-br0
    inet6 fe80::20c:29ff:fed6:b155/64 scope link
       valid_lft forever preferred_lft forever
node1:~#

brctl show xen-br0

node1:~# brctl show xen-br0
bridge name     bridge id               STP enabled     interfaces
xen-br0         8000.000c29d6b155       no              eth0
node1:~#

ifconfig

node1:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:D6:B1:55
          inet6 addr: fe80::20c:29ff:fed6:b155/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:26917 errors:7 dropped:1408 overruns:0 frame:0
          TX packets:1571 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:22665198 (21.6 MiB)  TX bytes:178098 (173.9 KiB)
          Interrupt:17 Base address:0x1400

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:560 (560.0 b)  TX bytes:560 (560.0 b)

xen-br0   Link encap:Ethernet  HWaddr 00:0C:29:D6:B1:55
          inet addr:192.168.0.100  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fed6:b155/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:101 errors:0 dropped:0 overruns:0 frame:0
          TX packets:96 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:6727 (6.5 KiB)  TX bytes:10936 (10.6 KiB)

node1:~#

node2:

Now do the same on node2.example.com:

vi /etc/network/interfaces

# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

# The primary network interface
#allow-hotplug eth0
#iface eth0 inet dhcp
auto xen-br0
iface xen-br0 inet static
        address 192.168.0.101
        netmask 255.255.255.0
        network 192.168.0.0
        broadcast 192.168.0.255
        gateway 192.168.0.1
        bridge_ports eth0
        bridge_stp off
        bridge_fd 0

ifdown eth0
ifup xen-br0

ip a show xen-br0

node2:~# ip a show xen-br0
4: xen-br0: <BROADCAST,MULTICAST,UP,10000> mtu 1500 qdisc noqueue
    link/ether 00:0c:29:d0:19:53 brd ff:ff:ff:ff:ff:ff
    inet 192.168.0.101/24 brd 192.168.0.255 scope global xen-br0
    inet6 fe80::20c:29ff:fed0:1953/64 scope link
       valid_lft forever preferred_lft forever
node2:~#

brctl show xen-br0

node2:~# brctl show xen-br0
bridge name     bridge id               STP enabled     interfaces
xen-br0         8000.000c29d01953       no              eth0
node2:~#

ifconfig

node2:~# ifconfig
eth0      Link encap:Ethernet  HWaddr 00:0C:29:D0:19:53
          inet6 addr: fe80::20c:29ff:fed0:1953/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:9469 errors:8 dropped:3521 overruns:0 frame:0
          TX packets:1655 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:8597242 (8.1 MiB)  TX bytes:183126 (178.8 KiB)
          Interrupt:16 Base address:0x1400

lo        Link encap:Local Loopback
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:8 errors:0 dropped:0 overruns:0 frame:0
          TX packets:8 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:560 (560.0 b)  TX bytes:560 (560.0 b)

xen-br0   Link encap:Ethernet  HWaddr 00:0C:29:D0:19:53
          inet addr:192.168.0.101  Bcast:192.168.0.255  Mask:255.255.255.0
          inet6 addr: fe80::20c:29ff:fed0:1953/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:18 errors:0 dropped:0 overruns:0 frame:0
          TX packets:24 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:1070 (1.0 KiB)  TX bytes:2832 (2.7 KiB)

node2:~#