7.3. Installing guests with PXE

Create a new bridge

1. Create a new network script file in the /etc/sysconfig/network-scripts/ directory. This example creates a file named ifcfg-installation which makes a bridge named installation.

   # cd /etc/sysconfig/network-scripts/
   # vim ifcfg-installation
   DEVICE=installation
   TYPE=Bridge
   BOOTPROTO=dhcp
   ONBOOT=yes
   

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   Warning

   The line, TYPE=Bridge, is case-sensitive. It must have uppercase 'B' and lower case 'ridge'.

   Important

   Prior to the release of Red Hat Enterprise Linux 5.9, a segmentation fault can occur when the bridge name contains only uppercase characters. Please upgrade to 5.9 or newer if uppercase names are required.
2. Start the new bridge by restarting the network service. The ifup installation command can start the individual bridge but it is safer to test the entire network restarts properly.

   # service network restart
   

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3. There are no interfaces added to the new bridge yet. Use the brctl show command to view details about network bridges on the system.

   # brctl show
   bridge name     bridge id               STP enabled     interfaces
   installation    8000.000000000000       no
   virbr0          8000.000000000000       yes
   

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   The virbr0 bridge is the default bridge used by libvirt for Network Address Translation (NAT) on the default Ethernet device.

Add an interface to the new bridge

Intel Corporation Gigabit Network Connection

# Intel Corporation Gigabit Network Connection
DEVICE=eth1
BRIDGE=installation
BOOTPROTO=dhcp
HWADDR=00:13:20:F7:6E:8E
ONBOOT=yes

service network restart

# service network restart

brctl show

# brctl show
bridge name     bridge id               STP enabled     interfaces
installation    8000.001320f76e8e       no              eth1
virbr0          8000.000000000000       yes

Security configuration

iptables -I FORWARD -m physdev --physdev-is-bridged -j ACCEPT
service iptables save
service iptables restart

# iptables -I FORWARD -m physdev --physdev-is-bridged -j ACCEPT
# service iptables save
# service iptables restart

net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

net.bridge.bridge-nf-call-ip6tables = 0
net.bridge.bridge-nf-call-iptables = 0
net.bridge.bridge-nf-call-arptables = 0

sysctl -p /etc/sysctl.conf

# sysctl -p /etc/sysctl.conf

Restart libvirt before the installation

service libvirtd restart

# service libvirtd restart

Select PXE

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Select the bridge

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Start the installation

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