Add a small script for setting up the network on a Linux server

1 files changed, 48 insertions, 0 deletions

diff --git a/net.sh b/net.sh
new file mode 100644
index 0000000..2ca1f0c
--- /dev/null
+++ b/net.sh
@@ -0,0 +1,48 @@
+#!/bin/sh
+set -e
+# A short script to setup the network on a server creating bridges for each
+# vlan specified.
+
+# Why? NetworkManager sucks and so do other network utilities. This is simple
+# and fits the need of creating a virtual machine host that can place VMs
+# on any one of the vlans.
+
+defaultrouter="10.9.8.7"
+nameservers="10.11.12.13 10.12.14.16"
+vlan_ifs="eth0 eth1 eth3"
+eth0_vlan_ids="10"
+eth0_vlan_10_inet="10.10.1.2/24"
+eth1_vlan_ids="20 34 38 60 160 240 432"
+eth1_vlan_60_inet="10.60.8.2/24"
+eth3_vlan_ids=50
+eth3_vlan_50_inet="10.50.0.1/24"
+echo="echo"
+
+for if in $vlan_ifs ; do
+	$echo ip link set up $if
+	eval vlan_ids="\$${if}_vlan_ids"
+
+	for id in $vlan_ids; do
+			$echo ip link add link $if name ${if}.${id} type vlan id ${id}
+			$echo brctl addbr vlan${id}
+			$echo brctl addif vlan${id} ${if}.${id}
+			$echo ip link set up ${if}.${id}
+
+			eval inet="\$${if}_vlan_${id}_inet"
+			if ! [ -z "$inet" ] ; then
+				$echo ip -4 addr add "$inet" dev ${if}.${id}.
+			fi
+	done
+done
+
+$echo ip route add default via $defaultrouter
+
+$echo truncate -s 0 /etc/resolv.conf
+for ns in $nameservers ; do
+		if ! [ -z "$echo" ] ; then
+			echo echo nameserver $ns '>>' /etc/resolv.conf
+		else 
+			echo nameserver $ns >> /etc/resolv.conf
+		fi
+done
+