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authorKarel Kočí <cynerd@email.cz>2016-12-27 12:59:54 +0100
committerKarel Kočí <cynerd@email.cz>2016-12-27 12:59:54 +0100
commitf2f8cf509625c427b07bf52f749df9e1aef45799 (patch)
tree6baea48647d5e7cbe346304405a121347b0ec439
parentce7a67094a300188643511a7794bb555fdce28d1 (diff)
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Implement lxc network setup script
This script prepares bridge for lxc containers.
-rwxr-xr-xlocal/bin/lxc-net40
1 files changed, 40 insertions, 0 deletions
diff --git a/local/bin/lxc-net b/local/bin/lxc-net
new file mode 100755
index 0000000..d7e4a17
--- /dev/null
+++ b/local/bin/lxc-net
@@ -0,0 +1,40 @@
+#!/bin/sh
+
+if [ "$(id -u)" -ne 0 ]; then
+ echo "Root required for execution" >&2
+ exit 1
+fi
+
+# What if we want to clean
+if [ "$1" = "clean" ]; then
+ kill $(cat /tmp/lxc-dhcpd.pid)
+ rm -f /tmp/lxc-dhcpd.pid /tmp/lxc-dhcpd.conf
+ ip link del name vbr0
+fi
+
+# Setup bridge
+ip link add name vbr0 type bridge
+ip link set vbr0 up
+ip addr add 192.168.30.1/24 dev vbr0
+
+# Start dhcp server
+
+# This just takes first dns nameserver configured. Maybe we might want to be
+# little bit more clever.
+DNS_SERVER=$(cat /etc/resolv.conf |grep -i nameserver|head -n1|cut -d ' ' -f2)
+echo "# DHCPD configuration generated by lxc-net script
+authoritative;
+default-lease-time 600;
+max-lease-time 7200;
+option subnet-mask 255.255.255.0;
+option broadcast-address 192.168.30.255;
+option routers 192.168.30.1;
+option domain-name-servers $DNS_SERVER;
+subnet 192.168.30.0 netmask 255.255.255.0 {
+ range 192.168.30.10 192.168.30.100;
+}" > /tmp/lxc-dhcpd.conf
+dhcpd -4 -pf /tmp/lxc-dhcpd.pid -cf /tmp/lxc-dhcpd.conf vbr0
+
+# Setup network forwarding (TODO add -o ethX to iptable command)
+sysctl net.ipv4.ip_forward=1
+iptables -t nat -A POSTROUTING -j MASQUERADE