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94 lines
2.1 KiB
Bash
94 lines
2.1 KiB
Bash
#!/bin/bash
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# Print some usage info
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function usage {
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echo "Usage: $0 [OPTION] [host_ip]"
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echo "Set up temporary networking for LXC"
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echo ""
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echo " -n, --dry-run Just print the commands that would execute."
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echo " -h, --help Print this usage message."
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echo ""
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exit
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}
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# Allow passing the ip address on the command line.
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function process_option {
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case "$1" in
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-h|--help) usage;;
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-n|--dry-run) dry_run=1;;
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*) host_ip="$1"
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esac
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}
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# Set up some defaults
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host_ip=
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dry_run=0
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bridge=br0
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DRIER=
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# Process the args
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for arg in "$@"; do
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process_option $arg
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done
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if [ $dry_run ]; then
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DRIER=echo
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fi
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if [ "$UID" -ne "0" ]; then
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echo "This script must be run with root privileges."
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exit 1
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fi
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# Check for bridge-utils.
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BRCTL=`which brctl`
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if [ ! -x "$BRCTL" ]; then
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echo "This script requires you to install bridge-utils."
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echo "Try: sudo apt-get install bridge-utils."
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exit 1
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fi
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# Scare off the nubs.
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echo "====================================================="
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echo
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echo "WARNING"
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echo
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echo "This script will modify your current network setup,"
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echo "this can be a scary thing and it is recommended that"
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echo "you have something equivalent to physical access to"
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echo "this machine before continuing in case your network"
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echo "gets all funky."
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echo
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echo "If you don't want to continue, hit CTRL-C now."
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if [ -z "$host_ip" ];
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then
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echo "Otherwise, please type in your host's ip address and"
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echo "hit enter."
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echo
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echo "====================================================="
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read host_ip
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else
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echo "Otherwise hit enter."
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echo
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echo "====================================================="
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read accept
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fi
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# Add a bridge interface, this will choke if there is already
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# a bridge named $bridge
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$DRIER $BRCTL addbr $bridge
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$DRIER ip addr add 192.168.1.1/24 dev $bridge
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if [ $dry_run ]; then
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echo "echo 1 > /proc/sys/net/ipv4/ip_forward"
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else
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echo 1 > /proc/sys/net/ipv4/ip_forward
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fi
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$DRIER ifconfig $bridge up
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# Set up the NAT for the instances
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$DRIER iptables -t nat -A POSTROUTING -s 192.168.1.0/24 -j SNAT --to-source $host_ip
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$DRIER iptables -I FORWARD -s 192.168.1.0/24 -j ACCEPT
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