add dhcp

Signed-off-by: GnomeZworc <nicolas.boufidjeline@g3e.fr>

README.md

@@ -21,7 +21,7 @@ apt-get install -y \
 
 
 ```
-ebtables -L --Lc
+iv
 ebtables -D FORWARD -p arp --arp-op Request --arp-ip-dst 240.0.0.1 -j DROP
 ebtables -A FORWARD -p arp --arp-op Request --arp-ip-dst 240.0.0.1 -j DROP
 ebtables -L --Lc
@@ -29,4 +29,43 @@ ebtables -L --Lc
 genisoimage -output seed.iso -volid cidata -joliet -rock meta-data user-data network-config
 
 socat -,raw,echo=0 unix-connect:/tmp/vm-monitor.sock
+```
+
+```
+root@lab1:~/vm# cat /etc/systemd/system/dnsmasq@.service
+[Unit]
+Description=dnsmasq in netns %i
+After=network.target
+
+[Service]
+Type=simple
+ExecStart=/usr/local/bin/run-dnsmasq-in-netns.sh %i
+ExecStopPost=/bin/rm -f /run/dnsmasq-%i.pid
+
+[Install]
+WantedBy=multi-user.target
+```
+
+```
+#!/bin/bash
+set -e
+
+# Expects one argument: netns_bridge (e.g. vpc-00003_br-00002 or vpc1_br0)
+arg="$1"
+NETNS="${arg%%_*}"
+BRIDGE="${arg#*_}"
+
+echo "start ${NETNS} ${BRIDGE}"
+
+exec ip netns exec "$NETNS" \
+  dnsmasq \
+    --no-daemon \
+    --interface="$BRIDGE" \
+    --bind-interfaces \
+    --pid-file="/run/dnsmasq-$arg.pid" \
+    --conf-file="/etc/dnsmasq.d/$arg.conf" \
+    --no-hosts \
+    --no-resolv \
+    --log-facility="/var/log/dnsmasq-$arg.log" \
+    --no-daemon -p0
 ```