f-15: script: add script for running dhcp in netns

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

scripts/run-dnsmasq-in-netns.sh

@@ -0,0 +1,21 @@
+#!/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 dnsmasq ${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

systemd/dnsmasq@.service

@@ -0,0 +1,11 @@
+[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