browse-in-network-namespace.sh

#!/bin/bash

# Variables
LINK='enp0s20f0u4u3'
ADDR='192.168.8.100/24'
NETNS='testns'
BROWSER='chromium-browser'

# Create the network namespace
echo "Creating ${NETNS}" 1>&2
sudo ip netns add $NETNS

# Wait for link to come online
while ! ip link show $LINK >/dev/null 2>&1;
do
	echo "Waiting for ${LINK}..." 1>&2;
	sleep 5;
done

# Configure the interface inside the network namespace
echo "Binding ${LINK} to ${NETNS}" 1>&2
sudo ip link set dev $LINK netns $NETNS

echo "Bringing up ${LINK} in ${NETNS}"
sudo ip netns exec $NETNS \
	ip link set up dev $LINK

echo "Setting ${ADDR} on ${LINK} in ${NETNS}" 1>&2
sudo ip netns exec $NETNS \
	ip addr add $ADDR dev $LINK

# Start the browser inside the network namespace
echo "Starting ${BROWSER} in ${NETNS}" 1>&2
sudo ip netns exec $NETNS \
	su $USER -c ${BROWSER}