Merge commit '10025f9fa5503865918cbae2af5366afe7fd7c54' as 'components/mycelium'

components/mycelium/scripts/setup_network.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+#
+# A simple shell script to setup a local network using network namespaces. This relies on the presence of the `ip` tool, part of `iproute2` package on linux.
+#
+# Note: this script requires root privilege
+
+set -ex
+
+# Create veth pairs
+ip l add p0 type veth peer p1
+ip l add p2 type veth peer p3
+ip l add p4 type veth peer p5
+ip l add p6 type veth peer p7
+
+# Create bridge
+ip l add mycelium-br type bridge
+
+# Add 1 part of every veth pair in the bridge
+ip l set p1 master mycelium-br
+ip l set p3 master mycelium-br
+ip l set p5 master mycelium-br
+ip l set p7 master mycelium-br
+
+# Add network namespaces
+ip netns add net1
+ip netns add net2
+ip netns add net3
+
+# Enable loopback devices in network namespaces
+ip -n net1 l set lo up
+ip -n net2 l set lo up
+ip -n net3 l set lo up
+
+# Add 1 veth end to every network namespace
+ip l set p2 netns net1
+ip l set p4 netns net2
+ip l set p6 netns net3
+
+# Set underlay IP addresses on the veth parts which are not in the bridge 
+ip a add 10.0.2.1/24 dev p0 
+ip -n net1 a add 10.0.2.2/24 dev p2
+ip -n net2 a add 10.0.2.3/24 dev p4
+ip -n net3 a add 10.0.2.4/24 dev p6
+
+# Set all veth interface to up
+ip l set p0 up
+ip l set p1 up
+ip -n net1 l set p2 up
+ip l set p3 up
+ip -n net2 l set p4 up
+ip l set p5 up
+ip -n net3 l set p6 up
+ip l set p7 up
+
+# Set bridge as up
+ip l set mycelium-br up