Add OVN snap demo

ovn-snap/ovn-sandbox-singlenode.sh

@@ -0,0 +1,84 @@
+#!/bin/bash
+
+# This script lives on:
+# https://github.com/fnordahl/demos/blob/ovn-snap/ovn-snap/ovn-sandbox-singlenode.sh
+#
+# OVN Sandbox example commands freely adapted from:
+# https://github.com/ovn-org/ovn/blob/master/Documentation/tutorials/ovn-sandbox.rst
+#
+# OVN snap snapcraft.yaml source code available at:
+# https://github.com/fnordahl/ovn/tree/snap
+
+set -xe
+# TODO: request snap aliases for these
+NBCTL=ovn.nbctl
+SBCTL=ovn.sbctl
+
+# For the purpose of interactive demo flexibility install Open vSwitch on the
+# host and OVN in a confined snap.  This is possible thanks to snapd interface
+# work done by jamespage.
+sudo apt install -y openvswitch-switch
+sudo snap install --edge ovn
+
+# Allow snap to talk to host Open vSwitch
+snap connect ovn:openvswitch
+
+# Allow host Open vSwitch and/or neighbouring Open vSwitch instances to talk
+# to OVN in the strictly confined snap.
+$SBCTL set-connection ptcp:6642
+
+# Add config to the local OVSDB that the OVN local Controller looks for to talk
+# to OVN
+ovs-vsctl set Open_vSwitch . external-ids:ovn-encap-type=geneve
+ovs-vsctl set Open_vSwitch . external-ids:ovn-encap-ip=127.0.0.1
+ovs-vsctl set Open_vSwitch . external-ids:ovn-remote="tcp:127.0.0.1:6642"
+snap restart ovn.controller
+
+# Create the first logical switch with one port
+$NBCTL ls-add sw0
+$NBCTL lsp-add sw0 sw0-port1
+$NBCTL lsp-set-addresses sw0-port1 "50:54:00:00:00:01 192.168.0.2"
+
+# Create the second logical switch with one port
+$NBCTL ls-add sw1
+$NBCTL lsp-add sw1 sw1-port1
+$NBCTL lsp-set-addresses sw1-port1 "50:54:00:00:00:03 11.0.0.2"
+
+# Create a logical router and attach both logical switches
+$NBCTL lr-add lr0
+$NBCTL lrp-add lr0 lrp0 00:00:00:00:ff:01 192.168.0.1/24
+$NBCTL lsp-add sw0 lrp0-attachment
+$NBCTL lsp-set-type lrp0-attachment router
+$NBCTL lsp-set-addresses lrp0-attachment 00:00:00:00:ff:01
+$NBCTL lsp-set-options lrp0-attachment router-port=lrp0
+$NBCTL lrp-add lr0 lrp1 00:00:00:00:ff:02 11.0.0.1/24
+$NBCTL lsp-add sw1 lrp1-attachment
+$NBCTL lsp-set-type lrp1-attachment router
+$NBCTL lsp-set-addresses lrp1-attachment 00:00:00:00:ff:02
+$NBCTL lsp-set-options lrp1-attachment router-port=lrp1
+
+# Create host userspace interfaces so that we have something familiar to
+# interact with
+ip link add vrf0 type vrf table 1
+ip link set vrf0 up
+ovs-vsctl add-port br-int sw0p1 -- \
+    set Interface sw0p1 external_ids:iface-id=sw0-port1 type=internal
+ip link set sw0p1 addr 50:54:00:00:00:01 vrf vrf0 up
+ip addr add 192.168.0.2/24 dev sw0p1
+ip route add 11.0.0.0/24 via 192.168.0.1 vrf vrf0
+
+ip link add vrf1 type vrf table 2
+ip link set vrf1 up
+ovs-vsctl add-port br-int sw1p1 -- \
+    set Interface sw1p1 external_ids:iface-id=sw1-port1 type=internal
+ip link set sw1p1 addr 50:54:00:00:00:03 vrf vrf1 up
+ip addr add 11.0.0.2/24 dev sw1p1
+ip route add 192.168.0.0/2 via 11.0.0.1 vrf vrf1
+
+# View a summary of the configuration
+printf "\n=== ovn-nbctl show ===\n\n"
+$NBCTL show
+printf "\n=== ovn-nbctl show with wait hv ===\n\n"
+$NBCTL --wait=hv show
+printf "\n=== ovn-sbctl show ===\n\n"
+$SBCTL show