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add comments to the OVS service

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This commit is contained in:
Andreas Martens 2018-07-30 14:42:02 +01:00
parent 88ffcaac3b
commit 7dedaa0344
1 changed files with 27 additions and 7 deletions
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34
daemon/core/services/sdn.py
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@ -51,10 +51,15 @@ class OvsService(SdnService):
cfg = "#!/bin/sh\n"
cfg += "# auto-generated by OvsService (OvsService.py)\n"
cfg += "/etc/init.d/openvswitch-switch start < /dev/null\n"
cfg += "ovs-vsctl add-br ovsbr0\n"
cfg += "ifconfig ovsbr0 up\n"
cfg += "## First make sure that the ovs services are up and running\n"
cfg += "/etc/init.d/openvswitch-switch start < /dev/null\n\n"
cfg += "## create the switch itself, set the fail mode to secure, \n"
cfg += "## this stops it from routing traffic without defined flows.\n"
cfg += "## remove the -- and everything after if you want it to act as a regular switch\n"
cfg += "ovs-vsctl add-br ovsbr0 -- set Bridge ovsbr0 fail-mode=secure\n"
cfg += "\n## Now add all our interfaces as ports to the switch\n"
portnum = 1
for ifc in node.netifs():
if hasattr(ifc, 'control') and ifc.control is True:
continue
@ -62,9 +67,10 @@ class OvsService(SdnService):
ifnum = ifnumstr[0]
# create virtual interfaces
cfg += "## Create a veth pair to send the data to\n"
cfg += "ip link add rtr%s type veth peer name sw%s\n" % (ifnum, ifnum)
cfg += "ifconfig rtr%s up\n" % ifnum
cfg += "ifconfig sw%s up\n" % ifnum
# cfg += "ifconfig rtr%s up\n" % ifnum
# cfg += "ifconfig sw%s up\n" % ifnum
# remove ip address of eths because quagga/zebra will assign same IPs to rtr interfaces
# or assign them manually to rtr interfaces if zebra is not running
@ -81,17 +87,31 @@ class OvsService(SdnService):
raise ValueError("invalid address: %s" % ifcaddr)
# add interfaces to bridge
cfg += "ovs-vsctl add-port ovsbr0 eth%s\n" % ifnum
cfg += "ovs-vsctl add-port ovsbr0 sw%s\n" % ifnum
# Make port numbers explicit so they're easier to follow in reading the script
cfg += "## Add the CORE interface to the switch\n"
cfg += "ovs-vsctl add-port ovsbr0 eth%s -- set Interface eth%s ofport_request=%d\n" % (ifnum, ifnum, portnum)
cfg += "## And then add its sibling veth interface\n"
cfg += "ovs-vsctl add-port ovsbr0 sw%s -- set Interface sw%s ofport_request=%d\n" % (ifnum, ifnum, portnum+1)
cfg += "## start them up so we can send/receive data\n"
cfg += "ovs-ofctl mod-port ovsbr0 eth%s up\n" % ifnum
cfg += "ovs-ofctl mod-port ovsbr0 sw%s up\n" % ifnum
cfg += "## Bring up the lower part of the veth pair\n"
cfg += "ip link set dev rtr%s up\n" % ifnum
portnum += 2
# Add rule for default controller if there is one local (even if the controller is not local, it finds it)
cfg += "\n## We assume there will be an SDN controller on the other end of this, \n"
cfg += "## but it will still function if there's not\n"
cfg += "ovs-vsctl set-controller ovsbr0 tcp:127.0.0.1:6633\n"
cfg += "\n## Now to create some default flows, \n"
cfg += "## if the above controller will be present then you probably want to delete them\n"
# Setup default flows
portnum = 1
for ifc in node.netifs():
if hasattr(ifc, 'control') and ifc.control is True:
continue
cfg += "## Take the data from the CORE interface and put it on the veth and vice versa\n"
cfg += "ovs-ofctl add-flow ovsbr0 priority=1000,in_port=%d,action=output:%d\n" % (portnum, portnum + 1)
cfg += "ovs-ofctl add-flow ovsbr0 priority=1000,in_port=%d,action=output:%d\n" % (portnum + 1, portnum)
portnum += 2