Hi, I am trying to use Ryu REST applications (ofctl_rest and rest_topology)
in my exam project.
I am not using mininet but an alternative called Kathara that was developed
at my university and it is based on docker.
Whenever I use rest_topolgy /v1.0/topology/links and /v1.0/topology/hosts
endpoints I get back an empty array as answer.
Any other request does work (/stats/switches, /stats/desc/<dpid>,
/v1.0/topology/switches, ...).
So, I suppose the problem is thath the controller does not manage to get
links between switches.
I edited ryu/topology/event.py to print switches and links when
EventSwitchBase and EventLinkBase are called and then I run this command:
*ryu-manager --observe-links --install-lldp-flow
<path-to-ryu>/app/rest_topology.py <path-to-ryu>/app/ofctl_rest.py*
The lines I added to print switches and links produced these lines only:
*Switch<dpid=196548594862159, Port<dpid=196548594862159, port_no=1, DOWN>
Port<dpid=196548594862159, port_no=2, DOWN> Port<dpid=196548594862159,
port_no=3, DOWN> >Switch<dpid=217841702508866, Port<dpid=217841702508866,
port_no=1, DOWN> Port<dpid=217841702508866, port_no=2, DOWN>
>Switch<dpid=56026200183617, Port<dpid=56026200183617, port_no=1, DOWN>
Port<dpid=56026200183617, port_no=2, DOWN> Port<dpid=56026200183617,
port_no=3, DOWN> >*
This information is right but links have not ben printed, so I run the same
command with the original event.py file and the *--verbose *option and I
got this:
*Registered VCS backend: gitRegistered VCS backend: hgRegistered VCS
backend: svnRegistered VCS backend: bzrloading app
/usr/local/lib/python2.7/dist-packages/ryu/app/rest_topology.pyrequire_app:
ryu.topology.switches is required by rest_topologyloading app
/usr/local/lib/python2.7/dist-packages/ryu/app/ofctl_rest.pyloading app
ryu.topology.switchesloading app ryu.controller.ofp_handlerinstantiating
app None of DPSetcreating context dpsetcreating context wsgiinstantiating
app /usr/local/lib/python2.7/dist-packages/ryu/app/ofctl_rest.py of
RestStatsApiinstantiating app ryu.topology.switches of
Switchesinstantiating app ryu.controller.ofp_handler of
OFPHandlerinstantiating app
/usr/local/lib/python2.7/dist-packages/ryu/app/rest_topology.py of
TopologyAPIBRICK switches CONSUMES EventOFPPacketIn CONSUMES
EventOFPStateChange CONSUMES EventHostRequest CONSUMES
EventOFPPortStatus CONSUMES EventLinkRequest CONSUMES
EventSwitchRequestBRICK dpset CONSUMES EventOFPSwitchFeatures CONSUMES
EventOFPPortStatus CONSUMES EventOFPStateChangeBRICK ofp_event PROVIDES
EventOFPPacketIn TO {'switches': set(['main'])} PROVIDES
EventOFPGroupFeaturesStatsReply TO {'RestStatsApi': set(['main'])}
PROVIDES EventOFPTableStatsReply TO {'RestStatsApi': set(['main'])}
PROVIDES EventOFPPortDescStatsReply TO {'RestStatsApi': set(['main'])}
PROVIDES EventOFPStatsReply TO {'RestStatsApi': set(['main'])} PROVIDES
EventOFPQueueGetConfigReply TO {'RestStatsApi': set(['main'])} PROVIDES
EventOFPDescStatsReply TO {'RestStatsApi': set(['main'])} PROVIDES
EventOFPMeterStatsReply TO {'RestStatsApi': set(['main'])} PROVIDES
EventOFPQueueDescStatsReply TO {'RestStatsApi': set(['main'])} PROVIDES
EventOFPAggregateStatsReply TO {'RestStatsApi': set(['main'])} PROVIDES
EventOFPPortStatus TO {'switches': set(['main']), 'dpset': set(['main'])}
PROVIDES EventOFPPortStatsReply TO {'RestStatsApi': set(['main'])}
PROVIDES EventOFPMeterFeaturesStatsReply TO {'RestStatsApi':
set(['main'])} PROVIDES EventOFPStateChange TO {'switches': set(['main',
'dead']), 'dpset': set(['main', 'dead'])} PROVIDES
EventOFPTableFeaturesStatsReply TO {'RestStatsApi': set(['main'])}
PROVIDES EventOFPGroupStatsReply TO {'RestStatsApi': set(['main'])}
PROVIDES EventOFPMeterConfigStatsReply TO {'RestStatsApi': set(['main'])}
PROVIDES EventOFPGroupDescStatsReply TO {'RestStatsApi': set(['main'])}
PROVIDES EventOFPSwitchFeatures TO {'dpset': set(['config']),
'RestStatsApi': set(['main'])} PROVIDES EventOFPFlowStatsReply TO
{'RestStatsApi': set(['main'])} PROVIDES EventOFPQueueStatsReply TO
{'RestStatsApi': set(['main'])} PROVIDES EventOFPRoleReply TO
{'RestStatsApi': set(['main'])} CONSUMES EventOFPEchoReply CONSUMES
EventOFPEchoRequest CONSUMES EventOFPHello CONSUMES EventOFPPortStatus
CONSUMES EventOFPPortDescStatsReply CONSUMES EventOFPSwitchFeatures
CONSUMES EventOFPErrorMsgBRICK TopologyAPIBRICK RestStatsApi CONSUMES
EventOFPGroupFeaturesStatsReply CONSUMES EventOFPDescStatsReply CONSUMES
EventOFPMeterFeaturesStatsReply CONSUMES EventOFPMeterStatsReply CONSUMES
EventOFPQueueStatsReply CONSUMES EventOFPPortStatsReply CONSUMES
EventOFPTableFeaturesStatsReply CONSUMES EventOFPGroupStatsReply CONSUMES
EventOFPMeterConfigStatsReply CONSUMES EventOFPGroupDescStatsReply
CONSUMES EventOFPQueueGetConfigReply CONSUMES EventOFPAggregateStatsReply
CONSUMES EventOFPTableStatsReply CONSUMES EventOFPFlowStatsReply CONSUMES
EventOFPPortDescStatsReply CONSUMES EventOFPSwitchFeatures CONSUMES
EventOFPRoleReply CONSUMES EventOFPStatsReply CONSUMES
EventOFPQueueDescStatsReply(103) wsgi starting up on http://0.0.0.0:8080
<http://0.0.0.0:8080>connected socket:<eventlet.greenio.base.GreenSocket
object at 0x7f43ad9130d0> address:('192.168.100.2', 56980)hello ev
<ryu.controller.ofp_event.EventOFPHello object at 0x7f43ad913690>move onto
config modeconnected socket:<eventlet.greenio.base.GreenSocket object at
0x7f43ad913190> address:('192.168.100.3', 42142)hello ev
<ryu.controller.ofp_event.EventOFPHello object at 0x7f43ad913e10>move onto
config modeconnected socket:<eventlet.greenio.base.GreenSocket object at
0x7f43ad9138d0> address:('192.168.100.4', 49822)hello ev
<ryu.controller.ofp_event.EventOFPHello object at 0x7f43ad923450>move onto
config modeEVENT ofp_event->dpset EventOFPSwitchFeaturesswitch features ev
version=0x4,msg_type=0x6,msg_len=0x20,xid=0x730e260d,OFPSwitchFeatures(auxiliary_id=0,capabilities=79,datapath_id=196548594862159,n_buffers=256,n_tables=254)EVENT
ofp_event->dpset EventOFPSwitchFeaturesswitch features ev
version=0x4,msg_type=0x6,msg_len=0x20,xid=0x425acc6d,OFPSwitchFeatures(auxiliary_id=0,capabilities=79,datapath_id=217841702508866,n_buffers=256,n_tables=254)EVENT
ofp_event->dpset EventOFPSwitchFeaturesswitch features ev
version=0x4,msg_type=0x6,msg_len=0x20,xid=0x47560b86,OFPSwitchFeatures(auxiliary_id=0,capabilities=79,datapath_id=56026200183617,n_buffers=256,n_tables=254)move
onto main modeEVENT ofp_event->switches EventOFPStateChangeEVENT
ofp_event->dpset EventOFPStateChangeDPSET: register datapath
<ryu.controller.controller.Datapath object at
0x7f43ad978cd0><ryu.controller.controller.Datapath object at
0x7f43ad978cd0>register Switch<dpid=196548594862159,
Port<dpid=196548594862159, port_no=1, DOWN> Port<dpid=196548594862159,
port_no=2, DOWN> Port<dpid=196548594862159, port_no=3, DOWN> >move onto
main modeEVENT ofp_event->switches EventOFPStateChangeEVENT
ofp_event->dpset EventOFPStateChangemove onto main modeEVENT
ofp_event->switches EventOFPStateChangeEVENT ofp_event->dpset
EventOFPStateChange<ryu.controller.controller.Datapath object at
0x7f43ad913850>register Switch<dpid=217841702508866,
Port<dpid=217841702508866, port_no=1, DOWN> Port<dpid=217841702508866,
port_no=2, DOWN> ><ryu.controller.controller.Datapath object at
0x7f43ad913590>register Switch<dpid=56026200183617,
Port<dpid=56026200183617, port_no=1, DOWN> Port<dpid=56026200183617,
port_no=2, DOWN> Port<dpid=56026200183617, port_no=3, DOWN> >DPSET:
register datapath <ryu.controller.controller.Datapath object at
0x7f43ad913850>DPSET: register datapath <ryu.controller.controller.Datapath
object at 0x7f43ad913590>(103) accepted ('192.168.100.254', 58408)EVENT
TopologyAPI->switches EventSwitchRequest192.168.100.254 - - [24/Sep/2018
07:52:04] "GET /v1.0/topology/switches HTTP/1.1" 200 1059 0.034508Keyboard
Interrupt received. Closing RYU application manager...*
Here is an example of how I configured the OVS switches:
*service openvswitch-switch startovs-vsctl add-br br0ovs-vsctl add-port br0
eth1ovs-vsctl add-port br0 eth2ovs-vsctl add-port br0 eth3ifconfig eth1
downifconfig eth2 downifconfig eth3 downovs-vsctl set bridge br0
protocols=[OpenFlow13]ovs-vsctl set-controller br0 tcp:192.168.100.1:6633
<http://192.168.100.1:6633>*
*Thanks for support*
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