License: (CC 3.0) BY-NC-SA
Details
- rest api doesn’t have router-gateway-{set,clear}
- python-quantumclient.quantum.v2_0.router.SetGatewayRouter does the cli api
- quantum_client.add_gateway_router does the actual job
- quantum_client is app.client_manager.quantum
- client_manager is quantumclient.common.clientmanager.ClientManager, it stores token, tenant_id and etc
- quantum is an instance of ClientCache
- quantum is quantumclient.v2_0.client.Client
- add_gateway_router calls self.put(url,body), url holds router id while body holds external_gateway_info including network_id
- put calls self.retry_request(‘PUT’, action, body)
- retry_request calls self.do_request(‘PUT’, action, body)
- do_request will put the action with body to call self.httpclient.do_request
- action = ‘/v2.0’ + ‘/routers/%(router_id)s’ + ‘.json’
- so the quantum has a rest api /v2.0/routers/%(router_id)s.json and accept body={“router”:{“external_gateway_info”:{“network_id”: ext_net_id, “enable_snat”: false}}}
external_gateway_added vs. internal_network_added
- in agent.l3_agent
- external_gateway_added(self, ri, ex_gw_port, interface_name, internal_cidrs)
- internal_network_added(self, ri, network_id, port_id, internal_cidr, mac_address)
external_gateway_added
- force device exists, self.driver.plug
- self.driver.init_l3
- _send_gratutious_arp_packets
- ip netns qrouter-xxx route add default gw gw_ip
internal_network_added
- force device exists, self.driver.plug
- self.driver.init_l3
- _send_gratutious_arp_packets
- internal_network_nat_rules:
snat -s $internal_cidr -j SNAT --to-source $ex_gw_ip - external_gateway_nat_rules:
POSTROUTING ! -i $interface_name ! -o $interface_name -m conntrack ! --ctstate DNAT -j ACCEPT, include internal_network_nat_rules
routers_updated mainly invoke _process_routers which just remove routers no longer exist
__router_added(router_id, router)
- add router info to cache: self.router_info
- create namespace if needed
- handle metadata filter and nat rules
- ri.iptables_manager.apply()
- handle metadata proxy if needed