每个租户对应着一个router，每个L3 Agent运行在一个network namespace中，而namespace命名为qrouter-$router-uuid，Agent主要负责router，dhcp，nat等管理工作
$ neutron router-list
+--------------------------------------+---------+-----------------------------------------------------------------------------+
| id | name | external_gateway_info |
+--------------------------------------+---------+-----------------------------------------------------------------------------+
| 41f2f732-3574-48fb-923f-7fa3b9dc6f0c | router1 | {"network_id": "8956472f-0245-4447-bafe-374287d49156", "enable_snat": true} |
+--------------------------------------+---------+-----------------------------------------------------------------------------+
namespace为qrouter-41f2f732-3574-48fb-923f-7fa3b9dc6f0c，那么就可以查看namespace的相关信息
$ sudo ip netns exec qrouter-41f2f732-3574-48fb-923f-7fa3b9dc6f0c ip a
1: lo: mtu 65536 qdisc noqueue state UNKNOWN group default
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
18: qr-e242edbc-aa: mtu 1500 qdisc noqueue state UNKNOWN group default
link/ether fa:16:3e:b0:3b:9c brd ff:ff:ff:ff:ff:ff
inet 10.0.0.1/24 brd 10.0.0.255 scope global qr-e242edbc-aa
valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:feb0:3b9c/64 scope link
valid_lft forever preferred_lft forever
19: qg-119953bc-6f: mtu 1500 qdisc noqueue state UNKNOWN group default
link/ether fa:16:3e:bf:4f:c3 brd ff:ff:ff:ff:ff:ff
inet 172.24.4.226/28 brd 172.24.4.239 scope global qg-119953bc-6f
valid_lft forever preferred_lft forever
inet6 fe80::f816:3eff:febf:4fc3/64 scope link
valid_lft forever preferred_lft forever
这里interface的地址都是连接router的subnet的gateway地址，比如查询下
lihui@lihui-devstack:~$ neutron port-list | grep 172.24.4.226
| 119953bc-6f9f-4616-9401-aa6f2bbce805 | | fa:16:3e:bf:4f:c3 | {"subnet_id": "37a98a23-8025-48fc-a606-8bc1406843a6", "ip_address": "172.24.4.226"} |
lihui@lihui-devstack:~$ neutron port-show 119953bc-6f9f-4616-9401-aa6f2bbce805
+-----------------------+-------------------------------------------------------------------------------------+
| Field | Value |
+-----------------------+-------------------------------------------------------------------------------------+
| admin_state_up | True |
| allowed_address_pairs | |
| binding:capabilities | {"port_filter": false} |
| binding:host_id | lihui-devstack |
| binding:profile | {} |
| binding:vif_type | binding_failed |
| device_id | 41f2f732-3574-48fb-923f-7fa3b9dc6f0c |
| device_owner | network:router_gateway |
| extra_dhcp_opts | |
| fixed_ips | {"subnet_id": "37a98a23-8025-48fc-a606-8bc1406843a6", "ip_address": "172.24.4.226"} |
| id | 119953bc-6f9f-4616-9401-aa6f2bbce805 |
| mac_address | fa:16:3e:bf:4f:c3 |
| name | |
| network_id | 8956472f-0245-4447-bafe-374287d49156 |
| port_security_enabled | |
| security_groups | |
| status | ACTIVE |
| support_azs | |
| tenant_id | |
+-----------------------+-------------------------------------------------------------------------------------+
比如有哪个子网出了问题，就可以监听gateway来判断哪部分出了问题，当然，先得查询网关在哪个物理节点上
~$ neutron l3-agent-list-hosting-router 41f2f732-3574-48fb-923f-7fa3b9dc6f0c +--------------------------------------+-------------------+----------------+-------+ | id | host | admin_state_up | alive | +--------------------------------------+-------------------+----------------+-------+ | e6a321fa-06a4-4851-bc21-1310187f785f | lihui-devstack | True | xxx | +--------------------------------------+-------------------+----------------+-------+
好吧，我自己L3都挂了，还好是个小demo机器~！
