【neutron原始碼分析】create_network/create_subnet/create_port原始碼分析
- 指定了subnet和fixed IP，執行NeutronDbPluginV2._allocate_specific_ip
- 指定了subnet，未指定fixed IP，執行self._generate_ip程式碼
主要是查詢neutron資料庫中的ipavailabilityranges表獲取IP的範圍，然後分配IP後，更新ipavailabilityranges表。
[neutron]> SELECT * FROM ipavailabilityranges;
+--------------------------------------+----------------+----------------+
| allocation_pool_id | first_ip | last_ip |
+--------------------------------------+----------------+----------------+
| a5818bca-e7b5-4399-a405-a6a095800281 | 10.10.10.11 | 10.10.10.254 |
| a5818bca-e7b5-4399-a405-a6a095800281 | 10.10.10.2 | 10.10.10.9 |
IP分配完畢後，則將被分配了的IP更到neutron資料庫的ipallocations表。
[neutron]> SELECT * FROM ipallocations;
+--------------------------------------+----------------+--------------------------------------+--------------------------------------+
| port_id | ip_address | subnet_id | network_id |
+--------------------------------------+----------------+--------------------------------------+--------------------------------------+
| 07130e1c-a6d4-4f28-843c-33b1e07b223e | 10.248.144.102 | 5eb54ff1-25a7-4ffd-87c8-99e492701f15 | c4206574-8125-41e6-be09-5a624dadb570 |
| dba288c4-3c63-4af3-87fc-929166d072e6 | 10.10.10.10 | 90cf42a5-61e5-4684-a9a3-ed241f8a00fb | 01978067-94f2-4758-b124-b33413a9d9f2 |
+--------------------------------------+----------------+--------------------------------------+--------------------------------------+