# 說明

> openstack VM 預設都可以配置一個或多個 ip 地址  
> 假如使用了私有網路, 那麼預設情況下 VM 只具有私有網路 IP 地址, 無法連線外部  
> 針對上述情況, 可以配置外部 IP 地址, 並根據需要配置到 VM 上  
> 我們稱可以進行外部訪問的 IP 地址為浮動 IP  
> 對於 VM 不需要對浮動 IP 進行配置  
> 外部通過訪問浮動 IP 然後再經過 neutron 進行路由至 VM 的私有 IP 地址中  

幫助

[[email protected] ~(keystone_admin)]# nova help | grep float
    add-floating-ip     Add a floating IP address to a server.
    floating-ip-bulk-create
                        Bulk create floating ips by range.
    floating-ip-bulk-delete
                        Bulk delete floating ips by range.
    floating-ip-bulk-list
                        List all floating ips.
    floating-ip-create  Allocate a floating IP for the current tenant.
    floating-ip-delete  De-allocate a floating IP.
    floating-ip-list    List floating ips for this tenant.
    floating-ip-pool-list
                        List all floating ip pools.
    remove-floating-ip  Remove a floating IP address from a server.
 

生成 浮動 IP

[[email protected] ~(keystone_admin)]# nova floating-ip-create pub1
+----------------+-------------+----------+------+
| Ip             | Instance Id | Fixed Ip | Pool |
+----------------+-------------+----------+------+
| 192.168.48.143 | None        | None     | pub1 |
+----------------+-------------+----------+------+
 

分配

[[email protected] ~(network_admin)]# nova add-floating-ip terry_instance1 192.168.48.143

查詢浮動 IP 分配情況

[[email protected] ~(keystone_admin)]# nova floating-ip-list
+----------------+--------------------------------------+-----------+------+
| Ip             | Instance Id                          | Fixed Ip  | Pool |
+----------------+--------------------------------------+-----------+------+
| 192.168.48.143 | 93d0c9c1-b38b-4fe3-9ae3-400f43276f60 | 10.0.0.50 | pub1 |
+----------------+--------------------------------------+-----------+------+
 

移除浮動 IP

[[email protected] ~(keystone_admin)]# nova floating-ip-delete 192.168.48.143