在某些环境下，PIP是Azure上的一种比较好的解决方案处理一些特殊的环境。比如大量的端口需要打开、向外部的访问非常多等等。
但目前，Azure的Reserved IP address不用应用到PIP上，只能应用到VIP上。
但当用户需要使用PIP，又需要一个固定的连接方式时，我们建议采用DNS域名的方式来实现。
对于一个Azure上的虚拟机：
默认是VIP地址映射虚拟机。但当开启了PIP后，默认向外访问的地址为PIP地址。PIP具体方法见：http://www.cnblogs.com/hengwei/p/4779166.html
此时的PIP是不能预留IP地址的。如果不配置，这个地址也没有默认的DNS域名。如果VM关机等情况，其IP地址更换，将影响客户的应用。
我们可以通过增加PIP DNS域名的方法解决这个问题。
通过Powershell配置：
Get-AzureVM
ServiceName Name Status
----------- ---- ------
hwmysql hwubt1 ReadyRole
get-azurevm -ServiceName hwmysql -Name hwubt1 | set-AzurePublicIP -PublicIPName hwpip -DomainNameLabel hwpip | Update-AzureVM
OperationDescription OperationId OperationStatus
-------------------- ----------- ---------------
Update-AzureVM 785ce71c-c5a6-42f5-84e0-a5dcea6b47b5 Succeeded
get-azurevm -ServiceName hwmysql -Name hwubt1
|
DeploymentName |
hwmysql1 |
|
Name |
hwubt1 |
|
Label |
|
|
VM |
Microsoft.WindowsAzure.Commands.ServiceManagement.Model.PersistentVM |
|
InstanceStatus |
RoleStateUnknown |
|
IpAddress |
10.1.1.100 |
|
InstanceStateDetails |
|
|
PowerState |
Started |
|
InstanceErrorCode |
|
|
InstanceFaultDomain |
0 |
|
InstanceName |
hwubt1 |
|
InstanceUpgradeDomain |
0 |
|
InstanceSize |
Standard_D1 |
|
HostName |
hwubt1 |
|
AvailabilitySetName |
|
|
DNSName |
http://hwmysql.chinacloudapp.cn/ |
|
Status |
RoleStateUnknown |
|
GuestAgentStatus |
Microsoft.WindowsAzure.Commands.ServiceManagement.Model.GuestAgentStatus |
|
ResourceExtensionStatusList |
{} |
|
PublicIPAddress |
42.159.236.183 |
|
PublicIPName |
hwpip |
|
PublicIPDomainNameLabel |
hwpip |
|
PublicIPFqdns |
{hwpip.hwmysql.chinacloudapp.cn hwpip.0.hwmysql.chinacloudapp.cn} |
|
NetworkInterfaces |
{} |
|
VirtualNetworkName |
hwvnet |
|
ServiceName |
hwmysql |
|
OperationDescription |
Get-AzureVM |
|
OperationId |
dac94b4d49994ea292b82499bbb3503c |
|
OperationStatus |
OK |
其中-DomainNameLabel hwpip是指明需要DNS域名的参数，添加了这个参数，可以在get-azurevm中看到这个PIP地址以及关联了hwpip.hwmysql.chinacloudapp.cn的域名。
这时在cmd中解析：
nslookup hwpip.hwmysql.chinacloudapp.cn
Server: xxxx
Address: x.x.x.x
Name: hwpip.hwmysql.chinacloudapp.cn
Address: 42.159.236.183
这时此PIP地址已经可以通过DNS解析到。
我们通过Powershell释放VM的资源：
stop-azurevm -ServiceName hwmysql -Name hwubt1
OperationDescription OperationId OperationStatus
-------------------- ----------- ---------------
Stop-AzureVM 4d9929b7-351e-4452-afd5-7596d6061b75 Succeeded
此时通过get-azurevm可以看到PIP地址以及释放：
|
DeploymentName |
hwmysql1 |
|
Name |
hwubt1 |
|
Label |
|
|
VM |
Microsoft.WindowsAzure.Commands.ServiceManagement.Model.PersistentVM |
|
InstanceStatus |
StoppedDeallocated |
|
IpAddress |
|
|
InstanceStateDetails |
|
|
PowerState |
Stopped |
|
InstanceErrorCode |
|
|
InstanceFaultDomain |
|
|
InstanceName |
hwubt1 |
|
InstanceUpgradeDomain |
|
|
InstanceSize |
Standard_D1 |
|
HostName |
|
|
AvailabilitySetName |
|
|
DNSName |
http://hwmysql.chinacloudapp.cn/ |
|
Status |
StoppedDeallocated |
|
GuestAgentStatus |
|
|
ResourceExtensionStatusList |
{} |
|
PublicIPAddress |
|
|
PublicIPName |
|
|
PublicIPDomainNameLabel |
|
|
PublicIPFqdns |
{} |
|
NetworkInterfaces |
{} |
|
VirtualNetworkName |
hwvnet |
|
ServiceName |
hwmysql |
|
OperationDescription |
Get-AzureVM |
|
OperationId |
6534b10dc6054872a495700ddf7ff49b |
|
OperationStatus |
OK |
通过start-azurevm开机，再观察PIP情况：
|
DeploymentName |
hwmysql1 |
|
Name |
hwubt1 |
|
Label |
|
|
VM |
Microsoft.WindowsAzure.Commands.ServiceManagement.Model.PersistentVM |
|
InstanceStatus |
ReadyRole |
|
IpAddress |
10.1.1.100 |
|
InstanceStateDetails |
|
|
PowerState |
Started |
|
InstanceErrorCode |
|
|
InstanceFaultDomain |
0 |
|
InstanceName |
hwubt1 |
|
InstanceUpgradeDomain |
0 |
|
InstanceSize |
Standard_D1 |
|
HostName |
hwubt1 |
|
AvailabilitySetName |
|
|
DNSName |
http://hwmysql.chinacloudapp.cn/ |
|
Status |
ReadyRole |
|
GuestAgentStatus |
Microsoft.WindowsAzure.Commands.ServiceManagement.Model.GuestAgentStatus |
|
ResourceExtensionStatusList |
{} |
|
PublicIPAddress |
42.159.239.59 |
|
PublicIPName |
hwpip |
|
PublicIPDomainNameLabel |
hwpip |
|
PublicIPFqdns |
{hwpip.hwmysql.chinacloudapp.cn hwpip.0.hwmysql.chinacloudapp.cn} |
|
NetworkInterfaces |
{} |
|
VirtualNetworkName |
hwvnet |
|
ServiceName |
hwmysql |
|
OperationDescription |
Get-AzureVM |
|
OperationId |
945a9299ff6647af8398f2f07fc17b31 |
|
OperationStatus |
OK |
此时再进行DNS解析：
nslookup hwpip.hwmysql.chinacloudapp.cn
Server: xxxx
Address: x.x.x.x
Name: hwpip.hwmysql.chinacloudapp.cn
Address: 42.159.239.59
可以观察到，PIP地址发生变化，但DNS地址没有变。