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From "Jerry Jiang" <>
Subject 答复: The IPaddr parameter for vmcreate API
Date Fri, 26 Apr 2013 08:15:20 GMT
Hello Pranav,

Thanks for your response.

My understanding for how CS allocating IP addresses to vm instance is,
Vrouter works as a dhcp server, and the template for vm is setup to dhcp
When cs tries to create a vm, it picks up an available IP from the IP 
Pool and assign it to targeted vm instance. Am I right?

发件人: Pranav Saxena [] 
发送时间: 2013年4月22日 星期一 18:57
主题: RE: The IPaddr parameter for vmcreate API

Hey Jerry,

Custom ip allocation failure leads to vm deploy failure. Happens in
following cases:
* If ipAddress doesn't exist in the network.
* If requested ip address exists in the network, but already allocated.
* If network model doesn't support custom ip allocation (see list of cases
below), the runtime exception "Does not support custom ip allocation at this
time"  is being thrown.

Custom ip allocation is SUPORTED FOR - 

* Guest Virtual Network
* Direct network in Advanced zone


* ExternalFirewall setup case. The reason for not supporting: the original
ip can be changed automatically by ExternalGuestNetworkGuru after the vm is
* Basic zone - as we have 1 Global Network, but separate ip ranges per each
Pod, so the decision about which ip address to take happens after Allocators
figure out the destination Pod.
If you specify the ip address of Pod2, and allocators will pick up Pod1
- the vm creation will fail.

So you can figure out which case might explain your problem to the best
extent possible.

-----Original Message-----
From: Jerry Jiang []
Sent: Monday, April 22, 2013 3:40 PM
Subject: 答复: The IPaddr parameter for vmcreate API

Anyone has reponsed to the issue, thanks in advance.




发件人: Jerry Jiang []
发送时间: 2013年4月18日 星期四 10:29
收件人: ''
主题: The IPaddr parameter for vmcreate API


Hello all,


I am using cloudstack API to create a VM instance. The IP address as one of
parameters is provided to API

However, I found it didn’t work well, The IP address of creating VM is not
what I provided for API.

Eg, using IP1 as the parameter, the vm operational IP addr is IP2


Why does this issue happen?




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