[ovirt-users] Error while using REST API with Ovirt

[Chandrahasa S]

Dear Juan / All,

Thanks for reply.

 I tried to give the hostname with the tag mentioned "host_name". Its 
working.

        So below are the issues still remaining:

        1) The issue of internal server error still persits (rhev manager 
showing issues) even after following the advice of the expert and doing 
the initialization part just once(giving ip and              hostname) 
after creating the vm.

        2) Please confirm if this is the case that  we can do 
initialization part only once on a particular vm , then we can reconfigure 
the network (ip, subnet, gateway etc)
            or not for that vm. 

        3) For Windows guest we are still unable to provide ip details and 
hostname using sysprep/payload.

Error attached.



Regards,
Chandrahasa S



From:   Juan Hernandez <jhernand at redhat.com>
To:     Chandrahasa S <chandrahasa.s at tcs.com>, users at ovirt.org
Cc:     Agarwal Ruchita <agarwal.ruchita at tcs.com>
Date:   09/18/2014 03:35 PM
Subject:        Re: [ovirt-users] Error while using REST API with Ovirt



On 09/18/2014 08:18 AM, Chandrahasa S wrote:
> Dear Experts.
> 
> We are Integrating our internal cloud portal with  Ovirt / RHEVM version
> 3.4.
> 
> We are integrating our internal cloud with Ovirt / RHEVM. VM template
> created using cloud init.
> 
> Through REST API Nippet while codes passes command to template ( with
> cloud init) IP, HOSTNAME, We are able to set IP and Hostname to VM
> through code.
> 
> But post this Manager getting handed. Error code is attached.
> 
> Need your help please.
> 

If I understand correctly you already created a template with the cloud
init configuration, then you created a VM from that template, and you
want to modify it and start it. In order to update the VM you need to
issue a PUT request, and the tag name for the host is "host_name":

    String updateXml =
          "<?xml version=\"1.0\"?>"
        + "<vm>"
        +   "<initialization>"
        +     "<host_name>meghaasadmin.ultimatixuat.net</host_name>"
        +     "<regenerate_ssh_keys>false</regenerate_ssh_keys>"
        +     "<nic_configurations>"
        +       "<nic_configuration>"
        +         "<name>eth0</name>"
        +         "<ip address=\"1.1.1.1\" netmask=\"255.255.255.0\"
gateway=\"13.3.3.3\"/>"
        +         "<boot_protocol>static</boot_protocol>"
        +         "<on_boot>true</on_boot>"
        +       "</nic_configuration>"
        +     "</nic_configurations>"
        +   "</initialization>"
        + "</vm>";
    StringEntity updateEntity = new StringEntity(updateXml);
    HttpPut updateRequest = new HttpPut(apiUrl + "/vms/" + vmId);
    updateRequest.setHeader("Content-Type", "application/xml");
    updateRequest.setHeader("Accept", "application/xml");
    updateRequest.setEntity(updateEntity);
    HttpResponse updateResponse = client.execute(updateRequest);

Then, after the update, you need to start the VM and it will use that
configuration:

    String startXml =
          "<?xml version=\"1.0\"?>"
        + "<action/>";
    StringEntity startEntity = new StringEntity(startXml);
    HttpPost startRequest = new HttpPost(apiUrl + "/vms/" + vmId +
"/start");
    startRequest.setEntity(startEntity);
    startRequest.setHeader("Content-Type", "application/xml");
    startRequest.setHeader("Accept", "application/xml");
    HttpResponse startResponse = client.execute(startRequest);

Some advices:

* Check the XML schema for the structure of the XML documents:

  https://rhevmanager/api?schema

* When sending requests to the RESTAPI makes sure to always explicitly
add the Content-Type and Accept headers:

  yourRequest.setHeader("Content-Type", "application/xml");
  yourRequest.setHeader("Accept", "application/xml");

* Take into account that the initialization with cloud-init will only be
executed the first time you start the VM, so in your tests you will need
to remove the VM and create it again.

* If you are planning to do complex things you may find it helpful the
Java SDK:

  http://www.ovirt.org/Java-sdk

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