[ovirt-users] Ovirt api function

[Juan Hernandez]

On 08/22/2014 05:58 AM, Shanil S wrote:
> Hi Juan,
> 
> Thanks for your replies..
> 
> Regarding the rebuild VM, Is that any method to reinstall the os on the
> VM without remove it or create a new one?
> 

This is the same that with a physical machine: it all depends on the
facilities that you have available to boot the machine to the re-install
process. You can, for example, set you VM to boot from the network,
using PXE, and use your favorite system (manual setup of TFTP, cobbler,
foreman, etc) to re-install the OS. There are tons of options for this.

However, unless you have data in the VM that you want to preserve, it
may be easier and faster (specially if you are using templates) to
remove it and create a new one.

> 
> -- 
> Regards
> Shanil
> 
> 
> On Thu, Aug 21, 2014 at 4:55 PM, Juan Hernandez <jhernand at redhat.com
> <mailto:jhernand at redhat.com>> wrote:
> 
>     On 08/20/2014 12:42 PM, Shanil S wrote:
>     > Hi,
>     >
>     >
>     > I would like to create the following functions using the ovirt api
>     >
>     > 1. Rebuild VM
> 
>     What do you exactly mean by "rebuild vm"?
> 
>     > 2. Restore the screenthots of one vm to another vm
> 
>     What you can do is create a new VM from an existing snapshot, something
>     like this:
> 
>     #!/bin/sh -ex
> 
>     url="https://ovirt.example.com/ovirt-engine/api"
>     user="admin at internal"
>     password="******"
> 
>     curl \
>     --verbose \
>     --insecure \
>     --request POST \
>     --header "Accept: application/xml" \
>     --header "Content-Type: application/xml" \
>     --user "${user}:${password}" \
>     --data "
>     <vm>
>       <name>myclone</name>
>       <cluster id='00000001-0001-0001-0001-000000000171'/>
>       <snapshots>
>         <snapshot id='f09a98fd-2c7e-40eb-a9ae-6b7f86412bb0'/>
>       </snapshots>
>     </vm>
>     " \
>     "${url}/vms"
> 
>     You need to modify that script with your URL, user name, password,
>     cluster and snapshot id.
> 
>     > 3. Display cpu,network etc usages
>     >
> 
>     The statistics are available in the "statistics" sub-resource. For
>     example, if you want to get the statistics of a host you can do the
>     following:
> 
>     #!/bin/sh -ex
> 
>     url="https://ovirt.example.com/ovirt-engine/api"
>     user="admin at internal"
>     password="******"
> 
>     curl \
>     --verbose \
>     --insecure \
>     --request GET \
>     --header "Accept: application/xml" \
>     --user "${user}:${password}" \
>     "${url}/hosts/40cc4c33-2560-4516-b028-1d59638139c3/statistics"
> 
>     There you will find different statistics, like "memory.total",
>     "memory.used", etc. Take a look. Once you know what statistic you want
>     you can get its details like this:
> 
>     curl \
>     --verbose \
>     --insecure \
>     --request GET \
>     --header "Accept: application/xml" \
>     --user "${user}:${password}" \
>     "${url}/hosts/40cc4c33-2560-4516-b028-1d59638139c3/statistics/7816602b-c05c-3db7-a4da-3769f7ad8896"
> 
>     This can be cumbersome to do with a shell script, so you may want to use
>     the Python or Java SDKs, or just use directly the ovirt-shell:
> 
>     $ ovirt-shell --insecure
>     URL: https://ovirt.example.com/ovirt-engine/api
>     Username: admin at internal
>     Password: ******
>     [oVirt shell (connected)]# show statistic memory.total --host-identifier
>     myhost
>     id                : 7816602b-c05c-3db7-a4da-3769f7ad8896
>     name              : memory.total
>     description       : Total memory
>     host-id           : 40cc4c33-2560-4516-b028-1d59638139c3
>     type              : GAUGE
>     unit              : BYTES
>     values-type       : INTEGER
>     values-value-datum: 2099249152
> 
>     > I couldn't find out any direct api method to do the above, Is it
>     > possible to do these operations using api ? If anyone knows it please
>     > help me to sort out it.
>     >
>     >
>     >
>     > --
>     > Regards
>     > Shanil
> 



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