[ovirt-users] Power Management with python SDK

[Giulio Casella]

Hi Juan,

Il 01/12/2015 16:48, Juan Hernández ha scritto:
> On 12/01/2015 03:16 PM, Giulio Casella wrote:
>> Hi everybody,
>> I'm trying to enable power management on a host using python, but I'm stuck.
>>
>> Previously (ovirt 3.5) I directly wrote power management parameters into
>> PowerManagement structure (and everything was working fine), but
>> starting from 3.6 this is not possible.
>>
>> This is what I do now:
>>
>> agent = params.Agent()
>> agent.set_options(params.Options())
>> agent.set_type("ilo3")
>> agent.set_username("admin")
>> agent.set_password("mysecret")
>> agent.set_address("172.20.20.1")
>>
>> agents=params.Agents()
>> agents.add_agent(agent)
>>
>> pm=params.PowerManagement()
>> pm.set_agents(agents)
>> pm.set_enabled(True)
>>
>> myhost=api.hosts.get("myhost")
>> myhost.set_power_management(pm)
>> try:
>> 	myhost.update()
>> except Exception as e:
>> 	print "Error: %s" % e
>>
>> and I get:
>>
>> Error:
>> status: 400
>> reason: Bad Request
>> detail: Cannot edit Host. Power Management is enabled for Host but no
>> Agent type selected.
>>
>>
>> If I dont't enable PM (pm.set_enabled line above) I get no error, but no
>> agent is added.
>>
>> My software is:
>> - ovirt-engine-3.6.0.3-1.el6
>> - ovirt-engine-sdk-python-3.6.0.3-1.el6
>> on a CentOS 6.6 distro.
>>
>> Any ideas?
>>
>> Thanks in advance,
>> Giulio
>
> In 3.6 fencing agents have been converted into a sub-collection of the
> host entity:
>
>    https://.../ovirt-engine/api/hosts/{host:id}/fenceagents
>
> This means that the recommended way to add/remove/update fencing agents
> now in Python is now this:
>
> ---8<---
> # Find the host:
> host = api.hosts.get(name="myhost");
>
> # Enable power management:
> host.get_power_management().set_enabled(True)
> host.update()
>
> # Add the fencing agent:
> agent = params.Agent()
> agent.set_options(params.Options())
> agent.set_type("ilo3")
> agent.set_username("admin")
> agent.set_password("mysecret")
> agent.set_address("172.20.20.1")
> agent.set_order(1);
> host.fenceagents.add(agent)
> --->8---

This piece of code is working, thanks! But only if host.update() is 
called after adding an agent (e.g moving host.update() at the bottom). I 
don't have any fence agent configured before, and setting enabled=True 
and calling update, lead to the 400 HTTP error.

>
> You can use this as a workaround. However the mechanism used in 3.5
> should continue working in 3.6. If it doesn't it is a bug. The script
> that you shared is the one you used in 3.5?
>

In 3.5 I used:

myhost=api.hosts.get("myhost")
pm=params.PowerManagement(type_="ilo3",enabled=True,address="172.20.20.1",username="admin",password="mysecret")
myhost.set_power_management(pm)
myhost.update()

not working in 3.6 (according to bug 
https://bugzilla.redhat.com/show_bug.cgi?id=1118329, marked CLOSED 
WONTFIX, there is no backward compatibility).

Anyway I reached my goal, thank you!

Giulio