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Introduction
wrapanapi is a simple virtualization client with support (in varying degrees) for the following
Red Hat Enterprize Virtualization (RHEV)
Red Hat Openstack (RHOS)
Red Hat Openshift
Openshift
VMware vCenter
Microsoft SCVMM
Microsoft Azure
Google Compute Engine
Hawkular
Amazon EC2
It can be used to control virtualization clients and offers operations such as
list_vm (returns a list of vm_names)
list_template (returns a list of templates/images)
start_vm (starts a vm)
stop_vm (stops a vm)
Though conceptually names differ between cloud and infrastructure virtualization technologies (e.g. instance/vm) it was decided to stick to one representation in the codebase and interface to give a singlar API across all systems.
Installation
Wrapanapi can be installed via pip as pip install wrapanapi It is always a good idea to use virtualenv to install pip packages.
For Linux Users, Depending on the distribution you are using, you may need to install following packages (or similar for your distribution of linux):
libcurl-devel
openssl-devel
libxml2-devel
libxml2-static
gcc
If you are in doubt if you really need these packages, you will hit errors during installation that will make it apparent for you to figure out that you need it. Pycurl is a one such package that requires you to install packages like ones listed above, you can read more about it at http://pycurl.io/docs/latest/install.html
Usage
Each management system is invoked usually with a hostname and some credentials
from wrapanapi.virtualcenter import VMWareSystem
system = VMWareSystem(hostname='10.0.0.0', username="root", password="password")
system.list_vm()Adding a new Management System
A management system should extend the Base class, and supply “Not Implemented” raises for items which it doesn’t support. This behaviour may change in the future as more and more diverse management systems.
from base import WrapanapiAPIBase
class RHEVMSystem(WrapanapiAPIBase):
_stats_available = {
'num_vm': lambda self: self.api.get_summary().get_vms().total,
'num_host': lambda self: len(self.list_host()),
'num_cluster': lambda self: len(self.list_cluster()),
'num_template': lambda self: len(self.list_template()),
'num_datastore': lambda self: len(self.list_datastore()),
}
def __init__(self, hostname, username, password, **kwargs):
super(RHEVMSystem, self).__init__(kwargs)The call to super is necessary to set up the logger if noe has not been passed in with the logger keyword.
The developer can then add their own methods to interact with their own management system. Commonly accessible statistics are generally all named the same across management systems. In this way we can treat multiple management systems the same and use an identical method to check the number of vms on a RHEV system, to a VMware system.
Exceptions currently sit in a single module, this will probably change later with each management system having it’s own package and exceptions stored there.
This module was originally developed for assisting in the ManageIQ testing team.
Contributing
The guidelines to follow for this project can be found in the cfme dev_guide.
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