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From Prasanna Santhanam <...@apache.org>
Subject Re: Installing cloudstack mgmt server on non-Linux OS
Date Thu, 07 Nov 2013 04:34:15 GMT
On Wed, Nov 06, 2013 at 05:29:53PM -0500, Jiri B wrote:
> Hi,
> 
> my attempt is to install cloudstack management server on
> a non-Linux OS (an UNIX-like one). Of course not for production
> setup in this case... :-)

CloudStack is mostly tested on RHEL and Ubuntu. If you are using
something like Arch then you might see surprises. I'm guessing Debian
would work.

> 
> But... I'm not sure I fully understand some basic concepts.
> 
> Are most of the scripts in /usr/share/cloudstack-common/scripts
> used only when cloudstack mgmt server is also acting as
> hypervisor? I see there's a lot of Linux specific commands
> inside scripts (brctl, iptables...).
> 
They are 'packaged' there, but are mostly executed on the hosts and/or
on cloudstack's agents (systemvms, virtual routers etc).  Management
server copies these into hypervisors when they are added (discovered)
to cloudstack. After that cloudstack will only issue commands to
hypervisors and the hypervisor agent will convert the command in to a
script call and execute the required command.

> I also could not find info what is a process of creating
> new VM (when using Linux KVM hypervisor, remote host).
> Does mgmt server need permanent access to storage (NFS), and
> is mgmt server creating new VM image with qemu-img inside
> this storage or does delegate this task to a remote host?
> 
The task is delegated to the KVM hypervisor. CloudStack management
server will send a 'command' to the KVM 'agent' to start a VM when you
use the cloud management UI to launch a virtual machine.

> Hence... the main confusion is how much is management server
> involved in the show. If it is just giving orders (when using
> remote hypervisor), like in RHEVM/oVirt case, and thus the tasks
> are done by cloudstack agent (in KVM hypervisor case)...

Right, it's only handing off commands to remote agents or if you like
it's 'orchestrating' these flows.

> 
> Thank you very much for clarification.
> 
> jirib

-- 
Prasanna.,

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