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Re: Single IP Pool and Multiple Tenant



Thanks for your reply,

Yeh I had some misunderstand about Floating IPs.

Now is this possible I can create floating ip from dashboard/horizon?



On Sat, Feb 2, 2013 at 9:33 PM, Vishvananda Ishaya <vishvananda@xxxxxxxxx>wrote:

> On Feb 1, 2013, at 8:24 PM, Umar Draz <unix.co@xxxxxxxxx> wrote:
> > So this is not possible that create a dedicated floating ip pools that
> share all tenant.
> >
> > I have 128 ip pools and different tenant, I don't want a tenant hold the
> ip even if its not needed. I want a central pool every tenant should
> acquire the ip address from that pool.
> >
> > Br.
> >
> > Umar
> This is exactly what is happening. I think you have a basic
> misunderstanding of how floating ips work. The purpose of a floating ip is
> to be able to move it from one server to another (hence the term floating).
> A project therefore must explicitly reserve an ip before using it and
> unreserve it when it is finished. The reserve command is:
> nova floating-ip-create
> # returns an <address>
> This will pick an address from the pool and reserve it for the project.
> The project is then free to associate it with a server:
> nova add-floating-ip <server> <address>
> If the project then wants to remove the floating ip:
> nova remove-floating-ip <server> <address>
> And associate it with another server:
> nova add-floating-ip <other-server> <address>
> When the project is done with the floating ip it should unreserve it
> (which returns it to the pool):
> nova floating-ip-delete <address>
> In the cloud world instances are ephemeral. Floating ips are designed to
> last beyond the length of an individual server. Note that the reservation
> is necessary so that:
>  a) a user knows a floating ip that he/she can use
>  b) another user doesn't 'steal' the floating ip during the remove/add
> process.
> This is the standard way that floating ips work (and is equivalent to
> elastic ips in aws) so it shouldn't be hard to explain to your users to do
> it this way.
> You could modify the code in various ways to automatically
> reserve/unreserve ips for you, but I think this will be very confusing and
> annoying to your users. One possible compromize is to have a periodic db
> check for ips that haven't been used for a while and automatically return
> them to the pool.
> It seems like what you really want is:
>  auto_assign_floating_ip=True # automatically assign a floating ip to
> every instance
> This saves the users from having to do any manual management of floating
> ips. It sounds like you don't really want "floating" ips anyway.
> Vish

Umar Draz
Network Architect

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