Hello mouadino,
thanks for filing this bug.
This is the expected behavior, every dhcp agent will have a port on a network.
You should take this into account when you create the allocation pool.
If you want to change this behavior I suggest you file a blueprint instead of a
bug.
** Changed in: neutron
Status: New => Opinion
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https://bugs.launchpad.net/bugs/1334323
Title:
Check ips availability before adding network to DHCP agent
Status in OpenStack Neutron (virtual network service):
Opinion
Bug description:
Hi there,
How to reproduce ?
===============
First of all it's better to use HA DHCP agent, i.e. running more than
one DHCP agent, and setting the dhcp_agents_per_network to the number
of DHCP agent that you're running.
Now for the sake of this example let's say that
dhcp_agents_per_network=3.
Now create a network with a subnet /30 for example or big subnet e..g
/24 but with a smaller allocation pool e.g that contain only 1 or 2
ips..
What happen ?
============
A lot of exception start showing up in the logs in the form:
IpAddressGenerationFailure: No more IP addresses available on
network
What happen really ?
================
Our small network was basically scheduled to all DHCP agents that are
up and active and each one of them will try to create a port for him
self, but because our small network has less IPs than
dhcp_agents_per_network, then some of this port will fail to be
created, and this will happen each iteration of the DHCP agent main
loop.
Another case where if you have more than one subnet in a network, and
one of them is pretty small e.g.
net1 -> subnet1 10.0.0.0/24
subnet2 10.10.0.0/30
Than errors also start to happen in every iteration of the dhcp agent.
What is expected ?
===============
IMHO only agent that can handle the network should hold this later,
and a direct call to add a network to a DHCP agent should also fail if
there is no IPs left to satisfy the new DHCP port creation.
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