[OSA][NEUTRON] DHCP port IP
Good evening everyone!
I'm using OVS + VLAN Provider
Guys, is there any way to remove IP from DHCP (network:dhcp)?
My gateway is external, I need the VMs to obtain the IPs directly on the interface without using SNAT/DNAT, but when enabling DHCP on the subnet, the DHCP interface consumes an IP (the first one available).
Is there a way to remove this blessed IP? If not, what other path can I take?
I'm thinking of other alternatives: 1. Use static IP 2. Use a DHCP Server on the Gateway (which makes me have to perform some manual operations to assign the correct IP)
What would be more viable?
Thanks in advance!
On Thu, Jul 20, 2023 at 7:18 PM Murilo Morais murilo@evocorp.com.br wrote:
Good evening everyone!
I'm using OVS + VLAN Provider
Guys, is there any way to remove IP from DHCP (network:dhcp)?
You can create a subnet with enable_dhcp=False, then no DHCP port is allocated. Then let Neutron allocate addresses from the subnet range for your VMs (just make sure that the addresses are not reused outside of Neutron).
My gateway is external, I need the VMs to obtain the IPs directly on the
interface without using SNAT/DNAT, but when enabling DHCP on the subnet, the DHCP interface consumes an IP (the first one available).
Is there a way to remove this blessed IP? If not, what other path can I take?
I'm thinking of other alternatives:
- Use static IP
- Use a DHCP Server on the Gateway (which makes me have to perform some
manual operations to assign the correct IP)
What would be more viable?
Thanks in advance!
If the thing that concerns you is that DHCP consumes gateway IP, you should define your gateway when creating the subnet with --gateway option [1].
Also I *think* that if you define --allocation-pool while creating subnet, DHCP server will obtain IP within this pool, but I'm not 100% sure now, as I had such setup years ago.
If you are disabling DHCP, then ensure your VMs will use config-drives for metadata instead of fetching it through the network. For that you will need to supply an option while creating the VM
[1] https://docs.openstack.org/python-openstackclient/latest/cli/command-objects...
On Fri, Jul 21, 2023, 03:24 Ihar Hrachyshka ihrachys@redhat.com wrote:
On Thu, Jul 20, 2023 at 7:18 PM Murilo Morais murilo@evocorp.com.br wrote:
Good evening everyone!
I'm using OVS + VLAN Provider
Guys, is there any way to remove IP from DHCP (network:dhcp)?
You can create a subnet with enable_dhcp=False, then no DHCP port is allocated. Then let Neutron allocate addresses from the subnet range for your VMs (just make sure that the addresses are not reused outside of Neutron).
My gateway is external, I need the VMs to obtain the IPs directly on the
interface without using SNAT/DNAT, but when enabling DHCP on the subnet, the DHCP interface consumes an IP (the first one available).
Is there a way to remove this blessed IP? If not, what other path can I take?
I'm thinking of other alternatives:
- Use static IP
- Use a DHCP Server on the Gateway (which makes me have to perform some
manual operations to assign the correct IP)
What would be more viable?
Thanks in advance!
Dmitiry, thank you very much! config-drive worked like a charm!
Em qui., 20 de jul. de 2023 às 23:08, Dmitriy Rabotyagov < noonedeadpunk@gmail.com> escreveu:
If the thing that concerns you is that DHCP consumes gateway IP, you should define your gateway when creating the subnet with --gateway option [1].
Also I *think* that if you define --allocation-pool while creating subnet, DHCP server will obtain IP within this pool, but I'm not 100% sure now, as I had such setup years ago.
If you are disabling DHCP, then ensure your VMs will use config-drives for metadata instead of fetching it through the network. For that you will need to supply an option while creating the VM
[1] https://docs.openstack.org/python-openstackclient/latest/cli/command-objects...
On Fri, Jul 21, 2023, 03:24 Ihar Hrachyshka ihrachys@redhat.com wrote:
On Thu, Jul 20, 2023 at 7:18 PM Murilo Morais murilo@evocorp.com.br wrote:
Good evening everyone!
I'm using OVS + VLAN Provider
Guys, is there any way to remove IP from DHCP (network:dhcp)?
You can create a subnet with enable_dhcp=False, then no DHCP port is allocated. Then let Neutron allocate addresses from the subnet range for your VMs (just make sure that the addresses are not reused outside of Neutron).
My gateway is external, I need the VMs to obtain the IPs directly on the
interface without using SNAT/DNAT, but when enabling DHCP on the subnet, the DHCP interface consumes an IP (the first one available).
Is there a way to remove this blessed IP? If not, what other path can I take?
I'm thinking of other alternatives:
- Use static IP
- Use a DHCP Server on the Gateway (which makes me have to perform some
manual operations to assign the correct IP)
What would be more viable?
Thanks in advance!
participants (3)
-
Dmitriy Rabotyagov
-
Ihar Hrachyshka
-
Murilo Morais