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Admin Guide 1. Abiquo: DHCP |
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This page describes the Abiquo DHCP configuration that uses a DHCP server with OMAPI.
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For Abiquo private, external and public networks, the the platform can manage their the corresponding VLANs with an ISC DHCP server.
Abiquo recommends one DHCP server per physical datacenter. Add When you configure the datacenter, add the DHCP service to Abiquo when creating or editing a datacenter. You can use the Remote Services DHCP server supplied with Abiquo or another compatible server.
If you have many virtual networks, you might need a separate relay server to manage VLANs for the DHCP server.
For unmanaged networks only, you do not need to configure a DHCP server and you must provide the network addresses to the
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VMs outside of Abiquo.
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How Abiquo uses DHCP
Abiquo standard VLAN management has the following features:
Virtual networks as separate VLANs
The Cloud Administrator defines VLAN tag pools in Abiquo when creating the racks
External and public networks are created in the infrastructure and defined in Abiquo later
Private networks will be defined by Abiquo from the VLAN tag pools of the racks
The connections in DHCP are as follows:
When you deploy a
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VM, Abiquo (Remotes Services) supplies the network settings for the new VM to the DHCP Server.
When the new
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VM powers on, it broadcasts a DHCP request for network configuration.
The hypervisor passes the DHCP request through a VLAN to the DHCP server.
The DHCP server broadcasts a lease with the network configuration for the
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VM over the same VLAN
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When configuring DHCP for a datacenter using the remote services, the possible DHCP configurations are as followsthe DHCP infrastructure, there are several choices depending on the number of VLANs in the environment.
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DHCP
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server only, for < 200 VLANs.
The
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Server listens to all
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VLANs.
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We recommend using a dedicated DHCP Server for this configuration.
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DHCP
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server with DHCP
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relay, for < 1000 VLANs.
The
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relay server listens
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on all the VLANs and forwards the DHCP requests to the
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Server.
In this configuration you can use the DHCP server on the Remote Services server.
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Do not configure support for VLANs on the DHCP Server.
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DHCP
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server with
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multiple DHCP
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relays, for > 1000 VLANs
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Multiple DHCP relay servers allow you to create large networks in a hierarchical forwarding structure.
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DHCP
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configuration notes
The server managing VLANs must be able to listen to VLANs, so it must be a separate physical machine or a virtual machine on a hypervisor with VLAN support, such as VMware ESXi (see How to configure an ESXi host to support VLAN tagging) or RedHat KVM. a VLAN (DHCP Relay or DHCP Server) must have one interface with IP in the VLAN that will identify the VLAN in the DHCP Server.
To configure a single DHCP server with VLAN support, see Configuring a DHCP Serverserver .
To install a DHCP Relay server with the Abiquo OVA install - appliances see Automatically Configuring One DHCP Relay Serverconfiguring one DHCP relay server .
These configurations are designed for multiple VLAN networks, which by definition have separate VLAN tags and isolate DHCP broadcasts. The server managing VLANs (DHCP Relay or DHCP Server) must have one VNIC or NIC with an IP address for each VLAN that will identify the VLAN to the DHCP Server. The DHCP Server and VM communicate through broadcasts, which are also relayed, until the IP address of the VM is set, so there is no specific requirement for the IP address of the VNIC or NIC. However, it is recommended that the IP address range used for the VNICs or NICs is not part of any other networks. For example, you could use the upper range of the management network. If you have complex requirements, you may need to adapt these configurations.
If you need to use multiple relay servers, see Manually Configuring Multiple DHCP Relay Serversconfiguring multiple DHCP relay servers .