openstack/openstack-manuals
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[arch-guide] completed work on network services section

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- Minor corrections to previous patch

- Completed TODO items from etherpad in section:
- Updated DNS section
- Added DHCP section
- Added LBaaS secton

Change-Id: I4822ef2792a418fbfad28e1048ae1a1a36d98f8d
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Ben Silverman 2017-08-06 21:49:54 -07:00 committed by Alexandra Settle
parent e3afb934d6
commit b20d62000f
1 changed files with 39 additions and 8 deletions
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doc/arch-design/source/design-networking/design-networking-services.rst
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@ -21,19 +21,50 @@ project <http://www.pool.ntp.org/>`_.
DNS DNS
~~~ ~~~
OpenStack does not currently provide DNS services, aside from the Designate is a multi-tenant DNSaaS service for OpenStack. It provides a REST
dnsmasq daemon, which resides on ``nova-network`` hosts. You could API with integrated keystone authentication. It can be configured to
consider providing a dynamic DNS service to allow instances to update a auto-generate records based on nova and neutron actions. Designate supports a
DNS entry with new IP addresses. You can also consider making a generic variety of DNS servers including Bind9 and PowerDNS.
forward and reverse DNS mapping for instances' IP addresses, such as
``vm-203-0-113-123.example.com.`` The DNS service provides DNS Zone and RecordSet management for OpenStack
clouds. The DNS Service includes a REST API, a command-line client, and a
horizon Dashboard plugin.
For more information, see the `Designate project <https://www.openstack.org/software/releases/ocata/components/designate>`_
web page.
.. note::
The Designate service does not provide DNS service for the OpenStack
infrastructure upon install. We recommend working with your service
provider when installing OpenStack in order to properly name your
servers and other infrastructure hardware.
DHCP DHCP
~~~~ ~~~~
.. TODO OpenStack neutron deploys various agents when a network is created within
OpenStack. One of these agents is a DHCP agent. This DHCP agent uses the linux
binary, dnsmasq as the delivery agent for DHCP. This agent manages the network
namespaces that are spawned for each project subnet to act as a DHCP server.
The dnsmasq process is capable of allocating IP addresses to all virtual
machines running on a network. When a network is created through OpenStack and
the DHCP agent is enabled for that network, DHCP services are enabled by
default.
LBaaS LBaaS
~~~~~ ~~~~~
.. TODO OpenStack neutron has the ability to distribute incoming requests between
designated instances. Using neutron networking and OVS, Load
Balancing-as-a-Service (LBaaS) can be created. The load balancing of workloads
is used to distribute incoming application requests evenly between designated
instances. This operation ensures that a workload is shared predictably among
defined instances and allows a more effective use of underlying resources.
OpenStack LBaaS can distribute load in the following methods:
* Round robin - Even rotation between multiple defined instances.
* Source IP - Requests from specific IPs are consistently directed to the same
instance.
* Least connections - Sends requests to the instance with the least number of
active connections.