IRAN Community| OpenStack.ir
Agenda:
• Management Network
• Manage IP Addressing
• IP Address Planning
• Iran OpenStack Community
OpenStack Network Design

Network Design

Perquisites before network design
Before beginning, you must plan the number of IP addresses that you need for both  
your guest instances as well as management infrastructure.
Additionally, you must research and discuss cloud network connectivity through  
proxy servers and firewalls.
Today, we will give some examples of network implementations to consider and  
provide information about some of the network layouts that OpenStack uses.  
Finally, we have some brief notes on the networking services that are essential for  
stable operation.

Management Network

Management Network
A management network (a separate network for use by your cloud operators)  
typically consists of a separate switch and separate NICs (network interface cards),  
and is a recommended option.
This segregation prevents system administration and the monitoring of system  
access from being disrupted by traffic generated by guests.

Management Network
Using a virtual local area network (VLAN) works well for these scenarios because it  
provides a method for creating multiple virtual networks on a physical network.
Consider creating other private networks for communication between internal  
components of OpenStack, such as the message queue and OpenStack Compute.

Manage IP Addressing

There are two main types of IP addresses for guest virtual machines:
• Fixed IPs
• Floating IPs
Each instance has a private, Fixed IP address and can also have a public, or Floating  
IP address. Private IP addresses are used for communication between instances,  
and public addresses are used for communication with networks outside the  
cloud, including the Internet.

When you launch an instance, it is automatically assigned a private IP address that  
stays the same until you explicitly terminate the instance. Rebooting an instance  
has no effect on the private IP address. 
 
A pool of floating IP addresses, configured by the cloud administrator, is available  
in OpenStack Compute.

Fixed IP addresses are required, whereas it is possible to run OpenStack without  
floating IPs.  
 
One of the most common use cases for floating IPs is to provide public IP addresses  
to a private cloud, where there are a limited number of IP addresses available.  
 
Another is for a public cloud user to have a static IP address that can be reassigned  
when an instance is upgraded or moved.

IP Address Planning

IP Address Planning
An IP address plan might be broken down into the following sections:
• Subnet router
• Control services public interfaces
• Object Storage cluster internal communications
• Compute and storage communications
• Out of band remote management
• In-band remote management
• Spare space for future growth

Subnet Router
Packets leaving the subnet go via this address, which could be a dedicated router  
or a nova-network service.

Control Services Public Interfaces
Public access to swift-proxy, nova-api, glance-api, and horizon come to these  
addresses, which could be on one side of a load balancer or pointing at individual  
machines.

Object Storage Cluster Internal Communications
Traffic among object/account/container servers and between these and the proxy 
server’s internal interface uses this private network.

Compute and Storage Communications
If ephemeral or block storage is external to the compute node, this network is used.

Out of Band Remote Management
If a dedicated remote access controller chip is included in servers, often these are  
on a separate network.

In-Band Remote Management
Often, an extra (such as 1 GB) interface on compute or storage nodes is used for  
system administrators or monitoring tools to access the host instead of going  
through the public interface.

Spare space For Future Growth
Adding more public-facing control services or guest instance IPs should always  
be part of your plan.

Iran OpenStack Community

Stay in Touch and Join Us:
• Home Page: OpenStack.ir
• Meetup Page: Meetup.com/Iran-OpenStack
• Mailing List: OpenStack-ir@Lists.OpenStack.org
• Twitter: @OpenStackIR , #OpenStackIRAN
• IRC Channel on FreeNode: #OpenStack-ir

Roozbeh Shafiee
Iran OpenStack Community Manager
Roozbeh@OpenStack.ir
OpenStack.ir
Thank You
We need to work together to build a better community

Mastering OpenStack - Episode 12 - Network Design

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