Open Stack

keyStone :
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Authentication, Autherization for users, services, end points.
It uses tokens to authenticate and maintain session information.

Tenants are logically seperated containers within your openstack cloud.

Glance:
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Used to store and manage guest images.
Images can be managed globally and per tenant
Users can be mange do upload specific images

Nova:
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Compute platform to run guest machines
boots instances from our glance images
Multi-Hypervisor Support
Currently require seperate nova instanaces per hypervisor
Nova is our management platform per hypervisor

* Regions are logical group of openstack services
*Availability zones are group of open stack nova end points based on location
*Aggregates are group of openstack nova endpoints based on characteristics like SSD backed, 10Gbe

Nova Networking:

Networking inside Nova provides great feature set of traditional virtualised networking
- L2/L3, DHCP

Different types of IP networks are supported with NOVA

- Flat Networking
      Dedicated subnet with ip information injected while booting
- Flat DHCP
     Allocated ip addresses to instances from a dedicated subnet using dnsmasq
-VLAN Manager
     Tenant is allocated a VLAN and IP range

Floating IP address while talking to public addresses