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Openstack meetup-pune-aug22-overview


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Openstack meetup-pune-aug22-overview

  1. 1. OpenStack Overview Compiled by Rajdeep Dua
  2. 2. What is OpenStack Provide scalable, elastic cloud computing for both public and private clouds, large and small
  3. 3. Defining OpenStack • OpenStack is a virtualization platform which abstracts out Compute, Storage and Networking from the underlying Hardware • All the components are managed through a central Dashboard
  4. 4. OpenStack Components
  5. 5. OpenStack - Components Component Component Function Definition Nova Compute Provides virtual servers on demand Glance Image Service Provides a catalog of images used to create VMs Swift Object Storage Provides Object Storage Horizon Web based UI Provides a way to interact with other OpenStack services Quantum Networking Service Provides Network as a Service Cinder Block Storage Service Provides Block Storage Service for guest VMs Keystone Identity Services Provides Authorization and Authentication services for
  6. 6. OpenStack Components..
  7. 7. OpenStack – Compute • Tool to orchestrate cloud. • Main Functions – Manage running instances – Manage access to the cloud through users and tenants • OpenStack compute relies in the underlying hypervisors to spawn actual instances
  8. 8. OpenStack Computes • Hypervisors Supported Hypervisor KVM Kernel Virtual Machine Xen Based on Citrix Xen Server vSphere 4.1, 5.1 VMWare’s hypervisor QEMU Quick Emulator LXC Linux Containers : User Control Packages for Linux Containers
  9. 9. Users and Tenants • OpenStack Compute is designed to be multi tenant – Role Based Access Assignment – Quotas to control resource consumption are on a per tenant basis • Tenants are containers of resources – Contain :VLANs, Users, volumes, instances, images
  10. 10. Images and Instances • Images are templates of VM File Systems • Instances are Virtual Machines running on Physical Compute Nodes
  11. 11. Instance Creation
  12. 12. Storage Types in Compute • Ephemeral Storage – Persistent storage on a local Compute Node – Deleted with the instance – Persisted across reboots of the VM • Volume Storage – Independent of the Instance – Block Storage – Attached to an instance – Not shared among instances
  13. 13. OpenStack Block Storage • Provides Persistent Block Storage to be attached to the Virtual Machines • Similar to EBS in Amazon EC2 • Not a NFS • By Default it uses Cinder- Volume Backend storage Service • Supports concept of a Volume and a Snapshot
  14. 14. Multi Volume Support in Cinder
  15. 15. OpenStack Object Storage..1/2 • Provides a mechanism to store Object in Containers • Accounts and Account Servers • Container Servers • Object Storage Servers
  16. 16. OpenStack Object Storage..2/2
  17. 17. What is Quantum • Networking service to virtualize Network Management • Quantum is to networking what Nova for Compute
  18. 18. Pluggin Architecture of OpenStack Networking • Open Stack Networking Follows a Pluggin approach for the implementation of the APIs. • Default implementation is with Open vSwitch but there a host of implementations from third party vendors
  19. 19. Quantum – Pluggin Architecture
  20. 20. Quantum – Networking Topology
  21. 21. Identity Service • Provides services for – Identity : Provide Auth Validation and Data about users – Token : Validates and Manages Tokens – Catalog : Provides and Endpoint Registry – Policy : Rules Based authorization Engine
  22. 22. Keystone
  23. 23. Summary • Open Stack is a hypervisor agnostic cloud management software which can help implement public and private clouds
  24. 24. Quantum - Overview Compiled by Rajdeep Dua
  25. 25. What is Quantum • Networking service to virtualize Network Management • Quantum is to networking what Nova for Compute
  26. 26. Why Quantum • Enterprise Networks are complex • Traditional Open Stack Networking has limitations • New Concepts like SDN and Tunneling protocols need a more extendible model
  27. 27. Limitations of Nova-Network • Single VLAN for all the VMs • Limited by the number of VLANs which can be created – 4096 • Little or No Control
  28. 28. Quantum • Provides tools and control for Enterprise class Networking – Services Firewalls, Load Balancers, Virtual Routers • Provide APIs to build advanced network Configurations
  29. 29. Challenges from Cloud on Networking • Massive Scale • Cost Effective • Vendor Agnostic • Dynamic and programmatic configuration
  30. 30. Quantum • Embrace New technologies like SDN / Open Flow • Programmable Network • Overcome limitation of Nova-Network • Pluggin mechanism for multiple downstream APIs
  31. 31. Quantum Basics • Provides API for configuration of Virtual Networks and connecting VMs • Connect Virtual and Physical Switches • Provide Pluggin mechanism for different control components.
  32. 32. Quantum API Abstractions • Network • Subnet • Ports
  33. 33. Quantum Basics (by analogy to Nova) Nova Quantum *-as-a-service Compute Network Major API abstractions “virtual servers”: represents a host with CPU, memory, disk, and NICs. “virtual networks”: A basic L2 network segment. “virtual ports”: Attachment point for devices connecting to virtual networks. Interactions with other OpenStack services. virtual servers use “virtual images” from Glance. virtual ports are linked to vNICs on “virtual servers”. Supports different back-end technologies “virt-drivers” for KVM, XenServer, Hyper-V, VMWare ESX “plugins” for Open vSwitch Cisco UCS, Linux Bridge, Nicira NVP API Extensibility for new or back-end specific features. keypairs, instance rescue, volumes, etc. quality-of-service, port statistics, security groups, etc.
  34. 34. API Abstractions Net1 Nova Quantum virtual network virtual port virtual server virtual interface (VIF) VM1 VM2
  35. 35. Quantum Rest API Abstraction Details • Virtual Networks: – Equivalent to a “virtual VLAN”, a dedicated L2 segment. – Example:<tenant-id>/network/<network- id> • Virtual Ports: – Where a virtual interface (e.g., Nova vNIC) attaches to a network. – Ports expose configuration and monitoring state via extensions (e.g., ACLs, QoS policies, Packet Statistics) – Example:<tenant-id>/network/<network- id>/port/<port-id>
  36. 36. Old Model: Static Nova Networking Public Net • Single network exists (per-project or global). • VMs automatically get a vNIC on that single network on boot. • Tenants have no control over IP addressing. TenantA-VM1 TenantB-VM1 TenantA-VM2 TenantA-VM3
  37. 37. Quantum Model: Dynamic Network Creation + Association • Tenant can use API to create many networks. • When booting a VM, define which network(s) it should connect to. • Can even plug-in instances from other services (e.g., a load-balancing service). Public Net Tenant-A Net1 Tenant-A Net2 TenantA-VM1 TenantA-VM2 TenantA-VM3
  38. 38. Quantum API Abstractions : Network • Layer 2 Broadcast domain • It is the main entity : Subnets and Ports associated with a Network • Identified by a uuid • Always associated with a tenant • No of networks which can be created by a tenant is configurable
  39. 39. Quantum API Abstractions : Subnet • An IP Address block from which IP Addresses are assigned • Always associated with a CIDR • Subnet is always associated with a Network • Can also optionally have a gateway, a list of dns name servers, and host routes
  40. 40. Quantum API Abstractions : Port • Virtual Switch Port attached to a Virtual Switch • Associated with a mac address and an IP Address • Port is Associated with a Subnet
  41. 41. Network-Subnet-port
  42. 42. Quantum Server, Agent Interaction
  43. 43. Quantum Create a VM Flow
  44. 44. Quantum Principles • Implementation Abstraction : Networking implementation at Physical level is abstracted • Association of an Interface with a Network is an explicit step • Plugins can expose extensions from the core APIs
  45. 45. Plugin Architecture • Allows Network/Port abstraction with multiple implementations – Process All API Calls and pass them to the underlying Physical Layer – Manage Virtual Switches – Triggered by Nova interfaces being attached to a network
  46. 46. Quantum-Plugin-Nova Interaction
  47. 47. Quantum Plugins • Open Source plugins based on OpenVSwitch and Linux bridge – hardware Independent • Vendors plugins – Cisco – Brocade – Nicira (VMware) – BigSwitch Networks
  48. 48. Key Takeaways • Quantum enables advanced networking in Open Stack – APIs to configure advanced network topologies – Pluggin architecture for extensibility
  49. 49. Key Takeaways • Quantum enables advanced networking in Open Stack – APIs to configure advanced network topologies – Pluggin architecture for extensibility