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CloudStack - LinuxFest NorthWest
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CloudStack - LinuxFest NorthWest


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  • 1. David Nalley david@cloudstack.orgTwitter/ @ke4qqq / IRC: ke4qqq in #cloudstack on freenodeBUILDING AN IAAS CLOUD WITHAPACHE CLOUDSTACK
  • 2. Licensing• This presentation and it’s contents unless otherwise noted are released under a Creative Commons Attributions, Share-Alike 3.0 unported license and Apache Software License v2 at your discretion.
  • 3. History• Original company formed - 2008 (VMOps)• Project open sourced (GPLv3) as CloudStack – May 2010• Acquired by Citrix – July 2011• Dropped open core – August 2011• Relicensed under ASL v2 April 3, 2012• Accepted as a Apache incubating project. April 16, 2012
  • 4. What is CloudStack?Open Source Infrastructure as a Service platformthat supports multiple hypervisors, complexnetwork, firewall, load balancer and VPNconfigurations, high availability, in a multi-tenant environment.
  • 5. What does it really do?• Provide separation for the varied tenants• Allocate compute resources in a deterministic manner• Expose to the end user the ability to provision various computing services in a controlled manner (VLAN allocation, firewall rules, load balancer deployment, VM creation, etc)• Manage High Availability• Massively Scalable• Permit the placement of resource limits to be applied• Measuring usage over time
  • 6. Multiple hypervisor support• KVM• XenServer• Xen Cloud Platform• VMware (via vCenter)• Oracle VM• Bare Metal
  • 7. Multi-tenant Separation• Largely built around abstraction from an end-user POV – No interaction with hypervisor directly – No knowledge of underlying storage• Networking separation – Every account has at least one dedicated/isolated VLAN (Tagged Networking) – Layer 3 isolation aka Security Groups for untagged networking• Option to use dedicated hardware
  • 8. Networking• CloudStack has a number of network models• They are generally broken down by: – Method of isolation (VLAN, Security Groups) – Physical hardware or virtual• CloudStack can manage network infrastructure
  • 9. Networking• Services managed by CloudStack – DHCP – VLAN allocation – Firewall – NAT/Port forwarding – Routing – VPN – Load Balancing
  • 10. Networking• CloudStack can also manage physical network hardware (or the virtualized alternatives) – F5-Big IP – NetScaler – Juniper SRX• Additionally you can ‘mix and match’ some network elements as service offerings.
  • 11. Security Groups• Traditional isolation has been via VLAN• VLANs isolate well, but have some problems scaling – Standard has a hard limit of 4096 VLANs – Hardware that can actually keep up with 4096 VLANs is VERY expensive. – Regardless people tend to not like having arbitrary limits on what they can do.• Amazon and others use layer 3 isolation (Security Groups)
  • 12. Security Groups• Assumption of a quasi-trusted Layer 2 network• Typically will only have hypervisors directly connected to that network.• Filtering/isolation occurs at the bridge device (from a Linux perspective – think ebtables)• Deny by default
  • 13. Security Groups
  • 14. Security Groups
  • 15. High Availability• RFMTTR – but apparently HA looks better in marketing slicks and is used that way across the virtualization industry.• CloudStack is not a magical solution for HA – but might be a useful tool in the process to increase availability.• CloudStack will watch for HA-enabled VMs to ensure that they are up, and that the hypervisor it’s on is up – and will restart on another hypervisor if it goes down.• Redundant router
  • 16. Allocation Algorithms• How do you place VMs?, allocate storage, etc.• CloudStack ships with a number of options: – First Fit – Fill first – Disperse – Create your own• Tags• OS Preference
  • 17. Usage• Not billing per se – but does give you something to bill against.• Usage stats show VM count, CPU usage, disk allocation and usage, network usage; all over time.• Lots of integration and howto’s - from Excel spreadsheets to Ubersmith, Amysta, and Cloud Portal.
  • 18. High level Architectural Overview © Copyright David Baird and licensed for reuse under CC-BY license
  • 19. Secondary Storage• Used for storing templates and snapshots• Historically NFS – just added the option of object storage – Technically Swift, but Caringo, GlusterFS and others should work.• Managed by Secondary Storage VM – manages moving templates and snapshots from/to primary storage, aging snapshots out, etc.
  • 20. Primary Storage• In the UI we support NFS, iSCSI, and CLVM.• We can also make use of local storage – No HA, no live migration, etc.• Shared mountpoint – Anything that all the hypervisors can mount and write to.
  • 21. Resource division• We have somewhat arbitrary divisions of resources within CloudStack – Zones • Pods – Clusters
  • 22. Zone• In general practice this is used to designate a specific geographic location.• Shares secondary storage resource across the entire zone• Single network model for the entire zone
  • 23. Pod• In general practice – this is used to refer a rack of machines or a row of racks.• Shares guest network
  • 24. Cluster• This is typically a max of 8-15 machines per cluster and homogenity is enforced: – Same hypervisor (and same version of the hypervisor) – Same CPUs – Same networking (i.e. /dev/eth0 is connected to the same network across all machines)• Primary storage is cluster specific
  • 25. Plethora of Networks• Management Network: Where the hypervisors and management server communicate• Private Network: Default network for system VMs. (virtual router, secondary storage VM, Console proxy VM)• Public Network: The public (often internet-facing network)• Guest Network: The network that VMs are provisioned on.• Link-local network: The RFC 3927 network used for communication between hypervisor and system VMs.
  • 26. Management Server• UI/API pieces are stateless (state is stored in a MySQL database.• All UI functionality is an API call
  • 27. API• RESTful API interface – Unauthenticated API interace on 8096 (for localhost, disabled by default) – Authenticated API interface natively on port 8080 – Responses in XML or JSON – XIkmAHqgRmZzdiXMfaROyK35P_dXxS517WSa9Tmy1H g&command=deployVirtualMachine&serviceofferingi d=1&templateid=291&zoneid=1&signature=eXW%2fxf qx%2fhu%2frMreFksVsp3cT4M%3d
  • 28. UI• Go play with the UI
  • 29. Questions• ASK!
  • 30. Contact•• Docs:• IRC: #cloudstack on Freenode• Twitter/ @cloudstack• Mailing Lists – –• Forums