Two great posts about OpenStack

“cover what I had neglected previously: performance considerations. Here, I will focus solely on the compute part of OpenStack”
Making the most of your application performance on OpenStack Cloud
by Piotr Siwczak

  • Get to know your potential workload
  • Choose the right proportions for OpenStack compute resources
  • Choosing the right hypervisor for OpenStack
  • Hypervisor and guest optimizations
  • Choosing the right compute node
  • Choosing the right user data storage
  • Networking Capacity in OpenStack
  • Avoid “enterpriseness” and shared resources


It turns out that in OpenStack, “controller node” and “compute node” can have variable meanings given how flexibly OpenStack components are deployed
Understanding your options: Deployment topologies for High Availability (HA) with OpenStack
by Piotr Siwczak


  • Endpoint node: This node runs load balancing and high availability services that may include load-balancing software and clustering applications. A dedicated load-balancing network appliance can serve as an endpoint node. A cluster should have at least two endpoint nodes configured for redundancy.
  • Controller node: This node hosts communication services that support operation of the whole cloud, including the queue server, state database, Horizon dashboard, and possibly a monitoring system. This node can optionally host the nova-scheduler service and API servers load balanced by the endpoint node. At least two controller nodes must exist in a cluster to provide redundancy. The controller node and endpoint node can be combined in a single physical server, but it will require changes in configuration of the nova services to move them from ports utilized by the load balancer.
  • Compute node: This node hosts a hypervisor and virtual instances, and provides compute resources to them. The compute node can also serve as the network controller for instances it hosts, if a multihost network scheme is in use. It can also host non-demanding internal OpenStack services, like scheduler, glance-api, etc.
  • Volume node: This is used if you want to use the nova-volume service. This node hosts thenova-volume service and also serves as an iSCSI target.




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