Openstack   

Configuration

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Types of openstack Configuration and Deployment

  OpenStack can be deployed OpenStack is of course a culmination of loosely coupled projects that define services. A node is nothing more than a grouping of OpenStack services that run on bare-metal, in a container or virtual machine. The purpose of a node is to provide horizontal scaling and HA. in a single-node or multi-node configuration.

Multi-node Configurations
While single-node configurations are acceptable for small environments, testing or POCs most production environments will require a multi-node configuration for various reasons. As mentioned multi-node configurations group similar OpenStack services and provide scalability as well as the possibility for high availability. One of the great things about OpenStack is the architecture. Every service is decoupled and all communication between services is done through RESTful API endpoints. This is the model architecture for cloud. The advantages are that we have tremendous flexibility in how to build a multi-node configuration. While a few standards have emerged there are many more possible variations and in the end we are not stuck to a rigid deployment model. The standards for deploying multi-node OpenStack are as a two-node, three-node or four-node configuration. 

Two-Node Openstack Configuration
The two-node configuration has a controller and compute node. Here we can easily scale-out compute nodes. Most likely we would run just one controller node or we could setup an active / passive HA configuration for the controller node using Pacemaker. Below is an illustration of a two-node OpenStack configuration: 


Three-Node Openstack Configuration
The three-node configuration has a controller, compute and network node. Here we can easily scale-out compute or network nodes. Most likely we would run just one controller node or we could setup an active / passive HA configuration for the controller node using Pacemaker. In addition we could also setup active / passive configuration for network node to achieve HA and horizontal scaling depending on resource requirements. 


Four-Node Openstack Configuration
The four-node configuration has a controller, compute, network and storage node. Here we can easily scale-out compute, network and storage nodes. Most likely we would run just one controller node or we could setup an active / passive HA configuration for the controller node using Pacemaker. In addition we could also setup active / passive configuration for network and storage nodes to achieve HA as well as horizontal scaling depending on resource requirements. 


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