# OES Concepts

## **Overview**

OES, as it is designed to work with Spinnaker, will naturally will have a lot of overlap with Spinnaker concepts. We are going to outline the core features of OES (and of Spinnaker below)

OES has two basic features: 

* Application management 
* Application deployment

### Application Deployment

Spinnaker's application deployment feature is responsible for the continuous delivery workflow.  Some of the basic concepts of application deployment are:

* Pipeline 
* Stage 
* Deployment Strategies

Let’s discuss and learn how these concepts work.

#### **Pipeline**

The main deployment management constructor of Spinnaker is the pipeline. A pipeline defines a flow of actions in a particular sequence; for the code traversal, from commit all the way until it is deployed in the target deployment environment. 

A pipeline comprises a series of actions known as stages. You can add/modify stages to a pipeline as you define it, allowing you to pass parameters from one stage to the next along the pipeline. The image below shows an example pipeline.

![](/files/6H0PuaRvjHa9DZTytLZA)

**Stage**

In Spinnaker, an automatically created building block for the pipeline is known as a stage. A stage in a pipeline is used to define a specific and finite activity. Herein, You can specify an action to be performed on a specific pipeline here. You can have as many stages as you wish in a pipeline based on what actions you want to perform; for example, a stage for code build, a stage for static code analysis, a stage for code deploy, etc. 

Spinnaker can integrate with a large number of third third-party tools for performing the actions specified in a pipeline. For example, you can integrate Spinnaker with Jenkins, SonarQube, Terraform, Vault, test automation tools, etc.

#### **Deployment Strategies**

Spinnaker manages cloud-native deployment strategies as exclusive constructs, handling primary arrangements such as disabling old server groups, enabling new server groups, and verifying health checks. Spinnaker backs the red/black (also known as blue/green) strategy, with rolling red/black and canary strategies in active development. This enables the user to define the custom deployment strategy based on their organization requirements.

#### Spinnaker supports:

* Blue/green (AKA Red/Black) 
* Rolling Red/black 
* Highlander 
* Dark Rollout

**Blue/Green (AKA Red/Black):** Blue/Green strategy, AKA Red/black strategy consists of creating new server groups and once the new server groups become healthy, removing the old server groups from the load balancer.

**Highlander:** The highlander strategy consists of creating new server groups and once the new server groups become healthy the old server groups are deleted.

**Dark rollout (None):** Dark roll outs involve doing nothing about the old server groups. Both old and new server groups stay on the load balancer.

Refer to the figure below for a better understanding:

![](/files/qYjstlkEPrngid5m3ibm)


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