operator, ns, cr, crd

Author: kaitlynmichael

content/operate/kubernetes/architecture/_index.md

@@ -11,22 +11,57 @@ linkTitle: Architecture
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-Redis Enterprise gives you redis's speed at scale with added durability.
-Kubernetes (K8s) is flexible, scalable, and automates management while reducing overhead. Redis Enterprise for Kubernetes lets you manage your Redis clusters and databases with declarative configuration files, and lets you use the advantages of Kubernetes to manage your resources. Redis Enterprise for Kubernetes uses a custom operator and custom controllers to bring the best of Redis Enterprise to Kubernetes platforms.
-
-Redis Enterprise for Kubernetes provides custom resource definitions (CRDs) that allows you to to create custom resources to manage your clusters and databases. The RedisEnterpriseCluster (REC) resource creates and manages a Redis Enterprise cluster within the same namespace. The RedisEnterpriseDatabase (REDB) resource creates and manages your Redis Enterprise database.
-
-overview diagram
-
-Declarative configuration management... configuration YAML files - https://kubernetes.io/docs/tasks/manage-kubernetes-objects/declarative-config/
-Automated upgrades, creation, scaling, declare state you want and K8s manages details
-where is my database ... just like RS multiple databases are hosted by a redis node, just happens to be within a pod
-db diagram
-Once its up, it's just RS except...
-Credentials management - secrets
-Storage - k8s way - network attached
-Active-active
-multi-namespace
-flexible deployment
-more information?
-https://redis.io/redis-enterprise/advantages/
+Redis Enterprise for Kubernetes gives you the speed and durability of [Redis Enterprise](https://redis.io/redis-enterprise/advantages/), along with the flexibility and ease of use Kubernetes (K8s) provides. Redis Enterprise for Kubernetes uses a custom operator and custom controllers to bring the best of Redis Enterprise to Kubernetes platforms.
+
+The image below illustrates the components of a single-namespace deployment.
+
+{{< image filename="/images/k8s/k8s-arch-v4.png" >}}
+
+## Operator
+
+An operator is a custom extension of the Kubernetes API used to manage complex, stateful processes and resources. The operator uses controllers to manage Redis Enterprise's custom resources (CR).
+
+## Namespace
+
+The Redis Enterprise operator is deployed into a namespace. Only one operator and one RedisEnterpriseCluster can reside in each namespace. Namespaces create a logical separation between resources. Several of the resources used in your deployment are limited to a namespace, while others are cluster-wide.
+
+Redis Enterprise for Kubernetes supports multi-namespace deployment options. Databases residing in one namespace, can be monitored and managed by an operator.
+
+## Custom resources
+
+Custom resources extend the Kubernetes API to allow Redis users to manage their databases the Kubernetes way. Custom resources are created and managed with YAML configuration files.
+
+This [declarative configuration method](https://kubernetes.io/docs/tasks/manage-kubernetes-objects/declarative-config/) lets you define a desired state for your resources, and the operator will make changes to reach that state. This simplifies installing, updating, and scaling (both horizontally and vertically).
+
+The operator continually monitors custom resources for changes, and acts to reconcile differences between your declared desired state and the actual state of your resources.
+
+## Custom resource definitions
+
+A cluster-wide resource called a custom resource defintion (CRD) specifies which settings are configurable via a custom resource configuration file. Any setting not defined by the CRD is not managed by the operator. Changes to these settings can be made just as they are in Redis Enterprise Software.
+
+Settings that are managed by the operator will be overwritten if changed by a method besides the custom resource YAML files. Be aware that changes made in the management UI will be overwritten by the operator if that setting is defined by the CRD.
+
+## RedisEnterpriseCluster REC
+
+## RedisEnterpriseDatabase REDB
+
+{{< image filename="/images/k8s/k8s-node-arch.png">}}
+
+## Active-Active databases
+
+### RedisEnterpriseRemoteCluster RERC
+
+### RedisEnterpriseActiveActiveDatabase REAADB
+
+## Services Rigger
+
+## Security
+
+secrets
+
+## Storage
+
+PVCs, network attached
+
+## Metrics
+