Update Reconfigure Docs (#609)

Signed-off-by: Shaad7 <[email protected]>

docs/examples/redis/reconfigure/rdops-inline-reconfig.yaml

@@ -0,0 +1,11 @@
+apiVersion: ops.kubedb.com/v1alpha1
+kind: RedisOpsRequest
+metadata:
+  name: rdops-inline-reconfig
+  namespace: demo
+spec:
+  type: Reconfigure
+  databaseRef:
+    name: sample-redis
+  configuration:
+    inlineConfig: maxclients 3000

docs/examples/redis/reconfigure/rdops-reconfigure.yaml

@@ -0,0 +1,12 @@
+apiVersion: ops.kubedb.com/v1alpha1
+kind: RedisOpsRequest
+metadata:
+  name: rdops-reconfigure
+  namespace: demo
+spec:
+  type: Reconfigure
+  databaseRef:
+    name: sample-redis
+  configuration:
+    configSecret:
+      name: new-custom-config

docs/examples/redis/reconfigure/sample-redis-config.yaml

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+apiVersion: kubedb.com/v1alpha2
+kind: Redis
+metadata:
+  name: sample-redis
+  namespace: demo
+spec:
+  version: "6.2.14"
+  storageType: Durable
+  storage:
+    storageClassName: "standard"
+    accessModes:
+      - ReadWriteOnce
+    resources:
+      requests:
+        storage: 1Gi
+  configSecret:
+    name: rd-custom-config

docs/guides/redis/reconfigure/_index.md

@@ -0,0 +1,10 @@
+---
+title: Reconfigure
+menu:
+  docs_{{ .version }}:
+    identifier: rd-reconfigure
+    name: Reconfigure
+    parent: rd-redis-guides
+    weight: 46
+menu_name: docs_{{ .version }}
+---

docs/guides/redis/reconfigure/overview.md

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+---
+title: Reconfiguring Redis
+menu:
+  docs_{{ .version }}:
+    identifier: rd-reconfigure-overview
+    name: Overview
+    parent: rd-reconfigure
+    weight: 10
+menu_name: docs_{{ .version }}
+section_menu_id: guides
+---
+
+> New to KubeDB? Please start [here](/docs/README.md).
+
+# Reconfiguring Redis
+
+This guide will give an overview on how KubeDB Ops-manager operator reconfigures `Redis` database.
+
+## Before You Begin
+
+- You should be familiar with the following `KubeDB` concepts:
+  - [Redis](/docs/guides/redis/concepts/redis.md)
+  - [RedisOpsRequest](/docs/guides/redis/concepts/redisopsrequest.md)
+
+## How Reconfiguring Redis Process Works
+
+The following diagram shows how KubeDB Ops-manager operator reconfigures `Redis` database components. Open the image in a new tab to see the enlarged version.
+
+<figure align="center">
+  <img alt="Reconfiguring process of Redis" src="/docs/images/day-2-operation/redis/rd-reconfigure.svg">
+<figcaption align="center">Fig: Reconfiguring process of Redis</figcaption>
+</figure>
+
+The Reconfiguring Redis process consists of the following steps:
+
+1. At first, a user creates a `Redis` Custom Resource (CR).
+
+2. `KubeDB` operator watches the `Redis` CR.
+
+3. When the operator finds a `Redis` CR, it creates required number of `StatefulSets` and related necessary stuff like secrets, services, etc.
+
+4. Then, in order to reconfigure the `Redis` database the user creates a `RedisOpsRequest` CR with desired information.
+
+5. `KubeDB` Ops-manager operator watches the `RedisOpsRequest` CR.
+
+6. When it finds a `RedisOpsRequest` CR, it halts the `Redis` object which is referred from the `RedisOpsRequest`. So, the `KubeDB` Provisioner  operator doesn't perform any operations on the `Redis` object during the reconfiguring process.  
+
+7. Then the `KubeDB` Ops-manager operator will replace the existing configuration with the new configuration provided or merge the new configuration with the existing configuration according to the `RedisOpsRequest` CR.
+
+8. Then the `KubeDB` Ops-manager operator will restart the related StatefulSet Pods so that they restart with the new configuration defined in the `RedisOpsRequest` CR.
+
+9. After the successful reconfiguring of the `Redis` components, the `KubeDB` Ops-manager operator resumes the `Redis` object so that the `KubeDB` Provisioner  operator resumes its usual operations.
+
+In the next docs, we are going to show a step by step guide on reconfiguring Redis database components using `RedisOpsRequest` CRD.