docs: check and update part of 0.9 docs (#7507)

docs/api_docs/connect_database/connect-database-in-testing-environment.md

@@ -6,9 +6,11 @@ sidebar_position: 2
 sidebar_label: Testing environment
 ---
 
-# Connect database in testing environment
+# Connect database in the testing environment
 
-## Procedure 1. Use kbcli cluster connect command
+## Procedure 1. Use kubectl exec command
+
+If the database address is not required, run the command below to connect to the cluster via the default address.
 
 1. Get the `username` and `password` for the cluster.
 
@@ -22,18 +24,40 @@ sidebar_label: Testing environment
    2gvztbvz
    ```
 
-2. Run the `kubectl exec` command and specify the cluster name to be connected.
+2. Run the `kubectl exec` command and specify the pod to be connected.
 
    ```bash
    kubectl exec -ti -n demo mycluster-mysql-0 -- bash
    ```
 
-The `kubectl exec` command is functional as long as the K8s API server is accessible.
+3. Connect to the cluster.
+
+   ```bash
+   mysql -u root -p2gvztbvz
+   ```
 
 ## Procedure 2. Connect database with CLI or SDK client
 
-You can use `kubectl exec` to connet to this cluster by following the steps in Procedure 1, and then connect to the cluster with the client you prefer.
+For a pod without a client, you can follow the steps below to connect to the cluster. You can also connect to the cluster by other options, like CLI, SDK client, go connection, java connection, etc.
+
+Below is an example of using CLI to connect to the cluster on the local host.
 
-```bash
-kubectl exec -ti -n demo mycluster-mysql-0 -- bash
-```
+1. Get the `username` and `password` for the cluster.
+
+   ```bash
+   kubectl get secrets -n demo mycluster-conn-credential -o jsonpath='{.data.\username}' | base64 -d
+   >
+   root
+
+   kubectl get secrets -n demo mycluster-conn-credential -o jsonpath='{.data.\password}' | base64 -d
+   >
+   2gvztbvz
+   ```
+
+2. Run the command below to connect to the cluster.
+
+   ```bash
+   kubectl port-forward svc/mycluster-mysql 3306:3306 -n demo
+
+   mysql -h 127.0.0.1 -P 3306 -u root -p2gvztbvz
+   ```

docs/api_docs/installation/install-kubeblocks.md

@@ -6,17 +6,20 @@ sidebar_position: 3
 sidebar_label: Install KubeBlocks
 ---
 
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
 # Install KubeBlocks 
 
-KubeBlocks is kubernetes-native, you can use Helm or kubectl with yaml file to install it.
+KubeBlocks is Kubernetes-native, you can use Helm or kubectl with a YAML file to install it.
+
 :::note
 
 If you install KubeBlocks with Helm, to uninstall it, you have to use Helm too.
 
 Make sure you have [kubectl](https://kubernetes.io/docs/tasks/tools/) and [Helm](https://helm.sh/docs/intro/install/) installed.
 :::
 
-
 ## Environment preparation
 
 <table>
@@ -49,24 +52,26 @@ Make sure you have [kubectl](https://kubernetes.io/docs/tasks/tools/) and [Helm]
 ## Installation steps
 
 <Tabs>
-<TabItem value="Helm" label="Install with Helm" default>
 
-### Install with Helm
+<TabItem value="Helm" label="Install with Helm" default>
 
 Use Helm and follow the steps below to install KubeBlocks.
 
-1. Create dependent CRDs.
+1. Create dependent CRDs. Specify the version you want to install.
+
    ```bash
    kubectl create -f https://github.com/apecloud/kubeblocks/releases/download/vx.x.x/kubeblocks_crds.yaml
    ```
 
-2. Add Helm repo.
+2. Add the KubeBlocks Helm repo.
+
    ```bash
    helm repo add kubeblocks https://apecloud.github.io/helm-charts
    helm repo update
    ```
 
 3. Install KubeBlocks.
+
    ```bash
    helm install kubeblocks kubeblocks/kubeblocks --namespace kb-system --create-namespace
    ```
@@ -81,7 +86,7 @@ Use Helm and follow the steps below to install KubeBlocks.
 
    If you want to install KubeBlocks with a specified version, follow the steps below.
 
-   1. View the available versions in [KubeBlocks Release](https://github.com/apecloud/kubeblocks/releases/).
+   1. View the available versions in the [KubeBlocks Release](https://github.com/apecloud/kubeblocks/releases/).
    2. Specify a version with `--version` and run the command below.
 
       ```bash
@@ -95,22 +100,20 @@ Use Helm and follow the steps below to install KubeBlocks.
      :::
 
 </TabItem>
-<TabItem value="kubectl" label="Install with kubectl" default>
 
-### Install with `kubectl`
+<TabItem value="kubectl" label="Install with kubectl">
 
 KubeBlocks can be installed like any other resource in Kubernetes, through a YAML manifest applied via `kubectl`.
 
-
 Run the following command to install the latest operator manifest for this minor release:
 
  ```bash
-   kubectl create -f \address.yaml
-   ```
+ kubectl create -f \address.yaml
+ ```
 
 </TabItem>
-</Tabs>
 
+</Tabs>
 
 ## Verify KubeBlocks installation
 

docs/api_docs/installation/uninstall-kubeblocks.md

@@ -0,0 +1,54 @@
+---
+title: Uninstall KubeBlocks
+description: Handle exception and uninstall KubeBlocks
+keywords: [kubeblocks, exception, uninstall]
+sidebar_position: 5
+sidebar_label: Uninstall KubeBlocks
+---
+
+import Tabs from '@theme/Tabs';
+import TabItem from '@theme/TabItem';
+
+# Uninstall KubeBlocks
+
+Uninstallation order:
+
+1. Delete your cluster if you have created a cluster.
+
+   ```bash
+   kbcli cluster delete <name>
+   ```
+
+2. Uninstall KubeBlocks.
+
+## Uninstall KubeBlocks
+
+<Tabs>
+
+<TabItem value="Helm" label="Helm" default>
+
+Delete all the clusters and resources created before performing the following command, otherwise the uninstallation may not be successful.
+
+```bash
+helm uninstall kubeblocks --namespace kb-system
+```
+
+Helm does not delete CRD objects. You can delete the ones KubeBlocks created with the following commands:
+
+```bash
+kubectl get crd -o name | grep kubeblocks.io | xargs kubectl delete
+```
+
+</TabItem>
+
+<TabItem value="YAML" label="YAML">
+
+You can generate YAMLs from the KubeBlocks chart and uninstall using `kubectl`.
+
+```bash
+helm template kubeblocks kubeblocks/kubeblocks --namespace kb-system | kubectl delete -f -
+```
+
+</TabItem>
+
+</Tabs>