add-dynamic-changes-to-configs (#1993)

docs-2.0/nebula-operator/8.custom-cluster-configurations/8.1.custom-conf-parameter.md

@@ -8,7 +8,7 @@ Meta, Storage, and Graph services in a NebulaGraph Cluster have their configurat
 
 The structure of `config` is as follows.
 
-```
+```go
 Config map[string]string `json:"config,omitempty"`
 ```
 ## Prerequisites
@@ -56,12 +56,22 @@ The following example uses a cluster named `nebula` and the cluster's configurat
         "auth_type": "password"
   ...
   ```
+
+  To add the `config` for the Meta and Storage services, add `spec.metad.config` and `spec.storaged.config` respectively.
 
 3. Run `kubectl apply -f nebula_cluster.yaml` to push your configuration changes to the cluster.
 
   After customizing the parameters `enable_authorize` and `auth_type`, the configurations in the corresponding ConfigMap (`nebula-graphd`) of the Graph service will be overwritten.
 
+## Modify cluster configurations online
+
+Cluster configurations are modified online by calling the HTTP interface, without the need to restart the cluster Pod.
+
+It should be noted that only when all configuration items in `config` are the parameters that can be dynamically modified at runtime, can the operation of online modifications be triggered. If the configuration items in `config` contain parameters that cannot be dynamically modified, then the cluster configuration will be updated by restarting the Pod.
+
+For information about the parameters that can be dynamically modified for each service, see the parameter table column of **Whether supports runtime dynamic modifications** in [Meta service configuration parameters](../../5.configurations-and-logs/1.configurations/2.meta-config.md), [Storage service configuration parameters](../../5.configurations-and-logs/1.configurations/4.storage-config.md), and [Graph service configuration parameters](../../5.configurations-and-logs/1.configurations/3.graph-config.md), respectively.
+
 ## Learn more
 
-For more information on the configuration parameters of Meta, Storage, and Graph services, see [Configurations](../../5.configurations-and-logs/1.configurations/1.configurations.md).
+For more information about the configuration parameters of Meta, Storage, and Graph services, see [Meta service configuration parameters](../../5.configurations-and-logs/1.configurations/2.meta-config.md), [Storage service configuration parameters](../../5.configurations-and-logs/1.configurations/4.storage-config.md), and [Graph service configuration parameters](../../5.configurations-and-logs/1.configurations/3.graph-config.md).