Merge pull request #27280 from taosdata/docs/test-faq

docs: add fqdn in faq and add example in restapi

docs/en/14-reference/05-connectors/60-rest-api.mdx

@@ -448,6 +448,7 @@ Response body:
 
   ```bash
   curl -L -H "Authorization: Basic cm9vdDp0YW9zZGF0YQ==" -d "select * from demo.d1001" 192.168.0.1:6041/rest/sql
+  curl -L -H "Authorization: Taosd /KfeAzX/f9na8qdtNZmtONryp201ma04bEl8LcvLUd7a8qdtNZmtONryp201ma04" -d "select * from demo.d1001" 192.168.0.1:6041/rest/sql
   ```
 
   Response body:
@@ -499,6 +500,7 @@ Response body:
 
   ```bash
   curl -L -H "Authorization: Basic cm9vdDp0YW9zZGF0YQ==" -d "create database demo" 192.168.0.1:6041/rest/sql
+  curl -L -H "Authorization: Taosd /KfeAzX/f9na8qdtNZmtONryp201ma04bEl8LcvLUd7a8qdtNZmtONryp201ma04" -d "create database demo" 192.168.0.1:6041/rest/sql
   ```
 
   Response body:

docs/en/27-train-faq/01-faq.md

@@ -69,7 +69,7 @@ This error indicates that the client could not connect to the server. Perform th
 
 11. You can also use the TDengine CLI to diagnose network issues. For more information, see [Problem Diagnostics](https://docs.tdengine.com/operation/diagnose/).
 
-### 3. How can I resolve the "Unable to resolve FQDN" error?
+### <a id='FQDN'>3. How can I resolve the "Unable to resolve FQDN" error? </a>
 
 Clients and dnodes must be able to resolve the FQDN of each required node. You can confirm your configuration as follows:
 
@@ -164,3 +164,7 @@ For more information, see [taosAdapter](https://docs.tdengine.com/reference/taos
 OOM errors are thrown by the operating system when its memory, including swap, becomes insufficient and it needs to terminate processes to remain operational. Most OOM errors in TDengine occur for one of the following reasons: free memory is less than the value of `vm.min_free_kbytes` or free memory is less than the size of the request. If TDengine occupies reserved memory, an OOM error can occur even when free memory is sufficient.
 
 TDengine preallocates memory to each vnode. The number of vnodes per database is determined by the `vgroups` parameter, and the amount of memory per vnode is determined by the `buffer` parameter. To prevent OOM errors from occurring, ensure that you prepare sufficient memory on your hosts to support the number of vnodes that your deployment requires. Configure an appropriately sized swap space. If you continue to receive OOM errors, your SQL statements may be querying too much data for your system. TDengine Enterprise Edition includes optimized memory management that increases stability for enterprise customers.
+
+### 14. How can I resolve the "some vnode/qnode/mnode(s) out of service" error?
+
+The client has not configured FQDN for all servers. For example, the server has 3 nodes, while the client has only configured FQDN for 1 node. FQDN configuration refer to [How can I resolve the "Unable to resolve FQDN" error?](#FQDN)

docs/zh/14-reference/05-connector/60-rest-api.mdx

@@ -444,6 +444,7 @@ curl http://192.168.0.1:6041/rest/login/root/taosdata
 
   ```bash
   curl -L -H "Authorization: Basic cm9vdDp0YW9zZGF0YQ==" -d "select * from demo.d1001" 192.168.0.1:6041/rest/sql
+  curl -L -H "Authorization: Taosd /KfeAzX/f9na8qdtNZmtONryp201ma04bEl8LcvLUd7a8qdtNZmtONryp201ma04" -d "select * from demo.d1001" 192.168.0.1:6041/rest/sql
   ```
 
   返回值：
@@ -495,6 +496,7 @@ curl http://192.168.0.1:6041/rest/login/root/taosdata
 
   ```bash
   curl -L -H "Authorization: Basic cm9vdDp0YW9zZGF0YQ==" -d "create database demo" 192.168.0.1:6041/rest/sql
+  curl -L -H "Authorization: Taosd /KfeAzX/f9na8qdtNZmtONryp201ma04bEl8LcvLUd7a8qdtNZmtONryp201ma04" -d "create database demo" 192.168.0.1:6041/rest/sql
   ```
 
   返回值：

docs/zh/27-train-faq/01-faq.md

@@ -270,3 +270,6 @@ TDengine 在写入数据时如果有很严重的乱序写入问题，会严重
 
 ### 28 修改database的root密码后，Grafana监控插件TDinsight无数据展示
 TDinsight插件中展示的数据是通过taosKeeper和taosAdapter服务收集并存储于TD的log库中，在root密码修改后，需要同步更新taosKeeper和taosAdapter配置文件中对应的密码信息，然后重启taosKeeper和taosAdapter服务（注：若是集群需要重启每个节点上的对应服务）。
+
+### 29 遇到报错 “some vnode/qnode/mnode(s) out of service” 怎么办？
+客户端未配置所有服务端的 FQDN 解析。比如服务端有 3 个节点，客户端只配置了 1 个节点的 FQDN 解析。FQDN 配置参考：[一篇文章说清楚 TDengine 的 FQDN](https://www.taosdata.com/blog/2020/09/11/1824.html)