How Do I Access an MRS Cluster from a Node Outside the Cluster?

Creating a Linux ECS Outside the Cluster to Access the MRS Cluster

Create an ECS outside the cluster.
Set AZ, VPC, and Security Group of the ECS to the same values as those of the cluster to be accessed.

On the VPC management console, apply for an EIP and bind it to the ECS.
Configure security group rules for the cluster.
1. On the Dashboard tab page, click Add Security Group Rule. In the Add Security Group Rule dialog box that is displayed, click Manage Security Group Rule.
2. Click the Inbound Rules tab, and click Add Rule. In the Add Inbound Rule dialog box, configure the IP address of the ECS and enable all ports.
3. After the security group rule is added, you can download and install the client on the ECS..
4. Use the client.
  Log in to the client node as the client installation user and run the following command to switch to the client directory:
  
  cd /opt/hadoopclient
  
  Run the following command to load environment variables:
  
  source bigdata_env
  
  If Kerberos authentication is enabled for the cluster, run the following command to authenticate the user. If Kerberos authentication is disabled for the current cluster, authentication is not required.
  
  kinit MRS cluster user
  
  Example:
  
  kinit admin
  
  Run the client command of a component.
  
  Example:
  
  Run the following command to view files in the HDFS root directory:
  
  hdfs dfs -ls /
```
Found 15 items
drwxrwx--x   - hive       hive                0 2021-10-26 16:30 /apps
drwxr-xr-x   - hdfs       hadoop              0 2021-10-18 20:54 /datasets
drwxr-xr-x   - hdfs       hadoop              0 2021-10-18 20:54 /datastore
drwxrwx---+  - flink      hadoop              0 2021-10-18 21:10 /flink
drwxr-x---   - flume      hadoop              0 2021-10-18 20:54 /flume
drwxrwx--x   - hbase      hadoop              0 2021-10-30 07:31 /hbase
...
```