Access a cluster node with SSH

Available in Classic

You can submit management tasks or applications through NAVER Cloud Platform's Cloud Hadoop console or web UI (Ambari, Hue, etc.). However, SSH connection to the cluster node is required to run the client directly.

Preliminary tasks

To access a cluster node, the following tasks and preparations need to be made.

Add the public IP to ACG

To add a fixed IP to the cluster's ACG:

1. From the NAVER Cloud Platform console's Classic environment, navigate to Menu > Services > Compute > Server > ACG.
2. Select the ACG of the cluster you want to access and click [Set ACG].
3. Enter the following 4 information items and add ACG Rule:
   • Protocol: TCP
   • Access source: IP of the local device that communicates with SSH
   • Allowed port: 22
   • Note (optional)
     

SSH connection in the mac OS

This section describes the access method using iTerm2. Even if other programs are used, the same action generates the same outcome.

chmod 400 </path/to/pem-key>
ssh -i </path/to/pem-key>  sshuser@<cluster-domain>

SSH connection in Windows

This section describes the access method using the PuTTY client. Even if other programs are used, the same action generates the same outcome.

Follow the steps below in order:

• 1. Convert authentication key (pem)
• 2. Connect to cluster node

1. Convert authentication key (.pem)

PuTTY doesn't natively support the private key format (.pem) generated by Cloud Hadoop. You can use the PuTTYgen application provided by PuTTY to convert the authentication key into the format (.ppk) used by PuTTY. The private key must be converted to this format (.ppk) before PuTTY can be used to connect to the master node.

1. Run PuTTYgen. (Download PuTTYgen)
2. Select RSA in Type of key to generate and click [Load].
3. Select the authentication key (*.pem) and then click [Open].
   • To find a file in PEM format, select the option that allows you to see files of all types.
   • The PEM file is the file name of the authentication key that is currently applied to the cluster. This PEM file must be stored on the user's local PC.
   • If the PEM file is missing, the authentication key for connection can be changed from the Console > Manage server access > Manage authentication key for direct cluster connection menu. (See Manage authentication key for direct cluster connection)
4. Check the details on the Completion confirmation popup and then click [OK].
5. Click [Save private key] and save it as a file of .ppk format available in PuTTY.
   • If PuTTYgen displays a warning message about saving a key without a password, click [Yes].
   • Save it using the same name as the previously generated authentication key. PuTTY automatically adds the .ppk file extension.

2. Connect to cluster node

1. Run PuTTY. (Download PuTTY)
2. Select Session in the Category window and enter info in each of the settings fields as below.
   • Host Name (or IP address): sshuser@DNS (Enter the public domain or public IP of the relevant cluster into DNS of sshuser@DNS)
   • Port: 22
3. In the Category window, select Connection > SSH to expand, and then click the Auth item.
4. Click [Browse] to select the PPK file created by converting the PEM file, and then click [Open].
5. Check if connection to the edge node has been established successfully as follows: