Help Center/ MapReduce Service/ User Guide/ MRS Cluster O&M/ Logging In to an MRS Cluster/ Logging In to an MRS Cluster Node
Updated on 2024-09-23 GMT+08:00
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Logging In to an MRS Cluster Node

This section describes how to remotely log in to an ECS in an MRS cluster using the remote login (VNC mode) function provided on the ECS management console or a key or password (SSH mode). Remote login (VNC mode) is mainly used for emergency O&M. In other scenarios, it is recommended that you log in to the ECS using SSH.

To log in to a cluster node using SSH, you need to add an inbound rule to the security group of the cluster. Set Source to IPv4 address of the client/32 or IPv6 address of the client/128 and set the port number to 22. For details, see Adding a Security Group Rule.

Logging In to an ECS Using VNC

  1. Log in to the MRS management console.
  2. Choose Active Clusters in the navigation pane, select a running cluster, and click its name to switch to the cluster details page.
  3. On the Nodes tab page, click the name of a Master node in the Master node group to log in to the ECS management console.
  4. In the upper right corner, click Remote Login.
  5. Enter the username and password for logging in to the Master node as prompted.

    1. If you select Password for Login Mode, you need to enter root in Username and the password you set during cluster creation in Password.
      Figure 1 Selecting password as the login mode
    2. If you select Key Pair for Login Mode when creating a cluster, perform the following operations to log in to the cluster:
      1. After the cluster is created, assign an EIP and bind it to the Master node of the cluster. For details, see Assigning an EIP and Binding It to an ECS.
      2. Remotely log in to the Master node in SSH mode as user root using the key file.
      3. Run the passwd root command to set a password for user root.
      4. Go back to the login interface, and enter root and the password set in 5.b.iii to log in to the node.

Logging In to an ECS Using a Key Pair (SSH)

Logging In to the ECS from Local Windows

To log in to the Linux ECS from local Windows, perform the operations described in this section. The following procedure uses PuTTY as an example to log in to the ECS.

  1. Log in to the MRS management console.
  2. Choose Active Clusters in the navigation pane, select a running cluster, and click its name to switch to the cluster details page.
  3. On the Nodes tab page, click the name of a Master node in the Master node group to log in to the ECS management console.
  4. Click the EIPs tab, click Bind EIP to bind an EIP to the ECS, and record the EIP. If an EIP has been bound to the ECS, skip this step.
  5. Check whether the private key file has been converted to .ppk format.

    • If yes, go to 10.
    • If no, go to 6.

  6. Run PuTTY.
  7. In the Actions area, click Load and import the private key file you used during ECS creation.

    Ensure that the private key file is in the format of All files (*.*).

  8. Click Save private key.
  9. Save the converted private key, for example, kp-123.ppk, to a local directory.
  10. Run PuTTY.
  11. Choose Connection > Data. Enter the image username in Auto-login username.

    The image username for cluster nodes is root.

  12. Choose Connection > SSH > Auth. In the last configuration item Private key file for authentication, click Browse and select the private key in .ppk format or the private key saved in 9.
  13. Click Session.

    1. Host Name (or IP address): Enter the EIP bound to the ECS.
    2. Port: Enter 22.
    3. Connection Type: Select SSH.
    4. Saved Sessions: Task name, which can be clicked for remote connection when you use PuTTY next time
      Figure 2 Clicking Session

  14. Click Open to log in to the ECS.

    If you log in to the ECS for the first time, PuTTY displays a security warning dialog box, asking you whether to accept the ECS security certificate. Click Yes to save the certificate to your local registry.

Logging In to the ECS from Local Linux

To log in to the Linux ECS from local Linux, perform the operations described in this section. The following procedure uses private key file kp-123.pem as an example to log in to the ECS. The name of your private key file may differ.

  1. On the Linux CLI, run the following command to change operation permissions:

    chmod 400 /path/kp-123.pem

    In the preceding command, replace path with the actual path where the key file is saved.

  2. Run the following command to log in to the ECS:

    ssh -i /path/kp-123.pemDefault username@EIP

    For example, if the default username is root and the EIP is 123.123.123.123, run the following command:

    ssh -i /path/kp-123.pem root@123.123.123.123
    • path indicates the path where the key file is saved.
    • EIP indicates the EIP bound to the ECS.
    • The image username is root for cluster nodes.

Logging In to an ECS Using a Password (SSH)

Logging In to the ECS from Local Windows

To log in to the Linux ECS from local Windows, perform the operations described in this section. The following procedure uses PuTTY as an example to log in to the ECS.

  1. Log in to the MRS management console.
  2. Choose Active Clusters in the navigation pane, select a running cluster, and click its name to switch to the cluster details page.
  3. On the Nodes tab page, click the name of a Master node in the Master node group to log in to the ECS management console.
  4. Click the EIPs tab, click Bind EIP to bind an EIP to the ECS, and record the EIP. If an EIP has been bound to the ECS, skip this step.
  5. Run PuTTY.
  6. Click Session.

    1. Host Name (or IP address): Enter the EIP bound to the ECS.
    2. Port: Enter 22.
    3. Connection Type: Select SSH.
    4. Saved Sessions: Task name, which can be clicked for remote connection when you use PuTTY next time
      Figure 3 Clicking Session

  7. Click Window and select UTF-8 for Remote character set: in Translation.
  8. Click Open to log in to the ECS.

    If you log in to the ECS for the first time, PuTTY displays a security warning dialog box, asking you whether to accept the ECS security certificate. Click Yes to save the certificate to your local registry.

  9. After the SSH connection to the ECS is set up, enter the username and password as prompted to log in to the ECS.

    The username is root and the password is the one you set during cluster creation.

Logging In to the ECS from Local Linux

If the local host runs Linux, perform steps 1 to 4 to bind an EIP to the ECS, and run the following command on the CLI to log in to the ECS: ssh EIP bound by the ECS