Introduction to YI-MapReduce Cluster Nodes
Remote Login
Nodes within a YI-MapReduce cluster support two methods for remote login, interface login and SSH login:
• Interface Login: Go to the YI-MapReduce console -> enter the Node Management page. Use the remote login feature on the page and log in to the Linux interface of each node in the cluster.
• SSH Login: Only applicable to Linux elastic cloud server (ECS). You can use tools such as PuTTY and XSHELL for remote login to the ECS. Prior to this method, the ECS needs to bind an Elastic IP address. For detailed steps, please refer to Bind/Unbind Elastic IP.
² Description
For detailed steps of accessing cluster nodes using the password method, please refer to Log in to Cluster Nodes (SSH password method).
Node Types and Functions
A node in the YI-MapReduce cluster refers to an ECS. The different types of nodes and their functions are as shown below.
Node Type | Feature |
Master Node | The master node of the YI-MapReduce cluster supervises and monitors the cluster. Select My Cluster in the YI-MapReduce console, choose a running cluster and click on its name to enter the cluster information page. Click Node Management to view information of the nodes. Nodes can log in either using the VNC method by clicking Remote Login, or through SSH login. |
Core Node | A worker node of the YI-MapReduce cluster that processes and analyzes data, as well as stores process data. |
Log in to Cluster Nodes
This section provides guidance on how to utilize the remote node connection (VNC method) offered by the YI-MapReduce console and the password method (SSH method) to log in to nodes within a YI-MapReduce cluster. The main use case for remote connection is in emergency O&M scenarios where related maintenance operations are required on ECS. For other cases, it is highly recommended to use the SSH method for logging into cluster nodes.
² Description
If the SSH method is required for logging into cluster nodes, you need to manually add an inbound rule in the security group rules of the cluster where the source address is "client public IPV4 address/32" and the port is 22. For detailed steps, please refer to Help Center > Virtual Private Cloud > Security Group > [Adding a Security Group Rule].
Log in to Elastic Cloud Server (VNC Method)
1. Log in to the YI-MapReduce service console.
2. Select Cluster List > My Cluster, choose a running cluster and click on its name to enter the cluster information page.
3. Select Node Management. Click to expand node group and it will display the node list.
4. In the Operation column on the right side of the target node, click Remote Connection.
5. In the new tab of the VNC mode web page, you can see the command line interface of the server, similar to the login mode of a Linux server. Enter the root account and password.
² Description
If you chose the "Password" login method when creating the cluster, the password required is the one you set when creating the cluster.
Log in to Elastic Cloud Server (SSH Key Method)
For Local Windows Operating System Users
If your local system operates on Windows and you need to log in to a Linux ECS, you can follow the steps below. This example uses Xshell.
1. Log in to the YI-MapReduce service console.
2. Select Cluster List > My Cluster, choose a running cluster and click on its name to enter the cluster information page.
3. Select Node Management. Click to expand node group and it will display the node list.
4. In the Operation column to the right of the target node, click More and select Bind EIP. You can choose an available and unbound elastic public IP for this node, or click + Create an EIP. This will redirect you to the EIP console where you can purchase an EIP, and then complete the EIP binding. If you have already bound an EIP, you may skip this step.
5. Run Xshell.
6. Select New Session.
7. Name: Choose a session name that is suitable and easy for management.
8. Protocol: Use the default "SSH".
9. Host: Enter the EIP to which the ECS is bound.
10. Port No: Use the default "22", as shown below. Click on Session.
11. Click Connect. Follow the instructions to input and save the login username ("root" by default) and password to complete the remote login.
For Local Linux Operating System Users
If your local system operates on Linux and you need to log in to a Linux ECS, you can follow the steps below.
Run the following command to log in to the ECS.
ssh default username@EIP
Assuming the default username for the Linux ECS is "root", and the EIP is 123.123.123.123, the command should be:
ssh root@123.123.123.123