What steps are required to configure CentOS in HDFS

Building a Hadoop Distributed File System (HDFS) on a CentOS system requires multiple steps. This article provides a brief configuration guide.

1. Preparation

1. Install JDK: Install Java Development Kit (JDK) on all nodes, the version must be compatible with Hadoop. The installation package can be downloaded from the Oracle official website.

2. Environment variable configuration: Edit /etc/profile file, set Java and Hadoop environment variables, so that the system can find the installation path of JDK and Hadoop.

2. Security configuration: SSH password-free login

1. Generate SSH keys: Use the ssh-keygen command to generate an SSH key pair on each node.

2. Key distribution: Copy the public key ( ~/.ssh/id_rsa.pub ) to the ~/.ssh/authorized_keys file of all other nodes to realize password-free login between nodes.

3. Core configuration file modification

Modify the core configuration files of Hadoop, which are usually located in etc/hadoop folder under the Hadoop installation directory:

1. core-site.xml : Configure the default file system address of HDFS.

2. hdfs-site.xml : Configure key parameters of HDFS, such as data block size, number of copies, etc.

3. mapred-site.xml and yarn-site.xml : Configure the relevant parameters of MapReduce and YARN frameworks.

4. NameNode formatting

Run the following command on the NameNode node to format NameNode:

 hdfs namenode -format

5. Start HDFS

Run the following command on any node to start HDFS:

 sbin/start-dfs.sh

6. HDFS operation status verification

Use the jps command to check whether HDFS is started successfully. You should see processes such as NameNode and DataNode are running.

7. Advanced configuration (optional)

1. Time synchronization: It is recommended to configure NTP service to ensure time synchronization of all nodes in the cluster and avoid problems caused by time differences.

2. Web UI configuration: Configure YARN's ResourceManager and NodeManager to monitor the running status of HDFS through the web interface.

Note: The above steps are only a brief guide, and the specific configuration details may vary depending on the Hadoop version and system environment. Be sure to refer to the official Hadoop documentation for more detailed and accurate configuration information to ensure the correct installation and operation of HDFS.

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