How to monitor HDFS status on CentOS

There are many ways to monitor the status of HDFS (Hadoop Distributed File System) on CentOS systems. This article will introduce several commonly used methods to help you choose the most suitable solution.

1. Use Hadoop’s own web UI

Hadoop's own web interface provides cluster status monitoring function.

step:

1. Make sure the Hadoop cluster is up and running.
2. Access the Web UI: Enter http://<namenode-host> :50070</namenode-host> in your browser http://<namenode-host> :50070</namenode-host> (Hadoop 2.x) or http://<namenode-host> :9870</namenode-host> (Hadoop 3.x). The default username and password are usually hdfs/hdfs .

2. Command line tool monitoring

Hadoop provides a series of command line tools to facilitate monitoring of cluster status.

Commonly used commands:

• Check NameNode status: Use hdfs dfsadmin -report command to obtain the overall status of the cluster, including the number of DataNodes, capacity usage and other information.
• NameNode health status check: hdfs dfsadmin -report -health command can display the health status of NameNode.
• DataNode status and corrupt block detection: hdfs dfsadmin -report -listCorruptFileBlocks command lists corrupt file blocks.

3. Third-party monitoring tools

Many third-party monitoring tools, such as Prometheus, Grafana, Nagios, etc., can also effectively monitor HDFS clusters.

Prometheus and Grafana examples:

1. Install Prometheus: Download and unzip Prometheus, run ./prometheus --config.file=prometheus.yml to start the service.
2. Configure Prometheus monitoring HDFS: Edit prometheus.yml and add HDFS monitoring configuration, for example:

 scrape_configs:
  - job_name: 'hdfs'
    static_configs:
      - targets: ['<namenode-host> :50070']</namenode-host>

3. Install Grafana: Download and unzip Grafana, run ./bin/grafana-server to start the service.
4. Grafana configuration: access http://<grafana-host> :3000</grafana-host> , log in with the default username and password admin/admin , add the Prometheus data source, and create a dashboard to monitor the HDFS status.

4. Utilize Hadoop JMX interface

Hadoop components (NameNode, DataNode, etc.) provide JMX interfaces, which can be monitored through JMX client tools (jconsole, VisualVM, etc.).

jconsole example:

1. Start jconsole: Run the jconsole command.
2. Connect to Hadoop process: Select the Hadoop process (NameNode or DataNode) to monitor in jconsole to view the relevant MBean information.

Select the solution that suits your needs among the above methods to effectively monitor the HDFS cluster status on the CentOS system.

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