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:
- Make sure the Hadoop cluster is up and running.
- Access the Web UI: Enter
http://<namenode-host> :50070</namenode-host>
in your browserhttp://<namenode-host> :50070</namenode-host>
(Hadoop 2.x) orhttp://<namenode-host> :9870</namenode-host>
(Hadoop 3.x). The default username and password are usuallyhdfs/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:
- Install Prometheus: Download and unzip Prometheus, run
./prometheus --config.file=prometheus.yml
to start the service. - 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>
- Install Grafana: Download and unzip Grafana, run
./bin/grafana-server
to start the service. - Grafana configuration: access
http://<grafana-host> :3000</grafana-host>
, log in with the default username and passwordadmin/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:
- Start jconsole: Run the
jconsole
command. - 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.
The above is the detailed content of How to monitor HDFS status on CentOS. For more information, please follow other related articles on the PHP Chinese website!

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