How to monitor Zookeeper memory usage on CentOS

There are many ways to monitor the use of ZooKeeper memory on CentOS system. This article will introduce several commonly used command line tools and third-party monitoring solutions.

Monitor ZooKeeper memory using system commands

The following command-line tools can view the memory usage of the ZooKeeper process in real time or periodically:

1. top command: displays the system process resource usage in real time.

    top -p $(cat /var/run/zookeeper.pid)

   This command displays the real-time memory usage of the ZooKeeper process (PID read from /var/run/zookeeper.pid file).

2. ps command: Display process details, including memory usage.

    ps -p $(cat /var/run/zookeeper.pid) -o %mem,%cpu,cmd

   This command displays the memory usage percentage, CPU usage percentage of the ZooKeeper process, and the command line.

3. htop command: interactive process viewer, providing more intuitive resource usage information. (Requires installation: yum install htop )

    htop -p $(cat /var/run/zookeeper.pid)

   htop provides a richer interactive interface to monitor the memory usage of the ZooKeeper process.

4. vmstat command: displays system virtual memory statistics. Although the memory usage of ZooKeeper cannot be directly displayed, it can provide the overall memory usage of the system to help determine whether ZooKeeper takes up too much memory.

    vmstat 1

   This command updates the system virtual memory statistics once a second.

5. sar command: collects and reports system activity information, including memory usage. (May need to install: yum install sysstat )

    sar -u 1 5

   This command collects CPU usage once a second and displays 5 results. Although the CPU is mainly concerned, other indicators can be combined to assist in judging memory pressure.

Use ZooKeeper's own tools

ZooKeeper itself also provides some monitoring tools:

6. zkServer.sh status command: Displays the status information of the ZooKeeper server, including memory usage.

    /path/to/zookeeper/bin/zkServer.sh status

   Replace /path/to/zookeeper with ZooKeeper installation path.

Use third-party monitoring tools (Prometheus and Grafana)

For more advanced monitoring and visualization, Prometheus and Grafana are available:

7. Prometheus and Grafana: Provides more detailed monitoring data and visual interfaces. (Prometheus and Grafana need to be installed separately and configured with the corresponding configuration files.)

   The installation steps and configuration process are omitted because this part is relatively lengthy and has nothing to do with the core monitoring method. There are many tutorials on Prometheus and Grafana monitoring ZooKeeper on the Internet.

Which method to choose depends on your monitoring needs and technical level. For simple monitoring, top or htop command is sufficient; for more comprehensive monitoring and visualization, Prometheus and Grafana are recommended. The zkServer.sh status command is provided by ZooKeeper itself and is worth a try.

The above is the detailed content of How to monitor Zookeeper memory usage on CentOS. For more information, please follow other related articles on the PHP Chinese website!