Monitoring system performance using tools like top, vmstat, sar, etc in centos

Monitoring system performance is essential for maintaining the health and efficiency of your CentOS system. Here are some commonly used tools for monitoring system performance:

1. top:

• top is a command-line utility that provides real-time information about system resource usage, including CPU, memory, and processes.
• Run top in the terminal to display a dynamic view of system activity. Press q to quit.

2. vmstat:

• vmstat is a command-line utility that provides information about virtual memory statistics, including CPU, memory, paging, and disk I/O.
• Run vmstat in the terminal to display a summary of system statistics. For example:

  vmstat 1 

  This command displays statistics every 1 second.

3. sar:

• sar (System Activity Reporter) is a command-line utility that collects, reports, and saves system activity information.
• Run sar with specific options to display CPU, memory, disk, and network statistics. For example:

  sar -u 1 

  This command displays CPU utilization statistics every 1 second.

4. iostat:

• iostat is a command-line utility that reports CPU and input/output statistics for devices and partitions.
• Run iostat with specific options to display disk I/O statistics. For example:

  iostat -d 1 

  This command displays disk I/O statistics every 1 second.

5. free:

• free is a command-line utility that displays information about system memory usage and swap space.
• Run free in the terminal to display memory statistics, including total, used, and free memory.

6. df:

• df is a command-line utility that displays information about disk space usage for file systems.
• Run df in the terminal to display disk space usage statistics for all mounted file systems.

7. netstat:

• netstat is a command-line utility that displays network statistics, including active network connections, routing tables, and interface statistics.
• Run netstat with specific options to display network statistics. For example:

  netstat -s 

  This command displays network statistics summary.

8. iftop:

• iftop is a command-line utility that displays real-time bandwidth usage for network interfaces.
• Run iftop in the terminal to display a dynamic view of network traffic. Press q to quit.

9. nload:

• nload is a command-line utility that displays real-time network traffic statistics in a visual format.
• Run nload in the terminal to display network traffic statistics for each interface.

10. Glances:

• Glances is a cross-platform system monitoring tool that provides an interactive and comprehensive view of system performance.
• Install Glances using the package manager (yum or dnf) and run glances in the terminal.