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This article mainly records the Linux system on some common system monitoring tools, very easy to use. It is worth taking some time to summarize what is called sharpening the knife and cutting wood.

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The brain map of this paper is as follows:

The top command

Top command I think you are familiar with it! The top command in Linux is similar to the Task manager in Windows. It can dynamically monitor and display the resource usage of each process in the system in real time. It is a commonly used performance monitoring and analysis tool in Linux.

A common execution view of the top command is as follows:

Below we mark the meaning of each indicator in detail in the diagram, carefully look at the diagram for comparison and understanding (if necessary, you can save the diagram for future reference) :

How, understand enough intuitive bar, as for the top command with some other parameters to use their own help bar, too much, no longer repeat!

Htop command

Htop is the next interactive Linux process browser, which can completely replace the top command described in the previous section. Compared with the top command, htop command has the following advantages:

  • Direct support for mouse click operation (ask you 6 not 6!)
  • The screen can scroll horizontally and vertically, more like a window
  • You can trace the process and display the files opened by the process
  • Support tree display of processes
  • Supports process search by name

Anyway, visualization is 66, let’s try it out:

For this diagram, it is divided into three parts:

  • At the top is an overview of resource usage, a progress bar that looks pretty cool
  • In the middle is the process table, similar to the top command
  • The following instructions and shortcuts are clear

Let’s look at some graphical operations:

  • Process tree

  • Mouse click on a variety of indicators to sort

  • Trace process function

Iotop command

Iotop monitors disk I/O usage. The UI is similar to TOP, including PID, user, I/O, and process information.

Most of the IO statistics tools such as iostat and nmon in Linux can only measure the read and write status of per devices. If you want to know how each process uses I/O, you can run the iotop command to view the information conveniently.

Iftop command

Iftop is a traffic and bandwidth monitoring tool for Linux systems. It can be used to view real-time network traffic, monitor TCP/IP connections, etc. It is also very useful!

Let’s do an experiment. After executing the command, the result is as follows:

The common parameters of the iftop command are as follows. Here is a summary:

  • -iSet up the monitoring network card, for example:# iftop -i eth1
  • -BDisplays traffic in bytes (bits by default), for example:# iftop -B
  • -nMake the host information directly display IP by default, for example:# iftop -n
  • -NMake the port information directly display the port number by default, for example:# iftop -N
  • -FDisplays incoming and outgoing traffic on a specific network segment, for example# iftop - F 10.10.1.0/24 或 # iftop -F 10.10.1.0/255.255.255.0
  • -h(display this message), help, display parameter information
  • -pWhen this parameter is used, the middle list displays localhost information, with IP information other than the local host.
  • -bMake the traffic graph bar display by default;

To summarize, some operation commands after entering the iftop view screen (case sensitive) :

  • According to thehSwitch whether to display help;
  • According to thenSwitch to display the IP address or host name of the host;
  • According to thesSwitch whether to display the host information of the host.
  • According to thedSwitch whether to display the host information of the remote target host.
  • According to thetSwitch the display format to 2 lines /1 line/display only the sent traffic/display only the received traffic.
  • According to theNSwitch display port number or port service name;
  • According to theSSwitch whether to display the port information of the host.
  • According to theDSwitch whether to display the port information of the remote target host.
  • According to thepSwitch whether to display port information.
  • According to thePSwitch pause/continue display;
  • According to thebSwitch whether to display the graph bar of average traffic;
  • According to theTSwitch whether to display the total traffic of each connection;
  • According to thelEnable the screen filtering function. Enter a character to be filtered, such as IP address, and press Enter. Only traffic information related to this IP address is displayed on the screen.
  • According to theLSwitch the scale above the display screen; The scale is different, the flow graph bar will change;
  • According to thejOr bykYou can scroll up or down the connection record displayed on the screen;
  • According to the1or2or3You can sort traffic data according to the three columns displayed on the right.
  • According to the<Sort by native name or IP on the left;
  • According to the>Sort by the host name or IP address of the remote destination host.
  • According to theoToggle whether only the current connection is displayed.

Remember after

Due to the limited ability, if there is a mistake or improper place, please also criticize and correct, study together!

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