Teach you how to use SSH in Linux SysOps for system monitoring and performance tuning

Teach you how to use SSH in Linux SysOps for system monitoring and performance tuning

With the rapid development of cloud computing technology, the Linux operating system serves as a cloud service Fundamentals are also getting more and more attention. As a Linux SysOps, system monitoring and performance tuning are one of the skills we must master. In this article, I will teach you how to use SSH tools for system monitoring and performance tuning to improve your work efficiency.

What is SSH?

SSH (Secure Shell) is a network protocol used for secure remote login over insecure networks through encryption. Through SSH, we can remotely log in to the remote host through the command line terminal on the local host and execute commands. This provides convenience for us to perform system monitoring and performance tuning.

Steps to use SSH

First, open a terminal on the local host and enter the following command to connect to the remote host:

ssh username@remote_host

Among them, username is your username on the remote host, and remote_host is the IP address or domain name of the remote host you want to connect to. After pressing Enter, you will be asked to enter your password for authentication. If entered correctly, you will successfully connect to the remote host.

System monitoring

System monitoring is an important part of our understanding and management of our system status. Using SSH, we can implement system monitoring by executing some commands.

1. View system load:

uptime

This command will display the average load of the system. Load average refers to the number of processes the system is processing. Generally, if the average load is greater than 75% of the number of CPU cores, it can be considered that the system load is high and needs to be optimized.

2. View memory usage:

free -h

Use this command to view the memory usage of the system. Among them, -h means to display the results in an easy-to-read format. We can judge whether the system memory is sufficient based on the ratio of available memory to used memory.

3. Check the disk usage:

df -h

This command is used to check the disk usage of the system. The -h parameter indicates that the results are displayed in an easy-to-read format. Through this command, we can understand the disk usage, clean up useless files in time, and free up disk space.

Performance Tuning

Performance tuning is to improve the response speed and efficiency of the system. Using SSH, we can perform performance tuning by executing some commands.

1. View the currently active processes:

top

This command will display the active processes and resource usage of the current system in real time Condition. By observing the output of top, we can find processes that occupy higher CPU and memory and perform targeted tuning.

2. Check the network connection:

netstat -tunap

With this command, we can check the network connection of the current system Situation, including local address, remote address, connection status, etc. By analyzing the network connection, we can identify potential problems such as network latency or abnormal connections.

3. View the log file:

tail -f /var/log/syslog

Using this command, we can Check the system log file (syslog is used as an example here). By checking the log files, we can understand the operation of the system and find and solve problems in time.

Summary

Through SSH tools, we can easily monitor and perform Linux system monitoring and performance tuning. This article introduces some commonly used commands and techniques. I hope this content will be helpful to your work. Of course, SSH has more and more powerful functions, and you can improve your skills through further study and practice. come on!

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