CentOS 7.9 installation and centos 7.9 installation ssh
php editor Youzi will introduce you to the installation of CentOS 7.9 and how to install ssh. CentOS 7.9 is a stable and reliable Linux operating system suitable for various servers and workstations. Installing CentOS 7.9 can help you build a powerful server environment and provide stable support for your websites and applications. In addition, by installing ssh, you can remotely manage your server for more convenient operation and management. The following will introduce you to the installation steps of CentOS 7.9 and how to install ssh in detail.
CentOS 7.9 is a free and open source Linux operating system. It is a binary-compatible version based on Red Hat Enterprise Linux (RHEL). The following are the steps to install CentOS 7.9:
1. You need to download the ISO image file of CentOS 7.9. You can download the latest CentOS 7.9 ISO image file from the CentOS official website.
2. Create a new virtual machine or physical machine on your computer, and mount the CentOS 7.9 ISO image file to the virtual machine or physical machine.
3. Start the virtual machine or physical machine and follow the instructions of the boot program to install. During the installation process, you need to select the appropriate language, time zone, keyboard layout and other options.
4. In the installation type, select "Minimal Install", which will install a minimal CentOS 7.9 system, containing only the most basic software packages.
5. Set up your hostname and network configuration, including IP address, gateway, DNS server, etc.
6. During the installation process, you will need to create an administrator user and set a password. Make sure to choose a strong password to ensure the security of the system.
7. After completing the installation, restart the system and you will see the CentOS 7.9 login interface.
SSH (Secure Shell) is a secure remote login protocol that protects your data and identity by encrypting communications. Here are the steps to install SSH on CentOS 7.9:
1. Log in to the CentOS 7.9 system as an administrator user.
2. Open a terminal and use the following command to install SSH:
```
sudo yum install openssh-server
3. After the installation is complete , use the following command to start the SSH service:
sudo systemctl start sshd
4. To automatically start the SSH service when the system starts, use the following command:
sudo systemctl enable sshd
5. Make sure the firewall allows the SSH service to pass through and use the following command to open the SSH port (default is 22):
sudo firewall-cmd --add-port=22/tcp --permanent
sudo firewall-cmd --reload
6. Now you can use SSH client to connect to your CentOS 7.9 system. On another computer, use the following command to connect to your CentOS 7.9 systems:
ssh username@ip_address
Replace "username" with your administrator username and "ip_address" with the IP address of your CentOS 7.9 system.
In Linux, there is a very useful command called "grep", which is used to search for a specified string or pattern in a text file and return the matching lines, if you want to To find lines containing a specific keyword, you can use the following command:
grep "keyword" filename
This will search the "filename" file for lines containing "keyword" and print them come out. "keyword" can be a word, phrase, or regular expression.
The above is the detailed content of CentOS 7.9 installation and centos 7.9 installation ssh. For more information, please follow other related articles on the PHP Chinese website!

The main tasks of Linux system administrators include system monitoring and performance tuning, user management, software package management, security management and backup, troubleshooting and resolution, performance optimization and best practices. 1. Use top, htop and other tools to monitor system performance and tune it. 2. Manage user accounts and permissions through useradd commands and other commands. 3. Use apt and yum to manage software packages to ensure system updates and security. 4. Configure a firewall, monitor logs, and perform data backup to ensure system security. 5. Troubleshoot and resolve through log analysis and tool use. 6. Optimize kernel parameters and application configuration, and follow best practices to improve system performance and stability.

Learning Linux is not difficult. 1.Linux is an open source operating system based on Unix and is widely used in servers, embedded systems and personal computers. 2. Understanding file system and permission management is the key. The file system is hierarchical, and permissions include reading, writing and execution. 3. Package management systems such as apt and dnf make software management convenient. 4. Process management is implemented through ps and top commands. 5. Start learning from basic commands such as mkdir, cd, touch and nano, and then try advanced usage such as shell scripts and text processing. 6. Common errors such as permission problems can be solved through sudo and chmod. 7. Performance optimization suggestions include using htop to monitor resources, cleaning unnecessary files, and using sy

The average annual salary of Linux administrators is $75,000 to $95,000 in the United States and €40,000 to €60,000 in Europe. To increase salary, you can: 1. Continuously learn new technologies, such as cloud computing and container technology; 2. Accumulate project experience and establish Portfolio; 3. Establish a professional network and expand your network.

The main uses of Linux include: 1. Server operating system, 2. Embedded system, 3. Desktop operating system, 4. Development and testing environment. Linux excels in these areas, providing stability, security and efficient development tools.

The Internet does not rely on a single operating system, but Linux plays an important role in it. Linux is widely used in servers and network devices and is popular for its stability, security and scalability.

The core of the Linux operating system is its command line interface, which can perform various operations through the command line. 1. File and directory operations use ls, cd, mkdir, rm and other commands to manage files and directories. 2. User and permission management ensures system security and resource allocation through useradd, passwd, chmod and other commands. 3. Process management uses ps, kill and other commands to monitor and control system processes. 4. Network operations include ping, ifconfig, ssh and other commands to configure and manage network connections. 5. System monitoring and maintenance use commands such as top, df, du to understand the system's operating status and resource usage.

Introduction Linux is a powerful operating system favored by developers, system administrators, and power users due to its flexibility and efficiency. However, frequently using long and complex commands can be tedious and er

Linux is suitable for servers, development environments, and embedded systems. 1. As a server operating system, Linux is stable and efficient, and is often used to deploy high-concurrency applications. 2. As a development environment, Linux provides efficient command line tools and package management systems to improve development efficiency. 3. In embedded systems, Linux is lightweight and customizable, suitable for environments with limited resources.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Atom editor mac version download
The most popular open source editor

SublimeText3 Linux new version
SublimeText3 Linux latest version

SublimeText3 Mac version
God-level code editing software (SublimeText3)

SublimeText3 English version
Recommended: Win version, supports code prompts!

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.