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.

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