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Linux Commands to Keep Your Server Secure: Essential Skills and Best Practices
As a server administrator, keeping your server secure is one of our top priorities. . In Linux systems, using some necessary security commands and best practices can strengthen the server's defense capabilities.
Below, we will introduce some commonly used Linux commands and provide code examples to help administrators master and apply these commands to ensure the security of the server.
The system log is a record of server operation and an important source for discovering potential problems and security threats. Administrators can use the following command to view the system log:
tail -f /var/log/syslog
The above command will dynamically display the contents of the syslog file, and the administrator can monitor the running status of the server at any time.
Properly managing users and permissions is the key to maintaining server security. Administrators can use the following commands to manage users and permissions:
sudo adduser newuser
sudo deluser username
sudo passwd username
sudo usermod -aG groupName username
Firewall Is an important tool for protecting your server from unauthorized access. Administrators can use the following commands to configure and manage the firewall:
sudo ufw status
sudo ufw enable
sudo ufw disable
sudo ufw allow port_number
Keeping the packages on the server up to date is an important aspect of staying secure. Administrators can update and upgrade packages using the following commands:
sudo apt update
sudo apt upgrade
sudo apt autoremove
Key login is more secure than password login, administrator You can use the following commands to configure and use key login:
ssh-keygen -t rsa
ssh-copy-id username@server_ip
Data backup is an important aspect of server security. Administrators can use the following command to back up data regularly:
sudo tar -czvf backup.tar.gz /path/to/backup_folder
sudo tar -xzvf backup.tar.gz -C /path/to/restore_folder
Protect sensitive files and Directory data security, administrators can use the following commands to encrypt files and directories:
gpg -c filename
gpg filename.gpg
tar -czvf - directory_name | gpg -c > backup.tar.gz.gpg
gpg -d backup.tar.gz.gpg | tar -xzvf -
The above are several commonly used Linux commands that can help administrators Keep your server secure. Of course, there are more commands and best practices to explore and apply in actual use.
As a server administrator, constantly learning and mastering these commands and practices will help us better protect the server and ensure its safe operation.
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