The most commonly used Linux commands to help you maintain server security

The most commonly used Linux commands to help you maintain server security

Overview:
Linux, as an open source operating system, is widely used around the world in a server environment. As server administrators, it is very important that we keep our servers secure at all times. In this article, we will introduce some of the most commonly used Linux commands, which can help us maintain the security of the server and ensure the normal operation of the server.

1. Update system commands:

The first step in a secure server is to keep the system updated in a timely manner. Below are some common commands for updating your system.

1.1 Update the software package library:

sudo apt-get update

1.2 Upgrade the system:

sudo apt-get upgrade

2. Search command:

Sometimes we need to search The location of a file or folder. Here are some common search commands.

2.1 Find a file based on the file name:

find / -name example.txt

2.2 Find a file based on the file content:

grep -rnw '/path/to/search/' -e 'pattern'

3. View process command:

In order to ensure that the server is running properly, we need to check the running processes from time to time. Below are some common commands for viewing processes.

3.1 View all processes:

ps -ef

3.2 Find processes based on process names:

ps -ef | grep example_process

4. Network commands:

In server management , we often need to check the network connection status. Here are some commonly used network commands.

4.1 Check the current network connection:

netstat -tunlp

4.2 Check whether a specific port is open:

netstat -tunlp | grep 80

5. Scheduled task command:

Scheduled Tasks can help us automatically run some scripts or commands. Here are some commonly used scheduled task commands.

5.1 Add a scheduled task:

crontab -e

5.2 View the scheduled task list:

crontab -l

6. Firewall command:

The firewall can help us To protect your server from unauthorized access, here are some commonly used firewall commands.

6.1 Check the firewall status:

sudo ufw status

6.2 Allow specific port access:

sudo ufw allow 80

7. User management command:

Manage server users is very important, the following are some commonly used user management commands.

7.1 Create a new user:

sudo adduser new_user

7.2 Delete a user:

sudo deluser old_user

Summary:
This article introduces some of the most commonly used Linux commands, which can help us maintain Server security. Whether updating the system, finding files, viewing processes, managing network connections, setting up scheduled tasks, or managing users, these commands are essential tools for server administrators. By mastering these commands, we can better protect the server from attacks and ensure the stable operation of the server.

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