Security settings for the U.S. virtual host linux System

Article Title: security settings in the U.S. virtual host linux system. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.

Most American VM instances use the Linux operating system. Therefore, when users use American VM instances, the security of the Linux system becomes the most important concern of users, after all, everyone wants to operate on a stable and secure system.

What is Linux? The official definition of Liunx: "Linux is a clone of a UNIX operating system. It is written from scratch by Linux Torvalds and a loose hacker team on the network. The objective of LINUX is to maintain compatibility with POSIX ."

As we all know, Linux is an open-source operating system. Due to its free openness and advanced technology, it conforms to the increasing requirements of software developers and users for the Right to Know information systems, as a result, it quickly won widespread support and approval, and was able to spread quickly.

The security settings of the U.S. virtual host Linux system need to be considered in three aspects:

First, the security advantages of Linux:

1. Open Idea, Open source code, self-improvement or Customization

2. Free Spirit and Free use

3. Complete network functions and built-in TCP/IP protocol

4. Real multi-task and multi-user operating systems

5. fully operating in the protection mode, making full use of the CPU Performance

6. Advanced memory management mechanism for more effective use of physical memory

7. Stability, Security, and efficiency

8. compatible with UNIX systems at the source code level and complies with the ieee posix standard

9. Supports dozens of File System formats

10. device independence and good portability

11. There is no expensive copyright fee, and the low cost is precisely because of the security features of Linux, it maintains a certain share in the market, and the market share has increased.

Second, when you use a Linux operating system to handle security issues, the following rules and techniques may be useful.

1. Avoid regular work when logging on as root. This reduces the risk of virus infection and prevents you from making some mistakes.

2. If possible, try to use encrypted connections when working on a remote machine. SSH should be used to replace telnet, ftp, rsh, and rlogin as standard operation specifications. Because SSH security is well known.

3. Keep the most important network-related packages up to date. It is best to subscribe to corresponding email lists to get the latest release announcements for bind, postfix, ssh, and other programs. The same principle applies to software related to local security.

4. Disable any network services that you do not absolutely need for normal server operation. This will make your system more secure. You can use the netstat program to find the open port with the socket status of LISTEN.

5. RPM packages from SUSE are all digitally signed. You can enter the following content on the console to verify the integrity of any suse rpm package: rpm-chechsig package. rpm. The required public gpg-key must be copied to the root directory during installation.

6. Check the backup of user and system files frequently. Remember: if you do not test whether the backup works properly, it is useless.

7. Check your log files. If possible, write a small script program to search for suspicious items.

8. Set security measures to ensure redundancy. It is better to see some security messages than to see no messages. Fixed to all-around U.S. space, no record filing, multi-subdirectory binding.

Finally, when selecting a US Vm, a good operator can save a lot of trouble for users, including the location and quality of the host serving the machine room, and the service quality of the operator, all factors that users must consider.