Shulou(Shulou.com)06/02 Report--

Linux theory + system installation what is a Linux system: Linux is a set of Unix-like operating system that is free to use and spread freely. It is a multi-user, multi-task, multi-thread and multi-CPU operating system based on POSIX and Unix. With the development of the Internet, Linux has received support from software enthusiasts, organizations and companies all over the world. In addition to maintaining a strong development momentum in the server operating system, it has made great progress in personal computers and embedded systems. Users can not only intuitively obtain the implementation mechanism of the operating system, but also modify and improve the operating system according to their own needs to maximize meet the needs of users. Linux is not only a stable system, but also an open source software. The core firewall components have high performance and simple configuration, which ensures the security of the system. In many enterprise networks, in order to pursue speed and security, Linux operating system is not only used as a server by network operators, Linux can be used not only as a server, but also as a network firewall is a bright spot of Linux. Compared with other operating systems, Linux has the characteristics of open source, no copyright and many users in the technical community. Open source enables users to cut freely, with high flexibility, powerful functions and low cost. In particular, the network protocol stack is embedded in the system, which can realize the function of the router after proper configuration. These characteristics make Linux an ideal development platform for developing routing switching devices. First acquaintance with Linux system

The Linux system is composed of:

Linux kernel

Various peripheral programs: desktop network. Peripheral programs are written in C++.

Kernel: very small 200MB or so, mainly translating external instructions into commands that the hardware can operate. The kernel is the translator at the system level.

The kernel is written by C language for process-oriented language.

Attached: Python object-oriented and process-oriented language

Next, let's start installing the image file of CentOS 7:

CentOS software can be downloaded from the official website: https://www.centos.org/

In the following experiment, we will install the system through the virtual machine so that it can surf the Internet.

Let's install it with the virtual machine VMare.

Open Vmare first

Students with high memory configuration can choose 4GB here.

Here the disk space is set to 40GB, or higher, because the installation file is large and for later use.

At this point with the key control, select the first, enter

Click to start the installation

At this point, let's log out and enter the root account so that you can use the administrator privileges.

After opening the browser, we found that we could not surf the Internet, and we began to configure it. So that it can access the Internet.

Enter the command vim / etc/sysconfig/network-scripts/ifcfg-ens33

After entering the interface, you will still use the arrow keys to control, find onboot at last, click the I key of the keyboard at this time, enter the editing mode, and change no to yes

When the input is complete, press the ESC key to exit edit mode and enter command mode

Enter: then enter wq! Then press enter to go out.

Open the network at this time to see if it is connected.

The experiment was a success!

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