CentOS For Linux 7.9.2009 Chinese version

Centos 6.5 software features

1． CentOS can be understood as the Red Hat AS series! It is completely improved upon Red Hat AS and released! Various operations and uses are no different from RED HAT!
2. CentOS is completely free, and there is no problem that RED HAT AS4 requires a serial number.
3. CentOS's unique yum command supports online upgrades, which can update the system instantly. Unlike RED HAT, which requires money to purchase support services!
4. CentOS has fixed many RHEL BUGs!
5. CentOS version notes: CentOS3.1 is equivalent to RED HAT AS3 Update1 CentOS3.4 is equivalent to RED HAT AS3 Update4 CentOS4.0 is equivalent to RED HAT AS4

Centos 6.5 installation tutorial

​​ 1. In the system interface, select an option and press Enter:

​ ​ 2. What this means is, press OK to test your installation media, that is, the DVD disc, and skip directly SKIP

​ ​ 3. This is the first graphical interface. We click “Next” in the lower right corner to proceed to the next step.

4. Then when it comes to choosing the language to install, select the corresponding voice according to your needs, as shown in the figure

5. Select the keyboard and leave it as default. As shown in the picture

​​ 6. Select the storage device to be installed here. After selecting: Basic storage device, click Next.

​​ 7. A warning will pop up at this time, and all data on the detected hard drive (40960MB) will be deleted. If it is a multi-hard drive installation or upgrade installation, be careful. If you want to install a new one, click directly: Yes, as shown in the figure

​ 8. Enter the device server machine name, and then click Next:

​​ 9. Here is the time zone selection. Here we choose: Asia/China/Shanghai, as shown in the picture. Next step.

10. Set the password for the root account (root), as shown in the picture. If your password is too simple, there will be another prompt, and we can choose: use it anyway. As shown in the picture.

​​ 11. When you get to this interface, it is about partitioning and installation. If it is a new installation, select: use all space, as shown in the figure

12. Click Next and you will be prompted to confirm formatting and writing data. We choose: Write changes to disk. As shown in the picture

13. Format

14. Then it’s time to choose to install Centos system components, and the specific system functions will be explained.
This step is to choose what the machine is used for, as shown in the picture, they are:
                  1) Installation of desktop system
​​​​​​​​​2) Minimize desktop system installation
                    3) Minimized installation
                    4) Basic server installation
                        5) Installation of database server
                                                  6) Installation of WEB web server
                      7) Installation of virtual host
                      8) Installation of software development workstation

15. Click Next. If you have checked Customize now to customize the installed components, you can modify each component and function. As shown in the picture.

16. The system starts to install and you need to wait for a few minutes:

17. After the installation is complete, click: Reboot, that is, after restarting, enter the Centos system.

18. Restart the system, enter the username and password, log in to the system, and the system is installed successfully:

Centos 6.5 configure network address and configure firewall

​ ​ 1. Configure IP address
vi /etc/sysconfig/network-scripts/ifcfg-eth0

2. Restart the network card:

3. Test network:

4. Turn off the firewall:

5. Turn off the firewall and start it automatically at boot:

​​ 6. Turn off the firewall selinux:
vi /etc/sysconfig/selinux

​​ 7. Restart the operating system and make selinux take effect:
shutdown -r now

8. Log in and test the network:

centos6.5 common commands

​ ​ ls -l displays the creation time of all files in the current directory (ls space-l)
      cd .. 进入上一个目录（cd空格..）
cd l to enter the next l directory
​ ​ rm * Delete all files in the current directory
pwd displays the current directory path
mv+file to be moved (absolute path)+target directory (. represents the current directory)
Su normal user switches to root
                                                                                                                                                                                                                                unzip wap-sp.zip decompressing the file (unzip + compressed file name)
svn add edit.php paytool_* svn add file
Svn add project name Add the project to svn and then update it
​​ svn ci -m "add" svn submits the file (svn+space+ci (meaning ci submission)+-m (-m indicates a descriptive statement)+"this is a descriptive statement")

Which one is better, Fedora or CentOs?

Although the operations of Fedora and CentOS are basically the same, my experience is still different.
The most obvious experience is that CentOs is more stable than Fedora. When using Fedora 11, problems always occur. One is the sound (the new sound effects used in Fedora 11), and the other is the wireless network problem. But CentOs generally does not have these annoying things. CentOs is indeed the server version of Linux, and its stability is still very good.
Then, there is the issue of system resource usage. On my system, running Fedora 11, I feel a little stuck sometimes, but this problem does not occur on CentOs.
Another thing is that the yum operation on Fedora is very slow and cannot be used as well as Ubuntu's apt-get. The speed is very slow. Only resetting the source can solve the problem, but it is very dangerous to change the update source casually. CentOs is much better than Fedora. With my 4M broadband, the update speed can average more than 200k, which is very good.
The above are the shortcomings of Fedora. But I have to admit that Fedora has advantages in terms of kernel and graphics. The latest 5.3 kernel of CentOs is still 2.6.18, while Fedora 11 is already 2.6.29. The gap between CentOs and Fedora 11 in terms of gnome version is even greater, and the visual gap is still huge. Perhaps for stability reasons, CentOs sacrifices visual experience.
For me, the stable CentOs is more suitable for me. I change systems very frequently, mainly considering the scalability and challenges of the system.
                                                                                                                           I felt that repeating simple operations was too boring, so I started to come into contact with Linux, and I was excited by the power of Linux. Been looking for a system that works for me. CentOs is probably my best choice.

Centos 6.5 updates

*Precision Time Protocol – originally a technology preview – is now fully supported. The following drivers support network timestamps: bnx2x, tg3, e1000e, igb, ixgbe, and sfc.
*OpenSSL has been updated to version 1.0.1.
*OpenSSL and NSS now support TLS 1.1 and 1.2.
* Several improvements have been added to KVM, including improved read-only support for VMDK and VHDX files, CPU hotplugging, and updated virt-v2v-/virt-p2v-conversion tools.
*Hyper-V and VMware drivers have been updated.
*Updated Evolution (2.32) and Libre Office (4.0.4).