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Introduction to CentOS

CentOS is an enterprise Linux distribution based on the freely available source code provided by Red Hat Linux. Each version of CentOS will be supported for a decade (through security updates). New versions of CentOS are released about every two years, and each version of CentOS is updated periodically (about every six months) to support new hardware. In this way, a safe, low-maintenance, stable, highly predictable and highly repeatable Linux environment is established. CentOS is the abbreviation of Community Enterprise Operating System.

Major changes in CentOS 7

Compared to the Centos6 version, the biggest change to the user's basic operating process in Centos7 is that both the run-level hypervisor and the firewall have completely changed. Using firewall firewall in Centos7 version to replace Iptables firewall firewall in CentoS6 version is a major feature of CentoS7. There are two biggest benefits: the first is to support dynamic updates without restarting the service; the second is to add the firewall "zone" concept. Firewall is managed by graphical interface and tool interface, and the character interface management tool is firewall-cmd.

Summary of the New Features of CentOS 7

● only supports 64-bit CPU.

● Kernel3.10 version, which supports SwAP memory compression to significantly reduce Ⅳ O and improve performance.

NUMA (Unified memory access) is used for scheduling and memory allocation.

● uses XFS as the default file system

● has made a lot of improvements to NetworkManager and introduced team as a bundling method for link aggregation.

Add network management interface amelio.

● uses a dynamic firewall firewall.

● uses systemtm to invoke service scripts

● provides a number of improvements to KVM (kernel-based virtualization), such as the use of virtio-blk-data.

Pane improves fast O performance (technical preview) and supports PCI bridging, QEMU sandbox, and multi-queue

NIC, USB3.0 (Technology Preview), etc.

● introduces the Linux container Docker.

● compilation tool chain, including GCC4.8.x, gibc2.17, GDB7.6.1.

● includes programming languages such as Ruby2.0.0, Python2.7.5, Java7, etc.

● includes Apache2.4, MariaDB5.5, PostgreSQL9,2, and so on.

● replaces SysV with systemd on systems and services

● introduces Pacemaker cluster manager and replaces load balance with keepalived and HAProxy

Balance program Piranha

In addition, ● has redesigned and enhanced the installer Anaconda and used the bootloader

GRUB 2 .

Experimental environment

Virtual machine: VMware 14

Image files: CentOS-7-x86_64-DVD-1708.ISO

Disk space: 40g

Memory size: 2G

Swap (virtual memory): 4G

CD file link: link: https://pan.baidu.com/s/1AJPK2sCSegETvFbsfgOqCA extraction code: y23e

Warm Tip: decompress the package first, then use it!

CentOS 7 official website: https://www.centos.org/

Experimental purpose

Successfully install the centos 7 system on the virtual machine

Lab step 1. New Virtual Machine Wizard

1. Click "create New Virtual Machine" on the home page

two。 Click customize, and then click next

3. Click install operating system later, and then click next

4. Select the operating system, and then click next

5. Select the installation path, and then click next

6. Change the memory size, and then click next

7. Select the network mode, and then click next

8. Modify the disk size, and then click next

9. Put the custom disk file in the directory, and then click next

10. Custom hardware

11. Remove the sound card and printer

twelve。 Use the image file, click close, and then click finish

Second, install the centos 7 system

1. Enter the graphical installation of centos 7 system

two。 Select the Chinese language and click continue

3. Enter the software installation, select install with desktop, and click finish

4. Enter the installation location and partition manually.

5. Enter kdump, do not enable kdump backup mechanism, and then click finish

6. Start installing and setting the root password, and then click restart

7. Initial configuration

8. Change the time zone

9. Create a user and password

10. Complete the setup and enter the system interface

11. Enter the terminal and edit the network card information

twelve。 Now that you have completed all the installation steps, you can use the centos 7 system!

Summary

When installing ●, you must pay special attention to memory, disk space, swap and other installation conditions.

● omitted the picture demonstration of the default option operation in the operation step.

● uses VMware Workstation 14 to create and run multiple virtual machines.

● CentoS 7 provides a graphical way to install the system, and you can choose a variety of languages to install the system.

For installation.

● can be switched to the host through the Cml+Alt key combination in the virtual machine.

After ● installs the Centos 7 system, snapshots can be taken, and the snapshot feature makes virtual machines easier to maintain.

● VMware 14 provides network operation modes such as bridging mode, custom mode and so on.

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