On December 8, 2020, the CentOS official website announced that CentOS Linux 8 would cease service on December 31, 2021. CentOS Linux 7 will stop service on June 30, 2024. CentOS Stream, which will serve as the upstream (development) branch of Red Hat Enterprise Linux after the end of CentOS Linux 8, is certainly less reliable and stable than CentOS Linux, and it is not recommended for use in production environments.(Quoted from: Notification from China University of Petroleum regarding the cessation of CentOS service)Today, we will experience the installation and configuration of openEuler, an open-source project incubated and operated by the OpenAtom Foundation.The OpenAtom Foundation is a non-profit organization dedicated to promoting the development of the global open-source community, established in June 2020 in Beijing, initiated by leading technology companies such as Alibaba, Baidu, Huawei, Inspur, 360, Tencent, and China Merchants Bank.We will complete our practical experience from several perspectives, including downloading the basic openEuler source ISO file, installation deployment, and Apache configuration experience.1. Downloading the Source ISO File

2. Basic Installation StepsWe will use VirtualBox to complete the experience process.1. Create a virtual machine (details omitted) and start the installation2. Select the installation language, either Chinese or English3. Installation information summary, configuration can be completed on one interfaceIf you have used CentOS, you will find it very familiar~4. Select installation source, local CD or online image, and configure software repositories, which is great!!5. Disk partitioning, using custom configuration, and introducing GiB“GiB”, “KiB”, “MiB” and others were defined in 1999 by the International Electrotechnical Commission (IEC) as binary units to indicate data sizes in “1024-based” measurements. This notation standard was later incorporated into the International Organization for Standardization (ISO) documents in 2008. Specifically, 1 GiB = 1024 MiB, 1 MiB = 1024 KiB. They are different from GB, MB, KB, where GB, etc., are 1000-based data units.

GiB

• 1 GiB = 1024 MiB
• 1 MiB = 1024 KiB
• 1 KiB = 1024 Bytes

GB

• 1 GB = 1000 MB
• 1 MB = 1000 KB
• 1 KB = 1000 Bytes

6. Software selection, three modes availableChange root password7. Complete installation source selection, disk allocation, software selection, hostname and IP configuration, password setting, etc., and start installationLog in to openEulerThere was a little incident, I forgot the password, let’s do a recoveryRestart the system, enter the letter e, then enter the interface input init=/bin/shCtrl+x to enter recovery modeInput mount -o remount,rw /passwd enter the new password twicetouch /.autorelabelexitRestart the system3. Apache Configuration Experience1. Check the system kernel version and disk distribution2. Modify the IP addressvi /etc/sysconfig/network-scripts/ifcfg-enp0s3Restart the network service systemctl restart NetworkManager3. Install Apache service related packagesyum install httpdyum list | grep ‘httpd’ to confirm that the HTTPD related packages have been installed4. Complete basic configuration, test page, and restart servicea. Modify the main configuration filevi /etc/httpd/conf/httpd.confb. Start the Apache service systemctl start|stop|restart httpd.servicec. Create a test pageAccess the testThus, we have completed the basic installation and configuration experience of openEuler. From the overall process, we can use our existing CentOS knowledge and skills to operate and use openEuler.Further Reading:A New Alternative to CentOS – Practical Experience with Domestic LinuxCentOS Replacement Learning Notes – AlmaLinux Installation ChapterSource: Beijing Zhangyun Technology Co., Ltd. Cloud Computing. Network Security Service Provider

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