


How to solve the problem that the centos virtual machine cannot be started
How to solve the problem that the centos virtual machine cannot be started?
A centos desktop system created with VMware virtual machine. A problem occurred when the system started. After starting certmonger, the interface got stuck and the graphical interface could not be entered, as shown in the figure:
Solution:
First, Ctrl Alt F2 to enter the command line interface, log in as the root user, check whether the /etc/X11/xorg.conf file exists, if it exists, execute the command:
mv /etc/X11/xorg.conf /etc/X11/old_xorg.conf
Restart the system and see if normal.
Then Ctrl Alt F2 to enter the command line interface, log in as the root user, and modify the file /etc/inittab
vim/etc/inittab
# inittab is only used by upstart for the default runlevel. # ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM. # System initialization is started by /etc/init/rcS.conf # Individual runlevels are started by /etc/init/rc.conf # Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf # Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf, # with configuration in /etc/sysconfig/init. # For information on how to write upstart event handlers, or how # upstart works, see init(5), init(8), and initctl(8). # Default runlevel. The runlevels used are: # 0 - halt (Do NOT set initdefault to this) # 1 - Single user mode # 2 - Multiuser, without NFS (The same as 3, if you do not have networking) # 3 - Full multiuser mode # 4 - unused # 5 - X11 # 6 - reboot (Do NOT set initdefault to this) # id:5:initdefault:
Change the last line id:5:initdefault:
to id:3:initdefault:
to enter the command line interface by default when booting.
After restarting and entering the command line, execute startx to enter the system graphical interface!
Related reference: centOS tutorial
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CentOS is suitable for building powerful and reliable servers. Its advantages include: 1. Stability and reliability, support cycle up to 10 years; 2. Security, built-in SELinux and regular security patches; 3. Compatibility and ecosystem, highly compatible with RHEL, with a rich software warehouse; 4. Performance optimization, suitable for various hardware platforms and providing kernel tuning.

CentOS will continue to evolve in the future, and users should choose alternative distributions. 1) Evaluate the requirements, choose such as RockyLinux or AlmaLinux, and focus on stability and support. 2) Develop a migration plan, use tools such as CentOS2Rocky, and pay attention to testing and verification. 3) Plan early, maintain contact with the open source community, and ensure a smooth transition.

CentOS is widely selected as a server operating system because it is stable, secure and free. 1.CentOS is based on RHEL, providing enterprise-level stability and a life cycle of up to 10 years. 2. It has rich software packages and strong community support. 3. Simple installation, use yum management software package, and intuitive configuration. 4. Improve server management efficiency through command line tools, regular backups and log management. 5. Optimize server performance by adjusting kernel and network parameters.

CentOS will continue to develop through CentOSStream in the future. CentOSStream is no longer a direct clone of RHEL, but is part of RHEL development. Users can experience the new RHEL functions in advance and participate in development.

The transition from development to production in CentOS can be achieved through the following steps: 1. Ensure the consistent development and production environment, use the YUM package management system; 2. Use Git for version control; 3. Use Ansible and other tools to automatically deploy; 4. Use Docker for environmental isolation. Through these methods, CentOS provides powerful support from development to production, ensuring the stable operation of applications in different environments.

CentOSStream is a cutting-edge version of RHEL, providing an open platform for users to experience the new RHEL functions in advance. 1.CentOSStream is the upstream development and testing environment of RHEL, connecting RHEL and Fedora. 2. Through rolling releases, users can continuously receive updates, but they need to pay attention to stability. 3. The basic usage is similar to traditional CentOS and needs to be updated frequently; advanced usage can be used to develop new functions. 4. Frequently asked questions include package compatibility and configuration file changes, and requires debugging using dnf and diff. 5. Performance optimization suggestions include regular cleaning of the system, optimizing update policies and monitoring system performance.

The reason for the end of CentOS is RedHat's business strategy adjustment, community-business balance and market competition. Specifically manifested as: 1. RedHat accelerates the RHEL development cycle through CentOSStream and attracts more users to participate in the RHEL ecosystem. 2. RedHat needs to find a balance between supporting open source communities and promoting commercial products, and CentOSStream can better convert community contributions into RHEL improvements. 3. Faced with fierce competition in the Linux market, RedHat needs new strategies to maintain its leading position in the enterprise-level market.

RedHat shut down CentOS8.x and launches CentOSStream because it hopes to provide a platform closer to the RHEL development cycle through the latter. 1. CentOSStream, as the upstream development platform of RHEL, adopts a rolling release mode. 2. This transformation aims to enable the community to get exposure to new RHEL features earlier and provide feedback to accelerate the RHEL development cycle. 3. Users need to adapt to changing systems and reevaluate system requirements and migration strategies.


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