What is cPanel Hosting?

cPanel Hosting is a web hosting service on a Linux operating system platform, managed through the popular cPanel control panel. With its intuitive graphical interface, cPanel allows users of all skill levels to comprehensively manage all aspects of their website without needing in-depth command-line knowledge. Comprehensive Management Features of cPanel File & FTP Management: Visually manage website files via File Manager and create FTP accounts for remote access. Database Management: Easily create and manage MySQL databases and users with the integrated phpMyAdmin tool. Domain & DNS Management: Add new domains (addon domains), create subdomains, and manage DNS records. Email Services: Set up email accounts with your own domain, create email forwarders, and manage anti-spam filters. Security Tools: Install free SSL certificates (AutoSSL), block malicious IPs, and password-protect directories. 1-Click Application Installer: Install hundreds of popular applications like WordPress, Joomla, and Magento in seconds with Softaculous. Backup & Restore: Easily create and restore full or partial backups of your website data with the Backup Wizard. Why Choose cPanel Hosting Services in Vietnam from VietHosting? As a reputable Vietnam Hosting provider, VietHosting offers a cPanel Hosting service in Vietnam built on a powerful infrastructure designed for optimal performance. We use Intel Xeon Platinum CPUs, high-speed Enterprise SSD RAID-10 storage, and the LiteSpeed Web Server for superior page load speeds. This robust foundation, combined with the security of CloudLinux OS and Imunify360, ensures your website operates with stability and safety. We are also transparent about the minimum resources provided for each account, a characteristic feature of our service quality: RAM: 2 GB CPU Core: 2 Cores Disk I/O: 100 MB/s IOPS: 4096 Entry Processes: 75 Number of Processes: 150 *These are the minimum parameters. Higher-tier hosting plans come with more CPU and RAM resources, as detailed in our service pricing.

What is DirectAdmin Hosting?

DirectAdmin Hosting is a web hosting service that operates on the Linux platform, managed through the DirectAdmin control panel. Known for its minimalist design philosophy, high speed, and performance, DirectAdmin is a powerful and cost-effective solution, especially suited for users who value simplicity and efficiency. Features and Advantages of DirectAdmin Minimalist & Fast Interface: Focuses on core features, allowing users to manage hosting quickly and reducing admin panel load times. Superior Performance: Consumes significantly fewer system resources (RAM, CPU) than other control panels, helping websites run more smoothly. High Stability: Highly regarded by the system administrator community for its stability and infrequent operational errors. Comprehensive Management: Fully equipped with management capabilities for files, FTP, MySQL databases, domains, DNS, and email. Cost-Effective: Lower licensing costs help reduce the final price of hosting services for the end customer. Why Choose DirectAdmin Hosting in Vietnam from VietHosting? As a reputable Vietnam Hosting provider, VietHosting offers a DirectAdmin Hosting service in Vietnam with a perfect balance of performance and cost. Our infrastructure is engineered for optimal performance, featuring Intel Xeon Platinum CPUs, high-speed Enterprise SSD RAID-10 storage, and the LiteSpeed Web Server for blazing-fast page loads. This robust foundation, combined with the security of CloudLinux OS and Imunify360, ensures your website operates with exceptional stability and safety. We are also transparent about the minimum resource parameters provided for each account, a characteristic feature of our service quality: RAM: 2 GB CPU Core: 2 Cores Disk I/O: 100 MB/s IOPS: 4096 Entry Processes: 75 Number of Processes: 150 *These are the minimum parameters. Higher-tier hosting plans come with more CPU and RAM resources, as detailed in our service pricing.

A KVM VPS is a Virtual Private Server created using KVM (Kernel-based Virtual Machine) virtualization technology. It is a true hardware-level virtualization solution that allows each VPS to operate as a completely independent physical server with its own dedicated RAM and CPU resources that are not shared. Key Advantages of KVM VPS Technology: 100% Dedicated Resources: Performance is not affected by other VPSs on the same physical server. Full Kernel Customization: Provides maximum flexibility by allowing deep modifications to the operating system kernel. Broad OS Compatibility: Supports Linux, Windows, and custom operating systems via ISO file installation. Superior Security: The completely isolated environment enhances security and effectively prevents local attacks. Why Choose KVM VPS in Vietnam from VietHosting? As a reputable Vietnam VPS provider, VietHosting offers a high-performance KVM VPS in Vietnam service, located in an international-standard Data Center. Our platform utilizes Intel Xeon Platinum CPUs and Enterprise SSD RAID-10 storage, ensuring outstanding processing performance for projects that demand high stability. Notably, with our capability to provide multiple clean IPv4 addresses (up to 64 IPv4 addresses, equivalent to a /26 block per VPS) and support for fast rDNS configuration, our service is the ideal choice for advanced SEO, marketing, or multi-project needs. You can see the actual network performance of our basic KVM VPS plan in the image below:

Large VPS, also known as a High-Resource VPS, is a premium line of Virtual Private Servers designed with exceptionally large resource configurations (CPU, RAM, disk space). It is the ideal solution for websites and applications that demand processing power equivalent to a mid-range dedicated server but with the cost-effectiveness and flexibility of a VPS, serving as a perfect, cost-optimized replacement for a dedicated server. When should you choose a Large VPS? When standard KVM VPS packages no longer meet your resource needs. For high-performance systems such as large E-commerce sites, ERP, CRM, or game applications. When you want the power of a dedicated server with the affordability and flexible management of a VPS. Why Choose a Large VPS in Vietnam (High-Resource VPS) from VietHosting? As a reputable Vietnam VPS provider, VietHosting offers the Large VPS in Vietnam (High-Resource VPS) line, built on the same powerful KVM virtualization technology, ensuring 100% dedicated resource allocation. The service runs on the highest-grade hardware platform with Intel Xeon Platinum CPUs and Enterprise SSD RAID-10 storage, guaranteeing superior performance for any demanding task. Like our KVM VPS service, Large VPS also supports the allocation of multiple clean IPv4 addresses (up to 64 IPv4 addresses, equivalent to a /26 block per VPS) and fast rDNS configuration, making it the perfect choice for large-scale projects that demand stability and abundant resources.

What is a Dedicated Server?

A Dedicated Server, also known as a Bare Metal Server, is a service that involves leasing an entire physical server dedicated to a single customer. This means you have full access to 100% of that server's resources—including CPU, RAM, storage, and bandwidth—without sharing with any other users. Key Characteristics of a Dedicated Server: Maximum Performance: All hardware resources are dedicated to you, delivering the highest performance for demanding applications. Superior Security: An isolated physical environment minimizes security risks from other users. Full Administrative Access (Root Access): You have the highest level of access to the server, allowing you to install any operating system and software to your exact needs. Reliability and Stability: Not being affected by the activities of other users ensures stability for critical services. When should you choose a Dedicated Server? Websites with extremely high traffic or large-scale e-commerce systems. Enterprise applications and databases that demand high processing performance. Projects that require specific software or OS configurations not supported in a shared environment. Why lease a Dedicated Server in Vietnam from VietHosting? As a reputable Vietnam Server provider, VietHosting offers Dedicated Servers for lease in Vietnam with rapid activation, typically within 4-8 hours, regardless of weekends or holidays. Our services are housed in a Tier 3 standard Data Center and include free KVM over IP, granting you full remote, hardware-level control (BIOS) of your server. Notably, VietHosting is one of the few providers in Vietnam capable of supplying large, clean IPv4 blocks, such as a /26 (64 IPv4 addresses), /25 (128 IPv4 addresses), and /24 (256 IPv4 addresses), along with fast rDNS support, meeting all specialized network and system requirements.

What is Colocation Service?

Colocation Service is a solution that allows businesses and individuals to place their own servers in a professional data center facility. Instead of investing in and operating a costly server room, you lease rack space to leverage an international-standard infrastructure. By using a colocation service, you benefit from: Professional Infrastructure: Your server operates in an environment with standard-compliant backup power, precision cooling systems, and automated fire suppression. High-Speed Network Connectivity: Enjoy high-bandwidth, stable, and redundant internet connections with multiple carriers. Strict Physical Security: The data center is protected 24/7 with multiple security layers, surveillance cameras, and biometric access control. Cost Savings: Reduce infrastructure investment and operational costs compared to building and maintaining a private server room. Colocation Services in Vietnam with VietHosting VietHosting provides colocation services in Ho Chi Minh City, located in a Tier 3 standard Data Center. We offer more than just a secure location; we provide initial technical setup support and optional Server Management services, giving you complete peace of mind for your operations.

What is an SSL Certificate?

SSL (Secure Sockets Layer) is a global security technology standard that encrypts the connection between a web server and a user's browser. An SSL Certificate is a data file installed on a server that acts as a digital "passport" to authenticate the website's identity and enable the HTTPS protocol (HTTP over SSL). When a website has SSL (HTTPS), it ensures: Data Encryption: All information exchanged between the user and the website (such as passwords, credit card details, personal data) is encrypted, preventing malicious actors from eavesdropping. Data Integrity: Data cannot be altered or forged during transmission. Authentication: SSL confirms that the user is connecting to the correct server for the website they intend to visit, not a fraudulent one. Today, SSL is a mandatory requirement for all websites, not only for security but also as a crucial factor for Google SEO ranking and building customer trust.

VietHosting | Kernel panic when installl AlmaLinux 9.x on KVM VPS

Q: What are Server Licenses?

Server Licenses grant the legal right to use specific software essential for managing, optimizing, or securing a server environment.Unlike typical desktop software licenses, these are often required for operating systems (like CloudLinux), control panels (such as cPanel or DirectAdmin), web servers (like LiteSpeed), virtualization software, or security applications running on your VPS or Dedicated Server. Purchasing or renting these licenses ensures you receive updates, support, and operate legally within the software provider's terms.

Q: Will I Get a Refund If I Cancel Service?

VietHosting guarantees a full refund to customers within 7 days of service registration for eligible services (like Web Hosting, Reseller Hosting, KVM VPS, Large VPS) if they are dissatisfied with the service quality. Please refer to our Refund Policy for detailed terms and conditions.

Posted: 16-07-2025
Last Updated: 26-07-2025
Category: VPS Guides

When installing modern operating systems like AlmaLinux 9 on a KVM VPS, you might encounter a critical "Kernel Panic" error that prevents the server from booting. This article explains the cause and provides a definitive solution.

What is a Kernel Panic?

A Kernel Panic is a critical system error that occurs when the operating system's kernel encounters a problem it cannot recover from. The system halts all operations to prevent further data corruption and displays an error message.

1. The Problem: Kernel Panic After Installation

If your VPS fails to boot after a fresh installation of AlmaLinux 9 and displays an error screen like the one below, the issue is likely an incompatibility with the virtual server's CPU configuration.

Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)

Kernel panic on AlmaLinux 9 KVM

The primary reason is that AlmaLinux 9 requires modern CPU instruction sets that are not available in KVM's default emulated CPU models (like kvm64 or qemu64). This causes the kernel to fail during initialization, triggering a panic.

2. The Solution: Change the VPS CPU Mode

To resolve this, we need to change the virtual machine's CPU mode within the hypervisor management panel to allow it to use the physical CPU's features. The two recommended modes are:

Host Model: This option mirrors the host CPU's model but filters out unsafe features. It provides a good balance between performance and stability.
Host Passthrough: This forwards all features of the physical CPU directly to the virtual machine. It offers the highest performance but may limit live migration capabilities.

3. Step-by-Step Instructions

You will need to log into your VPS provider's control panel or your hypervisor's management interface (like Proxmox, SolusVM, or Virtualizor) to perform these steps:

Step 1: Shut down your virtual private server (VPS).
Step 2: Navigate to your VPS configuration settings, usually under the "Hardware" or "Options" tab.
Step 3: Locate and open the CPU settings.
Step 4: Under "CPU Type" or "Mode", change the value from the default setting to Host Model or Host Passthrough (often simply labeled "Host").
Step 5: Save the changes and start the VPS.

After rebooting, your AlmaLinux 9 virtual server should now boot up successfully without the Kernel Panic error.

Tags:

VPS KVM AlmaLinux Troubleshooting Installation Kernel

Rating:

( Total: 1 ratings. Average 5, scale: 1 to 5 )

Frequently Asked Questions (FAQ)

Frequently Asked Questions and Essential Knowledge about VietHosting Services

cPanel Hosting is a web hosting service on a Linux operating system platform, managed through the popular cPanel control panel. With its intuitive graphical interface, cPanel allows users of all skill levels to comprehensively manage all aspects of their website without needing in-depth command-line knowledge.

Comprehensive Management Features of cPanel

File & FTP Management: Visually manage website files via File Manager and create FTP accounts for remote access.
Database Management: Easily create and manage MySQL databases and users with the integrated phpMyAdmin tool.
Domain & DNS Management: Add new domains (addon domains), create subdomains, and manage DNS records.
Email Services: Set up email accounts with your own domain, create email forwarders, and manage anti-spam filters.
Security Tools: Install free SSL certificates (AutoSSL), block malicious IPs, and password-protect directories.
1-Click Application Installer: Install hundreds of popular applications like WordPress, Joomla, and Magento in seconds with Softaculous.
Backup & Restore: Easily create and restore full or partial backups of your website data with the Backup Wizard.

Why Choose cPanel Hosting Services in Vietnam from VietHosting?

As a reputable Vietnam Hosting provider, VietHosting offers a cPanel Hosting service in Vietnam built on a powerful infrastructure designed for optimal performance. We use Intel Xeon Platinum CPUs, high-speed Enterprise SSD RAID-10 storage, and the LiteSpeed Web Server for superior page load speeds. This robust foundation, combined with the security of CloudLinux OS and Imunify360, ensures your website operates with stability and safety.

We are also transparent about the minimum resources provided for each account, a characteristic feature of our service quality:

RAM: 2 GB
CPU Core: 2 Cores
Disk I/O: 100 MB/s
IOPS: 4096
Entry Processes: 75
Number of Processes: 150

*These are the minimum parameters. Higher-tier hosting plans come with more CPU and RAM resources, as detailed in our service pricing.

DirectAdmin Hosting is a web hosting service that operates on the Linux platform, managed through the DirectAdmin control panel. Known for its minimalist design philosophy, high speed, and performance, DirectAdmin is a powerful and cost-effective solution, especially suited for users who value simplicity and efficiency.

Features and Advantages of DirectAdmin

Minimalist & Fast Interface: Focuses on core features, allowing users to manage hosting quickly and reducing admin panel load times.
Superior Performance: Consumes significantly fewer system resources (RAM, CPU) than other control panels, helping websites run more smoothly.
High Stability: Highly regarded by the system administrator community for its stability and infrequent operational errors.
Comprehensive Management: Fully equipped with management capabilities for files, FTP, MySQL databases, domains, DNS, and email.
Cost-Effective: Lower licensing costs help reduce the final price of hosting services for the end customer.

Why Choose DirectAdmin Hosting in Vietnam from VietHosting?

As a reputable Vietnam Hosting provider, VietHosting offers a DirectAdmin Hosting service in Vietnam with a perfect balance of performance and cost. Our infrastructure is engineered for optimal performance, featuring Intel Xeon Platinum CPUs, high-speed Enterprise SSD RAID-10 storage, and the LiteSpeed Web Server for blazing-fast page loads. This robust foundation, combined with the security of CloudLinux OS and Imunify360, ensures your website operates with exceptional stability and safety.

We are also transparent about the minimum resource parameters provided for each account, a characteristic feature of our service quality:

RAM: 2 GB
CPU Core: 2 Cores
Disk I/O: 100 MB/s
IOPS: 4096
Entry Processes: 75
Number of Processes: 150

*These are the minimum parameters. Higher-tier hosting plans come with more CPU and RAM resources, as detailed in our service pricing.

A KVM VPS is a Virtual Private Server created using KVM (Kernel-based Virtual Machine) virtualization technology. It is a true hardware-level virtualization solution that allows each VPS to operate as a completely independent physical server with its own dedicated RAM and CPU resources that are not shared.

Key Advantages of KVM VPS Technology:

100% Dedicated Resources: Performance is not affected by other VPSs on the same physical server.
Full Kernel Customization: Provides maximum flexibility by allowing deep modifications to the operating system kernel.
Broad OS Compatibility: Supports Linux, Windows, and custom operating systems via ISO file installation.
Superior Security: The completely isolated environment enhances security and effectively prevents local attacks.

Why Choose KVM VPS in Vietnam from VietHosting?

As a reputable Vietnam VPS provider, VietHosting offers a high-performance KVM VPS in Vietnam service, located in an international-standard Data Center. Our platform utilizes Intel Xeon Platinum CPUs and Enterprise SSD RAID-10 storage, ensuring outstanding processing performance for projects that demand high stability. Notably, with our capability to provide multiple clean IPv4 addresses (up to 64 IPv4 addresses, equivalent to a /26 block per VPS) and support for fast rDNS configuration, our service is the ideal choice for advanced SEO, marketing, or multi-project needs.

You can see the actual network performance of our basic KVM VPS plan in the image below:

Large VPS, also known as a High-Resource VPS, is a premium line of Virtual Private Servers designed with exceptionally large resource configurations (CPU, RAM, disk space). It is the ideal solution for websites and applications that demand processing power equivalent to a mid-range dedicated server but with the cost-effectiveness and flexibility of a VPS, serving as a perfect, cost-optimized replacement for a dedicated server.

When should you choose a Large VPS?

When standard KVM VPS packages no longer meet your resource needs.
For high-performance systems such as large E-commerce sites, ERP, CRM, or game applications.
When you want the power of a dedicated server with the affordability and flexible management of a VPS.

Why Choose a Large VPS in Vietnam (High-Resource VPS) from VietHosting?

As a reputable Vietnam VPS provider, VietHosting offers the Large VPS in Vietnam (High-Resource VPS) line, built on the same powerful KVM virtualization technology, ensuring 100% dedicated resource allocation. The service runs on the highest-grade hardware platform with Intel Xeon Platinum CPUs and Enterprise SSD RAID-10 storage, guaranteeing superior performance for any demanding task. Like our KVM VPS service, Large VPS also supports the allocation of multiple clean IPv4 addresses (up to 64 IPv4 addresses, equivalent to a /26 block per VPS) and fast rDNS configuration, making it the perfect choice for large-scale projects that demand stability and abundant resources.

A Dedicated Server, also known as a Bare Metal Server, is a service that involves leasing an entire physical server dedicated to a single customer. This means you have full access to 100% of that server's resources—including CPU, RAM, storage, and bandwidth—without sharing with any other users.

Key Characteristics of a Dedicated Server:

Maximum Performance: All hardware resources are dedicated to you, delivering the highest performance for demanding applications.
Superior Security: An isolated physical environment minimizes security risks from other users.
Full Administrative Access (Root Access): You have the highest level of access to the server, allowing you to install any operating system and software to your exact needs.
Reliability and Stability: Not being affected by the activities of other users ensures stability for critical services.

When should you choose a Dedicated Server?

Websites with extremely high traffic or large-scale e-commerce systems.
Enterprise applications and databases that demand high processing performance.
Projects that require specific software or OS configurations not supported in a shared environment.

Why lease a Dedicated Server in Vietnam from VietHosting?

As a reputable Vietnam Server provider, VietHosting offers Dedicated Servers for lease in Vietnam with rapid activation, typically within 4-8 hours, regardless of weekends or holidays.

Our services are housed in a Tier 3 standard Data Center and include free KVM over IP, granting you full remote, hardware-level control (BIOS) of your server.

Notably, VietHosting is one of the few providers in Vietnam capable of supplying large, clean IPv4 blocks, such as a /26 (64 IPv4 addresses), /25 (128 IPv4 addresses), and /24 (256 IPv4 addresses), along with fast rDNS support, meeting all specialized network and system requirements.

Colocation Service is a solution that allows businesses and individuals to place their own servers in a professional data center facility. Instead of investing in and operating a costly server room, you lease rack space to leverage an international-standard infrastructure.

By using a colocation service, you benefit from:

Professional Infrastructure: Your server operates in an environment with standard-compliant backup power, precision cooling systems, and automated fire suppression.
High-Speed Network Connectivity: Enjoy high-bandwidth, stable, and redundant internet connections with multiple carriers.
Strict Physical Security: The data center is protected 24/7 with multiple security layers, surveillance cameras, and biometric access control.
Cost Savings: Reduce infrastructure investment and operational costs compared to building and maintaining a private server room.

Colocation Services in Vietnam with VietHosting

VietHosting provides colocation services in Ho Chi Minh City, located in a Tier 3 standard Data Center. We offer more than just a secure location; we provide initial technical setup support and optional Server Management services, giving you complete peace of mind for your operations.

Server Licenses grant the legal right to use specific software essential for managing, optimizing, or securing a server environment.

Unlike typical desktop software licenses, these are often required for operating systems (like CloudLinux), control panels (such as cPanel or DirectAdmin), web servers (like LiteSpeed), virtualization software, or security applications running on your VPS or Dedicated Server. Purchasing or renting these licenses ensures you receive updates, support, and operate legally within the software provider's terms.

SSL (Secure Sockets Layer) is a global security technology standard that encrypts the connection between a web server and a user's browser. An SSL Certificate is a data file installed on a server that acts as a digital "passport" to authenticate the website's identity and enable the HTTPS protocol (HTTP over SSL).

When a website has SSL (HTTPS), it ensures:

Data Encryption: All information exchanged between the user and the website (such as passwords, credit card details, personal data) is encrypted, preventing malicious actors from eavesdropping.
Data Integrity: Data cannot be altered or forged during transmission.
Authentication: SSL confirms that the user is connecting to the correct server for the website they intend to visit, not a fraudulent one.

Today, SSL is a mandatory requirement for all websites, not only for security but also as a crucial factor for Google SEO ranking and building customer trust.

VietHosting guarantees a full refund to customers within 7 days of service registration for eligible services (like Web Hosting, Reseller Hosting, KVM VPS, Large VPS) if they are dissatisfied with the service quality. Please refer to our Refund Policy for detailed terms and conditions.

Yes, customers are welcome to send an email or submit a support ticket, and we will assist in migrating your data from other providers to VietHosting as quickly as possible, ensuring data security and completely free of charge.

Kernel panic when installl AlmaLinux 9.x on KVM VPS