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- Tutorial
- Release Notes and Announcements
- Release Notes
- Public Image Release Notes
- Announcements
- Temporary Solution for the Windows Blue Screen Issue Caused by CrowdStrike Security Software on July 19, 2024
- Announcement on Flexible Discounts for Spot Instances in Some Regions
- Updating Some Image Pip Package Management Tools for CentOS 7
- CentOS 8 End of Maintenance
- Discontinuation of Support for SUSE Commercial Images
- Price Reduction in Selected Availability Zones
- OrcaTerm Proxy IP Addresses Updates
- Pay-as-you-go Price Adjustments for Standard S3 CVMs in the Silicon Valley Region
- Vulnerability repairing for Linux images
- Stopping supporting for Ubuntu 10.04 images
- Solution to Tomcat Start Failure on Ubuntu14.04
- Upgrading Virtio network card drive for Windows CVMs
- About Configuration of Security Group Port 53
- Windows Server 2003 System Images End of Support Announcement
- End of Support for Windows Server 2008 R2 Enterprise Edition SP1 64-bit System Images
- Product Introduction
- Purchase Guide
- Getting Started
- Operation Guide
- Operation Guide Overview
- Use Limits
- Convenience Features
- Instances
- Creating Instances
- Managing Instance Launch Template
- Batch Sequential Naming or Pattern String-Based Naming
- Logging In to Linux Instances
- Logging in to Windows instance
- Adjusting Configuration
- View Instance Details
- Renaming Instances
- Resetting Instance Password
- Managing Instance IPs
- Changing Security Group
- Conversion from Pay-As-You-Go to Monthly Subscription
- Searching for Instances
- Exporting Instance List
- Renewing Instances
- Starting Up Instances
- Shutting Down Instances
- Restarting Instances
- Reinstalling System
- Using Tencent Cloud Automation Tools to execute commands
- Terminating/Returning Instances
- Enabling Instance Termination Protection
- Instance Repossession or Recovering
- Spot Instances
- Querying the Repossession Status of a Spot Instance
- No Charges When Shut Down for Pay-as-You-Go Instances
- Managing Roles
- Enabling and Disabling Hyper-Threading
- Reserved Instances
- Images
- Migrating Servers
- Maintenance Tasks
- Cloud Disks
- Networking
- Security
- Security Groups
- Protection of Sensitive Operations
- Managing Login Password
- Managing SSH Keys
- Spread Placement Group
- Unblocking Port 25
- Tags
- Monitoring and Alarms
- Sample Console Configuration
- Practical Tutorial
- Best Practices
- Choosing the CVM Model
- Setting up a Website
- Building an Environment
- Building a Website
- Building an Application
- Sending Emails through Port 465
- Building a Visual GUI
- Data Backup
- Uploading Local Files to CVM
- Copying Local Files to CVMs
- Uploading Files from Windows to a Windows CVM via MSTSC
- Uploading Files from MacOS to Windows CVM Using MRD
- Uploading Files from Linux to Windows CVM using RDP
- Uploading files via WinSCP to a Linux CVM from Windows
- Uploading Files from Linux or MacOS to Linux CVM via SCP
- Uploading Files from Linux to a CVM Using FTP
- Uploading Files from Windows to a CVM Using FTP
- Other CVM Operations
- CVM Access to COS via a Private Network
- Best Practices for Boot Mode Legacy BIOS and UEFI
- Recovering Data on Linux CVMs
- Managing Disk Space on Windows CVMs
- Changing Kernel of a Linux Instance Manually
- Setting Up Windows-based AD Domain on a CVM
- Network Performance Test
- High-throughput Network Performance Test
- Using USB/IP to Share USB Devices in Linux
- Using RemoteFx to Redirect USB Devices in Windows
- Using AVX-512 Instructions to Accelerate AI Applications on CVM
- Building Tencent SGX Confidential Computing Environment
- Configuring Persistent Memory in M6p Instances
- Calling Cloud APIs via Python to Share Custom Images in Batches
- Customizing DNS Configuration (Linux System)
- Operations Guide
- Initializing Data Disks
- Environment Configurations
- Installing Software
- User Data
- Work with Operating Systems
- System Activation
- System Updates
- System Shutdown
- Configuring High-performance Power Management
- Windows Recovery Mode
- Updating the Virtio ENI Driver
- Modifying SID
- Modifying VNC Resolution
- Ensuring Unique SIDs for CVMs Using Sysprep
- Use of the atop Monitoring Tools by Linux Instances
- Introduction to Linux Kernel Parameters
- Others
- Troubleshooting
- Instance-Related Failures
- CVM Login Failures
- Windows Instance Login Failures
- Windows Instance Login Failures
- An authentication error occurred when you tried to log in to a Windows instance remotely
- Failed to Reset the CVM Password or the CVM Password Is Invalid
- Connection to a Windows CVM through Remote Desktop was denied
- Requires network-level identity verification
- Problems occurred when you tried to log in to a Windows CVM remotely on Mac
- Failed to log in to a Windows CVM due to high CPU and memory usage
- Failed to connect to a remote computer through Remote Desktop
- Credentials Not Work
- Windows instance: no remote Desktop license server can provide license
- Remote Login Failure Due To Port Issues
- Linux Instance Login Failures
- Linux Instance Login Failures
- Unable to Log in to a Linux Instance via SSH Key
- Failing to log in to a Linux CVM due to high CPU and memory usage
- Remote Login Failure due to Port Issues
- VNC Login Error (Module is Unknown)
- VNC Login Error (Account Locked due to XXX Failed Logins)
- VNC Login Error (Login Failed with Correct Password)
- VNC or SSH Login Error (Permission Denied)
- Login Failure Due to /etc/fstab Configuration Errors
- sshd Configuration File Permissions
- Infinite Loop Call in /etc/profile
- Login Failure Due to Server Isolation
- Login Failure Due to High Bandwidth Occupation
- Remote Connect Failure Due to Security Group Settings
- Troubleshooting Linux Instance Issues via VNC and Rescue Mode
- Failed to shut down or restart a CVM
- Network Namespace Creation Failure
- Kernel and IO Issues
- Missing System bin or lib Soft Link
- Suspected Infection with Virus
- "no space left on device" Error During File Creation
- Linux CVM Memory Issues
- Network Related Failures
- Instance-Related Failures
- API Documentation
- History
- Introduction
- API Category
- Region APIs
- Instance APIs
- RunInstances
- DescribeInstances
- DescribeInstanceFamilyConfigs
- DescribeInstancesOperationLimit
- InquiryPriceRunInstances
- InquiryPriceResetInstance
- InquiryPriceResetInstancesType
- StartInstances
- RebootInstances
- StopInstances
- ResizeInstanceDisks
- ResetInstancesPassword
- ModifyInstancesAttribute
- EnterRescueMode
- ExitRescueMode
- InquirePricePurchaseReservedInstancesOffering
- InquiryPriceResizeInstanceDisks
- TerminateInstances
- ModifyInstancesProject
- ResetInstancesType
- DescribeInstancesStatus
- DescribeReservedInstancesConfigInfos
- DescribeZoneInstanceConfigInfos
- PurchaseReservedInstancesOffering
- ResetInstance
- DescribeInstanceTypeConfigs
- DescribeInstanceVncUrl
- Cloud Hosting Cluster APIs
- Image APIs
- Instance Launch Template APIs
- Making API Requests
- Placement Group APIs
- Key APIs
- Security Group APIs
- Network APIs
- Data Types
- Error Codes
- FAQs
- Related Agreement
- Glossary
Domain Name Resolution Failure (Linux System)
Last updated: 2024-12-23 16:07:43
Issue Description
The Linux instances cannot resolve domain name such as mirrors.tencentyun.com and mirror.ccs.tencentyun.com, and so on.
Possible Causes
DNS address is not configured or is configured incorrectly.
Firewall is configured with rules for port 53.
NSCD caching service for DNS is enabled.
The /lib64/libnss_dns.so.2 library file is missing, causing domain name resolution failure.
Solution
Follow the methods below to troubleshoot and locate the issue, and then choose the appropriate solution based on the actual situation:
1. Run the following command to check whether the DNS server is configured correctly.
cat /etc/resolv.conf #（tlinux/redhat/centos/rockylinux）cat /run/systemd/resolve/resolv.conf #(ubuntu)
If the DNS server is not configured correctly, modify the DNS server address. It is recommended to refer to the document customizing DNS configuration in Linux instances.
Tencent Cloud's DNS server:
nameserver 183.60.82.98nameserver 183.60.83.19
2. Run the following command to check if the firewall has added the rules for port 53.
iptables -L
If the firewall settings include the rules for port 53, disable the firewall or delete the rules. For more information on using the firewall, see Firewall.
3. Run the following command to check if the NSCD caching service for DNS is enabled.
systemctl status nscd
If the NSCD caching service is enabled, run the command
systemctl stop nscd to disable the NSCD caching service.4. Check if key library files such as /lib64/libnss_dns.so.2 are missing or modified.
ls -l /lib64/libnss_dns.so.2# The /lib64/libnss_dns.so.2 library file is generated by the glibc package, and you can check if the package has been modified by verifying glibc.rpm -V glibc
Check if the source file for the symbolic link exists, such as /usr/lib64/libnss_dns-2.17.so for CentOS 7. If it does not exist, you can download and replace it with the same version of OS downloaded from a normal server.
If /usr/lib64/libnss_dns-2.17.so still exists, you can fix it with a symbolic link.
ln -s /usr/lib64/libnss_dns-2.17.so /usr/lib64/libnss_dns.so.2
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