Azure Virtual Machines (VMs) provide an efficient and scalable resolution for running workloads in the cloud. Nevertheless, like any technology, Azure VMs can sometimes encounter issues that prevent them from performing as expected. Understanding tips on how to troubleshoot widespread problems with Azure VMs is essential for maintaining the reliability and performance of your cloud infrastructure. In this article, we’ll discover a few of the most frequent issues with Azure VMs and provide steerage on how you can resolve them.

1. VM Does Not Start

One of the frequent points is when an Azure VM fails to start. This might be caused by several factors, including insufficient resources, configuration errors, or disk corruption.

Troubleshooting Steps:

– Check VM Status: First, make sure that the VM is definitely in a “Running” state. If it’s in a “Stopped” state, you may start it manually through the Azure portal or use PowerShell/CLI commands.

– Verify Resource Availability: Azure may be experiencing resource constraints in the region where your VM is located. Check the Azure standing web page to confirm if there are any ongoing outages or maintenance that might be affecting your region.

– Assessment Boot Diagnostics: Enable boot diagnostics to capture the VM’s boot logs. This can provide valuable insights into why the VM is failing to start, equivalent to disk issues or configuration problems.

– Inspect Disk and Storage Accounts: If the disk is corrupted or there are points with the storage account, the VM may fail to start. Use the Azure portal or PowerShell to confirm the disk’s standing and perform recovery actions if needed.

2. Slow Performance or High Latency

Another situation that customers frequently encounter with Azure VMs is slow performance or high latency, which can significantly impact the person expertise and productivity.

Troubleshooting Steps:

– Monitor Resource Utilization: Use Azure Monitor to check the CPU, memory, disk, and network utilization of the VM. If any resource is maxed out, consider resizing the VM or optimizing the workloads running on it.

– Check Network Connectivity: High latency can typically be a results of network bottlenecks. Confirm that the VM is situated within the right area relative to different resources it depends on, and be sure that virtual network (VNet) configurations are correct.

– VM Size and Type: Ensure that the VM dimension is suitable for the workload it’s handling. For instance, choosing a VM with more CPU or memory could be vital for resource-intensive tasks.

– Disk Performance: Check if the VM is using Premium SSD or Commonplace SSD, as the type of disk can have an effect on performance. Consider upgrading to a higher-performance disk type if necessary.

3. VM Network Connectivity Issues

Another widespread subject is when a VM loses network connectivity. This might prevent the VM from communicating with the internet or other resources in the identical virtual network.

Troubleshooting Steps:

– Confirm Network Security Group (NSG) Guidelines: Network Security Groups (NSGs) control inbound and outbound site visitors to VMs. When you’re having bother with connectivity, check that the NSG guidelines enable the necessary traffic (e.g., RDP or SSH).

– Evaluation Route Tables: Ensure that the VM is accurately routed within the network. Check any user-defined route tables (UDRs) associated with the subnet to confirm that the VM has proper network routing.

– Check Public IP and DNS Configuration: If the VM is meant to have public IP access, be certain that it is properly configured. Also, confirm the DNS settings to ensure that the VM can resolve domain names correctly.

– Check Firewall Settings: Each the Azure VM firewall and any on-premise firewall (if applicable) should be checked to make sure they’re not blocking mandatory traffic.

4. Authentication and Access Issues

Generally, customers expertise difficulties when trying to log right into a VM due to authentication points, comparable to incorrect credentials or misconfigured settings.

Troubleshooting Steps:

– Reset Password: In case you’re unable to access a Windows VM utilizing RDP, you may reset the password from the Azure portal by accessing the “Reset password” option under the VM settings.

– Check Consumer Roles: Ensure that the correct consumer roles and permissions are in place for accessing the VM. This may be managed through Azure Active Directory (AD) or Azure function-primarily based access control (RBAC).

– SSH Configuration (Linux VMs): For Linux VMs, make sure that the SSH keys are accurately configured and that the VM isn’t blocking SSH access. You could must restart the SSH service or reconfigure the VM to allow SSH connections.

– Distant Desktop Licensing: On Windows VMs, if a number of customers try to attach, be sure that the RDP licensing is accurately configured to support the number of simultaneous connections.

5. Disk Issues

Disk problems, reminiscent of disk space running out or corruption, are another common problem with Azure VMs. These problems may end up in slow performance and even system crashes.

Troubleshooting Steps:

– Monitor Disk Space: Use Azure Monitor to keep track of disk utilization and ensure there may be enough free space. If the disk is running out of space, you might have to add more storage or clean up unnecessary files.

– Run Disk Repair: For Windows VMs, use the built-in Disk Repair tool (chkdsk) to check for disk errors. For Linux VMs, you need to use file system repair utilities reminiscent of fsck.

– Resize Disk: In case your VM is running out of disk space, consider resizing the VM’s disk to allocate more storage.

Conclusion

While Azure Virtual Machines provide sturdy and scalable infrastructure for cloud workloads, troubleshooting points promptly is key to sustaining operational efficiency. By systematically analyzing the potential causes of points reminiscent of failed startups, slow performance, network connectivity problems, authentication challenges, and disk issues, you possibly can quickly identify and resolve most problems. Azure’s extensive monitoring and diagnostic tools provide essential insights to keep your VMs running smoothly, ensuring minimal disruption to your cloud environment.

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