How to resolve Vminit log exceptions in a Windows instance-阿里云帮助中心

This topic describes how to identify and resolve Vminit log exceptions in a Windows instance by analyzing key error messages.

Symptoms

The Vminit logs of a Windows instance contain key error messages. The keywords from these messages are listed in the Vminit log information table.

Possible causes

The following table describes the keywords found in the Vminit logs of a Windows instance and their possible causes.

Table 1. Vminit log information
Category	Log keyword	Possible cause
Files and disks	extend_disk_error	Failed to scale out the disk
	online_disk_error	Failed to bring the disk online
	import_disk_error	Failed to import the dynamic disk
	format_disk_error	Failed to format the disk
	no_system_disk	No system disk or the system disk is corrupted
Registry	registry_access_error	Registry access error
Drivers	install_virtio_error	Failed to install virtio
	disk_cannot_extend	The disk cannot be scaled out
	disk_data_loss	Disk data loss
	netkvm_start_fail_onmoc	Legacy network interface card driver
Management commands	unknown_operation	Unknown management command
	config_passwd_error	Failed to change the password
	start_assist_error	Failed to start Cloud Assistant
	config_ntp_error	Failed to configure NTP
	meta_server_error	Failed to connect to Meta Server
Others	sysprep_not_ready	Sysprep is not complete
Others	unknown_win_version	System version unknown

Solutions

Instructions

Find the possible cause based on the keyword from the Vminit log and resolve the issue. After the issue is resolved, run the operation again. The error message will no longer appear in the Vminit log.

Important

If you perform risky operations, such as modifying instances or data, create a snapshot beforehand to ensure disaster recovery and fault tolerance. For more information, see Snapshot overview.
If you granted authorization or submitted security information, such as logon accounts and passwords, on the Alibaba Cloud platform, promptly change the related security information.

Example

For example, if you cannot change the password of a Windows instance in the ECS console, you can log on to the instance to check the Vminit log. If the log contains the keyword config_passwd_error, it indicates that Vminit failed to change the instance password.

In this case, check whether third-party security software is installed on the instance. If it is, uninstall the software by performing the following steps:

Remotely connect to the ECS instance.
For more information, see Select a method to connect to an ECS instance.
Check for and uninstall any third-party security software on the ECS instance.
For more information about how to uninstall third-party security software, see the uninstallation procedure in How to resolve failures of key Vminit operations in a Windows instance?.
In the ECS console, restart the instance.
For more information, see Restart an instance.
In the ECS console, change the instance password.
For more information, see Reset the logon password of an instance.