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This article will explain in detail how to analyze and troubleshoot instances by using system logs and real-time screenshots of examples. The editor finds it very practical, so I share it for you as a reference. I hope you can get something after reading this article.

Syslog and screenshot

ECS is a virtualized cloud service. You cannot access the display device or take screenshots manually. However, ECS caches the system log of the last time the instance was started, restarted or shut down, and supports taking screenshots of the instance in real time. You can use these features to analyze and troubleshoot instances, such as diagnosing that the operating system is unresponsive, abnormal restart, or unable to connect to the instance.

System log

The system log of CVM ECS is an important part of OPS diagnosis. If you need to diagnose and analyze abnormal faults, you can obtain log information such as ECS instance startup and abnormal failures. The log printed out by the system through the serial port will contain two types of information, one is the log content when the system starts up, and the other is the log content when the system kernel is malfunctioning or abnormal. For more details, please see what is wrong with the Cloud Community blog operating system? Diagnostic logs to help.

Use restriction

Windows instances can only get screenshots, but not system logs.

The end-of-sale instance specifications do not support obtaining instance system logs and screenshots.

Instances created before January 1, 2018 do not support obtaining system logs and screenshots.

prerequisite

The instance must be in a Running state to get Syslog and screenshots. For more details, see Overview of connection instances.

Operation steps

You can view instance logs and instance screenshots through the console instance details page, the console instance list page or API.

Console instance details page operation

Log in to the ECS Management console.

Click the instance in the left navigation bar.

Select the region.

Select the instance that needs to troubleshoot the exception, and click the instance to enter the instance details page.

Click more > get the instance screenshot to view the screenshot, or click more > get the instance system log to view the log.

View the screenshot of the instance or the instance system log.

Example of screenshot of Windows instance:

Example of screenshot of Linux instance:

Example of Linux instance Syslog:

Console instance list page operation

Log in to the ECS Management console.

Click the instance in the left navigation bar.

Select the region.

Find the action menu for the instance that needs to troubleshoot the exception.

Click more > Operation and peacekeeping Diagnostics > get the screenshot of the instance to view the screenshot, or click more > Operation and peacekeeping diagnosis > get the instance system log to view the log.

View the screenshot of the instance or the instance system log.

API operation

Get screenshot of instance: GetInstanceScreenshot

Get the instance system log: GetInstanceConsoleOutput

This is the end of the method of analyzing and troubleshooting instances by using system logs and real-time screenshots of instances. I hope the above content can be helpful to you and learn more knowledge. If you think the article is good, you can share it for more people to see.

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