Retrieve cached system logs and real-time screenshots of ECS instances to troubleshoot failures such as unresponsive OS, abnormal restarts, or connection errors.
Prerequisites
The instance is in the Running (Running) state.
Background
ECS outputs system logs through the serial port, including startup logs and kernel failure or error logs. You can retrieve these logs to diagnose instance failures.
Limitations
This feature has the following limitations:
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Windows instances support screenshots only, not system logs.
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Retired instance types do not support system logs or screenshots.
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Instances created before January 1, 2018 do not support system logs or screenshots.
Procedure
Go to ECS console - Instances.
In the upper-left corner of the page, select a region and resource group.
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Find the target instance and click its ID. On the instance details page, click All Operations. Search for and click or .
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View the screenshot or system log.
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Example of a Linux instance system log:
Gxxx Welcome to CentOS Starting udev: -%G[ OK ] Setting hostname AliYunOS: [ OK ] Setting up Logical Volume Management: [ OK ] Checking filesystems Checking all file systems. [/sbin/fsck.ext4 (1) -- /] fsck.ext4 -a /dev/vda1 /dev/vda1 primary superblock features different from backup, check forced. /dev/vda1: ***** REBOOT LINUX ***** /dev/vda1: 28300/2621440 files (0.2% non-contiguous), 451117/10485248 blocks Unmounting file systems Automatic reboot in progress. Restarting system. Gxxx Welcome to CentOS
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Next steps
Troubleshoot common issues: