Knowledge Base›Troubleshooting›Troubleshoot ZStack Cloud VM instance startup and operating system failures
Troubleshoot ZStack Cloud VM instance startup and operating system failures
Issue/Introduction
This article applies when a VM instance fails to start or enter the operating system, the console displays a black or blue screen, the VM instance pauses abnormally or crashes, data is abnormal after a restart, or internal monitoring has no data. The issue might originate from virtual hardware configuration, system boot, file system corruption, virtio or GuestTools, QEMU logs, storage failures, a platform type mismatch after migration, or behavior inside the guest operating system.
Symptoms
- A VM instance fails to start, displays
no booting device foundon the console, enters the UEFI shell, or restarts repeatedly. - A Windows VM instance displays a blue or black screen, starts slowly, or cannot recognize a NIC or volume after migration.
- A VM instance pauses abnormally, times out during recovery, or crashes, and the QEMU logs contain an error such as
Resource temporarily unavailable.
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