When a Compute Engine instance fails to launch, you should consider various factors that could cause the failure. Here are the two most relevant actions to take:
A. Determine whether your file system is corrupted.
A corrupted file system can prevent the instance from booting properly. You can check and repair the file system using a recovery process, such as attaching the boot disk to another instance for analysis.
D. Check whether your instance boot disk is completely full.
If the boot disk is full, the instance may not be able to start because the operating system needs some free disk space to function properly. You can check the disk usage and free up space if necessary.
Other Options:
B. Access Compute Engine as a different SSH user.
While accessing as a different SSH user might help if you have SSH access issues, it is unlikely to resolve a failure to launch the instance itself.
C. Troubleshoot firewall rules or routes on an instance.
Firewall rules and routes affect network traffic to and from the instance but are less likely to be the root cause of a launch failure.
E. Check whether network traffic to or from your instance is being dropped.
Similar to option C, dropped network traffic impacts connectivity but is not a primary cause for an instance failing to launch.
Therefore, the most appropriate actions are A and D to diagnose and resolve issues preventing your Compute Engine instance from launching.
A & D
https://cloud.google.com/compute/docs/troubleshooting/vm-startup#identify_the_reason_why_the_boot_disk_isnt_booting
Network issues shouldn't stop a compute engine from booting up so C & E are out.
B cant be true because how can u SSH if it doesnt boot
https://cloud.google.com/compute/docs/troubleshooting/vm-startup#identify_the_reason_why_the_boot_disk_isnt_booting
- Verify that your boot disk is not full.
If your boot disk is completely full and your operating system does not support automatic resizing, you won't be able to connect to your instance. You must create a new instance and recreate the boot disk.
- Verify that your disk has a valid file system.
If your file system is corrupted or otherwise invalid, you won't be able to launch your instance.
AD is the answer.
https://cloud.google.com/compute/docs/troubleshooting/vm-startup#identify_the_reason_why_the_boot_disk_isnt_booting
- Verify that your boot disk is not full.
If your boot disk is completely full and your operating system does not support automatic resizing, you won't be able to connect to your instance. You must create a new instance and recreate the boot disk.
- Verify that your disk has a valid file system.
If your file system is corrupted or otherwise invalid, you won't be able to launch your instance.
A & D!
If the failure is on the launch changing the SSH user will not help. Network traffic, Network routes, Firewall rules...are not influencing the instance boot!
AD should be the correct one, because launching VM failure does not depends on network connectivity of that VM. Network comes into the picture when vm boots.
I vote AD.
https://cloud.google.com/compute/docs/troubleshooting/vm-startup
Verify that your disk has a valid file system.
Verify that your boot disk is not full.
upvoted 3 times
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