虛擬私有雲網路說明 Reviews

The Symptom: The gcloud compute ssh command failed with Permission denied (publickey) and exit code 255, even though the IAP (Identity-Aware Proxy) tunnel was successfully established and the network path was REACHABLE. The Root Cause: The VM instance had OS Login enabled (either at the project or instance level). When OS Login is active, the VM expects authentication to be managed strictly through IAM roles. However, gcloud was attempting to connect using standard Metadata SSH keys generated in the Cloud Shell ~/.ssh/ directory. The VM ignored these metadata keys because OS Login takes precedence. The Resolution: The issue was resolved by explicitly setting the instance metadata enable-oslogin=FALSE. This forced the VM to fall back to the Metadata-based SSH method, allowing it to recognize the public key stored in the project metadata.

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