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Learn how to securely connect to another server using SSH from Google Cloud Build. Follow our step-by-step guide to troubleshoot common issues!
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This video is based on the question https://stackoverflow.com/q/62993457/ asked by the user 'LokiAlice' ( https://stackoverflow.com/u/5550759/ ) and on the answer https://stackoverflow.com/a/63035475/ provided by the user 'Jan Hernandez' ( https://stackoverflow.com/u/11529321/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to SSH to Another Server from Google Cloud Platform

Connecting to a server using SSH (Secure Shell) is a common task in cloud computing, and Google Cloud Platform (GCP) provides tools to simplify this process. However, users sometimes encounter errors that can prevent successful connections. In this guide, we will explore a common issue encountered when attempting to SSH to another server from GCP, and guide you through the solution.

The Problem

When trying to SSH from Google Cloud Build to another server, one might face the following error message:

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This error indicates that the permissions set on your private key (.pub file) are too permissive, which makes it insecure. SSH requires that the key file is only accessible to the user trying to connect.

Understanding the Root Cause

SSH employs strict security protocols, and one of these is the requirement that private key files must have secure permissions. If the key file is accessible by others, SSH will refuse to use it for connecting.

Error Breakdown:

Error Message: Indicates permission issues with the specified key file.

Location: /Users/tudouya/.ssh/vm/vm_id_rsa.pub

Permission Setting: 0644 means the owner has read and write permissions, while others have read permissions.

The Solution

To resolve the SSH connection issue, you need to modify the permissions of your private key file. Below are the steps you should follow:

Step 1: Change Key Permissions

Run the following command in your terminal:

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What This Does: This command changes the file permission to 600, meaning that only the owner (in this case, tudouya) has read and write access to the key file, while all other users are denied access.

Step 2: Verify User

Ensure that you are executing the command as the correct user tudouya. If you’re using a different account, this may not work as intended.

Step 3: Attempt SSH Again

After modifying the permissions, try executing your original SSH command again:

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Conclusion

By adjusting the permissions of your SSH private key, you can successfully connect to another server via SSH from Google Cloud Build. Always remember to maintain secure permissions for your key files to ensure safe and reliable connections.

If you continue to experience issues or have any questions, don’t hesitate to seek assistance or explore additional documentation related to SSH and Google Cloud Platform.