Generate Ssh Key Google Compute Engine

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I need to set and test my web-app using Google cloud compute engine. How do I connect to an Instance Using ssh on Ubuntu Linux or Apple OS X based system?

Generate SSH key pair on Windows PC and add to Google Compute Engine as Project Wide SSH Key Pair. Google Cloud Platform provides few methods to authenticate to a VM instances on their platform. One of them is by using SSH keys. GCP doesn’t have a way to generate SSH key pairs automatically. Mar 31, 2020  You can also connect to instances through the Google Cloud Console, where Compute Engine automatically manages the full lifecycle of your keys, or by using the gcloud command-line tool in the SDK, where Compute Engine configures persistent SSH key metadata for you. Prepare an SSH key pair for use. To generate a new SSH key pair, you can use PuTTYgen (Windows) or the ssh-keygen command (Linux and Mac OS X). Find instructions on using PuTTYgen and instructions on using ssh-keygen. Log in to the Google Cloud Console and select your project. Navigate to the “Compute Engine - VM Instances” page and select the server you wish to connect to. Click the “Edit” link in the top control bar. By default, a new Google Compute Engine (GCE) VM instance does not have SSH keys pre-assigned to it, so you cannot 'retrieve' them as they don't exist—it's up to you to create them, or use a tool like gcloud (see below) which will prompt you to create them if you don't have SSH keys yet. WARNING: The private SSH key file for Google Compute Engine does not exist. WARNING: You do not have an SSH key for Google Compute Engine. WARNING: /usr/bin/ssh-keygen will be executed to generate a key. Generating public/private rsa key pair. At a high level, these are the steps: Install and run the gcloud SDK ($ gcloud init) Generate SSH key ($ gcloud compute ssh) Setup the FTP client (install and add the key file) Connect to the VM using the SFTP client. May 17, 2018  Google Compute Engine generates an SSH key for you and stores it in one of the following locations: By default, Compute Engine adds the generated key to project or instance metadata. If your account is configured to use OS Login, Compute Engine stores the generated key.


By default, you can always connect to an instance using ssh. This is useful so you can manage and configure your instances beyond the basic configuration enabled by gcutil or the REST API. The easiest way to ssh into an instance is to use gcutil command from your local Linux / OS X based systems. The following steps are required
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  1. Install gcutil/google sdk
  2. Authorize instance
  3. Verify instance status
  4. Create ssh keys
  5. Connect using gcutil or ssh client

Step #1: Install gcutil

gcutil runs on UNIX-based operating systems such as Linux and Mac OS X. To use gcutil, you must have Python 2.6.x or 2.7.x installed on your computer. gcutil does not support Python 3.x. Python is installed by default on most Linux distributions and Mac OS X. Open the Terminal and type the following command or to grab gcutil tool visiting this url.

Debian / Ubuntu / RHEL / CentOS Linux/OS X UNIX user type the following commands:

Open a terminal and type:
## Download IT ##
$ wget https://dl.google.com/dl/cloudsdk/release/google-cloud-sdk.tar.gz
$ tar -zxvf google-cloud-sdk.tar.gz
## INSTALL IT ##
$ bash google-cloud-sdk/install.sh
Sample outputs:

See how to install gcutil tool to manage Google Compute Engine on Linux / Unix for more information.

Step #2: Authenticating to Google Compute Engine

The syntax is:

If your project id is “apache-cluster”, enter:

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Sample outputs:
Open a web browser, and go to the specified URL. Click the Grant Access link. The page will display an authorization code. Copy this code. Paste the authorization code into the waiting gcutil auth terminal and press enter. Type the following command to cache project-id:

Step #3: Verify instance status

Type the following command:
$ gcloud compute instances list
Sample outputs:

Generate Ssh Key Google Compute Engineering

Note: instance-1 instance running in asia-east1-c zone.

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Step #4: Create ssh keys

The syntax is:

In this example, connect to db1 instance using ssh:
$ gcloud compute ssh db1

gcutil creates local files to store your public and private key, and copies your public key to the project. By default, gcutil stores ssh keys in the following files on your local system:

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  • $HOME/.ssh/google_compute_engine – Your private key
  • $HOME/.ssh/google_compute_engine.pub – Your public key

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Step #5: Connect using gcutil or ssh client

The syntax is:

OR

In this example, connect to the ‘instance-1’ instance using gcloud tool:

Sample outputs:

In this example, connect to the db1 (public ip 1.2.3.4) instance using ssh command:

Sample sessions:

To SSH into ‘db3’ in zone asia-east1-c, run:
gcloud compute ssh db3 --zone asia-east1-c

You can also run a command on the virtual machine. For example, to get a snapshot of the guest’s process tree, run:
gcloud compute ssh db3 --zone asia-east1-c --command 'ps -ejH'

If you are using the Google container virtual machine image, you can SSH into one of your containers with:
gcloud compute ssh db3 --zone asia-east1-c --container CONTAINER

How do I login as root user?

For security reasons, the standard Google do not provide the ability to ssh in directly as root. The instance creator and any users that were added using the –authorized_ssh_keys flag or the metadata sshKeys value are automatically administrators to the account, with the ability to run sudo without requiring a password. Type the following command to switch to root user:

Sample session:

What Is Google Compute Engine

Optional: Update your gcloud tools

Type the following command:

Sample outputs:

References:

Generate Ssh Key Google Compute Engine Command Line

  • $HOME/.bash_profile file example.
  • Google Compute Engine documentation.
  • Man pages: bash(1)

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