How to ssh login to the instance from GCP VM

setup.js

// 1. Create a ssh key file with private and public key:
      ssh-keygen -t rsa -f ~/.ssh/[key_value name] -C [username]

// 2. Restrict access to the private key so that only myself can read it and nobody can write to it:
      chmod 400 ~/.ssh/ssh-vm-key

// 3. Add the public key to the instance metadata

// 4. Remote login to the linux server using ssh:
      ssh -i ~/.ssh/[key_value_name] [username]@[external address]
// 5. Or just using:
      ssh root@[ip address] would be fine