Uly.me

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Allow Key Access for user in SSH

Allow shared key access only for one user in SSH.

Disable the password authentication for one user in your SSH config. Edit /etc/ssh/sshd_config.

Match User username
  PasswordAuthentication no

Restart the SSH service.

service ssh restart

Copy user’s public key to the destination server’s authorized file in ~/.ssh/authorized_keys.

ssh-rsa AAAAxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx <-- public key goes on for miles

Back on your client, login via SSH. User will not be prompted for password since public key is already authorized on server.

ssh username@server

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Metadata URL

Here’s the metadata URLs for both AWS and GCP.

curl http://169.254.169.254/computeMetadata/v1/ -H "Metadata-Flavor: Google"
curl http://169.254.169.254/latest/meta-data/

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Json Formatter

If you have a json file that needs formatting, you can use a built-in tool in Python.

python -m json.tool sample.json

Output will be printed on screen. You can also send the output to a file.

python -m json.tool sample.json > sample2.json