SSH

Create new SSH directory

1. Create an SSH directory if it doesn't exist: mkdir -p ~/.ssh.
2. Ensure the SSH directory has the correct permissions: chmod 700 ~/.ssh.

Check for existing SSH keys

Navigate to ~/.ssh. If it contains files named id_rsa and id_rsa.pub, these are the default private and public SSH keys respectively. You can use the same key pair for multiple systems or services, but this isn't the best for security if the key is compromised.

Creating a new SSH key pair

ssh-keygen -t rsa -b 4096 -C "youremail@example.com" -f ~/.ssh/custom_service_key

• -t option stands for type. RSA is one of the most widely used encryption algorithms.
• -b stands for bits.
• -C stands for comment, and is useful for idendifying which key is which, especially when you have multiple keys.
• -f stands for file name. The private key will be saved as ~/.ssh/custom_service_key and the public key as ~/.ssh/custom_service_key.pub.

Sharing public key

cat ~/.ssh/id_rsa.pub