Keypairs

SSH keypairs are used to securely access compute instances.

A keypair has two parts:

Public key — uploaded to redu.cloud
Private key — kept on your machine

Never upload or share your private key.

1. Generate an SSH key

If you already have an SSH keypair, you can reuse it. Otherwise, generate a new one.

Linux / macOS


ssh-keygen -t ed25519 -C "you@example.com"

Windows PowerShell


ssh-keygen -t ed25519 -C "you@example.com"

Your public key file usually ends with .pub.

Example:


~/.ssh/id_ed25519.pub

2. Create a keypair

Go to:

Menu → Compute → Virtual Machines → SSH Keypairs

Then:

Click Create Keypair
Enter a name, for example my-keypair-01
Paste your public key
Submit the form

Public keys usually start with:


ssh-ed25519

or:


ssh-rsa

3. Use a keypair when creating an instance

When creating an instance:

Enable SSH access
Select your keypair
Launch the instance

After the instance is ready, use the SSH command shown in the UI.

Example:


ssh -p <port> ubuntu@<host>

You can copy the command from:

Compute → Virtual Machines → Instances → Actions → Copy SSH

If your private key has a passphrase, SSH will ask for it.

4. Delete a keypair

Only delete keypairs that are no longer needed.

Go to:

Menu → Compute → Virtual Machines → SSH Keypairs

Then:

Open the actions menu for the keypair
Choose Delete Keypair
Confirm the deletion

Troubleshooting

Permission denied publickey

Check that:

You selected the correct keypair when creating the instance
You are using the correct username for the image, such as ubuntu
Your security group allows SSH on port 22
Your private key permissions are correct


chmod 600 ~/.ssh/id_ed25519

Invalid public key format

The public key must be a single line starting with ssh-ed25519 or ssh-rsa.

Lost private key

Private keys cannot be recovered from redu.cloud.

Generate a new keypair and use it for new instances.