Configuring passwordless SSH between OCI VM hosts is a convenient way to securely access your virtual machines without having to enter a password each time. This article will guide you through the process of setting up passwordless SSH on Oracle Cloud Infrastructure (OCI) VM hosts, making it easier and more efficient to manage your virtual machines.
Prerequisites
Before we begin, make sure you have the following:
- An active Oracle Cloud Infrastructure account
- At least one OCI VM instance
- SSH client software installed on your local machine
Step 1: Generate SSH Key Pair
The first step is to generate an SSH key pair on your local machine. This key pair consists of a public key and a private key. The private key will be stored on your local machine, while the public key will be copied to the OCI VM hosts.
To generate the SSH key pair, open a terminal or command prompt on your local machine and run the following command:
ssh-keygen -t rsa
You will be prompted to provide a file name for the key pair. The default file name is id_rsa, but you can choose a different name if you prefer. Press Enter to accept the default file name.
Next, you will be asked to enter a passphrase. This passphrase adds an extra layer of security to your private key. You can choose to enter a passphrase or leave it blank for no passphrase. Press Enter to continue.
The SSH key pair will be generated and saved in the specified file location. By default, the private key will be saved as id_rsa and the public key as id_rsa.pub.
Step 2: Copy Public Key to OCI VM Hosts
Now that you have generated the SSH key pair, the next step is to copy the public key to the OCI VM hosts. This will allow you to authenticate using the private key stored on your local machine.
To copy the public key, you can use the ssh-copy-id command. Open a terminal or command prompt and run the following command:
ssh-copy-id -i ~/.ssh/id_rsa.pub username@VM_IP_Address
Replace username with your OCI VM username and VM_IP_Address with the IP address of your OCI VM instance. You will be prompted to enter the password for the VM user account.
Once you enter the password, the public key will be copied to the OCI VM host and added to the authorized_keys file in the ~/.ssh directory of the VM user account.
Step 3: Test Passwordless SSH
Now that the public key is copied to the OCI VM host, you can test passwordless SSH authentication. Open a terminal or command prompt on your local machine and run the following command:
ssh username@VM_IP_Address
Replace username with your OCI VM username and VM_IP_Address with the IP address of your OCI VM instance.
If everything is set up correctly, you should be able to log in to the OCI VM host without entering a password. You are now successfully using passwordless SSH authentication!
Conclusion
Configuring passwordless SSH between OCI VM hosts is a simple and secure way to access your virtual machines. By following the steps outlined in this article, you can easily set up passwordless SSH and streamline your SSH authentication process.
References
| Reference | Description |
|---|---|
| OCI Documentation | Official Oracle Cloud Infrastructure documentation |
| SSH Keygen Documentation | Documentation on generating SSH key pairs |
| SSH Copy ID Documentation | Documentation on copying SSH public key to remote hosts |