Instances launched using Oracle Linux, CentOS, or Ubuntu images use an SSH key pair instead of a password to authenticate a remote user (see Security Credentials). A key pair consists of a private key and public key. You keep the private key on your computer and provide the public key every time you launch an instance.

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Apr 02, 2019  Installation of SSH Keys on Linux - A Step-By-Step Guide. Outlined below is a step-by-step guide detailing the process of installing SSH Keys on a Linux server: The first step in the installation process is to create the key pair on the client machine, which. Generate an SSH Key Pair on Oracle Solaris. Complete these steps to generate an SSH key pair on UNIX and UNIX-like systems. Run the ssh-keygen command. You can use the -t option to specify the type of key to create. Oct 18, 2019  Creating an SSH Key Pair on Linux 1) Open a shell or terminal for entering the commands. 2) At the prompt, enter ssh-keygen and provide a name and passphrase when prompted. The keys will be created with the default values: RSA keys of 2048 bits. You can generate an SSH key pair directly in cPanel, or you can generate the keys yourself and just upload the public one in cPanel to use with your hosting account. When generating SSH keys yourself under Linux, you can use the ssh-keygen command.

When you connect to an instance using SSH, you provide the path to the key pair file in the SSH command. You can have as many key pairs as you want, or you can keep it simple and use one key pair for all or several of your instances.

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To create key pairs, you can use a third-party tool such as OpenSSH on UNIX-style systems (including Linux, Solaris, BSD, and OS X) or PuTTY Key Generator on Windows.

Prerequisites

If you're using a UNIX-style system, you probably already have the ssh-keygen utility installed. To determine if it's installed, type ssh-keygen on the command line. If it's not installed, you can download OpenSSH for UNIX from http://www.openssh.com/portable.html and install it.

If you're using a Windows operating system you will need PuTTY and the PuTTY Key Generator. Download PuTTY and PuTTYgen from http://www.putty.org and install them.

Creating an SSH Key Pair on the Command Line

1. Open a shell or terminal for entering the commands.

2. At the prompt, enter ssh-keygen and provide a name and passphrase when prompted.

   The keys will be created with the default values: RSA keys of 2048 bits.

Alternatively, you can type a complete ssh-keygen command, for example:

The command arguments are shown in the following table:

Creating an SSH Key Pair Using PuTTY Key Generator

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1. Find puttygen.exe in the PuTTY folder on your computer, for example, C:Program Files (x86)PuTTY. Double-click puttygen.exe to open it.

2. Specify a key type of SSH-2 RSA and a key size of 2048 bits:

   • In the Key menu, confirm that the default value of SSH-2 RSA key is selected.
   • For the Type of key to generate, accept the default key type of RSA.
   • Set the Number of bits in a generated key to 2048 if it is not already set.
3. Click Generate.

4. Move your mouse around the blank area in the PuTTY window to generate random data in the key.

   When the key is generated, it appears under Public key for pasting into OpenSSH authorized_keys file.

5. A Key comment is generated for you, including the date and time stamp. You can keep the default comment or replace it with your own more descriptive comment.
6. Leave the Key passphrase field blank.

7. Click Save private key, and then click Yes in the prompt about saving the key without a passphrase.

   The key pair is saved in the PuTTY Private Key (PPK) format, which is a proprietary format that works only with the PuTTY tool set. Pes 2017 cd key generator download.

   You can name the key anything you want, but use the ppk file extension. For example, mykey.ppk.
   

8. Select all of the generated key that appears under Public key for pasting into OpenSSH authorized_keys file, copy it using Ctrl + C, paste it into a text file, and then save the file in the same location as the private key.

   (Do not use Save public key because it does not save the key in the OpenSSH format.)

   You can name the key anything you want, but for consistency, use the same name as the private key and a file extension of pub. For example, mykey.pub.
   

9. Write down the names and location of your public and private key files. You will need the public key when launching an instance. You will need the private key to access the instance via SSH.

Now that you have a key pair, you're ready to launch instances as described in Creating an Instance.

To access your Compute instances using SSH, generate an SSH key pair, associate the public key with your instances, and use the private key to log in to the instances using SSH.

Caution:

Keep your SSH keys secure. Lay down policies to ensure that the keys aren’t lost or compromised when employees leave the organization or move to other departments. If you lose your private key, then you can’t access your instances. For business continuity, ensure that the SSH keys of at least two IT system administrators are added to your instances.

Topics

Generate an SSH Key Pair on UNIX and UNIX-Like Systems

Use the following procedure to generate an SSH key pair on UNIX and UNIX-like systems:

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1. Run the ssh-keygen command.

   You can use the -t option to specify the type of key to create.

   For example, to create an RSA key, run:

   You can use the -b option to specify the length (bit size) of the key, as shown in the following example:

2. The command prompts you to enter the path to the file in which you want to save the key. Mh generations key quests guild.

   A default path and file name are suggested in parentheses. For example: /home/user_name/.ssh/id_rsa. To accept the default path and file name, press Enter. Otherwise, enter the required path and file name, and then press Enter.

3. The command prompts you to enter a passphrase.

   The passphrase is not mandatory if you want to log in to an instance created using an Oracle-provided image. However, it is recommended that you specify a passphrase to protect your private key against unauthorized use.

   Note:

   With some images provided on Oracle Marketplace, the use of a passphrase might be mandatory.

4. When prompted, enter the passphrase again to confirm it.

The command generates an SSH key pair consisting of a public key and a private key, and saves them in the specified path. The file name of the public key is created automatically by appending .pub to the name of the private key file. For example, if the file name of the SSH private key is id_rsa, the file name of the public key would be id_rsa.pub.

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Make a note of the path and file names of the private and public keys. When you create an instance, you must specify the SSH public key value. When you log in to an instance, you must provide the path to the corresponding SSH private key and you must enter the passphrase when prompted.

Generate an SSH Key Pair on Windows

You can generate an SSH key pair on a Microsoft Windows machine by using an application such as PuTTY. See the tutorial, Creating SSH Keys for Use with Oracle Cloud Services.