Log in with an SSH private key on Linux and macOS
- Sep 15, 2019 To prevent re-entering passphrase we add SSH-keys to SSH-agent running on your macOS system using the following command: ssh-add -K /.ssh/your-secure-ssh-key-name Above command will ask for passphrase ones. It stores your passphrase in macOS keychain and add SSH-key in SSH-agent, and persist until we restart the system. On restart all keys added in SSH-agents are reset and we need to re-add them.
- Sep 28, 2016 First, using ssh-add to load your key into the agent again. Then, using ssh-add -K -d to delete the key in agent and the passphrase in Keychain. Finally, using ssh-add -K to make sure nothing will be automatically loaded. For those who still feel unhappy, find these files by find and delete them.
This article demonstrates how to use a private key to log in to a Linux速server by using a private key with a Terminal session on macOS速. However,you can follow the same process to use a private key when using anyterminal software on Linux.
Now, when prompted for passphrase upon first connection (no ssh-add etc) it does indeed get stored with keychain even though it is not visible in keychain, nor visible in the agent. In the ssh log = debug2: using passphrase from keychain ( with reference to com.apple.ssh.passphrases ).
Note: For information about using Secure Shell (SSH) private keys on Microsoft速 Windows速 operating systems, see Logging in with an SSH Private Key on Windowsand Generate RSA keys with SSH by using PuTTYgen.
Prerequisites
Mac os 10.13 macbook air 2012. To complete this process, you need the following software applications:
- SSH client software that is installed on your Linux or macOS operating system by default.
- Your favorite text editor. This example uses the vim text editor.
- Your private key. For more information about generating a key on Linux or macOS, see Connect to a server by using SSH on Linux or Mac OS X.
Log in with a private key
Using a text editor, create a file in which to store your private key. This example uses the file deployment_key.txt.
To edit the file in vim, type the following command:
After the editor starts, press i to turn on insert mode.
Paste your private key, such as the one in the following image, into the file.Be sure to include the BEGIN and END lines.
To save your changes, press Esc.
Type :wq to write the file and return to the command line.
Run the following command to change the file permissions to 600 to secure the key. You can also set them to 400.This step is required:
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Use the key to log in to the SSH client as shown in the following example, which loads the key in file deployment_key.txt, and logs in as user demo to IP 192.237.248.66:
When you are prompted to confirm the connection, type yes and then press Enter.
If your SSH key requires a password, enter it when prompted to complete the connection.
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You will use the Terminal application on Mac OS X to generate an SSH key which will allow you to login to your server without manually entering a password, while giving you a higher level of security that comes from using key pairs.
Mac OS X Terminal
The terminal provides you with a text-based command line interface to the Unix shell component of Mac OS X. In order to get started with it, follow these steps:
- Open your Finder and select “Utilities” from the “Go” menu bar.
- Find the Terminal application in the list of utilities.
- Double-click the Terminal application to start it.
Once you’ve launched the terminal, you’ll see a screen with a prompt that contains your username as well as the name of your machine.
Generating an SSH key
An SSH key consists of a pair of files. One is the private key, which you should never give to anyone. The other is the public key. You will need a public key to log into cloud servers you provision. When you generate your keys, you will use ssh-keygen to store the keys in a safe location so you can bypass the login prompt when connecting to your server.
To generate SSH keys in Mac OS X, follow these steps:
Change Ssh Key Passphrase
- Enter the following command in the Terminal window. This starts the key generation process. When you execute this command, the
ssh-keygenutility prompts you to indicate where to store the key. - Press the ENTER key to accept the default location. The
ssh-keygenutility prompts you for a passphrase. - Type in a passphrase. You can also hit the ENTER key to accept the default (no passphrase). However, this is not recommended.
Please note that you will need to enter the passphrase a second time to continue.
After you confirm the passphrase, the system generates the key pair.
Your private key is saved to the id_rsa file in the .ssh directory and is used to verify the public key you use belongs to the same cloud server. It's important to never share your private key with anyone, it is equivalent of your password!
Forgot Ssh Passphrase Mac
Your public key is saved to the id_rsa.pub file and it is the key you'll upload to our cloud service. You can save this key to the clipboard by running this: