SSH uses a pair of public and private keys instead of a password, in order to authenticate and establish an encrypted communication channel between a client and a remote machine over the internet. The private key must be kept secret on your machine, but the public key can may be shared freely. To use SSH key pairs to access the Web of Science PostgreSQL Database,you'll need to generate a key pair (private and public), and upload the public key to the Compute Canada database.
Generate an SSH Key Pair
Open a new Terminal window
Typessh-keygen -b 4096 -t rsa
You will be prompted to enter a filename. By default, your keys will be saved asid_rsaand id_rsa.pub. Simply press Enter to confirm the default - there is no need to change this unless you have multiple keys! (Note: if you would like to change the default filename, you'll need to include the complete file path)
When prompted, enter a passphrase.
This will created a hidden directory called .sshthat contains both your public (id_rsa.pub) and private (id_rsa.) key files.
View your public key
In the same Terminal window, type cat .ssh/id_rsa.pub. This will print your public key. (Note: if you are not using the default key filename, please substitute your public key name in place of id_rsa.pub).
Copy this complete key, starting with sshand ending with a username such as user@Admins-MacBook-Pro.local
Paste this public key into the SSH Key field on the CCDB website. Click Add Key.(Note: it could take up to 30 minutes for you key to be registered on the Cluster).
Log in via SSH
To login to the remote host, open a new Terminal window and use this command: ssh <computercanadausername>@niagara.scinet.utoronto.ca. (Note: if you are not using the default key filename, you will need to specify the file path and name, for example: ssh -i .ssh/myprivatekeyname <computercanadausername>@niagara.scinet.utoronto.ca).The system will prompt you to enter the passphrase for your key. See instructions below if you would like to bypass having to enter your password each time you connect to the environment.
When connecting for the first time, you may see a warning that the authenticity of the host cannot be established. Enter "yes" to continue. This is a security feature that you should only see the first time you connect (the host is "known" moving forward).
Bypassing the Passphrase
If you do not want to have to enter this passphrase every time you log in to the environment, this can be bypassed using the ssh-agent program. This is a key manager, which means that it will store your private key in memory on your local computer and provides it whenever another program on your computer requests it for authentication. To use ssh-agent
Open a Terminal window on your local machine
Open run the command eval `ssh-agent`
Run the command ssh-add, and enter your passphrase when prompted (Note: if you are not using the default filename, you'll need to specify your key filenamessh-add~/.ssh/myprivatekeyname). The system will print Identity Added if successful.
That's it! Note that ssh agent needs to run in the background. If you have logged out or restarted your local computer, you may need to repeat these steps
If you wish to gain regular access to the Git Fusion host, you can specify the correct key in your ssh command. Alternatively, you can manage multiple SSH keys using the SSH 'config' file on your local machine. This file is located at '~/. ssh/config' when using Linux, Mac or 'Git Bash' on Windows.
Whether you use macOS or Linux, open your Terminal application. Run cd ~/.ssh/ in your Terminal. If the folder exists, run ls and check if a pair of key exists : id_ed25519 and id_ed25519.
You can generate keys with the 'ssh-keygen' command: $ ssh-keygen -t ed25519 Generating public/private ed25519 key pair. Enter file in which to save the key ($HOME/. ssh/id_ed25519): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in $HOME/.
macOS has a built-in SSH server, you only need to enable it in System Preferences. Choose Apple menu > System Preferences, and then click Sharing. Check the Remote Login service.
In the command prompt, use the ssh-keygen command: By default, the system will save the keys to [your home directory]/.ssh/id_rsa. Unless you are an expert you should use the default option and press Enter. The system will now generate the key pair and display the key fingerprint and a randomart image.
You can only upload and use one SSH key at a time at the SDCC. If you own multiple machines (e.g., a desktop and a laptop), then you can generate a public/private key pair on one machine, upload the public key to the LDAP server, and copy the private key to your other machines.
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