Today’s post is for developers. If you use the Git version control system with a service such as GitHub, GitLab or Bitbucket to host and manage your projects source codes, you know that by default Git connects to remotes using the HTTPS protocol, which requires you to enter username and password every time you run a command such as
git pull
or git push
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Using the SSH protocol, you can connect and authenticate to servers to use their services. The three mentioned services allow Git to connect via SSH instead of HTTPS. Connecting with public key encryption dispenses typing username and password for every Git command.
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You are going to see in this post how to use GitHub, GitLab and Bitbucket with SSH.
Make sure an SSH client in installed
In order to connect using the SSH protocol, an SSH client must be installed on your system. If you use openSUSE, it should be already installed by default.
Just to make sure, open the terminal and run:
I uploaded my /.ssh/idrsa.pub to Bitbucket's SSH keys as explained, but Git still asks me for my password at every operation (such as git pull).Did I miss something? It is a private repository (fork of another person's private repository) and I cloned it like this. Create a new repository, or reuse an existing one. Generate a new SSH key: ssh-keygen -t rsa -C '[email protected]' Copy the contents of the file /.ssh/idrsa.pub to your SSH keys in your GitHub account settings.
That command should output the version number of the SSH client being used:
In case the system informs that the ssh command was not found, you can install the OpenSSH client running:
Check for existing SSH keys
To connect using the SSH protocol, you need an SSH key pair (one private and the other public). If you have never used SSH, you can safely skip this topic and move on to the next. If you have ever used SSH (for instance, to remotely access a server), probably you already have an SSH key pair, in which case you don’t need to generate a new key pair.
To see if existing SSH keys are present, run:
That command should list the contents of the
~/.ssh
folder, in which the SSH client stores its configuration files:If you receive an error that there is no
~/.ssh
directory or there are no files in it, don’t worry: it means you haven’t created an SSH key pair yet. If that is the case, proceed to the next topic.By default, public SSH keys are named:
- id_dsa.pub;
- id_ecdsa.pub;
- id_ed25519.pub; or
- id_rsa.pub.
![Bitbucket add ssh key windows Bitbucket add ssh key windows](/uploads/1/2/6/0/126043328/531673065.jpg)
Inside my
~/.ssh
folder, I have an SSH key pair (id_rsa.pub
is the public key and id_rsa
is the private key) created a year ago (Jul 18 2018
).For security reasons, it is recommended that you generate a new SSH key pair at least once a year. If you already have an SSH key pair that was created more than a year ago, it is recommended that you proceed to the next topic.
If you already have an SSH key pair and want to reuse it, you can skip the next topic.
Generate a new SSH key pair
To generate a new SSH key pair, run the following command (replace
[email protected]
with your email address):It asks you where to save the private key (
id_rsa
).Press Enter to accept the default location.
If you already have a private key, it asks whether it should overwrite:
If that happens, type
y
and press Enter.Then, enter and re-enter a passphrase (think of it as a kind of password):
The SSH key pair is created in
~/.ssh
.The whole interaction should look similar to the following:
Add the private SSH key to the ssh-agent
If you don’t want to type your passphrase each time you use your SSH keys, you need to add it to the ssh-agent, which is a program that runs in background while you are logged in to the system and stores your keys in memory.
To start the ssh-agent in background, run the following:
That command outputs the ssh-agentprocess identifier:
Then, add your SSH private key to the ssh-agent:
Type your passphrase and press Enter:
![Bitbucket Bitbucket](/uploads/1/2/6/0/126043328/705587827.png)
The command confirms that the private SSH key has been added to the ssh-agent:
Add the public SSH key to your account
Once you have an SSH key and have added it to the ssh-agent, you can set up connecting via SSH. Let’s see how to do that for each of the three servers: GitHub, GitLab and Bitbucket.
In all the three cases, the process is similar. Start by copying your public SSH key (
~/.ssh/id_rsa.pub
) file contents to the clipboard using the xclip command:xclip is a command line utility that allows access to the graphical interface clipboard from the terminal. If it is not installed, you can install it running:
GitHub
Using a browser, go to the GitHub home page at github.com and sign in to your account.
In the upper-right corner of the page, click your profile photo, then click Settings:
In the user settings sidebar, click SSH and GPG keys. Then click New SSH key.
Fill in the Title field with a descriptive label for the new key (for example, the name of your computer) and paste your public key into the Key field. Finally, click Add SSH key:
Now the key appears in the list of SSH keys associated with your account:
GitLab
Using a browser, go to the GitLab home page at gitlab.com and sign in to your account.
In the upper-right corner of the page, click your profile photo, then click Settings:
In the User Settings sidebar, click SSH Keys.
Paste your public key in the Key field. Fill in the Title field with a descriptive label for the new key (for example, the name of your computer). Finally, click Add key:
Now the key appears in the list of SSH keys associated with your account:
Bitbucket
Using a browser, go to the Bitbucket home page at bitbucket.org and log in to your account.
In the lower-left corner of the page, click your profile photo, then click Bitbucket settings:
In the Settings sidebar, in the Security section, click SSH keys. Then, click Add key.
Fill in the Label field with a descriptive label for the new key (for example, the name of your computer) and paste your public key into the Key field. Finally, click Add key:
Now the key appears in the list of SSH keys associated with your account:
Test connecting via SSH
GitHub, GitLab and Bitbucket allow you to test whether SSH connection has been set up correctly before actually using it with Git.
GitHub
After you’ve added your SSH key to your GitHub account, open the terminal and run:
That command attempts an SSH remote access to GitHub.
If that is the first time you connect to GitHub via SSH, the SSH client asks you if it can trust the public key of the GitHub server:
Type
yes
and press Enter. The SSH client adds GitHub to the list of trusted hosts:Once added to the list of known hosts, you won’t be asked about GitHub’s public key again.
As this remote access via SSH is provided by GitHub just for testing, not for actual use, the server informs that you have successfully authenticated and terminates the connection:
If you completed the test successfully, now you can use SSH with GitHub.
The whole interaction should look similar to the following:
GitLab
If you have added your SSH key to your GitLab account, the test is very similar:
If you completed the test successfully, now you can use SSH with GitLab.
Bitbucket
If you have added your SSH key to your Bitbucket account, the test is very similar:
If you completed the test successfully, now you can use SSH with Bitbucket.
Clone a repository using SSH
Now that we’ve got our SSH keys set up, let’s see how to clone a Git repository using SSH instead of HTTPS.
GitHub
At GitHub, go to a project’s repository, click Clone or download and copy the URL to clone the repository using SSH:
The URL of a GitHub repository looks like:
Open the terminal and run the
git clone
command passing the copied URL as argument.Tip: to paste into the terminal, use Ctrl + Shift + V.
Note that now Git clones the repository without asking for a password:
GitLab
At GitLab, go to a project’s repository, click Clone and copy the URL to clone the repository using SSH:
The URL of a GitLab repository looks like:
Open the terminal and run the
git clone
command passing the copied URL as argument:Note that now Git clones the repository without asking for a password.
Bitbucket
At Bitbucket, go to a project’s repository, click Clone and copy the command to clone the repository using SSH:
Note that, differently from GitHub and GitLab that present the URL, Bitbucket presents the entire
git clone
command, including the URL.The URL of a Bitbucket repository looks like:
Open the terminal, paste and run the command you copied from Bitbucket:
Note that now Git clones the repository without asking for a password.
Reconfigure existing repositories to use SSH
The repositories we clone from now on using SSH will continue to use SSH for future Git commands such as
git pull
and git push
. But existing local repositories, previously cloned with HTTPS, will continue to use HTTPS, unless we set them up to use SSH.To do that, open the terminal and change the current directory to a local repository.
List the existing remote repositories and their URLs with:
That command should output something like:
Change your remote repository’s URL with:
Run
git remote -v
once more to verify that the remote repository’s URL has changed:Great. That done, Git will use SSH, instead of HTTPS, to synchronize that local repository with its remote equivalent.
References
I hope those tips can be useful to you as they have been to me since I started using Git. If you have any questions or trouble, don’t hesitate to comment! See you!
And always remember: have a lot of fun…
An SSH key is an access credential for the SSH (secure shell) network protocol. This authenticated and encrypted secure network protocol is used for remote communication between machines on an unsecured open network. SSH is used for remote file transfer, network management, and remote operating system access. The SSH acronym is also used to describe a set of tools used to interact with the SSH protocol.
SSH uses a pair of keys to initiate a secure handshake between remote parties. The key pair contains a public and private key. The private vs public nomenclature can be confusing as they are both called keys. It is more helpful to think of the public key as a 'lock' and the private key as the 'key'. You give the public 'lock' to remote parties to encrypt or 'lock' data. This data is then opened with the 'private' key which you hold in a secure place.
How to Create an SSH Key
Bitbucket Set Up Ssh Key
SSH keys are generated through a public key cryptographic algorithm, the most common being RSA or DSA. At a very high level SSH keys are generated through a mathematical formula that takes 2 prime numbers and a random seed variable to output the public and private key. This is a one-way formula that ensures the public key can be derived from the private key but the private key cannot be derived from the public key.
SSH keys are created using a key generation tool. The SSH command line tool suite includes a keygen tool. Most git hosting providers offer guides on how to create an SSH Key.
Generate an SSH Key on Mac and Linux
Both OsX and Linux operating systems have comprehensive modern terminal applications that ship with the SSH suite installed. The process for creating an SSH key is the same between them.
1. execute the following to begin the key creation
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This command will create a new SSH key using the email as a label
2. You will then be prompted to 'Enter a file in which to save the key.'
You can specify a file location or press “Enter” to accept the default file location.
You can specify a file location or press “Enter” to accept the default file location.
3. The next prompt will ask for a secure passphrase.
A passphrase will add an additional layer of security to the SSH and will be required anytime the SSH key is used. If someone gains access to the computer that private keys are stored on, they could also gain access to any system that uses that key. Adding a passphrase to keys will prevent this scenario.
A passphrase will add an additional layer of security to the SSH and will be required anytime the SSH key is used. If someone gains access to the computer that private keys are stored on, they could also gain access to any system that uses that key. Adding a passphrase to keys will prevent this scenario.
At this point, a new SSH key will have been generated at the previously specified file path.
4. Add the new SSH key to the ssh-agent
The ssh-agent is another program that is part of the SSH toolsuite. The ssh-agent is responsible for holding private keys. Think of it like a keychain. In addition to holding private keys it also brokers requests to sign SSH requests with the private keys so that private keys are never passed around unsecurly.
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Before adding the new SSH key to the ssh-agent first ensure the ssh-agent is running by executing:
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Once the ssh-agent is running the following command will add the new SSH key to the local SSH agent.
The new SSH key is now registered and ready to use!
Generate an SSH Key on Windows
Windows environments do not have a standard default unix shell. External shell programs will need to be installed for to have a complete keygen experience. The most straight forward option is to utilize Git Bash. Once Git Bash is installed the same steps for Linux and Mac can be followed within the Git Bash shell.
Windows Linux Subsystem
Modern windows environments offer a windows linux subsystem. The windows linux subsystem offers a full linux shell within a traditional windows environment. If a linux subsystem is available the same steps previously discussed for Linux and Mac can be followed with in the windows linux subsystem.
Summary
Bitbucket Add Ssh Key Windows
SSH keys are used to authenticate secure connections. Following this guide, you will be able to create and start using an SSH key. Git is capable of using SSH keys instead of traditional password authentication when pushing or pulling to remote repositories. Modern hosted git solutions like Bitbucket support SSH key authentication.