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Set up SSH for Ubuntu

Step 1. Set up your default identity

  1. Open Terminal (Ctrl + Alt + T) and enter the following command to set up your default identity ssh-keygen

    Eg:

thirumal@thirumal:~/git$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/home/thirumal/.ssh/id_rsa):
  1. Press enter to accept the default key and path, /c/Users/<username>/.ssh/id_rsa.
  2. Enter and re-enter a passphrase when prompted.The command creates your default identity with its public and private keys. The whole interaction looks similar to this:
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/thirumal/.ssh/id_rsa
Your public key has been saved in /home/thirumal/.ssh/id_rsa.pub
The key fingerprint is:
SHA256:h4xKiyvxzOWkeXcwxmkAYSZ9AsDOikB14+vgzpTnjPs thirumal@thirumal
The key's randomart image is:
+---[RSA 3072]----+
|*o=o o           |
| *+ + .          |
|+  + .           |
|.o  . .o .       |
|+  ..+..S .      |
|+ .o*oB  .       |
| =.Xo= o         |
|. X.B . .        |
| ..*oE .         |
+----[SHA256]-----+

Step 2 Add the public key to your Account settings

  1. Copy your public key using the following command cat ~/.ssh/id_rsa.pub
  2. Add it to your account
  3. Return to your terminal and clone the repository using ssh [email protected]:M-Thirumal/installation_guide.git
Authentication Test
  1. Now run following command to test authentication from server command line terminal

Bitbucket

ssh -T [email protected]

Github

ssh -T [email protected]

Gitlab

ssh -T [email protected]

Origin URL Replacement

Go to repo directory and open vi .git/config file

Replace remote origin url (which starts with https) with following -

For Bitbucket - [email protected]:<username>/<repo>.git

For Github - [email protected]:<username>/<repo>.git

For Gitlab - [email protected]:<username>/<repo>.git

Troubleshoot

ssh "permissions are too open" error

Permissions 0777 for '/Users/username/.ssh/id_rsa' are too open.
It is recommended that your private key files are NOT accessible by others.
This private key will be ignored.

Keys need to be only readable:

chmod 400 ~/.ssh/id_rsa

If Keys need to be read-writable:

chmod 600 ~/.ssh/id_rsa