Step by Step :: Password less ssh login
First we will see, how to install the openssh in your ubuntu machine.
1) Type the below command in your console
1 | $ sudo apt-get install openssh-server openssh-client |
2) Once it get installed, see whether you have the sshd dameon is running in your system or not.
1 2 | $ps -ef | grep ssh root 3878 1 0 23:26 ? 00:00:00 /usr/sbin/sshd -D |
3) Now you are ready to use the ssh connection. Lets test the ssh connection to the localhost itself.
1 2 3 4 5 6 | $ ssh localhost The authenticity of host 'localhost (127.0.0.1)' can't be established. ECDSA key fingerprint is 99:4c:e7:56:8e:ec:81:67:87:95:38:26:35:01:a1:e4. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts. kamaraj@localhost's password: |
Now provide the password for your user account. And it will get into the system (in this case its localhost)
4) How to set password less connectivity ?
5) create public key and private key for the host by using the below command.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 | #Goto the home directory and execute the below ssh-keygen command $ cd $ ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/home/kamaraj/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identificat ion has been saved in /home/kamaraj/.ssh/id_rsa. Your public key has been saved in /home/kamaraj/.ssh/id_rsa.pub. The key fingerprint is: 16:fc:a9:bc:d9:fe:f1:12:0f:05:88:04:b4:8c:5b:97 kamaraj@Kamaraj The key's randomart image is: +--[ RSA 2048]----+ | .oo.. . | | o o... . | | . + E . | | o . o . . | | . S o . | | o . o | | o .+ | | + .o. | | o.o.... | +-----------------+ |
6) Now you can see a .ssh folder is created in your home directory and you can see some files inside the .ssh folder.
Note : .ssh is hidden folder
1 2 3 4 5 | kamaraj@Kamaraj:~/.ssh$ ls -lrt total 16 -rw-r--r-- 1 kamaraj kamaraj 1106 Nov 10 23:26 known_hosts -rw-r--r-- 1 kamaraj kamaraj 397 Nov 10 23:28 id_rsa.pub -rw------- 1 kamaraj kamaraj 1675 Nov 10 23:28 id_rsa |
1 2 | ~/.ssh/id_rsa : private or identification key ~/.ssh/id_rsa.pub : public key |
7) create a new file called authorized_keys2 in .ssh folder and copy the contents of id_rsa.pub.
1 | cat id_rsa.pub >> authorized_keys2 |
8) That’s all. Now try the ssh command.
1 2 3 4 5 6 7 | $ ssh localhost Welcome to Ubuntu 11.04 (GNU/Linux 2.6.38-12-generic i686) * Documentation: https://help.ubuntu.com/ Last login: Thu Nov 10 23:48:00 2011 from localhost $ |
This time ssh command didn’t ask the password.
If you want to connect to some other machine, then scp the id_rsa.pub file to the destination machine and put it under the .ssh folder in the name of authorized_keys2.
Recent Comments