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Ubuntu: How can I set up password-less SSH login?


Question: I want to be able to login to a remote via ssh without having to enter the
password all the time.
How do I set it up?
Is a different command required to execute a password-less session?

Solutions Sample (Please watch the whole video to see all solutions, in order of how many people found them helpful):

== This solution helped 18 people ==
I normally use sshpass for that, install it with sudo apt-get install sshpass
and use it like this
sshpass -p 'password' ssh your_username@your_server

== This solution helped 1 person ==
I'd like to add an answer for those who may find they should enter the password
even they have read all answers here because you have set IdentitiesOnly as
yes. And the answer here can save you much time to manage multiple keys, being
keys for git or server.
After I have generated the key and copied it to the server:
ssh-keygen # change the file to /home/yourname/.ssh/something
ssh-copy-id -i ~/.ssh/something.pub [email protected]
I found it didn't work.
Then I went to check the ~/.ssh/config file on the client, I saw this at the
bottom:
Host *
IdentitiesOnly yes
Then I add this above:
Host somename
HostName 192.168.20.160
User lerner
IdentityFile ~/.ssh/something
I can just log in by entering ssh somename.
Then you can add multiple ssh keys using your favorite names, and you only need
to add the settings like the above four lines to the config file.
Host is the name you'd like to enter when you connect the server later; the
HostName is the server's ip; User is the user name you log in the server; and
the identityfile is the file where you store the key you have generated.

== This solution helped 23 people ==
The way I usually do this is as follows:
ssh-keygen -t rsa
(When prompted for a password, leave it blank)
Then: cat ~/.ssh/id_rsa.pub | ssh username@hostname 'cat ＞＞ .ssh/
authorized_keys'
(This requires the folder .ssh to be in the home directory on the targeted
hostname, with the authorized_keys file in it)
Of course, replace username with the desired username, and hostname with the
desired hostname or IP address
After that, just SSH to that box just like you're used to.

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