Linux remote login and password-free login

Recently learned something about Linux, one of which is about SSH (Linux remote login)

Here's a summary:

First, about SSH installation

Suppose we need to log on to host bit B, terminal input on Host B: SSH localhost

If it appears:

This means that SSH is not installed, so you need to install SSH

Enter sudo apt-get install openssh-server for installation

PS: If the installation fails here, it may be that one of your dependencies is incorrect, just reinstall it by its name.

Installation is successful!

Landing is very simple.

Then we enter the host a in our remote operation:

SSH [user name]@[b host password]

Again, password-free login

Terminal input in Host A: Ssh-keygen

followed by the default carriage return (enter y when Y is required)

This time into your. SSH directory and found a file called Id_rsa.pub

In terminal input: Ssh-copy-id-i id_rsa.pub [target host user name]@[Host B's IP]

You can do it.

In addition, if you enter into the. SSH document in your operating host B, you will find a name called Authorized_keys

This is your login key! @￥##%# Although I do not know what, in a word you want to delete this, you can not go up qaq

Linux remote login and password-free login