RSA Authentication login configuration for LINUX-SSH

First look at the experimental environment:

[[email protected]localhost  ~] # cat/proc/version  #ip 192.168.254.130  Linux version 2.6.32-431.el6.x86_64 ([ Email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (gcc)) #1 SMP Fri Nov 03:15:09 UTC 2013[[email&nb Sp;protected]wulaoer  ~]# cat/proc/version  #ip 192.168.254.131  Linux version 2.6.32-431.el6.x86_64 ([email protected]) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC)) #1 SMP Fri Nov 03:15:09 UTC 2013[email protected] ~$ sudo cat/proc/version  #192.168.254.129  [sudo] Wlof Password: Linux version 4.2.0-16-generic ([email protected]) (gcc version 5.2.1 20151003 (Ubuntu 5.2.1-21ubuntu2)) # 19-ubuntu SMP Thu Oct 8 15:35:06 UTC 

Two CentOS and one Ubuntu, two centos versions of the same, in order to distinguish me from each user in red to distinguish. If you are a newly installed system then you need to install Ssh,centos direct yum-y install SSH If it is Ubuntu, use sudo apt-get install openssh-server very simple, a command to execute on it.

First: Key generation

[Email protected] ~]# ssh-keygen-t rsagenerating public/private RSA key pair. Enter file in which to save the key (/ROOT/.SSH/ID_RSA): Created directory '/root/.ssh '. Enter passphrase (empty for no passphrase): Enter same passphrase Again:your identification have been saved in/root/.ssh/ Id_rsa.  #私钥文件Your public key has been saved in/root/.ssh/id_rsa.pub.  #公钥文件The key fingerprint is:8e:5f:78:ca:fc:79:cc:e0:c7:18:2a:31:2f:0a:8d:40 [email protected]the key ' s randomart image is:+--[RSA 2048]----+|                 | |                 | | E               | |.                | |       S        | |. o  oo. o      | |  O. . +ooob     | |   .  o+o+o.*    | |    .. o=.oo     |+-----------------+[[email protected] ~]# cd/root/.ssh/# If it is Ubuntu, it is under the name of the user under the home directory. SSH directory. [email protected]. ssh]# Lsid_rsa  id_rsa.pub

Second: You can modify the public key file name directly locally or in the process of transmission modification, this according to their own habits.

[email protected]. ssh]# ll total dosage 12-rw-------. 1 root root 1675 May  23:10 id_rsa-rw-r--r--. 1 root root  394 May  23:10 id_rsa.pub-rw-r--r--. 1 root root
   397 May  20:13 known_hosts[[email protected]. ssh]# mv id_rsa.pub Authorized_keys   #或者 [[email protected]. SSH ]# scp-r authorized_keys 192.168.254.130:/root/.ssh/[email protected] ' s Password:authorized_keys 100% 394 0.4KB/s 00:00

Third: Test direct login to see if you need to use a password.

[email protected]. ssh]# ssh 192.168.254.130Last Login:fri 00:28:12 from 192.168.254.131[[email protected]
   
    localhost
   

Note here that the hostname has been sent a change indicating that the login was successful.

A machine name Wulaoe and an ubuntu password-free login localhost,wulaoer has been set up, the following is set Ubuntu.

[Email protected]:~$ cd/home/wlof/.ssh/  #这里的wolf是我的用户名下的家目录 [email protected]:~/.ssh$ lsknown_hosts[email protected]:~/.ssh$ ssh-keygen-t RSA #如果这里要是加sudo的话认证的用户就是root了, to see the path of the authentication file generating public/private RSA key pair. Enter file in which to save the key (/HOME/WLOF/.SSH/ID_RSA): Enter passphrase (empty for no passphrase): Enter same PASSP Hrase again:your identification has been saved In/home/wlof/.ssh/id_rsa.   #私钥文件路径Your public key has been saved in/home/wlof/.ssh/id_rsa.pub. #公钥文件路径The key fingerprint is:sha256:fe+ob2mq4gfwwa4misx8bsttprbtczthwgkoua/g78a [email protected]the key ' s Randomart Image is:+---[RSA 2048]----+|. o*bx++. . ||. O.b+x O + | | .+ =.* = || =.. E o *. . || o+ o= S O. || O. . = O | | . . . || . || |+----[SHA256]-----+[email protected]:~/.ssh$ lsid_rsa id_rsa.pub known_hosts

SSH Verification Test

[Email protected]:~/.ssh$ scp-r id_rsa.pub [email protected]:/root/.ssh/authorized_keys  #在这里要注意必须要在连接的IP前加 [ Email protected], or the system will default to use the current user name, here has to add in the way added [email protected] ' s password:id_rsa.pub                            100%  407     0.4kb/ s   00:00    [email protected]:~/.ssh$ ssh 192.168.254.130[email protected] ' s password: [email protected]:~/.ssh$ SSH [email protected]last login:fri 00:28:44 from 192.168.254.131[[email protected] ~]#     #主机名已经切换过来, indicating successful login

One login multiple settings

　　

　　

　　

RSA Authentication login configuration for LINUX-SSH