ssh链接：

  ssh root@192.168.1.250

  ssh -p 22222 root@101.201.43.143

输入密码登陆

ssh不用收入密码建立密钥

1、生成秘钥

[root@localhost logs]# ssh-keygen

Generating public/private rsa key pair.Enter file in which to save the key (/root/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /root/.ssh/id_rsa.Your public key has been saved in /root/.ssh/id_rsa.pub.The key fingerprint is:6b:45:21:25:cf:b2:0d:ac:cd:28:d6:1a:a2:32:82:41 root@localhost.localdomainThe key's randomart image is:+--[ RSA 2048]----+|        o.o      ||       . = .     || E      + +      ||.    . = *       ||. . + + S o      ||.o o +   o       ||*   .   o        ||o.     .         ||                 |+-----------------+2、22号端口把秘钥发过去

[root@localhost logs]# ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.1.250 

root@192.168.1.250's password:

3、非22号端口把秘钥发过去

[root@localhost logs]# ssh-copy-id -i ~/.ssh/id_rsa.pub '-p 22 root@11.11.11.11'

root@101.201.43.143's password:

4.ubuntu服务器

#ssh-copy-id root@11.11.11.1 -p 22

下次链接不用收入密码了！

有两个节点node1 node2，也可以是ip地址

1.在node1上生成公钥/私钥对

[hjf@node1 ~]$ ssh-keygen -t rsa12

敲3次回车在/home/hjf 目录下生成.ssh目录，里面有id_rsa，id_rsa.pub

2.把node1下的id_rsa.pub复制到node2下的.ssh/authorized_keys

[hjf@node1 ~]$ scp .ssh/id_rsa.pub hjf@node4:/home/hjf/id_rsa.pub          hjf@node2's password:id_rsa.pub                          100%  391     0.4KB/s   00:00                                                                                                                                                 1234

第一次连接会输入一个密码，这里用scp复制

3.将node2中的id_rsa.pub追加到.ssh/authorized_keys里，并改变authorized_keys的权限600

[hjf@node2 ~]$ cat id_rsa.pub >>.ssh/authorized_keys[hjf@node2 ~]$ chmod 600 .ssh/authorized_keys123

4.node1 登陆node2

ssh hjf@node2