ssh 无秘钥登录

三台centos 一台服务器192.168.2.152 一台客户端192.168.2.142 一台客户端192.168.2.151

（1）产生无密钥

[root@localhost ~]#  ssh-keygen -t dsa

Generating public/private dsa key pair.

Enter file in which to save the key (/root/.ssh/id_dsa):

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /root/.ssh/id_dsa.

Your public key has been saved in /root/.ssh/id_dsa.pub.

The key fingerprint is:

fa:65:a6:b8:6f:d1:f1:e0:40:2e:56:50:85:24:99:b5 root@localhost.localdomain

The key's randomart image is:

+--[ DSA 1024]----+

|      oB+o.      |

|      o.+.       |

|       +E        |

|      o o o      |

|     . .S+ +     |

|       .. o .    |

|      .  .+      |

|       o.=       |

|      o++        |

+-----------------+

注意这里要默认敲三下回车

（2）查看产生的密钥   会产生两个文件一个id_dsa是密钥 一个id_dsa.pub是公钥

[root@localhost ~]# ls -l .ssh/

总用量 12

-rw-------. 1 root root 616 3月  28 23:12 authorized_keys

-rw-------. 1 root root 672 3月  29 02:35 id_dsa

-rw-r--r--. 1 root root 616 3月  29 02:35 id_dsa.pub

（3）把公钥发给其他服务器 要输入yes 和对向服务器的密码   这里特别注意如果对方ssh端口不是22，是其他端口用""括起来加-p

例如ssh-copy-id -i .ssh/id_dsa.pub "-p21  root@192.168.2.142"

[root@localhost ~]# ssh-copy-id -i .ssh/id_dsa.pub root@192.168.2.142

The authenticity of host '192.168.2.142 (192.168.2.142)' can't be established.

RSA key fingerprint is 1c:f0:dd:01:d6:58:5e:e9:07:37:b4:cc:c4:91:59:de.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added '192.168.2.142' (RSA) to the list of known hosts.

root@192.168.2.142's password:

Now try logging into the machine, with "ssh 'root@192.168.2.142'", and check in:

.ssh/authorized_keys

to make sure we haven't added extra keys that you weren't expecting.

（4）无密钥登录

[root@localhost ~]# ssh -p22 root@192.168.2.142

Last login: Sun May  6 20:15:39 2018 from 192.168.2.149

[root@localhost ~]# ip a | grep 192.168

inet 192.168.2.142/24 brd 192.168.2.255 scope global dynamic ens33

inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0

（5）传文件给客户端服务器 142   scp -p22端口 -rp r是目录 p是不改变文件属性 bao目录名字 root用户@ip : /root 存放的路径

[root@localhost ~]#  scp -p22 -rp bao/ root@192.168.2.142:/root

apache-tomcat-9.0.5.tar.gz                         100% 9254KB   9.0MB/s   00:00

grafana-3.1.1-1470047149.x86_64.rpm                100%   39MB  38.7MB/s   00:01

sunlogin_remoteclient_2.2.0.39537Beta.tar.gz       100% 2849KB   2.8MB/s   00:00

zabbix-3.4.7.tar.gz                                100%   16MB  16.4MB/s   00:00

nginx-1.13.9.tar.gz                                100%  971KB 971.5KB/s   00:00

jdk-8u162-linux-x64.tar.gz                         100%  181MB  45.3MB/s   00:04

客户端查看

[root@localhost ~]# cd bao/

[root@localhost bao]# ls

apache-tomcat-9.0.5.tar.gz           nginx-1.13.9.tar.gz

grafana-3.1.1-1470047149.x86_64.rpm  sunlogin_remoteclient_2.2.0.39537Beta.tar.gz

jdk-8u162-linux-x64.tar.gz           zabbix-3.4.7.tar.gz

（6）写到脚本里

给192.168.2.151服务传入公钥

vi ssh.sh

第一种方法

scp -p22 -rp bao/ root@192.168.2.142:/root

scp -p22 -rp bao/ root@192.168.2.151:/root

第二种方法

for n in 142 151

do

scp -p22 -rp bao/ root@192.168.2.$n:/root

done

sh ssh.sh

[root@localhost ~]# sh ssh.sh

apache-tomcat-9.0.5.tar.gz                                                                         100% 9254KB   9.0MB/s   00:00

grafana-3.1.1-1470047149.x86_64.rpm                                                                100%   39MB  38.7MB/s   00:00

sunlogin_remoteclient_2.2.0.39537Beta.tar.gz                                                       100% 2849KB   2.8MB/s   00:00

zabbix-3.4.7.tar.gz                                                                                100%   16MB  16.4MB/s   00:00

nginx-1.13.9.tar.gz                                                                                100%  971KB 971.5KB/s   00:00

jdk-8u162-linux-x64.tar.gz                                                                         100%  181MB  90.5MB/s   00:02

apache-tomcat-9.0.5.tar.gz                                                                         100% 9254KB   9.0MB/s   00:00

grafana-3.1.1-1470047149.x86_64.rpm                                                                100%   39MB  38.7MB/s   00:01

sunlogin_remoteclient_2.2.0.39537Beta.tar.gz                                                       100% 2849KB   2.8MB/s   00:00

zabbix-3.4.7.tar.gz                                                                                100%   16MB  16.4MB/s   00:00

nginx-1.13.9.tar.gz                                                                                100%  971KB 971.5KB/s   00:00

jdk-8u162-linux-x64.tar.gz                                                                         100%  181MB  60.3MB/s   00:03