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