一， 操作步骤
客户端进入一个用户hadoop 开启另一台机器，创一个用户hadoop 用于测试
（红字为输入代码）
[hadoop@localhost ~]$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/hadoop/.ssh/id_rsa):
Created directory '/home/hadoop/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/hadoop/.ssh/id_rsa.
Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:u2aFFAWxwYXKuuY7qjsdp2Cm0bLV2GfMaTABT/N64Ys hadoop@localhost.localdomain
The key's randomart image is:
+---[RSA 2048]----+
| ..o .+*o |
| o.o +o |
| .oo... |
| ooo.. |
| . +.*ooS. |
|+o= =oB.... |
|+B +E=. .. |
|+ o + o. |
|o+.+oo o. |
+----[SHA256]-----+
[hadoop@localhost ~]$ ls .ssh/
id_rsa id_rsa.pub
[hadoop@localhost ~]$ ssh-copy-id -i /home/hadoop/.
./ .bash_logout .cache/ .ssh/
../ .bash_profile .config/ .viminfo
.bash_history .bashrc .mozilla/
[hadoop@localhost ~]$ ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub hadoop@192.168.100.68
/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/hadoop/.ssh/id_rsa.pub"
The authenticity of host '192.168.100.68 (192.168.100.68)' can't be established.
ECDSA key fingerprint is SHA256:ic5T7l1Mcl2LKGLqF7aN/bAO0Jesw2biXeFOUbZBaoQ.
ECDSA key fingerprint is MD5:6d:23:55:7a:e8:8d:0e:04:3d:8c:89:bf:b9:ab:a7:6a.
Are you sure you want to continue connecting (yes/no)? yes
/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
hadoop@192.168.100.68's password:
Generating public/private rsa key pair.
Enter file in which to save the key (/home/hadoop/.ssh/id_rsa):
Created directory '/home/hadoop/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/hadoop/.ssh/id_rsa.
Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:u2aFFAWxwYXKuuY7qjsdp2Cm0bLV2GfMaTABT/N64Ys hadoop@localhost.localdomain
The key's randomart image is:
+---[RSA 2048]----+
| ..o .+*o |
| o.o +o |
| .oo... |
| ooo.. |
| . +.*ooS. |
|+o= =oB.... |
|+B +E=. .. |
|+ o + o. |
|o+.+oo o. |
+----[SHA256]-----+
[hadoop@localhost ~]$ ls .ssh/
id_rsa id_rsa.pub
[hadoop@localhost ~]$ ssh-copy-id -i /home/hadoop/.
./ .bash_logout .cache/ .ssh/
../ .bash_profile .config/ .viminfo
.bash_history .bashrc .mozilla/
[hadoop@localhost ~]$ ssh-copy-id -i /home/hadoop/.ssh/id_rsa.pub hadoop@192.168.100.68
/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/hadoop/.ssh/id_rsa.pub"
The authenticity of host '192.168.100.68 (192.168.100.68)' can't be established.
ECDSA key fingerprint is SHA256:ic5T7l1Mcl2LKGLqF7aN/bAO0Jesw2biXeFOUbZBaoQ.
ECDSA key fingerprint is MD5:6d:23:55:7a:e8:8d:0e:04:3d:8c:89:bf:b9:ab:a7:6a.
Are you sure you want to continue connecting (yes/no)? yes
/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
hadoop@192.168.100.68's password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh 'hadoop@192.168.100.68'"
and check to make sure that only the key(s) you wanted were added.
and check to make sure that only the key(s) you wanted were added.
测试：
[hadoop@localhost ~]$ ssh hadoop@192.168.100.68
Last login: Fri Aug 16 09:40:03 2019
[hadoop@localhost ~]$
Last login: Fri Aug 16 09:40:03 2019
[hadoop@localhost ~]$