ssh免密密钥

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[root@103 ~]# useradd kai
[root@103 ~]# passwd kai
[root@104 ~]# useradd kai
[root@104 ~]# passwd kai

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[kai@103 root]$ ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/home/kai/.ssh/id_dsa): 	存储位置
Created directory '/home/kai/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /home/kai/.ssh/id_dsa.	私钥
Your public key has been saved in /home/kai/.ssh/id_dsa.pub.	公钥
The key fingerprint is:
SHA256:/V4sNcir8bA3Rqd3L+QFRjiNlA3X46Y96LspJm6oxUI kai@103
The key's randomart image is:
+---[DSA 1024]----+
|           .oB.. |
|            =.+..|
|             o. .|
|         . . .oo |
|     E  S . o.B. |
|    . .    ..*o+.|
|     . o. o.==o..|
|      o. o X=+= .|
|     .. o.=o+*ooo|
+----[SHA256]-----+
[kai@103 root]$ ll /home/kai/.ssh/
总用量 8
-rw------- 1 kai kai 668 4月  18 15:31 id_dsa
-rw-r--r-- 1 kai kai 597 4月  18 15:31 id_dsa.pub

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[kai@103 root]$ ssh-copy-id -i /home/kai/.ssh/id_dsa.pub kai@192.168.1.104
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/home/kai/.ssh/id_dsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
kai@192.168.1.104's password: 
Number of key(s) added: 1
Now try logging into the machine, with:   "ssh 'kai@192.168.1.104'"
and check to make sure that only the key(s) you wanted were added.