ons ready nec air 免密鑰登錄 inux pre emp only

操作步驟：
1.1 生成密鑰：
[root@linux-node1 ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Created directory ‘/root/.ssh‘.
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:
SHA256:lZUIBlcj3kfEX8VTQoNXlVuP2BTA5cvNeF/okv9NT5w root@linux-node1
The key‘s randomart image is:
+---[RSA 2048]----+
| ..=oo==*+X|
| + o.==.o=+|
| . + ..o=|
| . ...+B.|
| S = =|
| o o+|
| o .E=|
| o oo|
| ..+|
+----[SHA256]-----+
[root@linux-node1 ~]#
[root@linux-node1 ~]# cd /root/.ssh/
[root@linux-node1 .ssh]# ll
總用量 8
-rw-------. 1 root root 1675 6月 27 17:20 id_rsa
-rw-r--r--. 1 root root 398 6月 27 17:20 id_rsa.pub

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2.1 分發密鑰：
#ssh-copy-id ip 或 主機名

[root@linux-node1 .ssh]# ssh-copy-id [email protected]
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host ‘192.168.10.20 (192.168.10.20)‘ can‘t be established.
ECDSA key fingerprint is SHA256:3FvLpgF2SZ8tnDaLxx/6MOExLHQexXawRH0dAu/wgIk.
ECDSA key fingerprint is MD5:f2:3d:11:88:87:92:47:05:e2:93:ac:0a:a9:44:61:d9.
Are you sure you want to continue connecting (yes/no)? yes
/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
[email protected]‘s password:

Number of key(s) added: 1

Now try logging into the machine, with: "ssh ‘[email protected]‘"
and check to make sure that only the key(s) you wanted were added.

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驗證：

[root@linux-node1 ~]# ssh 192.168.10.20
Last failed login: Wed Jun 27 05:50:17 EDT 2018 from 192.168.10.10 on ssh:notty
There was 1 failed login attempt since the last successful login.
Last login: Wed Jun 27 04:19:23 2018 from 192.168.10.1
[root@linux-node2 ~]# ifocn
-bash: ifocn: 未找到命令
[root@linux-node2 ~]# ifconfig
ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.10.20 netmask 255.255.255.0 broadcast 192.168.10.255
inet6 fe80::e690:3c3c:62ba:c9e2 prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:b5:43:96 txqueuelen 1000 (Ethernet)
RX packets 530373 bytes 297203349 (283.4 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 730583 bytes 56873359 (54.2 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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Centos7.5 配置免密鑰登錄