Linux集群規(guī)模20臺，需相互間免密登陸。

      先選擇一臺主機(jī)保存所有主機(jī)的密鑰，然后將密鑰復(fù)制到所有主機(jī)。

1.登陸每臺主機(jī)創(chuàng)建ssh.pub：

[root@master-1 ~]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
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:Z0rzrrX1DA+Yjw6S9iFnoGQfQc9NVn1PXEXHohC/gno root@jumpserver
The key's randomart image is:
+---[RSA 3072]----+
|      .   +o.. +B|
|     . o +..  o *|
|      . o .... +.|
|       . .  ..  .|
|    o o S + .    |
|   o o * * +     |
|    . B E = +    |
|     . B = = *   |
|        oo= . +  |
+----[SHA256]-----+
 

2. 每臺主機(jī)執(zhí)行ssh-copy-id root@master-1復(fù)制到Master-1

3.登陸Master-1將密碼復(fù)制到所有主機(jī)：

scp .ssh/authorized_keys root@master-2:/root/ssh.txt

scp .ssh/authorized_keys root@master-3:/root/ssh.txt

scp .ssh/authorized_keys root@node-1:/root/ssh.txt

....

4.登陸每臺主機(jī)，將ssh.txt追加到.ssh/authorized_keys即可。

cat /root/ssh.txt >> /root/.ssh/authorized_keys