Linux集群SSH免密登陸

? ? ? Linux集群規模20臺，需相互間免密登陸。

? ? ? 先選擇一臺主機保存所有主機的密鑰，然后將密鑰復制到所有主機。

1.登陸每臺主機創建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. 每臺主機執行ssh-copy-id root@master-1復制到Master-1

3.登陸Master-1將密碼復制到所有主機：

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，將ssh.txt追加到.ssh/authorized_keys即可。

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