Centos7 集群SSH无密码用户免密登录配置

例：配置集群1的A,B,C三台Centos7的test无密码用户免密登录

1，在A机器执行ssh-kengen生成秘钥，一路回车

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[root@lms lms]# su - test [test@test ~]# 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: SHA256:0jykURKZQMKvbEhlncm6Kef2ZH8mYwRUlYsdj1nzjZ0 root@lms The key's randomart image is: +---[RSA 2048]----+ | ...=.*=o..      | |  .+ *oo o o     | |  o.o . + B o + .| | . ... B = . o E | |.o .o + S        | |..++   o .       | | .+  o.          | |   oo .+ o       | |  . ....=        | +----[SHA256]-----+ [test@test ~]#

2，在该用户的家目录会生成一个.ssh目录，进入该目录，拷贝一份公钥（id_rsa.pub），并命名为 authorized_keys

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[test@test ~]# cd .ssh/ [test@test .ssh]# pwd /home/test/.ssh [test@test .ssh]# ll 总用量 12 -rw-------. 1 test root 1675 6月  29 17:01 id_rsa -rw-r--r--. 1 test root  390 6月  29 17:01 id_rsa.pub -rw-r--r--. 1 test root 1042 6月   6 10:08 known_hosts [test@test .ssh]# [test@test .ssh]# cp id_rsa.pub authorized_keys [test@test .ssh]#

3，在B，C机器的test用户下执行ssh-keygen

4，将 id_rsa，id_rsa.pub，authorized_keys拷贝至B，C机器的/home/test/.ssh下即可（使用root用户拷贝）

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1	[root@test .ssh]# scp authorized_keys id_rsa id_rsa.pub root@10.10.10.1:/home/test/.ssh/

5，测试，切换test用户：su - hdfs，执行ssh test@10.10.10.2

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[root@test ~]# su - test [test@test ~]# [test@test ~]# ssh test@10.10.10.1