三台机器互相免密登录（详情版）

准备三台机器：

hadoop105、Hadoop06、hadoop107

1、三台机器执行以下命令

[root@hadoop105 ~]# ssh-keygen -t rsa
[root@hadoop106 ~]# ssh-keygen -t rsa
[root@hadoop107 ~]# ssh-keygen -t rsa

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2、进入/.ssh/目录 该目录存放密钥对

[root@hadoop105 ~]# cd ~/.ssh/

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3、新建authorized_keys并设置权限

[root@hadoop105 .ssh]# touch authorized_keys
[root@hadoop105 .ssh]# chmod 600 authorized_keys

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4、公钥追加 authorized_keys

[root@hadoop105 .ssh]# cat id_rsa.pub >> authorized_keys

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5、另外两台机器也执行如下操作

hadoop106

[root@hadoop106 ~]# cd ~/.ssh/
[root@hadoop106 .ssh]# touch authorized_keys
[root@hadoop106 .ssh]# chmod 600 authorized_keys 
[root@hadoop106 .ssh]# cat id_rsa.pub >> authorized_keys

hadoop107

[root@hadoop107 ~]# cd ~/.ssh/
[roothadoop107 .ssh]# touch authorized_keys
[root@hadoop107 .ssh]# chmod 600 authorized_keys 
[root@hadoop107 .ssh]# cat id_rsa.pub >> authorized_keys

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6、把hadoop106的公钥追加到hadoop105的authorized_keys

[root@hadoop106.ssh]# scp id_rsa.pub hadoop105:/home/
[root@hadoop105.ssh]# cat ../../home/id_rsa.pub >> ./authorized_keys/

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7、把hadoop105的公钥追加到Hadoop106的authorized_keys

[root@hadoop105 .ssh]# scp id_rsa.pub hadoop106:/home/
[root@hadoop106 .ssh]# cat ../../home/id_rsa.pub >> ./authorized_keys

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8、把hadoop105的公钥追加到hadoop107的authorized_keys

[root@hadoop105 .ssh]# scp id_rsa.pub hadoop107:/home/
[root@hadoop107 .ssh]# cat ../../home/id_rsa.pub >> ./authorized_keys

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9、把hadoop106的公钥追加到hadoop107的authorized_keys

[root@hadoop106 .ssh]# scp id_rsa.pub hadoop107:/home/
[root@hadoop107 .ssh]# cat ../../home/id_rsa.pub >> ./authorized_keys

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10、把hadoop107的公钥追加到hadoop105的authorized_keys

[root@hadoop107 .ssh]# scp id_rsa.pub hadoop105:/home/
[root@hadoop105 .ssh]# cat ../../home/id_rsa.pub >> ./authorized_keys

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11、hadoop107的公钥追加到hadoop106的authorized_keys

[root@hadoop107 .ssh]# scp id_rsa.pub hadoop105:/home/
[root@hadoop106 .ssh]# cat ../../home/id_rsa.pub >> ./authorized_keys

此时hadoop105、hadoop106、hadoop107互相免密