集群环境SSH免密码登录设置

#127.0.0.1  localhost localhost.localdomain localhost4 localhost4.localdomain4

#::
1        localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.1.160 Hadoop01

192.168.1.161 hadoop02

192.168.1.162 hadoop03

192.168.1.163 hadoop04

192.168.1.164 hadoop05

2) 输入命令:cd .ssh进入rsa公钥私钥文件存放的目录,删除目录下的id_rsa,id_rsa.pub文件。

二、在每台机上产生新的rsa公钥私钥文件,并统一拷贝到一个authorized_keys文件中

1) 登录hadoop01,在.ssh目录下输入命令:

ssh-keygen -t rsa

,三次回车后,该目录下将会产生id_rsa,id_rsa.pub文件。其他主机也使用该方式产生密钥文件。

2) 登录hadoop01,输入命令:

cat id_rsa.pub >> authorized_keys

,将id_rsa.pub公钥内容拷贝到authorized_keys文件中。

3) 登录其他主机,将其他主机的公钥文件内容都拷贝到hadoop01主机上的authorized_keys文件中,命令如下:

ssh-copy-id -i hadoop01 #登录hadoop02,将公钥拷贝到hadoop01的authorized_keys中

ssh-copy-id -i hadoop01#登录hadoop03,将公钥拷贝到hadoop01的authorized_keys中

ssh-copy-id -i hadoop01#登录hadoop04,将公钥拷贝到hadoop01的authorized_keys中

ssh-copy-id -i hadoop01 #登录hadoop05,将公钥拷贝到hadoop01的authorized_keys中,最终authorized_keys文件内容如下:

[root@hadoop01 .ssh]# more authorized_keys

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAp7jp4a1/deK4B/eZW8kdiCQvzpKe4Id0uP0DdONFW85r

20rpH4ZpNSB7JNYFiqjMUPQ
/2EWLXh7xoa9UntKsMVVcZr3BTiXRZ0Gx7IDacwz8Cq0qYrwUCMTKt7QF

xK5RwXyuZqDFjc2yC3
/ZoqeyeLERFTll3ZLGeFsXhJjlkPTvtnvx0zX6lacPZL4VguoM5YHw3KaJg8bd

qehJzbQoPS8sm00ES4iygbR
+Ixz1cnGTrtNU1S3lh4/y0PC6spMs9Z2Mf097FTLQJXJDiGqU9Tq3MHvl

srZFx92H4yeiJuYWJaZImuiq
/feRIo30Dig6obEfuAn13vevdXozcXNlYQ== root@hadoop03

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAwpEgmBzfGw1mrKy3Ho8k/h4jrZlRdIzuLs6PKqDPV/Cw

2kjSYXV7tyGklUYWPWr1Dt6kw5
+Ojr7zv+cFnFWKzTTAJz3V4md0RyQ11Kb+IJA7b88SRHcVLlNF2GDX

N2pVqh9lf6Zu6zfpnAjCg
/mU8qzTrZfFZdzPtBppimMq+l0bolvgnxEEkpFTNkpHB8+cD732WL+KiW52

7nt0LGBbVbZz9mUa
+0bsPGK7ySfk1SPUkGyNXXqVjEydyjvRY8bob7Q3mFX3MpDT696R8n7U7hQ7u4b8

gbe3rIuQcWwGseEQrGjIDhLb9am3dbgDuFeg73RJqFZMOp2y6zQF3jQIew
== root@hadoop02

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAmc2M6Bzw1cPaDwjbtgynJPWRKv9pDnHjBSn5BDbIX0po

8GHHGr1pvYMGu4XWlIa76O44
+bmF32K/9ECzBcNVL6a+aN5HWdUPpE6zagFUcaewXu2p4+FCZWpoTZbj

zHKGeay35Id
+mpltZUWZlR5lOX+G/veNzuZNpKXnVYoZdAaJ3XlH6IVhKlGOuZkXxvD7e+YD4oxZw+4o

iaav
/QtAhZHXWcAt2eVj9xw+j/3Ip5ImmIWHv5/AOFrgiY6c6U+2g5xOGONINbh9CxQ1L4HbQVAx8hYC

stWUm0LfFAcMwXDwb8RAFj
+cH+D/xG6CrORLb4UfroJHa6N64rx/5dmz7w== root@hadoop04

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAxAsHr8Jp4vXI7bPGmSsO/+bT43GsxQ4GKdGf8qLPsFY+

/KluWl0TrRLwBVHGc94gpN2JOqtvKYYDSHw4Fj6KPSk/6Nt8CutZAwASoVxzexTFMOSwNFpTMsLc7Oza

Q3XG6v6PgtBEJqdUdl4zIFAZnkZjKmZp8SWG1jGo
/vl3jsbrnmFQFeH04MdVcm9r1wvl80bdF9YvYEtg

ymHO4
/tANKWSNKGw2EcthNWyQiN4hIYOoBQaUA3FlAXyqcD2+Q+2frf0gNF5KfKKLXmmlAuS9Oi6JqFJ

f1BLmMquI4n02owzU0zlkj3Px5IcCfQbDQ
/JedHcjxEKP2S+9m3yxG4h2Q== root@hadoop05

ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAyS1PbXTgFqHcGV/k0QUZni5xB5+q71qx4r5xto+WLkVQ

MiS3gR
/VYZoyDLrQRVf5t0JiliCgHeU0MG/ASd1LPbsVYCX5V9cmcm1hMByDKJ6FwIxz5cY4y1dBpwAZ

2E24CQWfZuevaeIFnL80RGGLhRgCxbLb3aPvRZuV34utD
+5kgAFJwYCQYN4KnFG1S5e4X6U5J3FsCDby

GD7dhtWWktMV2SAnWjrmULguaVRqO0sDIEiVSc9
+KKqAmlOab+5SbZAI5+3hzJog5c3i4f5fHXWnxYqy

LNo3yYSWraV5KcYIlNPqX6iJKvjLWbNDwD3
+70u4nWjBSXXufhff71LdHw== root@hadoop01

三、授权authorized_keys文件

1) 登录hadoop01,在.ssh目录下输入命令:

chmod 600 authorized_keys

,效果如下:

[root@hadoop01 .ssh]# ls -al

total
28

drwx
------.  2 root root 4096 Oct 24 12:27 .

dr
-xr-x---. 22 root root 4096 Oct 24 19:20 ..

-rw-------.  1 root root 1975 Oct 24 12:27 authorized_keys

-rw-------.  1 root root 1975 Oct 24 12:09 authorized_keys_20141024

-rw-------.  1 root root 1675 Oct 24 12:23 id_rsa

-rw-r--r--.  1 root root  395 Oct 24 12:23 id_rsa.pub

-rw-r--r--.  1 root root 2020 Oct 24 12:10 known_hosts

四、将授权文件分配到其他主机上

1) 登录hadoop01,将授权文件拷贝到hadoop02、hadoop03...,命令如下:

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