RedHat hadoop ssh配置安装

1、Hadoop集群各节点配置

192.168.232.142 master

192.168.232.144 node2

192.168.232.146 secondarynamenode

192.168.232.148 node1

2、在master节点生成登录密钥

#添加hadoop用户

[root@master1 opt]# groupadd hadoop
[root@master1 opt]# useradd hadoop -g hadoop

#切换Hadoop 用户下

su hadoop

cd /home/hadoop/

#生成公钥和私钥

ssh-keygen -q -t rsa -N "" -f /home/hadoop/.ssh/id_rsa

或

ssh-keygen -t rsa

cd /home/hadoop/.ssh

cat id_rsa.pub > authorized_keys

chmod go-wx  authorized_keys

chmod 700 /home/hadoop/.ssh/

注意：一般配置完后没法登录的缘由是由于.ssh文件夹和里边相关文件权限不正确的缘由。

要注意权限问题。

3、将master的authorized_keys 复制到  node1:/home/hadoop/.ssh/authorized_keys

[hadoop@master  ~]$ hostname

Master

[hadoop@master  ~]$ ifconfig

eth0      Link encap:Ethernet  HWaddr 00:0C:29:0E:6F:B6 

          inet addr:192.168.232.142  Bcast:192.168.232.255  Mask:255.255.255.0

          inet6 addr: fe80::20c:29ff:fe0e:6fb6/64 Scope:Link

          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:1025 errors:0 dropped:0 overruns:0 frame:0

          TX packets:699 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:165818 (161.9 KiB)  TX bytes:99175 (96.8 KiB)

[hadoop@master  ~]$ scp /home/hadoop/.ssh/authorized_keys hadoop@192.168.232.142:/home/hadoop/.ssh/（用户名@IP：存储地址）

authorized_keys                               100%  395     0.4KB/s   00:00 

注意：

在配置时，出现以下错误：

[hadoop@master ~]$ scp /home/hadoop/.ssh/authorized_keys hadoop@192.168.57.135:/home/hadoop/.ssh
ssh: connect to host 192.168.57.135 port 22: Connection refused
lost connection

缘由：sshd服务没有启动，先启动sshd服务后就没问题了。

1）、查看服务是否启用

ps -ef | grep ssh

2）、若是没有启用，则要安装

yum install openssh-server

3）、安装完以后开启

/etc/init.d/sshd start

4）、安装完以后开启

[root@master Desktop]# /etc/init.d/sshd start
Generating SSH1 RSA host key:                              [  OK  ]
Generating SSH2 RSA host key:                              [  OK  ]
Generating SSH2 DSA host key:                              [  OK  ]
Starting sshd:                                             [  OK  ]
[root@master Desktop]#

若是/etc/init.d/sshd start出现： 

Generating SSH1 RSA host key:                              [FAILED]

解决办法： 

$ yum search openssh 
$ sudo yum install openssh

若是已经安装openssh，启动sshd 

$ sudo /etc/init.d/sshd start 
sshd re-exec requires execution with an absolute path 
[honki@localhost ~]$ sudo service sshd start 
Generating SSH1 RSA host key:                              [  OK  ] 
Generating SSH2 RSA host key:                              [  OK  ] 
Generating SSH2 DSA host key:                              [  OK  ] 
Starting sshd:                                             [  OK  ]

4、修改authorized_keys权限

chmod go-wx .ssh/authorized_keys

5、切换到hadoop用户登陆

Ssh node1