（五）hadoop系列之__集群搭建SSH无密访问多台机器

水深无声 2021-12-22 10:13 125阅读 0赞

![ContractedBlock.gif][] ![ExpandedBlockStart.gif][]

免密码ssh设置
    现在确认能否不输入口令就用ssh登录localhost: $ ssh localhost
    如果不输入口令就无法用ssh登陆localhost，执行下面的命令：
    
    1. 并修改hosts映射:
      
      添加：(配置三台机器hosts,保证可以互相访问)
      $ vi /etc/hosts
        127.0.0.1       localhost.localdomain   localhost
        192.168.126.10  master.localdomain master
        192.168.126.20  slave1.localdomain slave1
        192.168.126.30  slave2.localdomain slave2
    2. 生成三台机器的密钥和公钥 
        $  ssh-keygen  -t rsa -f ~/.ssh/id_rsa #生成秘钥和公钥
        $ cat ~.ssh/id_rsa.pub >> ~/.ssh/authorized_keys //把当前主机的公钥添加到authorized_keys文件
    
        $ scp .ssh/id_rsa.pub root@192.168.126.10:/home/hadoop/.ssh/authorized_keys_slave1 //复制slave1公钥添加到authorized_keys_slave1文件
        $ scp .ssh/id_rsa.pub root@192.168.126.10:/home/hadoop/.ssh/authorized_keys_slave2 //复制slave2公钥添加到authorized_keys_slave2文件
    
    
    3.把slave1和slave2的公钥追加到authorized_keys
        $ cat /home/hadoop/.ssh/authorized_keys_slave1 >> /home/hadoop/.ssh/authorized_keys
        $ cat /home/hadoop/.ssh/authorized_keys_slave2 >> /home/hadoop/.ssh/authorized_keys
         master配置
         ################master#################
        $ cat id_rsa.pub >> authorized_keys
        $ cat authorized_keys_slave1 >> authorized_keys
        $ cat authorized_keys_slave2 >> authorized_keys
        $ chmod 644 authorized_keys//修改权限 
         ######################################                        
                            
    4.把主机的公共密钥复制到slave1和slvae2
        $ scp id_rsa.pub root@192.168.126.20:/home/hadoop/.ssh/authorized_keys_master
        $ scp id_rsa.pub root@192.168.126.30:/home/hadoop/.ssh/authorized_keys_master
        slave1配置
        ##################slave1#####################
        cat id_rsa.pub >> authorized_keys
        cat authorized_keys_master >> authorized_keys
        chmod 644 authorized_keys
        ######################################    
        slave2配置
        ##################slave2#####################
        cat id_rsa.pub >> authorized_keys
        cat authorized_keys_master >> authorized_keys
        chmod 644 authorized_keys
      #######################################

最后测试：

master主机访问slave1和slave2:

ssh 192.168.126.20 //回车，如果切换到slave1,则访问成功。slave3同理。

转载于:https://www.cnblogs.com/FCWORLD/p/3188172.html

[ContractedBlock.gif]: https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif
[ExpandedBlockStart.gif]: /images/20211220/4c55ec68a18c4f6fb2bf26ad7dd72d44.png