配置多台机器SSH相互通信信任

2台机器分别执行ssh-keygen生成公钥和密钥

    [root@hadoop-01 ~]# ssh-keygen
    生成.ssh文件夹及id_rsa和id_rsa.pub
    [root@hadoop-01 .ssh]# ll
    total 16
    -rw-------. 1 root root 1675 Dec 13 21:37 id_rsa
    -rw-r--r--. 1 root root  396 Dec 13 21:37 id_rsa.pub

选取第一台,生成authorized_keys文件

    [root@hadoop-01 ~]# cd .ssh
    [root@hadoop-01 .ssh]# cat ./id_rsa.pub >> ./authorized_keys

将另一台id_rsa.pub内容,手动copy到第一台的authorized_keys文件

    [root@hadoop-02 .ssh]# more id_rsa.pub
    拷贝至`authorized_keys`文件(注意copy时,最好先放到记事本中,将回车去掉,成为一行)

设置每台机器的权限

    [root@hadoop-01 ~]# chmod 700 -R ~/.ssh
    [root@hadoop-01 ~]# chmod 600 ~/.ssh/authorized_keys 

将第一台的authorized_keys scp 给hadoop-02(第一次传输,需要输入密码)

    [root@hadoop-01 ~]#  scp authorized_keys root@hadoop-02:/root/.ssh

配置/etc/hosts(两台机器都要配置)

    [root@hadoop-01 ~]# vi /etc/hosts
    将两台机器的IP和机器名都写入
    127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
    ::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
    192.168.137.130 hadoop-01
    192.168.137.131 hadoop-02

验证(每台机器上执行下面的命令,只输入yes,不输入密码,则这两台互相通信了)

    [root@hadoop-01 ~]# ssh root@hadoop-02 date
    [root@hadoop-02 ~]# ssh root@hadoop-01 date