1）操作系统版本
CentOS Linux release 7.2.1511 (Core)
2）机器说明
|
IP地址 |
机器名（hostname） |
|
172.24.5.173 |
bgs-5p173-wangwenting |
|
172.24.5.174 |
bgs-5p174-wangwenting |
|
172.24.5.175 |
bgs-5p175-wangwenting |
在集群模式下，本文默认 172.24.5.173 为集群中的 master, 172.24.5.174 和 172.24.5.175 为集群中的 slave。
3）同步时间
在三个机器上分别运行 data 命令同步时间，精确到秒
xx:xx:xx 表示当前你要设置的时间格式和具体时间。[root@bgs-5p173-wangwenting ~]# data -s xx:xx:xx |
4）建立账号
在三个机器上都建立hadoop账户，密码和账号一样
[root@bgs-5p173-wangwenting ~]# useradd -d /opt/hadoop hadoop[root@bgs-5p173-wangwenting ~]# passwd hadoop |
给 hadoop 用户分别加上 sudo 权限
# vim /etc/sudoers
root ALL=(ALL) ALLhadoop ALL=(ALL) ALL |
5）建立账户后，需要对 hadoop 账户实现无密码 ssh 登陆的功能 。
[root@bgs-5p173-wangwenting ~]$ su hadoop生成密钥,一直按enter键：[hadoop@bgs-5p173-wangwenting ~]$ ssh-keygen -t rsa将秘钥发送到其他机器上：[hadoop@bgs-5p173-wangwenting ~]$ ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@bgs-5p173-wangwenting[hadoop@bgs-5p173-wangwenting ~]$ ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@bgs-5p174-wangwenting[hadoop@bgs-5p173-wangwenting ~]$ ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@bgs-5p175-wangwenting验证是否免秘钥登录成功：[hadoop@bgs-5p173-wangwenting ~]$ ssh 172.24.5.173[hadoop@bgs-5p173-wangwenting ~]$ ssh 172.24.5.174[hadoop@bgs-5p173-wangwenting ~]$ ssh 172.24.5.175如果能登录且不用输密码，则172.24.5.173可以免密码登录另外两台机器。 同理要想172.24.5.174可以免密码登录另外两台机器需要执行以下操作：[hadoop@bgs-5p174-wangwenting ~]$ ssh-keygen -t rsa将秘钥发送到其他机器上：[hadoop@bgs-5p174-wangwenting ~]$ ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@bgs-5p173-wangwenting[hadoop@bgs-5p174-wangwenting ~]$ ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@bgs-5p174-wangwenting[hadoop@bgs-5p174-wangwenting ~]$ ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@bgs-5p175-wangwenting验证是否免秘钥登录成功：[hadoop@bgs-5p174-wangwenting ~]$ ssh 172.24.5.173[hadoop@bgs-5p174-wangwenting ~]$ ssh 172.24.5.174[hadoop@bgs-5p174-wangwenting ~]$ ssh 172.24.5.175如果能登录且不用输密码，则172.24.5.174可以免密码登录另外两台机器。 同理要想172.24.5.175可以免密码登录另外两台机器需要执行以下操作：[hadoop@bgs-5p175-wangwenting ~]$ ssh-keygen -t rsa将秘钥发送到其他机器上：[hadoop@bgs-5p175-wangwenting ~]$ ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@bgs-5p173-wangwenting[hadoop@bgs-5p175-wangwenting ~]$ ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@bgs-5p174-wangwenting[hadoop@bgs-5p175-wangwenting ~]$ ssh-copy-id -i ~/.ssh/id_rsa.pub hadoop@bgs-5p175-wangwenting验证是否免秘钥登录成功：[hadoop@bgs-5p175-wangwenting ~]$ ssh 172.24.5.173[hadoop@bgs-5p175-wangwenting ~]$ ssh 172.24.5.174[hadoop@bgs-5p175-wangwenting ~]$ ssh 172.24.5.175如果能登录且不用输密码，则172.24.5.175可以免密码登录另外两台机器。 最终：三台机器之间可以免密码互相登录。 |