之前已经有了namenode和datanode1,现在要新增节点datanode2
第一步：修改将要增加节点的主机名
hadoop@datanode1:~$ vim /etc/hostname
datanode2
第二步：修改host文件
hadoop@datanode1:~$ vim /etc/hosts
192.168.8.4 datanode2
127.0.0.1 localhost
127.0.1.1 ubuntu
192.168.8.2 namenode
192.168.8.3 datanode1
192.168.8.4 datanode2(增加了这个)
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
第三步：修改ip
![\]()
第四步：重启
第五步：ssh免密码配置
1.生成密钥
hadoop@datanode2:~$ ssh-keygen -t rsa -P ""
Generating public/private rsa key pair.
Enter file in which to save the key (/home/hadoop/.ssh/id_rsa):
/home/hadoop/.ssh/id_rsa already exists.
Overwrite (y/n)? y
Your identification has been saved in /home/hadoop/.ssh/id_rsa.
Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub.
The key fingerprint is:
34:45:84:85:6e:f3:9e:7a:c0:f1:a4:ef:bf:30:a6:74 hadoop@datanode2
The key's randomart image is:
+--[ RSA 2048]----+
| *= |
| o. |
| .o |
| .=.. |
| oSB |
| + o |
| .+E. |
| . +=o |
| o+..o. |
+-----------------+
2.把公钥传给namenode
hadoop@datanode2:~$ cd ~/.ssh
hadoop@datanode2:~/.ssh$ ls
authorized_keys id_rsa id_rsa.pub known_hosts
hadoop@datanode2:~/.ssh$ scp ./id_rsa.pub hadoop@namenode:/home/hadoop
hadoop@namenode's password:
id_rsa.pub 100% 398 0.4KB/s 00:00
3.把公钥追加到authorized_keys
hadoop@namenode:~/.ssh$ cat ../id_rsa.pub >> authorized_keys
hadoop@namenode:~/.ssh$ cat authorized_keys
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDuOOD8R7OfNSUhGPZhQWCfC0yTeM6+txWSo3LiJjEWZbH512ymKIEiNRjCzTiRjLEqWGadAPVbip3jLuOHFpk89v7D6q8QH4ilBjLtsaVxmhb77w3yGrXlHJ8+g3QtS8VmjGEyZ86oeM5F9UM8F8QmK9mxXOWhqt3xvufetr7o7acV3APEHH1hvvkFImim2sT/iNi/Nxsch176byUS6y86gOTgznVH8OIx8MDmdKSLjq
WPSCTrpvXPESlZvpLm4YSN2cYoKaxcedaynzOhXgAC0GLdq1k07eFmerUwpBT+xTzTRJPquYawK+MPf6+lnLm89u+bewdBZLdunCKhbCK3 hadoop@ubuntu3
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCssQnDzo5uhPn93bVqj+nEpzgQBipc1WgasOeFQV7ljyNlFHhOPVS6G3oHpvSrbjg3aK1MqxmCw0VokuuO5eoHwqh0alQw46eEmunzrnwuhhFpAU9V4t7LJ5pYuxZOioXbsJKxCetOY6G2lKRmyk2Z/MIMpPW+UFebt150+oYXcKKYSBBJoLmThH3bWW2CesAokIe8gCQ3rIYsHfA8rNuwxEnrL8fC2XlWODTahjHD5bymBO4rd3uiJxuTv7/r243t0hrimjhJ7uUIyPcIRYDchPmmO9DFVEBtYloLmqQQs/ZOxDiX7GF+YK7KC7Ayo1kL8VuwP90dqIhpaJmP96zV hadoop@ubuntu2
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDbeTMrOtMZ8gurJyzoSVFpJbtXzUYDElXJcfm0O+FRpigxoIePPHiQc5vi7kabnLSiEv+94YDMclxZpXFjR0TXz6IJOVdPxFPqovY+GzrYVXEXj3HhbBWKC4sFUvGFGSZr8rM3R5OE2wYIZzOKdX9c6Ak5uIE7BUSuXzaiFctYXIvu37TObYZ44vDQGv9/mPsqP4Qnyx4czTLD1VmOeUHA5iQTKLt4K0HNE3i+a3mEEBMxBwETUI/6dcmvTxjEe7cy48YPadr5UT0/xgTub/OdmkBfvfT6fPDVlHtRP5jQiFapFyzL/BXiObqkSlrJbLKWTczS8J6SfsKWsSZfOPzL hadoop@datanode2
4.把公钥传给其节点
hadoop@namenode:~$ scp ./.ssh/authorized_keys hadoop@datanode1:/home/hadoop/.ssh/authorized_keys
authorized_keys 100% 1190 1.2KB/s 00:00
hadoop@namenode:~$ scp ./.ssh/authorized_keys hadoop@datanode2:/home/hadoop/.ssh/authorized_keys
authorized_keys 100% 1190 1.2KB/s 00:00
5.一个错误
?
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: UNPROTECTED PRIVATE KEY FILE! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
Permissions 0644 f |