四个节点
[root@master hadoop]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.1.100 master
192.168.1.101 slave1
192.168.1.102 slave2
192.168.1.103 slave3
master需要无密码远程登陆所有slave节点
[root@master local]# ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
0e:8e:9d:c9:55:01:a1:ed:e2:35:92:c7:c4:6a:a8:53 root@master
The key's randomart image is:
+--[ RSA 2048]----+
| oo. |
| + . |
| . + . |
| . * . |
| E B S |
| o B @ . |
| o . B . |
| . |
| |
+-----------------+
root@master local]# ssh-copy-id slave1
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@slave1's password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh 'slave1'"
and check to make sure that only the key(s) you wanted were added.
root@master local]# ssh-copy-id slave2
......
root@master local]# ssh-copy-id slave3
......
root@master local]# ssh-copy-id master
......
core-site.xml（四个节点）
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://master:9000</value>
</property>
</configuration>
配置slaves文件
[root@master hadoop]# cat /usr/local/hadoop/etc/hadoop/slaves
slave1
slave2
slave3
安装jdk
[root@master bin]# rpm -ivh ~/jdk-8u91-linux-x64.rpm （四个节点）
Preparing... ################################# [100%]
Updating / installing...
1:jdk1.8.0_91-2000:1.8.0_91-fcs ################################# [100%]
Unpacking JAR files...
tools.jar...
plugin.jar...
javaws.jar...
deploy.jar...
rt.jar...
jsse.jar...
charsets.jar...
localedata.jar...
jfxrt.jar...
填加PATH变量（四个节点）
[root@master bin]# tail -2 /etc/profile
PATH=$PATH:/usr/local/hadoop/bin
JAVA_HOME=/usr/java/default/
填加JAVA_HOME（四个节点）
[root@master hadoop]# grep JAVA_HOME /usr/local/hadoop/etc/hadoop/hadoop-env.sh
# The only required environment variable is JAVA_HOME. All others are
# set JAVA_HOME in this file, so that it is correctly defined on
export JAVA_HOME=/usr/java/default
格式化（仅master）
hadoop namenode -format
启动集群（仅master）
start-dfs.sh
验证结果
[root@master hadoop]# jps
4290 NameNode
4382 Jps
查看集群报告
[root@master hadoop]# hdfs dfsadmin -report
