本案例规划：
原集群：
5台PC机
操作系统：RedHat Enterprise Server 6.5
root用户及密码：password
hadoop用户及密码：password
新增后集群：
4台PC机
操作系统：RedHat Enterprise Server 6.5
root用户及密码：password
hadoop用户及密码：password
集群内各服务器添加用户：
[root@hadoop006 ~]#useradd hadoop
[root@hadoop006 ~]#passwd hadoop
注：在新节点中添加
[root@hadoop001 ~]#vim /etc/hosts
132.194.43.180 hadoop001
132.194.43.181 hadoop002
132.194.43.182 hadoop003
132.194.43.183 hadoop004
132.194.43.184 hadoop005 hivemysql
132.194.41.186 hadoop006
132.194.41.187 hadoop007
132.194.41.188 hadoop008
132.194.41.189 hadoop009
[root@hadoop001 ~]#vim /etc/sysconfig/network
NETWORKING=yes
HOSTNAME=hadoop001
注：重启生效（service network restart），如果生效不了，只有手动重启服务器，使其生效
配置所有服务器root用户之间的SSH互信以及hadoop用户之间的互信。
以下以root用户为例，hadoop用户配置同理。
[root@hadoop001 ~]$ ssh-keygen
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): [Enter key]
Enter passphrase (empty for no passphrase): [Enter key]
Enter same passphrase again: [Enter key]
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:
cd:5a:2a:bb:4a:49:97:8a:2d:70:19:18:60:56:9c:78 root@hadoop001
The key's randomart image is:
+--[ RSA 2048]----+
|+o+.. |
|o+ E |
|. o |
| o . o |
|. o . o S + |
| o + + + |
| o = . o |
| o o |
| ..o. |
[root@hadoop001 ~]$ ssh-copy-id [email protected]
[email protected]'s password:
Now try logging into the machine, with "ssh '[email protected]'", and check in:
.ssh/authorized_keys
to make sure we haven't added extra keys that you weren't expecting.
[root@hadoop001 ~]$ ssh 132.194.41.186
[root@hadoop001 ~]$ exit
logout
Connection to132.194.41.186 closed.
注：其他新增节点同上（41.186 ,187 ,188 ,189）
注：所有新增节点上添加
[root@hadoop00 6~]#vim /etc/ntp.conf
[root@hadoop00 6~]#service ntpd start
此步在root用户下运行。
所有节点都需创建该目录，用于存放HDFS数据和临时数据。
主节点只需创建目录即可，数据节点需创建目录并挂载独立磁盘。
目录创建个数根据挂载磁盘数而定，本例为3个。
[root@hadoop00 1~]#mkdir -p /data/{disk1,disk2,disk3 }
[root@hadoop00 1~]#chown -R hadoop:hadoop /data/{disk1,disk2,disk3 }
[root@hadoop00 6~]#vim /etc/security/limits.conf，末尾添加
hadoop soft nofile 131072
hadoop hard nofile 131072
[root@hadoop00 6~]#vim /etc/security/limits.d/90-nproc.conf，末尾添加
hadoop soft nproc unlimited
hadoop hard nproc unlimited
7.1、软件包
将beh软件包解压缩至/opt目录下。并将/opt/beh目录修改为hadoop属主。
[root@hadoop001 ~]#scp /opt/ beh.tar.gz /root@hadoop006:/opt/
[root@hadoop006 ~]#tar -zxvf /opt/beh.tar.gz
[root@hadoop006 ~]#chown -R hadoop:hadoop /opt/beh
7.2、修改环境变量
修改用户对应的如下文件：（添加的新节点）
[root@hadoop006 ~]#vim /home/hadoop/.bash_profile，添加
source /opt/beh/conf/beh_env
source /opt/beh/conf/mysql_env
7.3、配置文件
7.3.1、spark
##此文件中为所有的worker节点，一般添加所有的datanode即可，每个一行
[root@hadoop001 ~]#vim /opt/beh/core/spark/conf/slaves
hadoop003
hadoop004
hadoop005
hadoop006
hadoop007
hadoop008
hadoop009
7.3.2、HDFS：
此步可在hadoop下操作。红色字体为需要根据环境修改的地方。
[hadoop@hadoop001~]#vim /opt/beh/core/hadoop/etc/hadoop/slaves
##此文件中hostname为所有datanode数据节点主机名，一行一个
##本例中datanode节点为hadoop003~hadoop009
hadoop003
hadoop004
hadoop005
hadoop006
hadoop007
hadoop008
hadoop009
7.3.2、yarn：
[hadoop@hadoop001~]#vim /opt/beh/core/hadoop/etc/hadoop/yarn-site.xml
<property>
<name>yarn.nodemanager.local-dirs</name> <value>/data/disk1/tmp/yarn/local,/data/disk2/tmp/yarn/local,/data/disk3/tmp/yarn/local </value>
<final>false</final>
</property>
此路径应与实际磁盘相同，
7.4、 网络性能测试
Ø 测试工具为nerperf。以hadoop001为server端进行测试。其他节点为客户端测试与hadoop001之间的传输速率。测试命令如下为
Ø hadoop001为：
重启服务：
[root@hadoop001~]#/opt/beh/mon/netperf/bin/netserver
Ø hadoop002-hadoop012：
测试：
[root@hadoop001~]#/opt/beh/mon/netperf/bin/netperf -H 132.194.43.170 -t TCP_STREAM -l 10
[hadoop @hadoop001~]#cd /opt/beh/core/hadoop/bin
8.1、YARN
在hadoop001上执行：
[hadoop@hadoop001 ~]$start-yarn.sh
在hadoop002上启动resourcemanager：
[hadoop@hadoop001 ~]$yarn-daemon.sh start resourcemanager
在hadoop001上启动jobhistory server
[hadoop@hadoop001~]$mr-jobhistory-daemon.sh start historyserver
来源：