一、准备工作
系统：centos7
jdk:1.8
hadoop:2.6.0
2.我们要关闭系统的防火墙！！！
[root@Master ~]# cd /tools/
#永久关闭防火墙
[root@Master tools]# systemctl disable firewalld
#暂时关闭防火墙
[root@Master tools]# systemctl stop firewalld
3.修改用户名以及对应的IP
[root@Master tools]# hostname
Master
[root@Master tools]# vi /etc/hostname
Master
[root@Master tools]# vi /etc/hosts
192.168.0.3 Master
4.进行SSH免密互登设置
ssh-keygen -t dsa
在命令执行过程中敲击两遍回车
[root@Master tools]# ssh-keygen -t dsa
Generating public/private dsa key pair.
Enter file in which to save the key (/root/.ssh/id_dsa):
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_dsa.
Your public key has been saved in /root/.ssh/id_dsa.pub.
The key fingerprint is:
SHA256:xKYiupj804dqQ2V/4kNa3SF0Iz5JPfQ4df1TYtk2c8s root@Master
The key's randomart image is:
+---[DSA 1024]----+
| o. . +.|
| . + =+ =o*|
| B +ooo.oB|
| o + = .. E.|
| . + o S + . .|
| . o . = o . |
|. . . * o |
|oo + + + |
|+.oo+ . . |
+----[SHA256]-----+
[root@Master tools]#
二、安装JAVA环境
1. jdk安装这里不做赘述，网上帖子很多。
2. 测试
java -version
显示 java 版本信息，则说明 JDK 安装成功：
[root@Master tools]# java -version
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
[root@Master tools]#
三、搭建Hadoop环境
[root@Master tools]# mv hadoop-2.6.0.tar.gz /usr/local/
1.先切换到 /usr/local/
[root@Master tools]# cd /usr/local/
[root@Master local]# ll
total 191416
drwxr-xr-x. 2 root root 6 Apr 11 2018 bin
drwxr-xr-x. 2 root root 6 Apr 11 2018 etc
drwxr-xr-x. 2 root root 6 Apr 11 2018 games
drwxr-xr-x 10 grafana grafana 183 Jul 31 10:52 grafana
drwxr-xr-x 9 grafana grafana 158 Jul 31 10:08 grafana.bak
-rw-r--r-- 1 root root 195257604 May 23 2016 hadoop-2.6.0.tar.gz
drwxr-xr-x. 2 root root 6 Apr 11 2018 include
drwxr-xr-x 6 root root 53 Oct 12 15:39 keepalived
drwxrwxr-x 9 nagios nagios 4096 Oct 12 15:38 keepalived-1.4.2
-rw-r--r-- 1 root root 738096 Jun 23 18:02 keepalived-1.4.2.tar.gz
drwxr-xr-x. 2 root root 6 Apr 11 2018 lib
drwxr-xr-x. 2 root root 6 Apr 11 2018 lib64
drwxr-xr-x. 2 root root 6 Apr 11 2018 libexec
drwxr-xr-x 5 root root 164 Sep 24 14:18 mongodb
drwxr-xr-x 9 root root 94 Jul 28 16:33 nagios
drwxr-xr-x 12 root root 198 Oct 12 15:23 nginx
drwxrwxrwx 2 3434 3434 56 Jun 5 2019 node_exporter
-rw------- 1 root root 3417 Jul 31 14:11 nohup.out
drwxr-xr-x 5 prometheus prometheus 170 Jul 31 14:49 prometheus
drwxr-xr-x. 2 root root 6 Apr 11 2018 sbin
drwxr-xr-x. 5 root root 49 Jul 28 09:18 share
drwxr-xr-x. 2 root root 6 Apr 11 2018 src
[root@Master local]#
2.解压hadoop安装包
[root@Master local]# tar -zxvf hadoop-2.6.0.tar.gz
[root@Master local]# mv hadoop-2.6.0 hadoop
3.新建几个目录
在/usr/local/hadoop-2.6.0目录下新建几个目录，复制粘贴执行下面的命令：
[root@Master hadoop-2.6.0]# pwd
/usr/local/hadoop-2.6.0
[root@Master hadoop-2.6.0]# ll
total 28
drwxr-xr-x 2 20000 20000 194 Nov 14 2014 bin
drwxr-xr-x 3 20000 20000 20 Nov 14 2014 etc
drwxr-xr-x 2 20000 20000 106 Nov 14 2014 include
drwxr-xr-x 3 20000 20000 20 Nov 14 2014 lib
drwxr-xr-x 2 20000 20000 239 Nov 14 2014 libexec
-rw-r--r-- 1 20000 20000 15429 Nov 14 2014 LICENSE.txt
-rw-r--r-- 1 20000 20000 101 Nov 14 2014 NOTICE.txt
-rw-r--r-- 1 20000 20000 1366 Nov 14 2014 README.txt
drwxr-xr-x 2 20000 20000 4096 Nov 14 2014 sbin
drwxr-xr-x 4 20000 20000 31 Nov 14 2014 share
[root@Master hadoop-2.6.0]# mkdir /usr/local/hadoop-2.6.0/hadoop
[root@Master hadoop-2.6.0]# mkdir /usr/local/hadoop-2.6.0/hadoop/tmp
[root@Master hadoop-2.6.0]# mkdir /usr/local/hadoop-2.6.0/hadoop/var
[root@Master hadoop-2.6.0]# mkdir /usr/local/hadoop-2.6.0/hadoop/dfs
[root@Master hadoop-2.6.0]# mkdir /usr/local/hadoop-2.6.0/hadoop/dfs/name
[root@Master hadoop-2.6.0]# mkdir /usr/local/hadoop-2.6.0/hadoop/dfs/data
4. 修改/usr/local/hadoop-2.6.0/etc/hadoop中的一系列配置文件
/usr/local/hadoop-2.6.0/etc/hadoop
4.1我们先切换到该目录下，查看该目录下的文件
[root@Master hadoop]# cd /usr/local/hadoop-2.6.0/etc/hadoop
[root@Master hadoop]# ll
total 152
-rw-r--r-- 1 20000 20000 4436 Nov 14 2014 capacity-scheduler.xml
-rw-r--r-- 1 20000 20000 1335 Nov 14 2014 configuration.xsl
-rw-r--r-- 1 20000 20000 318 Nov 14 2014 container-executor.cfg
-rw-r--r-- 1 20000 20000 774 Nov 14 2014 core-site.xml
-rw-r--r-- 1 20000 20000 3670 Nov 14 2014 hadoop-env.cmd
-rw-r--r-- 1 20000 20000 4224 Nov 14 2014 hadoop-env.sh
-rw-r--r-- 1 20000 20000 2598 Nov 14 2014 hadoop-metrics2.properties
-rw-r--r-- 1 20000 20000 2490 Nov 14 2014 hadoop-metrics.properties
-rw-r--r-- 1 20000 20000 9683 Nov 14 2014 hadoop-policy.xml
-rw-r--r-- 1 20000 20000 775 Nov 14 2014 hdfs-site.xml
-rw-r--r-- 1 20000 20000 1449 Nov 14 2014 httpfs-env.sh
-rw-r--r-- 1 20000 20000 1657 Nov 14 2014 httpfs-log4j.properties
-rw-r--r-- 1 20000 20000 21 Nov 14 2014 httpfs-signature.secret
-rw-r--r-- 1 20000 20000 620 Nov 14 2014 httpfs-site.xml
-rw-r--r-- 1 20000 20000 3523 Nov 14 2014 kms-acls.xml
-rw-r--r-- 1 20000 20000 1325 Nov 14 2014 kms-env.sh
-rw-r--r-- 1 20000 20000 1631 Nov 14 2014 kms-log4j.properties
-rw-r--r-- 1 20000 20000 5511 Nov 14 2014 kms-site.xml
-rw-r--r-- 1 20000 20000 11291 Nov 14 2014 log4j.properties
-rw-r--r-- 1 20000 20000 938 Nov 14 2014 mapred-env.cmd
-rw-r--r-- 1 20000 20000 1383 Nov 14 2014 mapred-env.sh
-rw-r--r-- 1 20000 20000 4113 Nov 14 2014 mapred-queues.xml.template
-rw-r--r-- 1 20000 20000 758 Nov 14 2014 mapred-site.xml.template
-rw-r--r-- 1 20000 20000 10 Nov 14 2014 slaves
-rw-r--r-- 1 20000 20000 2316 Nov 14 2014 ssl-client.xml.example
-rw-r--r-- 1 20000 20000 2268 Nov 14 2014 ssl-server.xml.example
-rw-r--r-- 1 20000 20000 2237 Nov 14 2014 yarn-env.cmd
-rw-r--r-- 1 20000 20000 4567 Nov 14 2014 yarn-env.sh
-rw-r--r-- 1 20000 20000 690 Nov 14 2014 yarn-site.xml
[root@Master hadoop]#
4.2修改core-site.xml
[root@Master hadoop]# vi core-site.xml
在<configuration>节点内加入配置:
<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/local/hadoop-2.6.0/hadoop/tmp</value>
</property>
<property>
<name>fs.defaultFS</name>
<value>hdfs://Master:9000</value>
</property>
</configuration>
**注意： hdfs://Master:9000 此处应与hostname保持一致 **
4.3修改hadoop-env.sh
[root@Master hadoop]# echo $JAVA_HOME
/usr/java/jdk1.8.0_131
[root@Master hadoop]# vi hadoop-env.sh
将export JAVA_HOME=${JAVA_HOME}
修改为：
export JAVA_HOME=/usr/java/jdk1.8.0_131
说明：修改为自己的JDK路径。此处可以与系统JAVA环境一致，也可以单独配置。
4.4修改hdfs-site.xml
[root@Master hadoop]# vi hdfs-site.xml
在<configuration> 节点内加入配置:
<configuration>
<property>
<name>dfs.name.dir</name>
<value>/usr/local/hadoop-2.6.0/hadoop/dfs/name</value>
</property>
<property>
<name>dfs.data.dir</name>
<value>/usr/local/hadoop-2.6.0/hadoop/dfs/data</value>
</property>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>
4.5 修改mapred-site.xml.template
[root@Master hadoop]# vi mapred-site.xml.template
在<configuration> 节点内加入配置:
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>Master:49001</value>
</property>
<property>
<name>mapred.local.dir</name>
<value>/usr/local/hadoop-2.6.0/hadoop/var</value>
</property>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>
4.5 修改yarn-site.xml文件
[root@Master hadoop]# vi yarn-site.xml
在<configuration> 节点内加入配置:
<configuration>
<property>
<name>yarn.resourcemanager.hostname</name>
<value>Master</value>
</property>
<property>
<name>yarn.resourcemanager.address</name>
<value>${yarn.resourcemanager.hostname}:8032</value>
</property>
<property>
<name>yarn.resourcemanager.scheduler.address</name>
<value>${yarn.resourcemanager.hostname}:8030</value>
</property>
<property>
<name>yarn.resourcemanager.webapp.address</name>
<value>${yarn.resourcemanager.hostname}:8088</value>
</property>
<property>
<name>yarn.resourcemanager.webapp.https.address</name>
<value>${yarn.resourcemanager.hostname}:8090</value>
</property>
<property>
<name>yarn.resourcemanager.resource-tracker.address</name>
<value>${yarn.resourcemanager.hostname}:8031</value>
</property>
<property>
<name>yarn.resourcemanager.admin.address</name>
<value>${yarn.resourcemanager.hostname}:8033</value>
</property>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.scheduler.maximum-allocation-mb</name>
<value>2048</value>
</property>
<property>
<name>yarn.nodemanager.vmem-pmem-ratio</name>
<value>2.1</value>
</property>
<property>
<name>yarn.nodemanager.resource.memory-mb</name>
<value>2048</value>
</property>
<property>
<name>yarn.nodemanager.vmem-check-enabled</name>
<value>false</value>
</property>
</configuration>
四、启动Hadoop
1.切换到/usr/local/hadoop-2.6.0/bin
[root@Master hadoop]# cd /usr/local/hadoop-2.6.0/bin
[root@Master bin]# pwd
/usr/local/hadoop-2.6.0/bin
[root@Master bin]# ll
total 440
-rwxr-xr-x 1 20000 20000 159183 Nov 14 2014 container-executor
-rwxr-xr-x 1 20000 20000 5479 Nov 14 2014 hadoop
-rwxr-xr-x 1 20000 20000 8298 Nov 14 2014 hadoop.cmd
-rwxr-xr-x 1 20000 20000 11142 Nov 14 2014 hdfs
-rwxr-xr-x 1 20000 20000 6923 Nov 14 2014 hdfs.cmd
-rwxr-xr-x 1 20000 20000 5205 Nov 14 2014 mapred
-rwxr-xr-x 1 20000 20000 5949 Nov 14 2014 mapred.cmd
-rwxr-xr-x 1 20000 20000 1776 Nov 14 2014 rcc
-rwxr-xr-x 1 20000 20000 201659 Nov 14 2014 test-container-executor
-rwxr-xr-x 1 20000 20000 11380 Nov 14 2014 yarn
-rwxr-xr-x 1 20000 20000 10895 Nov 14 2014 yarn.cmd
[root@Master bin]#
2. 初始化
[root@Master bin]# ./hadoop namenode -format
20/11/11 11:42:19 INFO namenode.NNConf: ACLs enabled? false
20/11/11 11:42:19 INFO namenode.NNConf: XAttrs enabled? true
20/11/11 11:42:19 INFO namenode.NNConf: Maximum size of an xattr: 16384
20/11/11 11:42:19 INFO namenode.FSImage: Allocated new BlockPoolId: BP-163737534-192.168.0.3-1605066139267
20/11/11 11:42:19 INFO common.Storage: Storage directory /usr/local/hadoop-2.6.0/hadoop/dfs/name has been successfully formatted.
20/11/11 11:42:19 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid >= 0
20/11/11 11:42:19 INFO util.ExitUtil: Exiting with status 0
20/11/11 11:42:19 INFO namenode.NameNode: SHUTDOWN_MSG:
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at Master/192.168.0.3
************************************************************/
[root@Master bin]#
3.启动
[root@Master bin]# pwd
/usr/local/hadoop-2.6.0/bin
[root@Master bin]# find / -name 'start-all.sh'
/usr/local/hadoop-2.6.0/sbin/start-all.sh
执行初始化脚本，也就是执行命令：
[root@Master bin]# cd /usr/local/hadoop-2.6.0/sbin
[root@Master sbin]# ll
total 120
-rwxr-xr-x 1 20000 20000 2752 Nov 14 2014 distribute-exclude.sh
-rwxr-xr-x 1 20000 20000 6452 Nov 14 2014 hadoop-daemon.sh
-rwxr-xr-x 1 20000 20000 1360 Nov 14 2014 hadoop-daemons.sh
-rwxr-xr-x 1 20000 20000 1640 Nov 14 2014 hdfs-config.cmd
-rwxr-xr-x 1 20000 20000 1427 Nov 14 2014 hdfs-config.sh
-rwxr-xr-x 1 20000 20000 2291 Nov 14 2014 httpfs.sh
-rwxr-xr-x 1 20000 20000 2059 Nov 14 2014 kms.sh
-rwxr-xr-x 1 20000 20000 4080 Nov 14 2014 mr-jobhistory-daemon.sh
-rwxr-xr-x 1 20000 20000 1648 Nov 14 2014 refresh-namenodes.sh
-rwxr-xr-x 1 20000 20000 2145 Nov 14 2014 slaves.sh
-rwxr-xr-x 1 20000 20000 1779 Nov 14 2014 start-all.cmd
-rwxr-xr-x 1 20000 20000 1471 Nov 14 2014 start-all.sh
-rwxr-xr-x 1 20000 20000 1128 Nov 14 2014 start-balancer.sh
-rwxr-xr-x 1 20000 20000 1401 Nov 14 2014 start-dfs.cmd
-rwxr-xr-x 1 20000 20000 3705 Nov 14 2014 start-dfs.sh
-rwxr-xr-x 1 20000 20000 1357 Nov 14 2014 start-secure-dns.sh
-rwxr-xr-x 1 20000 20000 1571 Nov 14 2014 start-yarn.cmd
-rwxr-xr-x 1 20000 20000 1347 Nov 14 2014 start-yarn.sh
-rwxr-xr-x 1 20000 20000 1770 Nov 14 2014 stop-all.cmd
-rwxr-xr-x 1 20000 20000 1462 Nov 14 2014 stop-all.sh
-rwxr-xr-x 1 20000 20000 1179 Nov 14 2014 stop-balancer.sh
-rwxr-xr-x 1 20000 20000 1455 Nov 14 2014 stop-dfs.cmd
-rwxr-xr-x 1 20000 20000 3206 Nov 14 2014 stop-dfs.sh
-rwxr-xr-x 1 20000 20000 1340 Nov 14 2014 stop-secure-dns.sh
-rwxr-xr-x 1 20000 20000 1642 Nov 14 2014 stop-yarn.cmd
-rwxr-xr-x 1 20000 20000 1340 Nov 14 2014 stop-yarn.sh
-rwxr-xr-x 1 20000 20000 4295 Nov 14 2014 yarn-daemon.sh
-rwxr-xr-x 1 20000 20000 1353 Nov 14 2014 yarn-daemons.sh
[root@Master sbin]# ./start-all.sh
第一次执行上面的启动命令，会需要我们进行交互操作，在问答界面上输入yes回车。
4.验证访问
访问：http://192.168.0.3:50070
访问：http://192.168.0.3:8088