一 完全分布式集群(单点）
Hadoop官方地址：http://hadoop.apache.org/
1 准备3台客户机
1.1防火墙,静态IP,主机名
关闭防火墙，设置静态IP，主机名此处略，参考 Linux之CentOS7.5安装及克隆
1.2 修改host文件
我们希望三个主机之间都能够使用主机名称的方式相互访问而不是IP，我们需要在hosts中配置其他主机的host。因此我们在主机的/etc/hosts下均进行如下配置：
[root@hadoop0 ~]# vi /etc/hosts 配置主机host 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 192.168.100.21 hadoop0 192.168.100.22 hadoop1 192.168.100.23 hadoop2 将配置发送到其他主机（同时在其他主机上配置） [root@hadoop0 ~]# scp -r /etc/hosts root@hadoop1:/etc/ [root@hadoop0 ~]# scp -r /etc/hosts root@hadoop2:/etc/ 测试 [root@hadoop0 ~]# ping hadoop0 [root@hadoop0 ~]# ping hadoop1 [root@hadoop0 ~]# ping hadoop2
1.3 添加用户账号
在所有的主机下均建立一个账号hadoop用来运行hadoop ，并将其添加至sudoers中 [root@hadoop0 ~]# useradd hadoop #添加用户通过手动输入修改密码 [root@hadoop0 ~]# passwd hadoop #更改用户 hadoop 的密码 hadoop #密码
#passwd： 所有的身份验证令牌已经成功更新。 设置hadoop用户具有root权限 修改 /etc/sudoers 文件，找到下面一行，在root下面添加一行，如下所示： [root@hadoop0 ~]# vim /etc/sudoers
#找到这里 ## Allow root to run any commands anywhere root ALL=(ALL) ALL hadoop ALL=(ALL) ALL
修改完毕 ：wq！ 保存退出，现在可以用hadoop帐号登录，然后用命令 su hadoop ，切换用户即可获得root权限进行操作。
1.4 /目录下创建文件夹
1）在root用户下创建hadoop文件夹 [root@hadoop0 /]# cd / [root@hadoop0 /]# mkdir hadoop 2）修改hadoop文件夹的所有者 [root@hadoop0 opt]# chown -R hadoop:hadoop /hadoop 3）查看hadoop文件夹的所有者 [root@hadoop0 /]# ll
drwxr-xr-x. 4 hadoop hadoop 46 May 10 16:56 hadoop
2 安装配置jdk1.8
[root@hadoop0 ~]# rpm -qa|grep java #查询是否安装java软件： 这里使用官网下载好的tar包传到服务器 /hadoop 下 [root@hadoop0 hadoop]# tar -zxvf jdk-8u181-linux-x64.tar.gz [root@hadoop0 hadoop]# mv jdk1.8.0_181 jdk1.8 设置JAVA_HOME
[root@hadoop0 hadoop]# vim /etc/profile
#在文件末尾添加
#JAVA
export JAVA_HOME=/hadoop/jdk1.8
export JRE_HOME=/hadoop/jdk1.8/jre
export CLASSPATH=.:$CLASSPATH:$JAVA_HOME/lib:$JRE_HOME/lib
export PATH=$PATH:$JAVA_HOME/bin:$JAVA_HOME/sbin
[root@hadoop0 hadoop]# source /etc/profile #重启配置文件生效
#检查是否配置成功
[hadoop@hadoop0 /]$ java -version
java version "1.8.0_181"
Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.181-b13, mixed mode)
3 安装hadoop集群
3.1 集群部署规划
| 节点名称 | NN1 | NN2 | DN | RM | NM |
| hadoop0 | NameNode | DataNode | ResourceManager | NodeManager | |
| hadoop1 | SecondaryNameNode | DataNode | NodeManager | ||
| hadoop2 | DataNode | NodeManager |
3.2 设置SSH免密钥
关于ssh免密码的设置，要求每两台主机之间设置免密码，自己的主机与自己的主机之间也要求设置免密码。 这项操作可以在hadoop用户下执行，执行完毕公钥在/home/hadoop/.ssh/id_rsa.pub
[hadoop@hadoop0 ~]# ssh-keygen -t rsa [hadoop@hadoop0 ~]# ssh-copy-id hadoop0 [hadoop@hadoop0 ~]# ssh-copy-id hadoop1 [hadoop@hadoop0 ~]# ssh-copy-id hadoop2
node1与node2为namenode节点要相互免秘钥 HDFS的HA
[hadoop@hadoop1 ~]# ssh-keygen -t rsa [hadoop@hadoop1 ~]# ssh-copy-id hadoop1 [hadoop@hadoop1 ~]# ssh-copy-id hadoop0 [hadoop@hadoop1 ~]# ssh-copy-id hadoop2
node2与node3为yarn节点要相互免秘钥 YARN的HA
[hadoop@hadoop2 ~]# ssh-keygen -t rsa [hadoop@hadoop2 ~]# ssh-copy-id hadoop2 [hadoop@hadoop2 ~]# ssh-copy-id hadoop0 [hadoop@hadoop2 ~]# ssh-copy-id hadoop1
3.3 解压安装hadoop
[hadoop@hadoop0 hadoop]# tar -zxvf hadoop-2.7.7.tar.gz
4 配置hadoop集群
注意：配置文件在hadoop2.7.7/etc/hadoop/下
4.1 修改core-site.xml
[hadoop@hadoop0 hadoop]$ vi core-site.xml <configuration>
<!-- 指定HDFS中NameNode的地址 -->
<property>
<name>fs.defaultFS</name>
<value>hdfs://hadoop0:9000</value>
</property>
<!-- 指定hadoop运行时产生文件的存储目录,注意tmp目录需要创建 -->
<property>
<name>hadoop.tmp.dir</name>
<value>/hadoop/hadoop-2.7.7/tmp</value>
</property>
</configuration>
4.2 修改hadoop-env.sh
[hadoop@hadoop0 hadoop]$ vi hadoop-env.sh 修改 export JAVA_HOME=/hadoop/jdk1.8
4.3 修改hdfs-site.xml
[hadoop@hadoop0 hadoop]$ vi hdfs-site.xml <configuration>
<!-- 设置dfs副本数，不设置默认是3个 -->
<property>
<name>dfs.replication</name>
<value>2</value>
</property>
<!-- 设置namenode数据存放路径 -->
<property>
<name>dfs.name.dir</name>
<value>/hadoop/hadoop-2.7.7/dfs/name</value>
</property>
<!-- 设置datanode数据存放路径 -->
<property>
<name>dfs.data.dir</name>
<value>/hadoop/hadoop-2.7.7/dfs/data</value>
</property>
<!-- 设置secondname的端口 -->
<property>
<name>dfs.namenode.secondary.http-address</name>
<value>hadoop1:50090</value>
</property>
</configuration>
4.4 修改slaves
[hadoop@hadoop0 hadoop]$ vi slaves hadoop0 hadoop1 hadoop2
4.5 修改mapred-site.xml
[hadoop@hadoop0 hadoop]# mv mapred-site.xml.template mapred-site.xml
[hadoop@hadoop0 hadoop]$ vi mapred-site.xml
<configuration>
<!-- 指定mr运行在yarn上 -->
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>
4.6 修改yarn-site.xml
[hadoop@hadoop0 hadoop]$ vi yarn-site.xml
<configuration>
<!-- reducer获取数据的方式 -->
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<!-- 指定YARN的ResourceManager的地址 -->
<property>
<name>yarn.resourcemanager.hostname</name>
<value>hadoop0</value>
</property>
</configuration>
4.9 分发hadoop到节点
[hadoop@hadoop0 /]# scp -r hadoop/ hadoop@hadoop1:$PWD [hadoop@hadoop0 /]# scp -r hadoop/ hadoop@hadoop2:$PWD
4.10 配置环境变量
[hadoop@hadoop0 ~]$ sudo vim /etc/profile 末尾追加 export HADOOP_HOME=/hadoop/hadoop-2.7.7 export PATH=$PATH:$HADOOP_HOME/bin:$HADOOP_HOME/sbin 编译生效 source /etc/profile
5 启动验证集群
5.1 启动集群
如果集群是第一次启动，需要格式化namenode
[hadoop@hadoop0 hadoop-2.7.7]$ hdfs namenode -format
启动Hdfs：
[hadoop@hadoop0 ~]# start-dfs.sh
Starting namenodes on [hadoop0]
hadoop0: starting namenode, logging to /hadoop/hadoop-2.7.7/logs/hadoop-hadoop-namenode-hadoop0.out
hadoop0: starting datanode, logging to /hadoop/hadoop-2.7.7/logs/hadoop-hadoop-datanode-hadoop0.out
hadoop2: starting datanode, logging to /hadoop/hadoop-2.7.7/logs/hadoop-hadoop-datanode-hadoop2.out
hadoop1: starting datanode, logging to /hadoop/hadoop-2.7.7/logs/hadoop-hadoop-datanode-hadoop1.out
Starting secondary namenodes [hadoop1]
hadoop1: starting secondarynamenode, logging to /hadoop/hadoop-2.7.7/logs/hadoop-hadoop-secondarynamenode-hadoop1.out
启动Yarn： 注意：Namenode和ResourceManger如果不是同一台机器，不能在NameNode上启动 yarn，应该在ResouceManager所在的机器上启动yarn。
[hadoop@hadoop1 ~]# start-yarn.sh
starting yarn daemons
starting resourcemanager, logging to /hadoop/hadoop-2.7.7/logs/yarn-hadoop-resourcemanager-hadoop0.out
hadoop2: starting nodemanager, logging to /hadoop/hadoop-2.7.7/logs/yarn-hadoop-nodemanager-hadoop2.out
hadoop1: starting nodemanager, logging to /hadoop/hadoop-2.7.7/logs/yarn-hadoop-nodemanager-hadoop1.out
hadoop0: starting nodemanager, logging to /hadoop/hadoop-2.7.7/logs/yarn-hadoop-nodemanager-hadoop0.out
jps查看进程
[hadoop@hadoop0 hadoop-2.7.7]$ jps
2162 NodeManager
2058 ResourceManager
2458 Jps
1692 NameNode
1820 DataNode
[hadoop@hadoop1 hadoop]$ jps
1650 Jps
1379 DataNode
1478 SecondaryNameNode
1549 NodeManager
[hadoop@hadoop2 hadoop]$ jps
1506 DataNode
1611 NodeManager
1711 Jps
5.2 Hadoop启动停止方式
1）各个服务组件逐一启动 分别启动hdfs组件： hadoop-daemon.sh start|stop namenode|datanode|secondarynamenode 启动yarn： yarn-daemon.sh start|stop resourcemanager|nodemanager 2）各个模块分开启动（配置ssh是前提）常用 start|stop-dfs.sh start|stop-yarn.sh 3）全部启动（不建议使用） start|stop-all.sh
5.3 集群时间同步
是否安装ntp
[hadoop@hadoop0 hadoop-2.7.7]$ ntp
bash: ntp: command not found
[hadoop@hadoop0 hadoop-2.7.7]$ sudo yum install ntp #安装ntp
[hadoop@hadoop0 hadoop-2.7.7]$ sudo ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime #linux的时区设置为中国上海时区
[hadoop@hadoop0 hadoop-2.7.7]$ sudo ntpdate time.windows.com #与当地网络时间同步
12 May 12:33:09 ntpdate[2571]: adjust time server 13.70.22.122 offset 0.029582 sec
[hadoop@hadoop0 hadoop-2.7.7]$ date #查看是否同步成功
Sun May 12 12:33:16 CST 2019