安装hadoop伪分布式

修改hosts

cat /etc/hosts
127.0.0.1 mo.don.com

创建用户

useradd hadoop
passwd hadoop

sudo授权

visudo
hadoop  ALL=(ALL)       NOPASSWD: ALL

切换用户

su - hadoop

下载解压

wget http://mirror.bit.edu.cn/apache/hadoop/common/hadoop-3.1.2/hadoop-3.1.2.tar.gz
tar xf hadoop-3.1.2.tar.gz

创建工作目录

mkdir moudles && mv hadoop-3.1.2 moudles
mkdir -p  moudles/data/{datanode,namenode,tmp}
cd moudles/hadoop-3.1.2

添加环境变量

cat /etc/profile

## add hadoop

export HADOOP_HOME=/home/hadoop/moudles/hadoop-3.1.2
export PATH=$HADOOP_HOME/bin/:$HADOOP_HOME/sbin:$PATH

修改配置文件

cat /home/hadoop/moudles/hadoop-3.1.2/etc/hadoop/hadoop-env.sh
export JAVA_HOME=/usr/local/jdk1.8.0

cat /home/hadoop/moudles/hadoop-3.1.2/etc/hadoop/core-site.xml
<configuration>
    <!-- HDFS资源路径 -->
    <property>
        <name>fs.defaultFS</name>
        <value>hdfs://mo.do.com:9820</value>
    </property>
    <!-- 在见面界面访问数据使用的用户名 -->
    <property>
        <name>hadoop.http.staticuser.user</name>
        <value>heron</value>
    </property>
    <!-- Hadoop临时文件存放目录 -->
    <property>
        <name>hadoop.tmp.dir</name>
        <value>/home/hadoop/moudles/data/tmp</value>
    </property>
    <!-- 垃圾文件保留时间(秒) -->
    <property>
      <name>fs.trash.interval</name>
      <value>7200</value>
    </property>
</configuration>

cat /home/hadoop/moudles/hadoop-3.1.2/etc/hadoop/hdfs-site.xml
<configuration>
    <!-- 是否进行权限检查 -->
    <property>
        <name>dfs.permissions.enabled</name>
        <value>false</value>
    </property>
    <!-- 副本数 -->
    <property>
        <name>dfs.replication</name>
        <value>1</value>
    </property>
        <!-- namenode元数据存储路径 -->
    <property>
        <name>dfs.namenode.name.dir</name>
        <value>/home/hadoop/moudles/data/namenode</value>
    </property>
        <!-- 数据存储路径 -->
    <property>
        <name>dfs.datanode.data.dir</name>
        <value>/home/hadoop/moudles/data/datanode</value>
    </property>
</configuration>

cat /home/hadoop/moudles/hadoop-3.1.2/etc/hadoop/yarn-site.xml
<configuration>
    <!-- resourceManager在哪台机器 -->
    <property>
        <name>yarn.resourcemanager.hostname</name>
        <value>mo.do.com</value>
    </property>
    <!-- 在nodemanager中运行mapreduce服务 -->
    <property>
        <name>yarn.nodemanager.aux-services</name>
        <value>mapreduce_shuffle</value>
    </property>
    <!-- 配置日志的聚集功能 -->
    <property>
        <name>yarn.log-aggregation-enable</name>
        <value>true</value>
    </property>
    <property>
        <name>yarn.log-aggregation.retain-seconds</name>
        <value>604800</value>
    </property>
</configuration>

cat /home/hadoop/moudles/hadoop-3.1.2/etc/hadoop/mapred-site.xml

<configuration>
    <!-- mapreduce运行在yarn上面 -->
    <property>
        <name>mapreduce.framework.name</name>
        <value>yarn</value>
    </property>
    <property>
        <name>yarn.app.mapreduce.am.env</name>
        <value>HADOOP_MAPRED_HOME=/home/hadoop/moudles/hadoop-3.1.2</value>
    </property>
    <property>
        <name>mapreduce.map.env</name>
        <value>HADOOP_MAPRED_HOME=/home/hadoop/moudles/hadoop-3.1.2</value>
    </property>
    <property>
        <name>mapreduce.reduce.env</name>
        <value>HADOOP_MAPRED_HOME=/home/hadoop/moudles/hadoop-3.1.2</value>
    </property>
</configuration>

格式化hdfs

hdfs namenode -format

启动hdfs/ Yarn

hdfs --daemon start namenode
hdfs --daemon start datanode
yarn --daemon start resourcemanager
yarn --daemon start nodemanager
yarn --daemon start timelineserver

查看启动状态

jps

浏览器查看

[http://mo.don.com:8188]: