ubuntu 18.04安装hadoop 2.9.2

先试用命令su，进入root用户权限

下载jdk及hadoop

分别解压，/java，/hadoop

tar xvf xxx.tar（在所在目录下进行，或者）
tar xvf /x/x/xxx.tar -C /x/x
java
/java/jdk1.8.0_241
hadoop
/hadoop/hadoop-2.9.2

注意：必须给hadoop安装目录重设权限

chmod 777 -R hadoop-x.x.x

设置环境变量

第一个是对当前用户的，第二个是对所有用户的，改了第二个重启之后依旧有效

gedit ~/.bashrc
gedit /etc/profile
export JAVA_HOME=/java/jdk1.8.0_241
export HADOOP_HOME=/hadoop/hadoop-2.9.2
export CLASSPATH=.:$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar 
export PATH=.:$HADOOP_HOME/bin:$JAVA_HOME/bin:$HADOOP_HOME/sbin:$JAVA_HOME/jre/bin:$PATH
//把JAVA_HOME改成绝对路径
gedit /hadoop/hadoop-2.9.2/etc/hadoop/hadoop-env.sh
export JAVA_HOME=/java/jdk1.8.0_241
//立即生效
source ~/.bashrc
source /etc/profile
//测试，新起一个终端，不要在root权限下
java -version
hadoop version

配置ssh

修改xml

core
<configuration>
        <property>
             <name>hadoop.tmp.dir</name>
             <value>file:/hadoop/hadoop-2.9.2/tmp</value>
        </property>
        <property>
             <name>fs.defaultFS</name>
             <value>hdfs://localhost:9000</value>
        </property>
</configuration>

hdfs 
<configuration>
        <property>
             <name>dfs.replication</name>
             <value>1</value>
        </property>
        <property>
             <name>dfs.namenode.name.dir</name>
             <value>file:/hadoop/hadoop-2.9.2/tmp/dfs/namenode</value>
        </property>
        <property>
             <name>dfs.datanode.data.dir</name>
             <value>file:/hadoop/hadoop-2.9.2/tmp/dfs/datanode</value>
        </property>
</configuration>

mapred
<configuration>
        <property>
             <name>mapreduce.framework.name</name>
             <value>yarn</value>
        </property>
</configuration>

yarn
<configuration>
    <property> 
        <name>yarn.nodemanager.aux-services</name> 
        <value>mapreduce_shuffle</value> 
    </property> 
    <property> 
        <name>yarn.nodemanager.aux-services.mapreduce.shuffle.class</name> 
        <value>org.apache.hadoop.mapred.ShuffleHandler</value> 
    </property> 
    <property> 
        <name>yarn.resourcemanager.hostname</name> 
        <value>localhost</value> 
    </property> 
</configuration>

配置hadoop

• hdfs namenode -format
• start-dfs.sh
• start-yarn.sh
• mr-jobhistoryserver.sh start historyserver 开启jobhistory
• start-all.sh
• stop-all.sh
• jps查看进程
• 测试wordcount
• hadoop fs -mkdir <>
• hadoop jar <jar dir>  <class> <input> <output>

web查看节点、资源管理、jobhistory：localhost:50070，8088，19888