ssh-keygen  -t   rsa   -P  ''

192.168.157.148 hadoop01
192.168.157.149 hadoop02

mkdir  /root/hadoop
mkdir  /root/hadoop/tmp
mkdir  /root/hadoop/var
mkdir  /root/hadoop/dfs
mkdir  /root/hadoop/dfs/name
mkdir  /root/hadoop/dfs/data

cd /opt/hadoop/hadoop-2.9.1/etc/hadoop

vi core-site.xml

<property>
    <name>hadoop.tmp.dir</name>
    <value>/root/hadoop/tmp</value>
    <description>Abase for other temporary directories.</description>
</property>
<property>
    <name>fs.default.name</name>
    <value>hdfs://hadoop01:9000</value>
</property>

export   JAVA_HOME=/opt/java/jdk1.8.0_171

rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.65-3.b17.el7.x86_64
rpm -e --nodeps java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64
rpm -e --nodeps java-1.7.0-openjdk-1.7.0.91-2.6.2.3.el7.x86_64
rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.91-2.6.2.3.el7.x86_64

/etc/profile

JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.65-3.b17.el7.x86_64
java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64
JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.212.b04-0.el7_6.x86_64

PATH=$PATH:$JAVA_HOME/bin  
CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar  
export JAVA_HOME  CLASSPATH  PATH


export HADOOP_HOME=/usr/hadoop/hadoop-2.9.1
export PATH=$PATH:$HADOOP_HOME/bin



<property>
   <name>dfs.name.dir</name>
   <value>/root/hadoop/dfs/name</value>
   <description>Path on the local filesystem where theNameNode stores the namespace and transactions logs persistently.</description>
</property>
<property>
   <name>dfs.data.dir</name>
   <value>/root/hadoop/dfs/data</value>
   <description>Comma separated list of paths on the localfilesystem of a DataNode where it should store its blocks.</description>
</property>
<property>
   <name>dfs.replication</name>
   <value>2</value>
</property>
<property>
      <name>dfs.permissions</name>
      <value>false</value>
      <description>need not permissions</description>
</property>


cp   /opt/hadoop/hadoop-2.9.1/etc/hadoop/mapred-site.xml.template     /opt/hadoop/hadoop-2.9.1/etc/hadoop/mapred-site.xml

vi mapred-site.xml

<property>
   <name>mapred.job.tracker</name>
   <value>hadoop01:49001</value>
</property>
<property>
      <name>mapred.local.dir</name>
       <value>/root/hadoop/var</value>
</property>
<property>
       <name>mapreduce.framework.name</name>
       <value>yarn</value>
</property>


<property>
        <name>yarn.resourcemanager.hostname</name>
        <value>hadoop01</value>
   </property>
   <property>
        <description>The address of the applications manager interface in the RM.</description>
        <name>yarn.resourcemanager.address</name>
        <value>${yarn.resourcemanager.hostname}:8032</value>
   </property>
   <property>
        <description>The address of the scheduler interface.</description>
        <name>yarn.resourcemanager.scheduler.address</name>
        <value>${yarn.resourcemanager.hostname}:8030</value>
   </property>
   <property>
        <description>The http address of the RM web application.</description>
        <name>yarn.resourcemanager.webapp.address</name>
        <value>${yarn.resourcemanager.hostname}:8088</value>
   </property>
   <property>
        <description>The https adddress of the RM web application.</description>
        <name>yarn.resourcemanager.webapp.https.address</name>
        <value>${yarn.resourcemanager.hostname}:8090</value>
   </property>
   <property>
        <name>yarn.resourcemanager.resource-tracker.address</name>
        <value>${yarn.resourcemanager.hostname}:8031</value>
   </property>
   <property>
        <description>The address of the RM admin interface.</description>
        <name>yarn.resourcemanager.admin.address</name>
        <value>${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>
        <discription>每个节点可用内存,单位MB,默认8182MB</discription>
   </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>