linux下安装hadoop

在hadoop安装（解压）目录下

查看的Hadoop的版本: bin/下 hadoop version

java环境

export JAVA_HOME=/opt/user/java/jdk8
export PATH=$PATH:$JAVA_HOME/bin:$HADOOP_HOME/bin
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export HADOOP_HOME=/opt/user/hadoop/hadoop

1.vim $HADOOP_HOME/etc/hadoop/hadoop-env.sh

添加 export JAVA_HOME=/usr/local/software/jdk1.8.0_111

2.vim $HADOOP_HOME/etc/hadoop/core-site.xml

<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://localhost:9000</value>
</property>
</configuration>

3. vim $HADOOP_HOME/etc/hadoop/hdfs-site.xml

<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>
4.vim $HADOOP_HOME/etc/hadoop/yarn-site.xml

<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce.shuffle</value>
</property>
</configuration>

第一次启动时要初始化，格式化的NameNode

初始化hadoop,bin/：./hdfs namenode –format

sbin/: ./start-all.sh

[root@localhost hadoop]# cd sbin
[root@localhost sbin]# ./start-all.sh
This script is Deprecated. Instead use start-dfs.sh and start-yarn.sh
Starting namenodes on [localhost]
root@localhost's password: 
localhost: starting namenode, logging to /opt/user/hadoop/hadoop/logs/hadoop-root-namenode-localhost.localdomain.out
root@localhost's password: 
localhost: starting datanode, logging to /opt/user/hadoop/hadoop/logs/hadoop-root-datanode-localhost.localdomain.out
Starting secondary namenodes [0.0.0.0]
[email protected]'s password: 
0.0.0.0: starting secondarynamenode, logging to /opt/user/hadoop/hadoop/logs/hadoop-root-secondarynamenode-localhost.localdomain.out
starting yarn daemons
starting resourcemanager, logging to /opt/user/hadoop/hadoop/logs/yarn-guest-resourcemanager-localhost.localdomain.out
root@localhost's password: 
localhost: starting nodemanager, logging to /opt/user/hadoop/hadoop/logs/yarn-root-nodemanager-localhost.localdomain.out
[root@localhost sbin]#

CentOS 7.0默认使用的是firewall作为防火墙

查看防火墙状态