hadoop2.7完全分布式安装

安装准备

操作系统: Centos 7
三台机器(hadoop-0为master)：

hadoop-0:192.168.116.130
hadoop-1:192.168.116.131
hadoop-2:192.168.116.132

软件包：

hadoop下载地址:
http://apache.fayea.com/hadoop/common/hadoop-2.7.3/hadoop-2.7.3.tar.gz
java下载地址:
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

配置系统环境

分别在hadoop-0，hadoop-1，hadoop-2上创建用户

$ useradd hadoop
$ passwd hadoop

修改hostname

192.168.116.130主机:
echo “hadoop-0” > /etc/hostname
192.168.116.131主机:
echo “hadoop-1” > /etc/hostname
192.168.116.132主机:
echo “hadoop-2” > /etc/hostname

分别在hadoop-0，hadoop-1，hadoop-2上修改hosts文件:

echo “192.168.116.130 hadoop-0” >>/etc/hosts
echo “192.168.116.131 hadoop-1” >>/etc/hosts
echo “192.168.116.132 hadoop-2” >>/etc/hosts

互ping测试

ping hadoop-0
ping hadoop-1
ping hadoop-2

设置SSH免密码登录(使用hadoop账号登录)

分别在hadoop-0，hadoop-1，hadoop-2上生成公钥

$ ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
$ cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
$ chmod 0600 ~/.ssh/authorized_keys

将三台机器上的 ~/.ssh/id_rsa.pub汇总到同一个authorized_keys文件，并用该文件替换三台机器上的~/.ssh/authorized_keys文件，然后对authorized_keys文件授予0600权限
复制命令：

$ scp ~/.ssh/id_rsa.pub hadoop@hadoop-1:/tmp/authorized_keys
$ mv /tmp/authorized_keys ~/.ssh/

安装JDK

解压安装包:

tar -zxvf jdk-8u101-linux-x64.tar.gz

设置环境变量:

a.编辑profile文件

vi /etc/profile

b.在profile文件最后加上以下代码，JAVA_HOME根据安装路径自行修改

JAVA_HOME=/opt/jdk1.8.0_101
CLASSPATH=.:$JAVA_HOME/lib
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME CLASSPATH PATH

c.使环境变量生效

source /etc/profile

验证:

root@ubuntu:/opt# java -version
java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

安装hadoop

解压 hadoop-2.7.3.tar.gz，并移动到要安装的目录（本例安装目录/opt/hadoop）

$ tar -zxvf hadoop-2.7.3.tar.gz
$ mv /tmp/hadoop-2.7.3 /opt/hadoop

为hadoop用户授权

$ sudo chown -R hadoop:hadoop /opt/hadoop/
$ sudo chmod -R 775 /opt/hadoop/

修改配置文件

以下修改可在一台机器上完成，然后将修改后的hadoop打包发送的另外两台机器

修改hadoop-env.sh文件,修改JAVA_HMOE

# The java implementation to use.
# export JAVA_HOME=${JAVA_HOME}
export JAVA_HOME=/opt/jdk1.8.0_101

修改core-site.xml文件

<configuration>
    <property>
        <name>hadoop.tmp.dirname>
        <value>file:/opt/hadoop/tmpvalue>
        <description>Abase for other temporary directories.description>
    property>
    <property>
        <name>fs.defaultFSname>
        <value>hdfs://hadoop-0:9000value>
    property>
configuration>

修改hdfs-site.xml文件

<configuration>

        <property>
                <name>dfs.namenode.secondary.http-addressname>
                <value>hadoop2:50090value>
        property>
        <property>
                <name>dfs.replicationname>
                <value>2value>
        property>
        <property>
                <name>dfs.namenode.name.dirname>
                <value>file:/opt/hadoop/tmp/dfs/namevalue>
        property>
        <property>
                <name>dfs.datanode.data.dirname>
                <value>file:/opt/hadoop/tmp/dfs/datavalue>
        property>

configuration>

修改yarn-site.xml文件

<configuration>



        <property>
                <name>yarn.resourcemanager.hostnamename>
                <value>hadoop-0value>
        property>
        <property>
                <name>yarn.nodemanager.aux-servicesname>
                <value>mapreduce_shufflevalue>
        property>

configuration>

修改mapred-site.xml文件

<configuration>

        <property>
                <name>mapreduce.framework.namename>
                <value>yarnvalue>
        property>
        <property>
                <name>mapreduce.jobhistory.addressname>
                <value>hadoop-0:10020value>
        property>
        <property>
                <name>mapreduce.jobhistory.webapp.addressname>
                <value>hadoop-0:19888value>
        property>

configuration>

修改slaves文件

hadoop-0
hadoop-1
hadoop-2

发送到另外两台机器

# 复制
$ scp /opt/hadoop root@hadoop-1:/opt/hadoop
$ scp /opt/hadoop root@hadoop-2:/opt/hadoop
# 授权
$ sudo chown -R hadoop:hadoop /opt/hadoop/
$ sudo chmod -R 775 /opt/hadoop/

配置环境变量

export HADOOP_HOME=/opt/hadoop
export HADOOP_INSTALL=$HADOOP_HOME
export HADOOP_MAPRED_HOME=$HADOOP_HOME
export HADOOP_COMMON_HOME=$HADOOP_HOME
export HADOOP_HDFS_HOME=$HADOOP_HOME
export YARN_HOME=$HADOOP_HOME
export HADOOP_COMMON_LIB_NATIVE_DIR=$HADOOP_HOME/lib/native
export PATH=$PATH:$HADOOP_HOME/sbin:$HADOOP_HOME/bin

格式化(只在hadoop-0)

hdfs namenode -format

启动(只在hadoop-0)

start-all.sh

查看进程

$ jps

hadoop-0

115363 Jps
91430 DataNode
92216 NodeManager
91898 ResourceManager
91660 SecondaryNameNode
91263 NameNode

hadoop-1

18760 DataNode
18904 NodeManager
32443 Jps

hadoop-2

16913 Jps
3090 DataNode
3234 NodeManager

然后恭喜,安装完毕.

如果50070和8088页面打不开请检查防火墙

systemctl stop firewalld.service
systemctl disable firewalld.service

网址:
http://hadoop-0:50070/
http://hadoop-0:8088/

其他：
错误：Host key verification failed 解决方法:
http://www.51testing.com/html/38/225738-234384.html