Hadoop步骤 openSUSE 42

1. ssh 无密码登录

cd ~/.ssh

ssh-keygen -t rsa  

cat id_rsa.pub >> authorized_keys

本地测试：ssh localhost （第一次需要输入密码，以后不用输入密码）

异机测试：将本机id_rsa.pub（公钥）放到异机的authorized_keys即可

2.jdk 配置

vi  /etc/profile

export JAVA_HOME=/usr/java/jdk1.7.0_79
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
export PATH=$JAVA_HOME/bin:$PATH

source /etc/profile (注意使用的用户，source 使本用户环境有效~~)

3.安装Hadoop

1. sudo tar-zxf ~/下载/hadoop-2.6.0.tar.gz -C /usr/local# 解压到/usr/local中
2. cd/usr/local/
3. sudo mv./hadoop-2.6.0/ ./hadoop# 将文件夹名改为hadoop
4. sudo chown-R hadoop ./hadoop# 修改文件权限

安装完成

测试：

1. cd/usr/local/hadoop
2. ./bin/hadoop version

1. 
   

4. 以下是Hadoop的配置（伪分布式）

./etc/hadoop/core-site.xml 绝对路径是/usr/local/hadoop/etc/hadoop/core-site.xml 不要搞错嘞~~

修改配置文件 core-site.xml 

1. <configuration>
2. <property>
3. <name>hadoop.tmp.dir</name>
4. <value>file:/usr/local/hadoop/tmp</value>
5. <description>Abase for other temporary directories.</description>
6. </property>
7. <property>
8. <name>fs.defaultFS</name>
9. <value>hdfs://localhost:9000</value>
10. </property>
11. </configuration>

修改配置文件 hdfs-site.xml

1. <configuration>
2. <property>
3. <name>dfs.replication</name>
4. <value>1</value>
5. </property>
6. <property>
7. <name>dfs.namenode.name.dir</name>
8. <value>file:/usr/local/hadoop/tmp/dfs/name</value>
9. </property>
10. <property>
11. <name>dfs.datanode.data.dir</name>
12. <value>file:/usr/local/hadoop/tmp/dfs/data</value>
13. </property>
14. </configuration>

注意：如果没有的文件夹，需要新建，比如/usr/local/hadoop/tmp 、 dfs  、name 、data

配置完成后，执行 NameNode 的格式化:

1. ./bin/hdfs namenode -format
2. 
   

   Q1: 

Hadoop格式化HDFS报警告 java.net.UnknownHostException: bogon: bogon

   解决方案：重启虚拟机，bogon是DNS逆解析失败导致的bogon，重启后执行 namenode 格式化命令，如果还不能解决；

   则 vi /etc/hostname  改成slave02 ;vi /etc/hosts 添加127.0.0.1       slave02 重启虚拟机~（Slave02 是自己取得名字）

关键信息如下：

17/01/05 14:33:41 INFO namenode.FSImage: Allocated new BlockPoolId: BP-627974405-127.0.0.1-1483598021204
17/01/05 14:33:41 INFO common.Storage: Storage directory /usr/local/hadoop/tmp/dfs/name has been successfully formatted.
17/01/05 14:33:41 INFO namenode.NNStorageRetentionManager: Going to retain 1 images with txid >= 0
17/01/05 14:33:41 INFO util.ExitUtil: Exiting with status 0
17/01/05 14:33:41 INFO namenode.NameNode: SHUTDOWN_MSG: 
/************************************************************
SHUTDOWN_MSG: Shutting down NameNode at slave02/127.0.0.1
************************************************************/

成功了吧~~

格式化完成，下一步启动Hadoop：

开启 NameNode 和 DataNode 守护进程（启动前要保证ssh服务是开着滴，命令service sshd start）

1. ./sbin/start-dfs.sh

启动成功：

hadoop@slave02:/usr/local/hadoop> jps
2641 DataNode
2838 SecondaryNameNode
2536 NameNode
5853 Jps
hadoop@slave02:/usr/local/hadoop> 

果然成功~

5.以下是Hadoop配置（分布式集群）

一主两从，即一个master两个slave

1) 配置文件：/etc/hadoop/core-site.xml

<configuration>
        <property>
             <name>hadoop.tmp.dir</name>
             <value>file:/usr/local/hadoop/tmp</value>
             <description>Abase for other temporary directories.</description>
        </property>
        <property>
             <name>fs.defaultFS</name>
             <value>hdfs://master:9000</value>
        </property>
</configuration>

2) 配置文件：/etc/hadoop/mapred-site.xml     

<configuration>
<property>
<name>mapred.job.tracker</name>
<value>master:9001</value>
</property>

</configuration>

3) 配置文件：/etc/hadoop/hdfs-site.xml

<configuration>
<property>
             <name>dfs.replication</name>
             <value>1</value>
        </property>
        <property>
             <name>dfs.namenode.name.dir</name>
             <value>file:/usr/local/hadoop/tmp/dfs/name</value>
        </property>
        <property>
             <name>dfs.datanode.data.dir</name>
             <value>file:/usr/local/hadoop/tmp/dfs/data</value>
        </property>
</configuration>

4) 配置masters和slaves主从结点

etc/hadoop/ 目录下没有masters文件夹，不需要配置，只配置Slaves节点

$vim slaves：

输入：

slave01

slave02

5) 配置/etc/hosts

需要root权限哟~

->#vi /etc/hosts

#127.0.0.1      localhost
192.168.126.137 master
192.168.126.138 slave01
192.168.126.136 slave02 

实际IP自己更改~

6) 复制虚拟机，复制2份，一共三个虚拟机，master slave01 slave02

更改三台机器的主机名：vi /etc/hostname 分别为master slave01 slave02

重新设置ssh 免密码登录，使master 能免密码登录master slave01 slave02（如果能登录，就不用重配了~~）

验证完成master能登录master slave01 slave02

7）启动hadoop，

hadoop@master:/usr/local/hadoop> ./sbin/start-dfs.sh 
Starting namenodes on [master]
master: starting namenode, logging to /usr/local/hadoop/logs/hadoop-hadoop-namenode-master.out
slave01: starting datanode, logging to /usr/local/hadoop/logs/hadoop-hadoop-datanode-slave01.out
slave02: starting datanode, logging to /usr/local/hadoop/logs/hadoop-hadoop-datanode-slave02.out
Starting secondary namenodes [0.0.0.0]
0.0.0.0: starting secondarynamenode, logging to /usr/local/hadoop/logs/hadoop-hadoop-secondarynamenode-master.out

jps一下看看：

hadoop@master:/usr/local/hadoop> jps
3419 Jps
3116 NameNode
3311 SecondaryNameNode

去slave01 jps 看看：

hadoop@slave01:~> jps
3278 Jps
3185 DataNode

去slave02 jps 看看：

hadoop@slave02:~> jps
2355 DataNode
2457 Jps

启动成功了~~好消息。

打开浏览器，去master：50070看看吧~

启动管理进程噻~

hadoop@master:/usr/local/hadoop> ./sbin/start-yarn.sh 
starting yarn daemons
starting resourcemanager, logging to /usr/local/hadoop/logs/yarn-hadoop-resourcemanager-master.out
slave01: starting nodemanager, logging to /usr/local/hadoop/logs/yarn-hadoop-nodemanager-slave01.out
slave02: starting nodemanager, logging to /usr/local/hadoop/logs/yarn-hadoop-nodemanager-slave02.out
hadoop@master:/usr/local/hadoop> jps
3116 NameNode
3785 ResourceManager
3311 SecondaryNameNode
3920 Jps