配置集群方案
Ubuntu下的配置apache虚拟主机方案:
对其中的Master节点配置虚拟主机，可以通过Chrome浏览器访问目录。
安装虚拟主机之前，先安装Apache2
sudo apt-get install apache2
再安装php5
sudo apt-get install php5
然后，进入 /etc/apache2/sites-available文件夹，添加”*.conf”文件
往该文件里写入
<VirtualHost *:>
ServerName author.xxx.com
ServerAdmin author.xxx.com
DocumentRoot "/home/author"
<Directory "/home/author">
Options Indexes
AllowOverride all
Order allow,deny
IndexOptions Charset=UTF-
Allow from all
Require all granted
</Directory>
<ifModule dir_module>
DirectoryIndex index.html
</ifModule>
ErrorLog ${APACHE_LOG_DIR}/authors_errors.log
CustomLog ${APACHE_LOG_DIR}/authors_access.log combined
</VirtualHost>
这样的结果是，当Url中访问author.xxx.com时，是有文件夹的树状列表显示的。如果想关掉树状列表显示(为了安全)，可以将
Options Indexes
IndexOptions Charset=UTF-
改成
Options FollowSymLinks
这边
paul_errors.log paul_access.log
都位于 /usr/log/apache2中，可以查看apache的日志，用root权限。
配置文件完成之后，则设置的配置文件运行以下命令：
sudo a2ensite xxx.conf
sudo /etc/init.d/apache2 restart
mac下的配置apache虚拟主机方案:
前面基本一致，除了重新启动配置文件不同:
sudo apachectl -v //查看apache版本
sudo apachectl -t //查看虚拟文件配置是否语法正确
sudo apachectl -k restart //重新启动Apache
hadoop部署集群碰到问题(版本为2.7及以上)
该搭建集群具体参数参考本主上一篇文章“机房4台服务器集群网络配置"
在Master上执行下列查看语句之后，出现如下错误
hdfs dfsadmin -report
Configured Capacity: ( B)
Present Capacity: ( B)
DFS Remaining: ( B)
DFS Used: ( B)
DFS Used%: NaN%
Under replicated blocks:
Blocks with corrupt replicas:
Missing blocks:
Missing blocks (with replication factor ):
所有值都为0，且得不到其他slave1,slave2,slave3的反馈消息。
解决方法：
mkdir /home/hadoop/usr/hadoop/conf
新建配置文件夹
文件夹下放入以下配置文件
core-site.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/hadoop/tmp</value>
<description>A base for other temporary directories.</description>
</property>
<!--file system properties-->
<property>
<name>fs.default.name</name>
<value>hdfs://192.168.223.1:9000</value>
</property>
</configuration>
hdfs-site.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
</configuration>
mapred-site.xml(老版本下job,task配置)
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>http://192.168.223.1:9001</value>
</property>
</configuration>
mapred-site.xml(使用hadoop2.2之后的配置)
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>
yarn-site.xml(Master下的配置文件)
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<property>
<name>yarn.resourcemanager.hostname</name>
<value>resourcemanager.company.com</value>
</property>
<property>
<description>Classpath for typical applications.</description>
<name>yarn.application.classpath</name>
<value>
$HADOOP_CONF_DIR,
$HADOOP_COMMON_HOME/*,$HADOOP_COMMON_HOME/lib*/,
$HADOOP_HDFS_HOME/*,$HADOOP_HDFS_HOME/lib/*,
$HADOOP_MAPRED_HOME/*,$HADOOP_MAPRED_HOME/lib/*,
$HADOOP_YARN_HOME/*,$HADOOP_YARN_HOME/lib/*
</value>
</property>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
<property>
<name>yarn.nodemanager.local-dirs</name>
<value>file:///data/1/yarn/local,file:///data/2/yarn/local,file:///data/3/yarn/local</value>
</property>
<property>
<name>yarn.nodemanager.log-dirs</name>
<value>file:///data/1/yarn/logs,file:///data/2/yarn/logs,file:///data/3/yarn/logs</value>
</property>
<property>
<name>yarn.log.aggregation-enable</name>
<value>true</value>
</property>
<property>
<description>Where to aggregate logs</description>
<name>yarn.nodemanager.remote-app-log-dir</name>
<value>hdfs://<namenode-host.company.com>:8020/var/log/hadoop-yarn/apps</value>
</property><!-- Site specific YARN configuration properties --></configuration>
为了配合yarn-site.xml中的配置，需要配置
- 创建 yarn.nodemanager.local-dirs 本地目录：
$ sudo mkdir -p /data//yarn/local /data//yarn/local /data//yarn/local /data//yarn/local
- 创建 yarn.nodemanager.log-dirs 本地目录：
$ sudo mkdir -p /data//yarn/logs /data//yarn/logs /data//yarn/logs /data//yarn/logs
-
将 yarn.nodemanager.local-dirs 目录的所有者配置为 hadoop 用户：
$ sudo chown -R hadoop:hadoop /data//yarn/local /data//yarn/local /data//yarn/local /data//yarn/local
-
将 yarn.nodemanager.log-dirs 目录的所有者配置为 hadoop 用户：
$ sudo chown -R hadoop:hadoop /data//yarn/logs /data//yarn/logs /data//yarn/logs /data//yarn/logs
yarn-site.xml在slave中的配置,用于与master节点通信，所以IP与端口号都是master节点的:
<?xml version="1.0"?>
<configuration>
<property>
<name>
yarn.nodemanager.aux-services
</name>
<value>
mapreduce_shuffle
</value>
</property>
<property>
<name>
yarn.nodemanager.auxservices.mapreduce.shuffle.class
</name>
<value>
org.apache.hadoop.mapred.ShuffleHandler
</value>
</property>
<property>
<name>
yarn.resourcemanager.address
</name>
<value>
192.168.223.1:8032
</value>
</property>
<property>
<name>
yarn.resourcemanager.scheduler.address
</name>
<value>
192.168.223.1:8030
</value>
</property>
<property>
<name>
yarn.resourcemanager.resource-tracker.address
</name>
<value>
192.168.223.1:8031
</value>
</property>
<property>
<name>
yarn.resourcemanager.hostname
</name>
<value>
192.168.223.1
</value>
</property>
<!-- Site specific YARN configuration properties -->
</configuration>
master
192.168.223.1
slaves(在master节点上的配置文件相应ip地方换上以下相应的ip)
192.168.223.2
192.168.223.3
192.168.223.4
slaves(在slave节点上的配置文件)
localhost
启动方法如下：
hadoop@master:/usr/hadoop$hadoop namenode -format
hadoop@master:/usr/hadoop$sbin/start-all.sh(如果已经启动，则先运行sbin/stop-all.sh)
查看方法(执行以下命令)
hadoop@master:/usr/hadoop$hdfs dfsadmin -report
得到如下结果，则表示安装正确
Configured Capacity: (4.51 TB)
Present Capacity: (4.27 TB)
DFS Remaining: (4.27 TB)
DFS Used: ( KB)
DFS Used%: 0.00%
Under replicated blocks:
Blocks with corrupt replicas:
Missing blocks:
Missing blocks (with replication factor ): -------------------------------------------------
Live datanodes (): Name: 192.168.223.3: (slave3)
Hostname: slave3
Decommission Status : Normal
Configured Capacity: (1.54 TB)
DFS Used: ( KB)
Non DFS Used: (82.39 GB)
DFS Remaining: (1.46 TB)
DFS Used%: 0.00%
DFS Remaining%: 94.79%
Configured Cache Capacity: ( B)
Cache Used: ( B)
Cache Remaining: ( B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers:
Last contact: Sat Nov :: CST Name: 192.168.223.2: (slave2)
Hostname: slave2
Decommission Status : Normal
Configured Capacity: (1.54 TB)
DFS Used: ( KB)
Non DFS Used: (82.40 GB)
DFS Remaining: (1.46 TB)
DFS Used%: 0.00%
DFS Remaining%: 94.79%
Configured Cache Capacity: ( B)
Cache Used: ( B)
Cache Remaining: ( B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers:
Last contact: Sat Nov :: CST Name: 192.168.223.4: (slave4)
Hostname: slave4
Decommission Status : Normal
Configured Capacity: (1.42 TB)
DFS Used: ( KB)
Non DFS Used: (76.00 GB)
DFS Remaining: (1.35 TB)
DFS Used%: 0.00%
DFS Remaining%: 94.78%
Configured Cache Capacity: ( B)
Cache Used: ( B)
Cache Remaining: ( B)
Cache Used%: 100.00%
Cache Remaining%: 0.00%
Xceivers:
Last contact: Sat Nov :: CST
创建HDFS文件系统的命令
hadoop fs -mkdir -p /user/[current login user]
创建完HDFS文件系统用户之后，你就可以访问HDFS文件系统，具体对HDFS分布式文件系统的命令请参考以下网址
网页访问hadoop当前性能
http://10.1.8.200:50070/(这边的ip为外网访问master节点的ip，读者自己设置自己的ip)
如下图所示：
具体安装则参考网址