Author Archives: neohope

1、新建文件夹

bin/hadoop fs -ls /
bin/hadoop fs -mkdir /usr
bin/hadoop fs -mkdir /usr/neohope
bin/hadoop fs -mkdir /usr/neohope/test

2、从本地拷贝文件到hdfs

mkdir ~/test
echo hello hadoop >> ~/test/hello.txt
bin/hadoop fs -put ~/test/hello.txt /usr/neohope/test/

3、查看远程文件

bin/hadoop fs -ls /usr/neohope/test
bin/hadoop fs -cat /usr/neohope/test/hello.txt

4、从hdfs拷贝文件到本地

bin/hadoop fs -get /usr/neohope/test/hello.txt ~/test/hello1.txt
cat ~/test/hello1.txt

5、语法说明

hadoop@hadoop-master:~/hadoop-2.7.1$ bin/hadoop fs
Usage: hadoop fs [generic options]
	[-appendToFile <localsrc> ... <dst>]
	[-cat [-ignoreCrc] <src> ...]
	[-checksum <src> ...]
	[-chgrp [-R] GROUP PATH...]
	[-chmod [-R] <MODE[,MODE]... | OCTALMODE> PATH...]
	[-chown [-R] [OWNER][:[GROUP]] PATH...]
	[-copyFromLocal [-f] [-p] [-l] <localsrc> ... <dst>]
	[-copyToLocal [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
	[-count [-q] [-h] <path> ...]
	[-cp [-f] [-p | -p[topax]] <src> ... <dst>]
	[-createSnapshot <snapshotDir> [<snapshotName>]]
	[-deleteSnapshot <snapshotDir> <snapshotName>]
	[-df [-h] [<path> ...]]
	[-du [-s] [-h] <path> ...]
	[-expunge]
	[-find <path> ... <expression> ...]
	[-get [-p] [-ignoreCrc] [-crc] <src> ... <localdst>]
	[-getfacl [-R] <path>]
	[-getfattr [-R] {-n name | -d} [-e en] <path>]
	[-getmerge [-nl] <src> <localdst>]
	[-help [cmd ...]]
	[-ls [-d] [-h] [-R] [<path> ...]]
	[-mkdir [-p] <path> ...]
	[-moveFromLocal <localsrc> ... <dst>]
	[-moveToLocal <src> <localdst>]
	[-mv <src> ... <dst>]
	[-put [-f] [-p] [-l] <localsrc> ... <dst>]
	[-renameSnapshot <snapshotDir> <oldName> <newName>]
	[-rm [-f] [-r|-R] [-skipTrash] <src> ...]
	[-rmdir [--ignore-fail-on-non-empty] <dir> ...]
	[-setfacl [-R] [{-b|-k} {-m|-x <acl_spec>} <path>]|[--set <acl_spec> <path>]]
	[-setfattr {-n name [-v value] | -x name} <path>]
	[-setrep [-R] [-w] <rep> <path> ...]
	[-stat [format] <path> ...]
	[-tail [-f] <file>]
	[-test -[defsz] <path>]
	[-text [-ignoreCrc] <src> ...]
	[-touchz <path> ...]
	[-truncate [-w] <length> <path> ...]
	[-usage [cmd ...]]

Generic options supported are
-conf <configuration file>     specify an application configuration file
-D <property=value>            use value for given property
-fs <local|namenode:port>      specify a namenode
-jt <local|resourcemanager:port>    specify a ResourceManager
-files <comma separated list of files>    specify comma separated files to be copied to the map reduce cluster
-libjars <comma separated list of jars>    specify comma separated jar files to include in the classpath.
-archives <comma separated list of archives>    specify comma separated archives to be unarchived on the compute machines.

The general command line syntax is
bin/hadoop command [genericOptions] [commandOptions]

1、将hadoop解压

su hadoop
cd ~
tar -zxvf /home/neohope/Desktop/hadoop-2.7.1.tar.gz

2、修改/home/hadoop/hadoop-2.7.1/etc/hadoop/路径下配置
2.1、core-site.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>

  <property>
    <name>fs.defaultFS</name>
    <value>hdfs://hadoop-master:9000</value>
  </property>

  <property>
    <name>fs.default.name</name>
    <value>hdfs://hadoop-master:9000</value>
  </property>

  <property>
    <name>hadoop.tmp.dir</name>
    <value>file:/home/hadoop/hadoop-2.7.1/tmp</value>
  </property>

  <property>
    <name>io.file.buffer.size</name>
    <value>131702</value>
  </property>

</configuration>

2.2、hdfs-site.xml

<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>
  <property>
    <name>dfs.namenode.name.dir</name>
    <value>file:/home/hadoop/hadoop-2.7.1/hdfs/name</value>
  </property>


  <property>
    <name>dfs.datanode.data.dir</name>
    <value>file:/home/hadoop/hadoop-2.7.1/hdfs/data</value>
  </property>


  <property>
    <name>dfs.replication</name>
    <value>3</value>
  </property>


  <property>
    <name>dfs.namenode.secondary.http-address</name>
    <value>hadoop-master:9001</value>
  </property>


  <property>
    <name>dfs.webhdfs.enabled</name>
    <value>true</value>
  </property>

</configuration>

2.3、mapred-site.xml

<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>

<!-- Put site-specific property overrides in this file. -->

<configuration>

  <property>
    <name>mapreduce.framework.name</name>
    <value>yarn</value>
  </property>

  <property>
    <name>mapreduce.jobhistory.address</name>
    <value>hadoop-master:10020</value>
  </property>

  <property>
    <name>mapreduce.jobhistory.webapp.address</name>
    <value>hadoop-master:19888</value>
  </property>

  <property>
    <name>mapreduce.map.memory.mb</name>
    <value>2048</value>      
  </property>

  <property>
    <name>mapreduce.reduce.memory.mb</name>
    <value>2048</value>      
  </property>

</configuration>

2.4、yarn-site.xml

<?xml version="1.0"?>

<!-- Site specific YARN configuration properties -->

<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>hadoop-master:8032</value>
  </property>

  <property>
    <name>yarn.resourcemanager.scheduler.address</name>
    <value>hadoop-master:8030</value>
  </property>

  <property>
    <name>yarn.resourcemanager.resource-ticker.address</name>
    <value>hadoop-master:8031</value>
  </property>

  <property>
    <name>yarn.resourcemanager.admin.address</name>
    <value>hadoop-master:8033</value>
  </property>

  <property>
    <name>yarn.resourcemanager.webapp.address</name>
    <value>hadoop-master:8088</value>
  </property>

  <property>
    <name>yarn.resourcemanager.resource.memory-mb</name>
    <value>2048</value>
  </property>

  <property>
    <name>yarn.nodemanager.resource.memory-mb</name>
    <value>2048</value>
  </property>

</configuration>

2.5、slaves

#localhost
hadoop-slave01
hadoop-slave02

3、修改/home/hadoop/hadoop-2.7.1/etc/hadoop/路径下JAVA路径
3.1、hadoop-env.sh

# The java implementation to use.
#export JAVA_HOME=${JAVA_HOME}
export JAVA_HOME=/usr/java/jdk1.7.0_79

3.2、yarn-env.sh

# some Java parameters
# export JAVA_HOME=/home/y/libexec/jdk1.6.0/
if [ "$JAVA_HOME" != "" ]; then
  #echo "run java in $JAVA_HOME"
  #JAVA_HOME=$JAVA_HOME
  JAVA_HOME=/usr/java/jdk1.7.0_79
fi

4、分发hadoop文件夹到各slave

scp -r /home/hadoop/hadoop-2.7.1 hadoop@hadoop-slave01:~/
scp -r /home/hadoop/hadoop-2.7.1 hadoop@hadoop-slave02:~/

5、初始化主服务器

cd ~/hadoop-2.7.1
bin/hdfs namenode -format

6、启动hadoop

cd ~/hadoop-2.7.1
sbin/start-dfs.sh
sbin/start-yarn.sh

7、查看hadoop进程信息

/usr/java/jdk1.7.0_79/bin/jps

8、查看cluster信息

http://10.10.10.3:8088

9、查看hdfs文件系统信息

http://10.10.10.3:50070

10、Hadoop常用端口如下

1、环境准备

VMWare8
Debian6
JDK7
Hadoop2.7.1（这个是第一次部署时用的版本）
*如果要看后续文章，建议使用（hadoop-2.5.2  hbase-1.1.2  hive-1.2.1  spark-2.0.0）

2、安装虚拟机，安装VMTools

su
apt-get install gcc
apt-get install linux-headers-$(uname -r)
apt-get install build-essential
./vmware-install.pl

设置共享目录，将需要的文件拷贝到虚拟机。
当然也可以设置好虚拟的的ssh后，用scp或winscp将文件拷贝到虚拟机。

3.网络配置为NAT，网卡设置为dhcp
修改配置文件/etc/network/interfaces

auto lo
iface lo inet loopback

auto eth0
iface eth0 inet dhcp

根据需要（一般用不到），修改配置文件/etc/resolv.conf

nameserver xxx.xxx.xxx.xxx

重启网卡

su
ifconfig eth0 down
ifconfig eth0 up

3、安装hadoop需要的软件

su
apt-get install openssh-server
apt-get install ssh
apt-get install rsync
mkdir /usr/java
cd /usr/java
tar -zxvf /home/neohope/Desktop/jdk-7u79-linux-x64.gz

4、新建用户hadoop

sudo adduser hadoop -home /home/hadoop

5、设置环境变量
修改文件/etc/profile，增加下面的内容

export JAVA_HOME=/usr/java/jdk1.7.0_79
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JRE_HOME/lib:$CLASSPATH
export PATH=$JAVA_HOME/bin:$PATH

export HADOOP_HOME=/home/hadoop/hadoop-2.7.1
export PATH=$PATH:$HADOOP_HOME/lib

测试一下

source /etc/profile
cd $JAVA_HOME
echo $HADOOP_HOME

5、切换到用户hadoop，并实现ssh免密码认证
5.1RSA方式

#Ubuntu16.04以后，默认不支持dsa
#rsa证书生成
su hadoop
ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
ssh localhost

5.2DSA方式

#Ubuntu16.04以后，默认不支持dsa，要手工开启dsa支持
#编辑文件
sudo vi /etc/ssh/sshd_config
#添加下面几行
PermitRootLogin no
PermitEmptyPasswords no
PasswordAuthentication yes
PubkeyAuthentication yes
ChallengeResponseAuthentication no
PubkeyAcceptedKeyTypes=+ssh-dss

#重启sshd
systemctl reload sshd

#dsa证书生成
su hadoop
ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys
ssh localhost

6、拷贝两份虚拟机，设置这三个虚拟机的名称及固定ip（NAT），修改后配置为

以hadoop-master为例，其配置为

#/etc/network/interfaes
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet static
address 10.10.10.3
netmask 255.0.0.0
gateway 10.10.10.2
#dns-nameservers 114.114.114.114

#/etc/hosts
127.0.0.1	localhost
10.10.10.3	hadoop-master
10.10.10.4	hadoop-slave01
10.10.10.5	hadoop-slave02

#/etc/hostname
hadoop-master

7、三台虚拟机都开启后，就可以相互用ssh直接访问了

su hadoop
ssh hadoop-master
ssh hadoop-slave01
ssh hadoop-slave02

8、Hadoop要求的ssh免密码登录范围(IP和主机名)：
1) NameNode能免密码登录所有的DataNode
2) SecondaryNameNode能免密码登录所有的DataNode
3) NameNode能免密码登录自己
4) SecondaryNameNode能免密码登录自己
5) NameNode能免密码登录SecondaryNameNode
6) SecondaryNameNode能免密码登录NameNode
7) DataNode能免密码登录自己
8) DataNode不需要配置免密码登录NameNode、SecondaryNameNode和其它DataNode