hadoop分布式搭建
1、新建三台机器,分别为:
hadoop分布式搭建至少需要三台机器:
- master
- extension1
- extension2
本文利用在VMware Workstation下安装Linux centOS,安装教程请看:
2、编辑ip
用ifconfig查看本机ip:
[root@master ~]# ifconfig
eno16777736: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.204.128 netmask 255.255.255.0 broadcast 192.168.204.255
inet6 fe80::20c:29ff:fe43:53ea prefixlen 64 scopeid 0x20<link>
ether 00:0c:29:43:53:ea txqueuelen 1000 (Ethernet)
RX packets 86219 bytes 123262936 (117.5 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 22010 bytes 1501252 (1.4 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 0 (Local Loopback)
RX packets 188 bytes 33400 (32.6 KiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 188 bytes 33400 (32.6 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
virbr0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.122.1 netmask 255.255.255.0 broadcast 192.168.122.255
ether 00:00:00:00:00:00 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
extension1
和 extension2
同样如此,可以得到三台机器的ip分别为:
master:192.168.204.128
extension1:192.168.204.129
extension2:192.168.204.130
切换到/etc/hosts修改配置,隔一行在后面加上:
192.168.204.128 master
192.168.204.129 extension1
192.168.204.130 extension2
3、创建SSH密匙
创建密匙命令:
[master@master root]$ ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa
得到样式如下:
extension1
和 extension2
同样操作
切换到密匙文件夹:/home/master/.ssh/
4、复制密匙成新文件
输入命令:
[master@master .ssh]$ cat id_dsa.pub >> authorized_keys
会在当前生成新的文件:
authorized_keys
extension1
和 extension2
同样操作
5、测试密匙
测试密匙能否使用:
- ssh localhost
- yes
- 输入密码
- exit
extension1
和 extension2
同样操作
6、extension复制master密匙
extension复制master密匙达到免密码登陆,在三台机器里面都输入下面命令:
[extension1@extension1 .ssh]$ scp master@master:~/.ssh/id_dsa.pub ./master_dsa.pub
cat master_dsa.pub >> authorized_keys
chmod 600 authorized_keys
extension1
和 extension2
同样操作
7、实现免密匙登陆
master能对master、extension1、extension2免密匙登陆:
ssh master@master
ssh extension1@extension1
ssh extension2@extension2
extension1
和 extension2
同样操作
8、下载解压安装包
查看电脑位数: getconf LONG_BIT
java地址(jdk1.7.0_09x64.tar.gz):
http://pan.baidu.com/s/1hs2uX1q
hadoop地址(hadoop-0.20.2.tar.gz):
http://vdisk.weibo.com/s/zNZl3
新建文件夹:
- 切换到 root
- 新建文件夹: mkdir /usr/program
- 放入安装包
- 解压
解压命令:
tar -zxvf hadoop-0.20.2.tar.gz
tar xvf jdk1.7.0_09x64.tar.gz
extension1
和 extension2
同样操作
9、java环境配置
打开 /etc/profile
配置文件,在最末尾加入:
# set java environment
exportJAVA_HOME=/usr/program/jdk1.7.0_09x64
exportJRE_HOME=/usr/program/jdk1.7.0_09x64/jre
export CLASSPATH=.:$JAVA_HOME/lib:$JAVA_HOME/jre/lib
export PATH=$JAVA_HOME/bin:$JAVA_HOME/jre/bin:$PATH
export PATH=/usr/program/jdk1.7.0_09x64/bin
保存退出后,跟新配置文件,让配置文件生效:
source /etc/profile
查看环境是否配置成功:
java -version
extension1
和 extension2
同样操作
10、hadoop环境配置
创建一个文件夹:
mkdir /usr/program/hadoop-0.20.2/hadooptmp
进入文件夹:
/usr/program/hadoop-0.20.2/conf/
hadoop-env.sh:
export JAVA_HOME=/usr/program/jdk1.7.0_09x64
core-site.xml:
打开文件:
vim core-site.xml
里面的代码改成:
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>fs.default.name</name>
<value>hdfs://master:9000/</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/program/hadoop-0.20.2/hadooptmp</value>
</property>
</configuration>
hdfs-site.xml:
打开文件:
vim hdfs-site.xml
写入以下代码:
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>dfs.replication</name>
<value>2</value>
</property>
<property>
<name>dfs.permissions</name>
<value>false</value>
</property>
</configuration>
mapred-site.xml:
打开文件:
vim mapred-site.xml
写入以下代码:
<?xml version="1.0"?>
<?xml-stylesheet type="text/xsl" href="configuration.xsl"?>
<!-- Put site-specific property overrides in this file. -->
<configuration>
<property>
<name>mapred.job.tracker</name>
<value>master:9001</value>
</property>
</configuration>
extension1
和 extension2
同样操作
11、环境配置
打开文件:
/etc/profile
在最后面加入:
#set hadoop
export HADOOP_HOME=/usr/program/hadoop-0.20.2
export PATH=$HADOOP_HOME/bin:$PATH
使配置文件生效:
source /etc/profile
12、启动hadoop
进入文件夹:
/usr/program/hadoop-0.20.2/bin
格式化namenode:
hadoop namenode -format
打开hadoop:
start-all.sh
输入 jps
:
但是,如果输入口输入 jps
出现:
bash: jps: 未找到命令...
方法一:
查看java目录:
which java
删除这个指引:
rm /bin/java
建立新的指引:
ln -s /usr/program/jdk1.7.0_25/bin/java /bin/java
方法二:
经过排查发现是:
jps
命令是在java解压包中的 /bin/
文件夹里面,是一个可执行文件,但是可以用另一个方法来看是否完成启动:
stop-all.sh
但是用另一个方法查看也行,浏览器输入:
192.168.204.128:50030
浏览器输入:
192.168.204.128:50070
该完成的时候还是会完成的,切记java下载的版本下载为:
- jdk1.8.0_101
- jdk1.7.0_09
- jdk1.6.0_13
- jdk1.7.0_21
oracle地址:
http://www.oracle.com/technetwork/cn/java/javase/downloads/jdk8-downloads-2133151-zhs.html
检查安装的JAVA包:
rpm -qa | grep jdk
卸载相应的包:
yum -y remove java-1.8.0-openjdk-headless.x86_64