保持linux联网状态。
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设置操作系统环境
1.设置ip地址vim
右键主机名——》设为桥接模式
右键右上方的小电脑》edit connection->ipv4settingst
1)通过centos桌面操作
使用命令ifconfig查看ip地址
当修改了ip之后，使用命令service network restart重新启动网络服务
vi /etc/sysconfig/network-scripts/ifcfg-eth0
2.设置主机名
hostname查看主机名称
1）vi /etc/sysconfig/network,将hostname的值改成想要修改的名字
2）vi /etc/hosts 将第一行的localhost.localdomain改成想要设置的名字
3）reboot重启
绑定主机名到ip上
vi /etc/hosts增加一行记录192.168.1.97 crxy97
错误unknow host ：hadoop1之类的原因在于主机名hadoop1没有绑定到ip上面
3.关闭防火墙
service iptables stop
service iptables status查看状态
4.关闭防火墙的自启动功能
chkconfig --list |grep iptables
chkconfig iptables off
[root@mjc70 /]# chkconfig --list |grep iptables
iptables 0:off1:off 2:on3:on 4:on5:on 6:off
[root@mjc70 /]# chkconfig iptables off
5.设置SSH免密码登录
[root@mjc70 /]# ssh localhost
The authenticity of host 'localhost (::1)' can't be established.
RSA key fingerprint is 6b:0d:4d:69:33:11:09:86:60:cc:ff:7d:b9:b9:74:77.
Are you sure you want to continue connecting (yes/no)?
Host key verification failed.
[root@mjc70 /]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /root/.ssh/id_rsa.
Your public key has been saved in /root/.ssh/id_rsa.pub.
The key fingerprint is:
40:6a:0d:29:2f:ac:36:30:59:9c:31:69:a7:81:84:ef root@mjc70
The key's randomart image is:
+--[ RSA 2048]----+
|o+o+... |
|o O.o= |
| * *o o |
|+ =.. . |
|.+ . S |
|.oE |
|. . |
| |
| |
+-----------------+
[root@mjc70 /]# ll -a
[root@mjc70 ~]# ll .ssh
[root@mjc70 .ssh]# cd
[root@mjc70 ~]# ll .ssh
total 8
-rw-------. 1 root root 1675 Oct 17 23:09 id_rsa
-rw-r--r--. 1 root root 392 Oct 17 23:09 id_rsa.pub
[root@mjc70 ~]# ssh-copy-id localhost （别忘记输入yes）
密码为安装密码
[root@mjc70 ~]# cd
[root@mjc70 ~]# ll .ssh（之前8项现在16）
[root@mjc70 ~]# cd .ssh
[root@mjc70 .ssh]# more id_rsa.pub
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEA9zyhSiWLZYBwngLr+v5Bf9QrhQsYvahiZMWuEt/nkio3TD8qSlljyoBgt3aSKFyuP4
xFBI8reVSpL/Y8aUbIG0rVdr+VM3a0mHMMse0FLn3+ahEQozBrlQ8FSUIBn6ksAPgBGheELsyaOEkvgh4iRUX0zpPkg+eybCvhxR0P
oot@mjc70
[root@mjc70 .ssh]# ssh localhost
Last login: Sat Oct 17 22:18:44 2015 from 192.168.1.141
6.安装jdk
把jdk-7u79-linux-x64.tar.gz放到linux的/usr/local（先把local里的东西删掉）目录下
执行命令tar -zxvf jdk-7u79-linux-x64.tar.gz解压缩
执行命令vi /etc/profile 增加两行内容，分别是
export JAVA_HOME=/usr/local/jdk1.7.0_79
export PATH=.:$JAVA_HOME/bin:$PATH
保存退出。执行命令source /etc/profile
执行命令java -version查看刚才操作是否生效。
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HDFS伪分布搭建
1）修改配置文件etc/hadoop/hadoop-env.sh:
JAVA_HOME=/usr/local/jdk1.7.0_79
2）修改配置文件etc/hadoop/core-site.xml:
<configuration>
<property>
<name>fs.defaultFS</name>
<value>hdfs://192.168.1.97:9000</value>
</property>
<property>
<name>hadoop.tmp.dir</name>
<value>/usr/local/hadoop-2.6.0-64/tmp</value>
</property>
<property>
<name>fs.trash.interval</name>
<value>1440</value>
</property>
</configuration>
3）mapred-site.xml.template
改名为mapred-site.xml
4）修改配置文件etc/hadoop/hdfs-site.xml:
<configuration>
<property>
<name>dfs.replication</name>
<value>1</value>
</property>
<property>
<name>dfs.permissions</name>
<value>false</value>
</property>
</configuration>
格式化文件系统:
$ bin/hdfs namenode -format
（hadoop下的bin
[root@mjc70 bin]# cd /usr
[root@mjc70 usr]# cd local
[root@mjc70 local]# ll
一直cd到bin）
启动HDFS集群:
$ sbin/start-dfs.sh
访问web浏览器:
NameNode - http://localhost:50070/
练习：
创建目录:
$ bin/hdfs dfs -mkdir /user
$ bin/hdfs dfs -mkdir /user/root
复制文件:cd
$ bin/hdfs dfs -put /etc/profile input
关闭集群:
$ sbin/stop-dfs.sh
安装Yarn
修改配置文件etc/hadoop/mapred-site.xml:
<configuration>
<property>
<name>mapreduce.framework.name</name>
<value>yarn</value>
</property>
</configuration>
修改配置文件etc/hadoop/yarn-site.xml:
<configuration>
<property>
<name>yarn.nodemanager.aux-services</name>
<value>mapreduce_shuffle</value>
</property>
</configuration>
启动Yarn集群:
$ sbin/start-yarn.sh
访问web浏览器:
ResourceManager - http://localhost:8088/
运行例子:
$ bin/hadoop jar share/hadoop/mapreduce/hadoop-mapreduce-examples-2.6.0.jar wordcount input output
查看结果：
$ bin/hdfs dfs -cat output/*
关闭Yarn集群:
$ sbin/stop-yarn.sh