hadoop0.20.2完全分布式环境搭建
三台服务器分别配置IP为：
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192.168.11.131
192.168.11.132
192.168.11.133
分别配置主机名
master：
# hostnamectl set-hostname master
其它两台分别配置为slave1和slave2
各服务器关闭selinux和防火墙：
# vi /etc/sysconfig/selinux
SELINUX=enforcing --> SELINUX=disabled
# setenforce 0
# systemctl stop firewalld
# systemctl disable firewalld
替换yum源：
[root@master ~]# mkdir apps
上传包
wget-1.14-15.el7.x86_64.rpm
[root@master apps]# rpm -ivh wget-1.14-15.el7.x86_64.rpm
[root@master apps]# cd /etc/yum.repos.d/
[root@master yum.repos.d]# wget http://mirrors.aliyun.com/repo/Centos-7.repo
[root@master yum.repos.d]# mv Centos-7.repo CentOS-Base.repo
[root@master yum.repos.d]# scp CentOS-Base.repo root@192.168.11.132:/etc/yum.repos.d/
[root@master yum.repos.d]# scp CentOS-Base.repo root@192.168.11.133:/etc/yum.repos.d/
各服务器执行
# yum clean all
# yum makecache
# yum update
ntp时间同步：
master作为ntp服务端，配置如下
# yum install -y ntp
ntpserver：
master作为ntp主服务器修改时间
# date -s "2018-05-27 23:03:30"
# vi /etc/ntp.conf
在注释下添加两行
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
server 127.127.1.0
fudge 127.127.1.0 stratum 11
注释下面
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
# systemctl start ntpd.service
# systemctl enable ntpd.service
slave1和slave2作为ntp客户端，配置如下
# vi /etc/ntp.conf
同样注释下添加两行
#restrict 192.168.1.0 mask 255.255.255.0 nomodify notrap
server 192.168.11.131
fudge 127.127.1.0 stratum 11
四行添加注释
#server 0.centos.pool.ntp.org iburst
#server 1.centos.pool.ntp.org iburst
#server 2.centos.pool.ntp.org iburst
#server 3.centos.pool.ntp.org iburst
# systemctl start ntpd.service
# systemctl enable ntpd.service
同步时间出错
# ntpdate 192.168.11.131
25 Jun 07:39:15 ntpdate[25429]: the NTP socket is in use, exiting
解决：
# lsof -i:123
-bash: lsof: command not found
# yum install -y lsof
# lsof -i:123
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
ntpd 1819 ntp 16u IPv4 33404 0t0 UDP *:ntp
ntpd 1819 ntp 17u IPv6 33405 0t0 UDP *:ntp
ntpd 1819 ntp 18u IPv4 33410 0t0 UDP localhost:ntp
ntpd 1819 ntp 19u IPv4 33411 0t0 UDP slave1:ntp
ntpd 1819 ntp 20u IPv6 33412 0t0 UDP localhost:ntp
ntpd 1819 ntp 21u IPv6 33413 0t0 UDP slave1:ntp
# kill -9 1819
再次更新时间
# ntpdate 192.168.11.131
24 Jun 23:37:27 ntpdate[1848]: step time server 192.168.11.131 offset -28828.363808 sec
# date
Sun Jun 24 23:37:32 CST 2018
useradd：
# groupadd hduser
# useradd -g hduser hduser
# passwd hduser
ssh免密码认证：
所有的节点生成authorized_keys：
# su hduser
$ cd
$ ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/home/hduser/.ssh/id_rsa):
Created directory '/home/hduser/.ssh'.
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/hduser/.ssh/id_rsa.
Your public key has been saved in /home/hduser/.ssh/id_rsa.pub.
The key fingerprint is:
SHA256:KfyLZTsN3U89CbFAoOsrkI9YRz3rdKR4vr/75R1A7eE hduser@master
The key's randomart image is:
+---[RSA 2048]----+
| .o. |
| . . .. |
| .. ..oo |
| o o.o .oo .|
| o +.S. . ..E.|
| + o.B... . oo.|
| o = =.=o + ..|
| . . o *oo. o o .|
| oo==+. . . |
+----[SHA256]-----+
$ cd .ssh/
$ cp id_rsa.pub authorized_keys
所有节点互相认证：
master：
[hduser@master .ssh]$ ssh-copy-id -i id_rsa.pub hduser@slave1
[hduser@master .ssh]$ ssh-copy-id -i id_rsa.pub hduser@slave2
验证：
[hduser@master .ssh]$ ssh slave1
Last failed login: Wed Jun 27 04:55:44 CST 2018 from 192.168.11.131 on ssh:notty
There was 1 failed login attempt since the last successful login.
Last login: Wed Jun 27 04:50:05 2018
[hduser@slave1 ~]$ exit
logout
Connection to slave1 closed.
[hduser@master .ssh]$ ssh slave2
Last login: Wed Jun 27 04:51:53 2018
[hduser@slave2 ~]$
slave1：
[hduser@slave1 .ssh]$ ssh-copy-id -i id_rsa.pub hduser@master
[hduser@slave1 .ssh]$ ssh-copy-id -i id_rsa.pub hduser@slave2
slave2：
[hduser@slave2 .ssh]$ ssh-copy-id -i id_rsa.pub hduser@master
[hduser@slave2 .ssh]$ ssh-copy-id -i id_rsa.pub hduser@slave1
上传包：
[hduser@master ~]$ cd src
[hduser@master src]$ ll
total 356128
-rw-r--r-- 1 root root 44575568 Jun 16 17:24 hadoop-0.20.2.tar.gz
-rw-r--r-- 1 root root 288430080 Mar 16 2016 jdk1.7.0_79.tar
配置jdk：
[hduser@master src]$ tar -xf jdk1.7.0_79.tar -C ..
[hduser@master src]$ cd ..
[hduser@master ~]$ vi .bashrc
添加
export JAVA_HOME=/home/hadoop/jdk1.7.0_79
export JRE_HOME=$JAVA_HOME/jre
export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar:$JRE_HOME/lib/rt.jar
export PATH=$PATH:$JAVA_HOME/bin
[hduser@master ~]$ source .bashrc
[hduser@master ~]$ java -version
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
其它两节点配置同上
配置hadoop：
各节点解压
tar -zxf hadoop-0.20.2.tar.gz -C ..
master：
[hduser@master conf]$ pwd
/home/hduser/hadoop-0.20.2/conf
[hduser@master conf]$ vi hadoop-env.sh
export JAVA_HOME=/home/hduser/jdk1.7.0_79
[hduser@master conf]$ vi core-site.xml
[hduser@master conf]$ vi hdfs-site.xml
[hduser@master conf]$ vi mapred-site.xml
[hduser@master conf]$ vi masters
#localhost
master
[hduser@master conf]$ vi slaves
#localhost
slave1
slave2
拷贝配置文件到其它两个节点
[hduser@master conf]$ scp hadoop-env.sh slave1:~/hadoop-0.20.2/conf/
[hduser@master conf]$ scp core-site.xml slave1:~/hadoop-0.20.2/conf/
[hduser@master conf]$ scp hdfs-site.xml slave1:~/hadoop-0.20.2/conf/
[hduser@master conf]$ scp mapred-site.xml slave1:~/hadoop-0.20.2/conf/
[hduser@master conf]$ scp masters slave1:~/hadoop-0.20.2/conf/
[hduser@master conf]$ scp slaves slave1:~/hadoop-0.20.2/conf/
[hduser@master conf]$ scp hadoop-env.sh slave2:~/hadoop-0.20.2/conf/
[hduser@master conf]$ scp core-site.xml slave2:~/hadoop-0.20.2/conf/
[hduser@master conf]$ scp hdfs-site.xml slave2:~/hadoop-0.20.2/conf/
[hduser@master conf]$ scp mapred-site.xml slave2:~/hadoop-0.20.2/conf/
[hduser@master conf]$ scp masters slave2:~/hadoop-0.20.2/conf/
[hduser@master conf]$ scp slaves slave2:~/hadoop-0.20.2/conf/
格式化文件系统
[hduser@master conf]$ cd ../bin
[hduser@master bin]$ ./hadoop namenode -format
启动服务
[hduser@master bin]$ ./start-all.sh
[hduser@master bin]$ jps
1681 JobTracker
1780 Jps
1618 SecondaryNameNode
1480 NameNode
[hduser@slave1 conf]$ jps
1544 Jps
1403 DataNode
1483 TaskTracker
[hduser@slave2 conf]$ jps
1494 TaskTracker
1414 DataNode
1555 Jps
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