CSDN■不看就亏系列！这里有完整的 Hadoop 集群搭建教程，和最易懂的 Hadoop 概念！| 附代码( 三 )
4） obtracker : hadoop的map/reduce调度器 ， 负责与任务节点通信分配计算任何并跟踪任务进度 ， 这个服务器也是单点的 。
5）DataNode : Hadoop的数据节点 ， 负责存储数据
6）tasktracker: hadoop的调度程度 ， 负责map和reduce的任务的启动和执行
hadoop集群搭建
本文插图
1）环境 配好IP ， 关闭iptables ，关闭selinux,配置hosts
[root@ chenc01 ~]# service iptables stop [root@ chenc01 ~]# setenforce 0 [root@ chenc01 ~]# vim /etc/hosts 127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4 ::1 localhost localhost.localdomain localhost6 localhost6.localdomain6 10.0.0.61 chenc01 10.0.0.62 chenc02 10.0.0.63 chenc032）创建普通用户 三台服务器上都要创建普通用户 ， hadoop ， 配置密码：123456[root@ chenc01 ~]# useradd -u 8000 hadoop ; echo 123456 | passwd --stdin hadoop 更改用户 hadoop 的密码。 passwd： 所有的身份验证令牌已经成功更新 。 3） 设置namenode [root@ chenc01 ~]# ssh-keygen Generating public/private rsa key pair. Enter file in which to save the key (/root/.ssh/id_rsa): Created directory '/root/.ssh'. 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: f1:7c:f6:6c:81:f5:a6:2a:74:d1:f2:95:50:38:ad:6f root@chenc01.localdomain The key's randomart image is: +--[ RSA 2048]----+ | +. | | + . | | . .= .| | + o+.o.| | S o ++o.o| | .o.o.E | | . . * | | . o | | .. | ++ [root@ chenc01 ~]# ssh-copy-id root@10.0.0.62 The authenticity of host '10.0.0.62 (10.0.0.62)' can't be established. RSA key fingerprint is 9b:57:b9:86:84:90:a4:4b:44:3e:18:9f:8a:29:6f:e5. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '10.0.0.62' (RSA) to the list of known hosts. root@10.0.0.62's password: Now try logging into the machine, with "ssh 'root@10.0.0.62'", and check in: .ssh/authorized_keys to make sure we haven't added extra keys that you weren't expecting. [root@ chenc01 ~]# ssh-copy-id root@10.0.0.63 The authenticity of host '10.0.0.63 (10.0.0.63)' can't be established. RSA key fingerprint is 9b:57:b9:86:84:90:a4:4b:44:3e:18:9f:8a:29:6f:e5. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '10.0.0.63' (RSA) to the list of known hosts. root@10.0.0.63's password: Now try logging into the machine, with "ssh 'root@10.0.0.63'", and check in:
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