Linux下部署Hadoop伪分布模式

Generating public/private rsa key pair. Enter file in which to save the key (/home/hadoop/.ssh/id_rsa): Created directory /home/hadoop/.ssh. Enter passphrase (empty for no passphrase): Enter same passphrase again: Passphrases do not match.  Try again. Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/hadoop/.ssh/id_rsa. Your public key has been saved in /home/hadoop/.ssh/id_rsa.pub. The key fingerprint is: 2f:a9:60:c7:dc:38:8f:c7:bb:70:de:d4:39:c3:39:87 hadoop@promote.cache-dns.local The keys randomart image is: +--[ RSA 2048]----+ |                 | |                 | |                 | |                 | |        S        | |     o o o o +   | |    o B.= o E .  | |   . o Oo+   =   | |      o.=o.      | +-----------------+
最终将在/home/hadoop/.ssh/路径下生成私钥id_rsa和公钥id_rsa.pub [hadoop@promote .ssh]$ cd /home/hadoop/.ssh/ [hadoop@promote .ssh]$ ls id_rsa  id_rsa.pub 修改sshd服务配置文件： [hadoop@promote .ssh]$ su root [root@promote .ssh]# vi /etc/ssh/sshd_config 启用RSA加密算法验证（去掉前面的#号）
PubkeyAuthentication yes # The default is to check both .ssh/authorized_keys and .ssh/authorized_keys2 # but this is overridden so installations will only check .ssh/authorized_keys AuthorizedKeysFile      .ssh/authorized_keys

修改mapred-site.xml：
[hadoop@promote bin]$ sh start-all.sh starting namenode, logging to /home/hadoop/hadoop-1.2.1/libexec/../logs/hadoop-hadoop-namenode-promote.cache-dns.local.out localhost: starting datanode, logging to /home/hadoop/hadoop-1.2.1/libexec/../logs/hadoop-hadoop-datanode-promote.cache-dns.local.out localhost: starting secondarynamenode, logging to /home/hadoop/hadoop-1.2.1/libexec/../logs/hadoop-hadoop-secondarynamenode-promote.cache-dns.local.out starting jobtracker, logging to /home/hadoop/hadoop-1.2.1/libexec/../logs/hadoop-hadoop-jobtracker-promote.cache-dns.local.out localhost: starting tasktracker, logging to /home/hadoop/hadoop-1.2.1/libexec/../logs/hadoop-hadoop-tasktracker-promote.cache-dns.local.out
[root@promote .ssh]# service sshd restart Redirecting to /bin/systemctl restart  sshd.service [root@promote .ssh]# ps -ef|grep sshd root      1995     1  0 22:33 ?        00:00:00 sshd: hadoop [priv] hadoop    2009  1995  0 22:33 ?        00:00:00 sshd: hadoop@pts/0 root      4171     1  0 23:11 ?        00:00:00 /usr/sbin/sshd -D root      4175  3397  0 23:12 pts/0    00:00:00 grep --color=auto sshd
然后切换回hadoop用户，将ssh证书公钥拷贝至/home/hadoop/.ssh/authorized_keys文件中 [root@promote .ssh]# su hadoop [hadoop@promote .ssh]$ cat id_rsa.pub authorized_keys 修改authorized_keys文件的权限为644（这步一定要有） [hadoop@promote .ssh]$ chmod 644 authorized_keys [hadoop@promote .ssh]$ ssh localhost The authenticity of host localhost (127.0.0.1) cant be established. RSA key fingerprint is 25:1f:be:72:7b:83:8e:c7:96:b6:71:35:fc:5d:2e:7d. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added localhost (RSA) to the list of known hosts. Last login: Thu Feb 13 23:42:43 2014 第一次登陆将会将证书内容保存在/home/hadoop/.ssh/known_hosts文件中，以后再次登陆将不需要输入密码 [hadoop@promote .ssh]$ ssh localhost Last login: Thu Feb 13 23:46:04 2014 from localhost.localdomain 至此ssh证书部分配置完成 第二步：安装JDK [hadoop@promote ~]$ java -version java version "1.7.0_25" OpenJDK Runtime Environment (fedora-2.3.10.3.fc19-i386) OpenJDK Client VM (build 23.7-b01, mixed mode) 将OpenJDK换为Oracle的Java SE [hadoop@promote .ssh]$ cd ~ [hadoop@promote ~]$ uname -i i386 在Oracle的官网下载jdk-6u45-linux-i586.bin后上传至服务器，赋予权限并进行安装，最后删除安装包 [hadoop@promote ~]$ chmod u+x jdk-6u45-linux-i586.bin [hadoop@promote ~]$ ./jdk-6u45-linux-i586.bin [hadoop@promote ~]$ rm -rf jdk-6u45-linux-i586.bin [hadoop@promote conf]$ export PATH=$PATH:/home/hadoop/jdk1.6.0_45/bin 出现以下结果说明JDK成功安装： [hadoop@promote ~]$ java -version java version "1.6.0_45" Java(TM) SE Runtime Environment (build 1.6.0_45-b06) Java HotSpot(TM) Client VM (build 20.45-b01, mixed mode, sharing) 第三步：安装Hadoop 在Hadoop官网下载hadoop-1.2.1.tar.gz并上传至服务器/home/hadoop路径下 [hadoop@promote ~]$ tar -xzf hadoop-1.2.1.tar.gz [hadoop@promote ~]$ rm -rf hadoop-1.2.1.tar.gz [hadoop@promote ~]$ cd hadoop-1.2.1/conf/ [hadoop@promote conf]$ vi hadoop-env.sh 将JAVA_HOME指向第二步安装的JDK所在目录片 # The java implementation to use.  Required. export JAVA_HOME=/home/hadoop/jdk1.6.0_45 保存并退出 第四步：修改Hadoop配置文件 修改core-site.xml：
保姆级丨Hadoop部署 Hadoop是一个由Apache基金会所开发的分布式系统基础架构。用户可以在不了解分布式底层细节的情况下，开发分布式程序。充分利用集群的威力进行高速运算和存储。