NO.2 安装配置

检测当前系统下的jdk安装情况：

[root@Centos 桌面]# rpm -qa | grep java

tzdata-java-2012j-1.el6.noarch

java-1.7.0-openjdk-1.7.0.9-2.3.4.1.el6_3.x86_64

java-1.6.0-openjdk-1.6.0.0-1.50.1.11.5.el6_3.x86_64

 

卸载当前所有的jdk：

[root@Centos 桌面]# rpm -e --nodeps tzdata-java-2012j-1.el6.noarch

[root@Centos 桌面]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.9-2.3.4.1.el6_3.x86_64

[root@Centos 桌面]# rpm -e --nodeps java-1.6.0-openjdk-1.6.0.0-1.50.1.11.5.el6_3.x86_64

 

复查是否卸载完全：无输出则卸载干净：

[root@Centos 桌面]# rpm -qa | grep java

[root@Centos 桌面]#

 

 

 

安装自己下载的jdk并配置环境变量，详尽参考“linux学习/NO.7”

 

 

······················································· JDK安装完成······························································

 

······················································· hadoop的安装开始··················································

 

1.在hadoop的conf目录下配置 hadoop-env.sh   core-site.xml   hdfs-site.xml   mapred-site.xml ，

首先解压hadoop.

            1.1 在hadoop-env.sh里的配置hadoop的JDK环境

            ---------------------------------------------

            [root@Centos ~]# cd hadoop-1.2.1/

            [root@Centos hadoop-1.2.1]# cd conf

            [root@Centos conf]# vi hadoop-env.sh

            ---------------------------------------------

            配置信息如下：

                export JAVA_HOME=/root/jdk1.8.0_65   

 

            1.2 在core-site.xml里的配置hadoop的HDFS地址及端口号

            ------------------------------------------------

            [root@Centos conf]# vi core-site.xml

            ------------------------------------------------

            配置信息如下：

                <configuration>

                    <property>

                        <name>fs.default.name</name>

                        <value>hdfs://localhost:9000</value>

                    </property>

                </configuration>

 

            1.3 在hdfs-site.xml里的配置hadoop的HDFS的配置

            -------------------------------------------------

            [root@Centos conf]# vi hdfs-site.xml

            -------------------------------------------------

            配置信息如下：

                <configuration>

                    <property>

                    <name>dfs.replication</name>

                    <value>1</value>

                    </property>

                </configuration>

 

            1.4 在mapred-site.xml里的配置hadoop的HDFS的配置

            -------------------------------------------------

            [root@Centos conf]# vi mapred-site.xml

            --------------------------------------------

            配置信息如下：

                <configuration>

                    <property>         

                      <name>mapred.job.tracker</name>

                      <value>localhost:9001</value>

                    </property>

                </configuration>

 

2.ssh免密码登录

--------------------------------------------------------------------

[root@Centos conf]# cd /root

[root@Centos ~]# ssh-keygen -t rsa

输出：

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:

ed:48:64:29:62:37:c1:e9:3d:84:bf:ad:4e:50:5e:66 root@Centos

The key's randomart image is:

+--[ RSA 2048]----+

|     ..o         |

|      +...       |

|    o.++= E      |

|   . o.B+=       |

|      . S+.      |

|       o.o.      |

|        o..      |

|       ..        |

|       ..        |

+-----------------+

c[root@Centos ~]# cd .ssh

[root@Centos .ssh]# ls

id_rsa  id_rsa.pub

[root@Centos .ssh]# cp id_rsa.pub  authorized_keys

[root@Centos .ssh]# ls

authorized_keys  id_rsa  id_rsa.pub

[root@Centos .ssh]# ssh localhost

The authenticity of host 'localhost (::1)' can't be established.

RSA key fingerprint is 3f:84:db:2f:53:a9:09:a6:61:a2:3a:82:80:6c:af:1a.

Are you sure you want to continue connecting (yes/no)? yes

Warning: Permanently added 'localhost' (RSA) to the list of known hosts.

-------------------------------------------------------------------------------

    验证免密码登录

-------------------------------------------------------------------------------

[root@Centos ~]# ssh localhost

Last login: Sun Apr  3 23:19:51 2016 from localhost

 

[root@Centos ~]# ssh localhost

Last login: Sun Apr  3 23:20:12 2016 from localhost

 

Connection to localhost closed.

[root@Centos ~]#

----------------------------SSH免密码登录设置成功----------------------------

 

 

格式化HDFS：

[root@Centos ~]# cd  /root/hadoop-1.2.1/

[root@Centos hadoop-1.2.1]#  bin/hadoop namenode -format

输出：

16/04/03 23:24:12 INFO namenode.NameNode: STARTUP_MSG:

/************************************************************

STARTUP_MSG: Starting NameNode

STARTUP_MSG:   host = java.net.UnknownHostException: Centos: Centos: unknown error

STARTUP_MSG:   args = [-format]

STARTUP_MSG:   version = 1.2.1

STARTUP_MSG:   build = https://svn.apache.org/repos/asf/hadoop/common/branches/branch-1.2 -r 1503152; compiled by 'mattf' on Mon Jul 22 15:23:09 PDT 2013

STARTUP_MSG:   java = 1.8.0_65

************************************************************/

16/04/03 23:24:13 INFO util.GSet: Computing capacity for map BlocksMap

16/04/03 23:24:13 INFO util.GSet: VM type       = 64-bit

16/04/03 23:24:13 INFO util.GSet: 2.0% max memory = 1013645312

16/04/03 23:24:13 INFO util.GSet: capacity      = 2^21 = 2097152 entries

16/04/03 23:24:13 INFO util.GSet: recommended=2097152, actual=2097152

16/04/03 23:24:15 INFO namenode.FSNamesystem: fsOwner=root

16/04/03 23:24:15 INFO namenode.FSNamesystem: supergroup=supergroup

16/04/03 23:24:15 INFO namenode.FSNamesystem: isPermissionEnabled=true

16/04/03 23:24:15 INFO namenode.FSNamesystem: dfs.block.invalidate.limit=100

16/04/03 23:24:15 INFO namenode.FSNamesystem: isAccessTokenEnabled=false accessKeyUpdateInterval=0 min(s), accessTokenLifetime=0 min(s)

16/04/03 23:24:15 INFO namenode.FSEditLog: dfs.namenode.edits.toleration.length = 0

16/04/03 23:24:15 INFO namenode.NameNode: Caching file names occuring more than 10 times

16/04/03 23:24:17 INFO common.Storage: Image file /tmp/hadoop-root/dfs/name/current/fsimage of size 110 bytes saved in 0 seconds.

16/04/03 23:24:18 INFO namenode.FSEditLog: closing edit log: position=4, editlog=/tmp/hadoop-root/dfs/name/current/edits

16/04/03 23:24:18 INFO namenode.FSEditLog: close success: truncate to 4, editlog=/tmp/hadoop-root/dfs/name/current/edits

16/04/03 23:24:18 INFO common.Storage: Storage directory /tmp/hadoop-root/dfs/name has been successfully formatted.

16/04/03 23:24:18 INFO namenode.NameNode: SHUTDOWN_MSG:

/************************************************************

SHUTDOWN_MSG: Shutting down NameNode at java.net.UnknownHostException: Centos: Centos: unknown error

************************************************************/

-----------------------------------------------------------------------------

此时格式化节点报错：Centos: unknown error--------紧接着下一步配置

--------------------------------------------------------------------------

[root@Centos hadoop-1.2.1]# vi /etc/hosts

    配置信息如下：

    127.0.0.1   localhost Centos

-------------------------------------------------------------------------

再一次进行格式化       

--------------------------------------------------------------------------

[root@Centos hadoop-1.2.1]# vi /etc/hosts

[root@Centos hadoop-1.2.1]# bin/hadoop namenode -format

具体情况如下图：

 

---------------------------namenode格式化成功------------------------------

启动hadoop ：

        关闭防火墙命令行  # service iptables stop

      启动hadoop集群命令行  # start-all.sh

      关闭hadoop集群命令行  # stop-all.sh

关闭防火墙：# service iptables stop

启动hadoop集群 ：

[root@Centos hadoop-1.2.1]# bin/start-all.sh

输出：

starting namenode, logging to /root/hadoop-1.2.1/libexec/../logs/hadoop-root-namenode-Centos.out

localhost: starting datanode, logging to /root/hadoop-1.2.1/libexec/../logs/hadoop-root-datanode-Centos.out

localhost: starting secondarynamenode, logging to /root/hadoop-1.2.1/libexec/../logs/hadoop-root-secondarynamenode-Centos.out

starting jobtracker, logging to /root/hadoop-1.2.1/libexec/../logs/hadoop-root-jobtracker-Centos.out

localhost: starting tasktracker, logging to /root/hadoop-1.2.1/libexec/../logs/hadoop-root-tasktracker-Centos.out

 

验证集群是否正常启动----5个节点在列表中则启动成功

再次验证启动项目

[root@Centos hadoop-1.2.1]# cd  /root/mahout-distribution-0.6/

[root@Centos mahout-distribution-0.6]# jps

30692 SecondaryNameNode

30437 NameNode

31382 Jps

30903 TaskTracker

30775 JobTracker

30553 DataNode

[root@Centos mahout-distribution-0.6]# jps

30692 SecondaryNameNode

31477 Jps

30437 NameNode

30903 TaskTracker

30775 JobTracker

30553 DataNode

[root@Centos mahout-distribution-0.6]# cd  /home/hadoop-1.2.1

关闭hadoop集群

[root@Centos hadoop-1.2.1]# bin/stop-all.sh

stopping jobtracker

localhost: stopping tasktracker

stopping namenode

localhost: stopping datanode

localhost: stopping secondarynamenode

[root@Centos hadoop-1.2.1]#

 

------------------------hadoop伪分布式安装成功------------------------

mahout的安装

            1.解压安装mahout ：解压到hadoop目录中

                [root@Centos hadoop-1.2.1]#  tar zxvf mahout-distribution-0.6.tar.gz

            2.配置环境变量

                    export HADOOP_HOME=/root/hadoop-1.2.1

                    export HADOOP_CONF_DIR=/root/hadoop-1.2.1/conf

                    export MAHOUT_HOME=/root/hadoop-1.2.1/mahoutdistribution-0.6

                    export MAHOUT_CONF_DIR=/root/hadoop-1.2.1/mahoutdistribution-0.6/conf

                    export PATH=$PATH:$MAHOUT_HOME/conf:$MAHOUT_HOME/bin

            3.测试mahout的启动

配置环境变量过程如下图：

 

--------------------------------------mahout安装成------------------------------------