Version 16 (modified by waue, 16 years ago) (diff) |
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DRBL叢集上運行HADOOP
Hadoop Cluster Based on DRBL
- 此篇的目的在於利用DRBL統整一個Cluster,並在上面運行Hadoop。
- 由於DRBL為無碟系統,並非一般的Cluster,因此有些地方需要注意。
零、環境說明
環境中共有七台機器,一台為drbl server,也是hadoop的namenode,其他節點則client 與datanode,如下:
名稱 | ip | drbl用途 | hadoop 用途 |
hadoop | 192.168.1.254 | drbl server | namenode |
hadoop | 192.168.1.2 | drbl server | namenode |
hadoop | 192.168.1.3 | drbl clinet | datanode |
hadoop | 192.168.1.4 | drbl clinet | datanode |
hadoop | 192.168.1.5 | drbl clinet | datanode |
hadoop | 192.168.1.6 | drbl clinet | datanode |
hadoop | 192.168.1.7 | drbl clinet | datanode |
介紹drbl server環境如下:
debian | etch (4.0) | server - 64 bit |
DRBL為無碟系統,因此只要將drbl server系統與所需服務安裝好,則其他的client網路開機後,就會載入以server為依據的檔案系統,也就是說,只有某些特定資料夾內的內容(如 /etc /root /home /tmp /var ...)會各自不同之外,其他都一樣。舉例若改了server內/etc/hosts檔的,則其他的client都會自動即時一起更改(因為是用NFS mount 上來的)。
因此,只要先在drbl server上完成了一、安裝,二、設定之後,在將其他的client開機然後依照三、操作 就可以了。
一、安裝
安裝drbl
- 詳見 DRBL的安裝
安裝 java 6
- 在套件庫裡 /etc/apt/sources.list 加入 non-free 庫以及 backports 網址才能安裝 sun-java6
deb http://opensource.nchc.org.tw/debian/ etch main contrib non-free deb-src http://opensource.nchc.org.tw/debian/ etch main contrib non-free deb http://security.debian.org/ etch/updates main contrib non-free deb-src http://security.debian.org/ etch/updates main contrib non-free deb http://www.backports.org/debian etch-backports main non-free deb http://free.nchc.org.tw/drbl-core drbl stable
- 安裝key及java6
$ wget http://www.backports.org/debian/archive.key $ sudo apt-key add archive.key $ apt-get update $ apt-get install sun-java6-bin sun-java6-jdk sun-java6-jre
安裝 Hadoop 0.18.3
$ cd /opt $ wget http://ftp.twaren.net/Unix/Web/apache/hadoop/core/hadoop-0.18.3/hadoop-0.18.3.tar.gz $ tar zxvf hadoop-0.18.3.tar.gz hadoop:/opt# ln -sf hadoop-0.18.3 hadoop
二、設定 Hadoop
- 在 /etc/bash.bashrc 的最末加入 以下資訊
PATH=$PATH:/opt/drbl/bin:/opt/drbl/sbin export JAVA_HOME=/usr/lib/jvm/java-6-sun export HADOOP_HOME=/opt/hadoop/
- 編輯 /etc/hosts 把下面內容貼在最後
192.168.1.254 gm2.nchc.org.tw 192.168.1.1 hadoop101 192.168.1.10 hadoop110 192.168.1.11 hadoop111 192.168.1.2 hadoop102 192.168.1.3 hadoop103 192.168.1.4 hadoop104 192.168.1.5 hadoop105 192.168.1.6 hadoop106 192.168.1.7 hadoop107 192.168.1.8 hadoop108 192.168.1.9 hadoop109
- 編輯 /opt/hadoop-0.18.3/conf/hadoop-env.sh
-
hadoop-0.18.3/conf/hadoop-env.sh
old new 6 6 # remote nodes. 7 7 # The java implementation to use. Required. 8 # export JAVA_HOME=/usr/lib/j2sdk1.5-sun 8 export JAVA_HOME=/usr/lib/jvm/java-6-sun 9 export HADOOP_HOME=/opt/hadoop-0.18.3 10 export HADOOP_CONF_DIR=$HADOOP_HOME/conf 11 export HADOOP_LOG_DIR=/root/hadoop/logs 9 12 # Extra Java CLASSPATH elements. Optional. 10 13 # export HADOOP_CLASSPATH=
-
- 編輯 /opt/hadoop-0.18.3/conf/hadoop-site.xml
-
hadoop-0.18.3/conf/hadoop-site.xml
old new 4 4 <!-- Put site-specific property overrides in this file. --> 5 5 6 6 <configuration> 7 7 <property> 8 <name>fs.default.name</name> 9 <value>hdfs://gm2.nchc.org.tw:9000/</value> 10 <description> 11 The name of the default file system. Either the literal string 12 "local" or a host:port for NDFS. 13 </description> 14 </property> 15 <property> 16 <name>mapred.job.tracker</name> 17 <value>hdfs://gm2.nchc.org.tw:9001</value> 18 <description> 19 The host and port that the MapReduce job tracker runs at. If 20 "local", then jobs are run in-process as a single map and 21 reduce task. 22 </description> 23 </property> 8 24 </configuration>
-
- 編輯 /opt/hadoop/conf/slaves
hadoop102 hadoop103 hadoop104 hadoop105 hadoop106 hadoop107 hadoop
三、DRBL 操作
開啟client
- 將所有的 client 開啟,並且如下
****************************************************** NIC NIC IP Clients +------------------------------+ | DRBL SERVER | | | | +-- [eth2] 140.110.xxx.130| +- to WAN | | | +-- [eth1] 192.168.1.254 +- to clients group 1 [ 6 clients, their IP | | from 192.168.1.2 - 192.168.1.7] +------------------------------+ ****************************************************** Total clients: 6 ******************************************************
ssh
- 編寫 /etc/ssh/ssh_config
StrictHostKeyChecking no
- 執行
$ ssh-keygen -t rsa -b 1024 -N "" -f ~/.ssh/id_rsa $ cp ~/.ssh/id_rsa.pub ~/.ssh/authorized_keys
- 寫個自動化 auto.shell 並執行
#!/bin/bash for ((i=2;i<=7;i++)); do scp scp -r ~/.ssh/ "192.168.1.$i":~/ scp /etc/ssh/ssh_config "192.168.1.$i":/etc/ssh/ssh_config ssh "192.168.1.$i" /etc/init.d/ssh restart done
- 正確無誤則可免密碼登入
dsh
- 此節非必要可不做
$ sudo apt-get install dsh $ mkdir -p .dsh $ for ((i=2;i<=7;i++)); do echo "192.168.1.$i" >> .dsh/machines.list; done
並執行
$ dsh -a source /etc/bash.bashrc
DRBL Server as Hadoop namenode
- 啟動
bin/hadoop namenode -format bin/start-all
- 測試
mkdir input cp *.txt input/ bin/hadoop dfs -put input input bin/hadoop jar hadoop-*-examples.jar wordcount input ouput
- browse http://gm2.nchc.org.tw:50070 for DFS status
參考
問題排解
- drbl似乎安裝不順
drblsrv -i 出現以下錯誤訊息
Kernel 2.6 was found, so default to use initramfs. The requested kernel "" 2.6.18-6-amd64 kernel files are NOT found in /tftpboot/node_root/lib/modules/s and /tftpboot/node_root/boot in the server! The necessary modules in the network initrd can NOT be created! Client will NOT remote boot correctly! Program terminated! Done!
ps: 原因為 apt 的鏡像站台沒有複製到資料因此無法安裝新kernel,導致出現問題