hadoop免登陸

參考:http://wenku.baidu.com/link?url=n4PT7AhGnV7N8KevSEAMcCVGEaYqTuKmNodCQsUnR7qtAnWM0WDs8pFYLOpCUu9R9wE3VXzpmbEvur4hsv4ySOS7LDI4G3tuHvV4bgMeoCS1.安裝jdk：修改文件執行權限 ：chmod a+x(或u+x) jdk-6u37-linux-x64.bin, 安裝：./jdk-6u37-linux-x64.bin2.編輯 vi ~/.bash_profile ，增長內容(或vi /etc/profile)# set  java env(或environment)export JAVA_HOME=/home/spark/opt/java/jdk1.6.0_37export CLASSPATH=.:$JAVA_HOME/jre/lib:$JAVA_HOME/lib:$JAVA_HOME/lib/tools.jarPATH=$PATH:$HOME/bin:$JAVA_HOME/binexport PATH(或#set java environment  export JAVA_HOME=/usr/java/jdk1.6.0_26  export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export PATH=$PATH:$JAVA_HOME/bin export JAVA_HOME CLASSPATH PATH)保存並source  ~/.bash_profile（或source /etc/profile爲java創建符號連接，具體以下操做以下  cd /usr/bin   //切換目錄  ln -s -f /usr/java/jdk1.6.0_26/jre/bin/java   //創建符號鏈接 ln -s -f /usr/java/jdk1.6.0_26/bin/javac     //創建符號鏈接）3.測試：java -version(jre/lib的rt.pack  lib下的tool.pack 使用bin目錄下自帶的unpack200解壓)07:{要在哪一個節點免密碼登陸}1.ssh -keygen -t dsa -P '' -f ~/.ssh/id_dsa //生成祕鑰2.cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys //創建本地的免密碼登陸(從hadoop的官網拷貝）4.cat ~/id_dsa.pub >> .ssh/authorized_keys   //吧公鑰的內容追加劇定向到.ssh/authorized_keys//在namenode上3.scp id_dsa.pub root@（node3）:~//把公鑰拷到要免密碼登陸的節點把NameNode上的hadooop拷到datanode (hadoop所在目錄 若是免密碼登陸設置成功 就不須要輸密碼)scp -r ~/hadoop-1.2.1.tar.gz root@node2(主機名):~/解壓：tar -zxvf hadoop-1.2.1.tar.gzln -sf /root/hadoop-1.2.1 /home/hadoop-1.2//建立軟鏈把nede1（NameNode）的全部配置文件拷貝到DataNode：保證配置文件如出一轍conf目錄下：scp ./* root@node2:/home/hadoop-1.2/conf/格式化：hadoop的bin目錄下：./hadoop namenode -format啓動./start -dfs.sh若是失敗：vi hadoop-env.sh(把安裝jdk以後配置的java—home拷貝到給conf下的該文件中) service iptables stop