hadoop集群启动步骤

（1）启动三个机器的日志节点：xiaoye@ubuntu:~$ hadoop/sbin/hadoop-daemons.sh start jorunalnode

（2）单独启动ubuntu的namenode,注意命令的daemon不带s哦。xiaoye@ubuntu:~$ hadoop/sbin/hadoop-daemon.sh start namenode 

（3）ubuntu2节点执行命令：xiaoye@ubuntu2:~$ ./hadoop/bin/hdfs namenode -bootstrapStandby  

（4）ubuntu2节点单独启动namenode;xiaoye@ubuntu2:~$ ./hadoop/sbin/hadoop-daemon.sh  start namemode

(5) ubuntu启动所有datanode :xiaoye@ubuntu:~$ ./hadoop/sbin/hadoop-daemons.sh start datanode 

(6)ubuntu3启动yarn资源管理：xiaoye@ubuntu3:~$ ./hadoop/sbin/start-yarn.sh 

（7）ubuntu启动所有zkfc :xiaoye@ubuntu:~$ ./hadoop/sbin/hadoop-daemons.sh start zkfc