目录/opt/soft/hadoop/sbin可设置为变量path

1.start.all.sh：
    a.hadoop-config.sh
    b.start-dfs.sh
            1)libexec/hadoop-config.sh

            2)sbin/hadoop-daemons.sh --config .. --hostname .. start namenode ...

            3)sbin/hadoop-daemons.sh --config .. --hostname .. start datanode ...

            4)sbin/hadoop-daemons.sh --config .. --hostname .. start sescondarynamenode ...

            5)sbin/hadoop-daemons.sh --config .. --hostname .. start zkfc ... //
    c.start-yarn.sh
            1)sbin/yarn-daemon.sh start resourcemanager

            2)sbin/yarn-daemons.sh start nodemanager

2.单独启动或关闭
    a.启动主节点
        hadoop-daemon.sh start namenode
    b.启动丛节点
        hadoop-daemon.sh start datanode slave
    c.开启resourcemanger
        yarn-daemon.sh start resouremanager
    d.开启nodemanger
        yarn-daemons.sh start nodemanager

3.查看端口
    netstat -ntlp | grep httpd
    netstat -anop | grep 500