1. #启动
    2. nohup /opt/module/flume/bin/flume-ng agent --conf-file /opt/module/flume/conf/kafka-flume-hdfs.conf --name a1 -Dflume.root.logger=INFO,LOGFILE >/opt/module/flume/log2.txt 2>&1 &
    3. #关闭
    5. ps -ef | grep kafka-flume-hdfs
    6. kill  pid #不要用kill -9