由于业务端日志采集格式不规范，经常会产生各种异常导致flume停止工作，如果对这些参数格式一一进行校验，影响采集速度，日志数据有一定的容错性。编一个一个脚本，不断监控flume运行状况，遇到异常，自动重启flume。

#!/bin/bash
 
export FLUME_HOME=/opt/flume
while true
do
pc=`ps -ef | grep kafka-flume-hdfs.conf | grep -v "grep" | wc -l`
 
if [[ $pc -lt 1 ]]
then
echo "detected no flume process.... preparing to launch flume agent...... "
nohup ${FLUME_HOME}/bin/flume-ng agent --conf-file ${FLUME_HOME}/conf/kafka-flume-hdfs.conf --name a1 -Dflume.root.logger=INFO,LOGFILE >${FLUME_HOME}/flume.log   2>&1 &
else
echo "detected flume process number is : $pc "
fi
 
sleep 30m
 
done
``

以守护线程的方式启动脚本

nohup check_flume.sh &