Linux监控进程资源消耗

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涉及两块，一块是获取资源消耗信息，一块是定时采集。
获取资源消耗用到了top，ps等命令，脚本如下

PROCESS_NAME=$1
SEPARATOR="\t\t"

PROCESS_ID=`ps -ef|grep $PROCESS_NAME |grep -v grep|grep -v PPID|awk '{ print $2}'`

# ps -o pcpu is the average cpu from start, not what we want
# -n should be more than 1 as the first sample is always 0, bug of top?
INFO=`top -p $PROCESS_ID -b -n 2 | grep $PROCESS_ID|awk '{ print $5"\t"$6"\t"$9}'`

# VIRT：virtual memory usage
# RES：resident memory usage
# SHR：shared memory 共享内存
# skip the result of the first time
VIRT=`echo $INFO|awk '{print $4}'`
RES=`echo $INFO|awk '{print $5}'`
CPU=`echo $INFO|awk '{print $6}'`

# Threads
THREADS=`ps -mq $PROCESS_ID | grep -c - -`

#handles
HANDLES=`ls /proc/$PROCESS_ID/fd | wc -l` 

# time
CURRENT=`date "+%Y-%m-%d %H:%M:%S"`

#output
#echo -e "Time${SEPARATOR}{SEPARATOR}PID${SEPARATOR}${SEPARATOR}VIRT${SEPARATOR}RES${SEPARATOR}CPU${SEPARATOR}Threads${SEPARATOR}Handles"
echo -e "$CURRENT$SEPARATOR$PROCESS_ID$SEPARATOR$VIRT$SEPARATOR$RES$SEPARATOR$CPU$SEPARATOR$THREADS$SEPARATOR$HANDLES"

一块是定时采集，需要用到crontab
crontab -e可以直接编辑需要执行的任务，编辑之后crond会自动reload，任务参考如下：

* * * * * /root/scripts/monitor.sh

表示每分钟执行一次monitor.sh脚本
可以通过crontab -l查看是否已经创建的任务。
cron日志：/var/log/cron，可以确认脚本执行情况。
定时任务定义参考：Linux定时任务Crontab命令详解