为方便问题发生后，问题原因的分析排查，我们可以在服务器中事先部署如下脚本，方便故障发生后，问题原因的分析排查
脚本部署方法：
1.将脚本【top_monitor.sh】上传到服务器
2.登陆虚拟机，并切换到root用户
3.执行命令: chmod +x <path>/top_monitor.sh 【<path>替换成实际脚本上传的目录】
4.执行命令：crontab -e
5.添加定时任务：* * * * * <the path of the script>/top_monitor.sh <the path of ouputs saved> <keeps>
备注：
范例：* * * * * /root/top_monitor.sh /var/tmp/ 72 &
a.这里的keeps以小时为单位，如果保留三天的话，就输入72
b.该脚本每五秒钟收集一次top/vmstat/iostat命令的输出，每分钟会生成一个性能数据文件
c.不要把用户数据放到该目录下，否则会被清理掉
6.搜集到的性能日志格式如下：
-- ::
top - :: up day, min, users, load average: 0.00, 0.00, 0.00
Tasks: total, running, sleeping, stopped, zombie
Cpu(s): 1.0%us, 0.5%sy, 0.0%ni, 98.2%id, 0.3%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 3530640k total, 778368k used, 2752272k free, 127976k buffers
Swap: 0k total, 0k used, 0k free, 352288k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
root S 1.9 0.0 :07.04 events/
root S 0.0 0.0 :07.80 init
root S 0.0 0.0 :00.01 kthreadd
root RT S 0.0 0.0 :02.09 migration/
root S 0.0 0.0 :00.79 ksoftirqd/
root RT S 0.0 0.0 :00.00 stopper/
root RT S 0.0 0.0 :00.13 watchdog/
root RT S 0.0 0.0 :02.19 migration/
root RT S 0.0 0.0 :00.00 stopper/
root S 0.0 0.0 :00.80 ksoftirqd/
root RT S 0.0 0.0 :00.13 watchdog/
root S 0.0 0.0 :04.85 events/
root S 0.0 0.0 :00.00 events/
root S 0.0 0.0 :00.00 events/
root S 0.0 0.0 :00.00 events_long/
root S 0.0 0.0 :00.00 events_long/
root S 0.0 0.0 :00.00 events_power_ef
root S 0.0 0.0 :00.00 events_power_ef
root S 0.0 0.0 :00.00 cgroup
root S 0.0 0.0 :00.00 khelper
root S 0.0 0.0 :00.00 netns
root S 0.0 0.0 :00.00 async/mgr
root S 0.0 0.0 :00.00 pm
root S 0.0 0.0 :00.39 sync_supers
root S 0.0 0.0 :00.06 bdi-default
root S 0.0 0.0 :00.00 kintegrityd/
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st Linux 2.6.-696.3..el6.x86_64 (hlmcent69nma) // _x86_64_ ( CPU) avg-cpu: %user %nice %system %iowait %steal %idle
1.00 0.00 0.52 0.27 0.00 98.20 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdc 0.00 0.00 0.00 0.00 0.03 0.00 8.02 0.00 1.88 1.88 0.00 1.88 0.00
sdb 0.00 6.55 0.01 0.08 0.09 3249.50 37296.35 0.00 13.02 0.60 14.82 0.50 0.00
sda 0.04 15.12 0.12 2.52 6.35 141.07 55.83 0.01 4.93 6.92 4.83 3.29 0.87
脚本详情如下：
#! /bin/bash if [ $# != 2 ]; then
echo "Invalid option, try top_monitor.sh <path> <hours>"
exit
fi export dir=$1
export keeps=$2 ## Create topMon folder
if [ ! -d "$dir" ]; then
mkdir $dir
fi mkdir $dir/topMon file=$dir/topMon/"topMon_"`date +%Y%m%d`
file=$dir/topMon/"topMon_"`date +%Y%m%d%H%M%S` ## Cleanup expired outputs
for i in `find $dir/topMon/ -type f -atime +$keeps -print`
#for i in `find $dir/topMon/ -type f -amin +$keeps -print`
do
rm -rf $i
done ## Record top ouputs
for i in {0..10}
do
date +"%Y-%m-%d %H:%M:%S" >> $file
top -b -n 1 | head -33 >> $file
vmstat >> $file
iostat -x 1 1 >> $file
sleep 5
done