Shell脚本查看linux系统性能瓶颈

2017-01-14 19:36:27来源:作者:人点击

linux服务器敲命令反应慢,网站访问慢,到底什么情况?根据本人的经验,主要原因可能是系统资源到达瓶颈,已经无法处理更多请求。在有监控系统情况下,可以直接通过WEB页面可视化看出是CPU瓶颈?硬盘瓶颈?还是网络瓶颈?如果公司服务器较少或者云服务器,就有可能没有一套监控系统,这时就要登陆到服务器,一条一条的敲命令,查找分析性能瓶颈。命令这么多,咋记得住啊!就算记得住,输入也费劲,于是就有了这个脚本,为了以后自己使用,另外也想分享给博友,学shell朋友能从中得到一丢丢启发。写的比较仓促,内容有点粗略,还望君见谅!

脚本目的:分析系统资源性能瓶颈

脚本功能:

1、查看CPU利用率与负载(top、vmstat、sar)

2、查看磁盘、Inode利用率与I/O负载(df、iostat、iotop、sar、dstat)

3、查看内存利用率(free、vmstat)

4、查看TCP连接状态(netstat、ss)

5、查看CPU与内存占用最高的10个进程(top、ps)

6、查看网络流量(ifconfig、iftop、iptraf)

脚本说明:通过一些常用的性能分析工具,计算出我们想知道的信息。

脚本如下:

# cat show_sys_info.sh

#!/bin/bash # os_check() { if [ -e /etc/redhat-release ]; then REDHAT=`cat /etc/redhat-release |cut -d' ' -f1` else DEBIAN=`cat /etc/issue |cut -d' ' -f1` fi if [ "$REDHAT" == "CentOS" -o "$REDHAT" == "Red" ]; then P_M=yum elif [ "$DEBIAN" == "Ubuntu" -o "$DEBIAN" == "ubutnu" ]; then P_M=apt-get else Operating system does not support. exit 1 fi } if [ $LOGNAME != root ]; then echo "Please use the root account operation." exit 1 fi if ! which vmstat &>/dev/null; then echo "vmstat command not found, now the install." sleep 1 os_check $P_M install procps -y echo "-----------------------------------------------------------------------" fi if ! which iostat &>/dev/null; then echo "iostat command not found, now the install." sleep 1 os_check $P_M install sysstat -y echo "-----------------------------------------------------------------------" fi while true; do select input in cpu_load disk_load disk_use disk_inode mem_use tcp_status cpu_top10 mem_top10 traffic quit; do case $input in cpu_load) #CPU利用率与负载 echo "---------------------------------------" i=1 while [[ $i -le 3 ]]; do echo -e "/033[32m 参考值${i}/033[0m" UTIL=`vmstat |awk '{if(NR==3)print 100-$15"%"}'` USER=`vmstat |awk '{if(NR==3)print $13"%"}'` SYS=`vmstat |awk '{if(NR==3)print $14"%"}'` IOWAIT=`vmstat |awk '{if(NR==3)print $16"%"}'` echo "Util: $UTIL" echo "User use: $USER" echo "System use: $SYS" echo "I/O wait: $IOWAIT" i=$(($i+1)) sleep 1 done echo "---------------------------------------" break ;; disk_load) #硬盘I/O负载 echo "---------------------------------------" i=1 while [[ $i -le 3 ]]; do echo -e "/033[32m 参考值${i}/033[0m" UTIL=`iostat -x -k |awk '/^[v|s]/{OFS=": ";print $1,$NF"%"}'` READ=`iostat -x -k |awk '/^[v|s]/{OFS=": ";print $1,$6"KB"}'` WRITE=`iostat -x -k |awk '/^[v|s]/{OFS=": ";print $1,$7"KB"}'` IOWAIT=`vmstat |awk '{if(NR==3)print $16"%"}'` echo -e "Util:" echo -e "${UTIL}" echo -e "I/O Wait: $IOWAIT" echo -e "Read/s:/n$READ" echo -e "Write/s:/n$WRITE" i=$(($i+1)) sleep 1 done echo "---------------------------------------" break ;; disk_use) #硬盘利用率 DISK_LOG=/tmp/disk_use.tmp DISK_TOTAL=`fdisk -l |awk '/^Disk.*bytes/&&///dev/{printf $2" ";printf "%d",$3;print "GB"}'` USE_RATE=`df -h |awk '/^//dev/{print int($5)}'` for i in $USE_RATE; do if [ $i -gt 90 ];then PART=`df -h |awk '{if(int($5)=='''$i''') print $6}'` echo "$PART = ${i}%" >> $DISK_LOG fi done echo "---------------------------------------" echo -e "Disk total:/n${DISK_TOTAL}" if [ -f $DISK_LOG ]; then echo "---------------------------------------" cat $DISK_LOG echo "---------------------------------------" rm -f $DISK_LOG else echo "---------------------------------------" echo "Disk use rate no than 90% of the partition." echo "---------------------------------------" fi break ;; disk_inode) #硬盘inode利用率 INODE_LOG=/tmp/inode_use.tmp INODE_USE=`df -i |awk '/^//dev/{print int($5)}'` for i in $INODE_USE; do if [ $i -gt 90 ]; then PART=`df -h |awk '{if(int($5)=='''$i''') print $6}'` echo "$PART = ${i}%" >> $INODE_LOG fi done if [ -f $INODE_LOG ]; then echo "---------------------------------------" rm -f $INODE_LOG else echo "---------------------------------------" echo "Inode use rate no than 90% of the partition." echo "---------------------------------------" fi break ;; mem_use) #内存利用率 echo "---------------------------------------" MEM_TOTAL=`free -m |awk '{if(NR==2)printf "%.1f",$2/1024}END{print "G"}'` USE=`free -m |awk '{if(NR==3) printf "%.1f",$3/1024}END{print "G"}'` FREE=`free -m |awk '{if(NR==3) printf "%.1f",$4/1024}END{print "G"}'` CACHE=`free -m |awk '{if(NR==2) printf "%.1f",($6+$7)/1024}END{print "G"}'` echo -e "Total: $MEM_TOTAL" echo -e "Use: $USE" echo -e "Free: $FREE" echo -e "Cache: $CACHE" echo "---------------------------------------" break ;; tcp_status) #网络连接状态 echo "---------------------------------------" COUNT=`netstat -antp |awk '{status[$6]++}END{for(i in status) print i,status[i]}'` echo -e "TCP connection status:/n$COUNT" echo "---------------------------------------" ;; cpu_top10) #占用CPU高的前10个进程 echo "---------------------------------------" CPU_LOG=/tmp/cpu_top.tmp i=1 while [[ $i -le 3 ]]; do #ps aux |awk '{if($3>0.1)print "CPU: "$3"% -->",$11,$12,$13,$14,$15,$16,"(PID:"$2")" |"sort -k2 -nr |head -n 10"}' > $CPU_LOG ps aux |awk '{if($3>0.1){{printf "PID: "$2" CPU: "$3"% --> "}for(i=11;i<=NF;i++)if(i==NF)printf $i"/n";else printf $i}}' |sort -k4 -nr |head -10 > $CPU_LOG #循环从11列(进程名)开始打印,如果i等于最后一行,就打印i的列并换行,否则就打印i的列 if [[ -n `cat $CPU_LOG` ]]; then echo -e "/033[32m 参考值${i}/033[0m" cat $CPU_LOG > $CPU_LOG else echo "No process using the CPU." break fi i=$(($i+1)) sleep 1 done echo "---------------------------------------" break ;; mem_top10) #占用内存高的前10个进程 echo "---------------------------------------" MEM_LOG=/tmp/mem_top.tmp i=1 while [[ $i -le 3 ]]; do #ps aux |awk '{if($4>0.1)print "Memory: "$4"% -->",$11,$12,$13,$14,$15,$16,"(PID:"$2")" |"sort -k2 -nr |head -n 10"}' > $MEM_LOG ps aux |awk '{if($4>0.1){{printf "PID: "$2" Memory: "$3"% --> "}for(i=11;i<=NF;i++)if(i==NF)printf $i"/n";else printf $i}}' |sort -k4 -nr |head -10 > $MEM_LOG if [[ -n `cat $MEM_LOG` ]]; then echo -e "/033[32m 参考值${i}/033[0m" cat $MEM_LOG > $MEM_LOG else echo "No process using the Memory." break fi i=$(($i+1)) sleep 1 done echo "---------------------------------------" break ;; traffic) #查看网络流量 while true; do read -p "Please enter the network card name(eth[0-9] or em[0-9]): " eth #if [[ $eth =~ ^eth[0-9]$ ]] || [[ $eth =~ ^em[0-9]$ ]] && [[ `ifconfig |grep -c "/<$eth/>"` -eq 1 ]]; then if [ `ifconfig |grep -c "/<$eth/>"` -eq 1 ]; then break else echo "Input format error or Don't have the card name, please input again." fi done echo "---------------------------------------" echo -e " In ------ Out" i=1 while [[ $i -le 3 ]]; do #OLD_IN=`ifconfig $eth |awk '/RX bytes/{print $2}' |cut -d: -f2` #OLD_OUT=`ifconfig $eth |awk '/RX bytes/{print $6}' |cut -d: -f2` OLD_IN=`ifconfig $eth |awk -F'[: ]+' '/bytes/{if(NR==8)print $4;else if(NR==5)print $6}'` #CentOS6和CentOS7 ifconfig输出进出流量信息位置不同,CentOS6中RX与TX行号等于8,CentOS7中RX行号是5,TX行号是5,所以就做了个判断. OLD_OUT=`ifconfig $eth |awk -F'[: ]+' '/bytes/{if(NR==8)print $9;else if(NR==7)print $6}'` sleep 1 NEW_IN=`ifconfig $eth |awk -F'[: ]+' '/bytes/{if(NR==8)print $4;else if(NR==5)print $6}'` NEW_OUT=`ifconfig $eth |awk -F'[: ]+' '/bytes/{if(NR==8)print $9;else if(NR==7)print $6}'` IN=`awk 'BEGIN{printf "%.1f/n",'$((${NEW_IN}-${OLD_IN}))'/1024/128}'` OUT=`awk 'BEGIN{printf "%.1f/n",'$((${NEW_OUT}-${OLD_OUT}))'/1024/128}'` echo "${IN}MB/s ${OUT}MB/s" i=$(($i+1)) sleep 1 done echo "---------------------------------------" break ;; quit) exit 0 ;; *) echo "---------------------------------------" echo "Please enter the number." echo "---------------------------------------" break ;; esac done done

注意:在原来基础上增加了退出选项,同时也更新了一些小bug,以下图片没有显示。

运行效果如下:

# sh show_sys_info.sh

wKiom1XaurSDzLBXAAMdO4UDpdI025.jpg

wKioL1XavNDz2ColAAKfiL9gQcY036.jpg

wKiom1XausWyO2gVAAFAY7EdoqI526.jpg

wKioL1XavOLSOWyMAAC8Xbwvrnc180.jpg

wKiom1XautjQWnVRAAD4ZKO60co516.jpg

 

wKiom1XauuGijj0hAAFHNT4ntPY686.jpg

wKioL1XavP_w4aoRAAKkhcqRrjA796.jpg

wKiom1XauvSTS6AXAAYZcjwUE-I338.jpg

wKioL1XavRPRRn_lAAEmDF96Tqk993.jpg

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