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：

#!/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 1fiif ! which vmstat &>/dev/null; then echo "vmstat command not found, now the install." sleep 1 os_check $P_M install procps -y echo "-----------------------------------------------------------------------"fiif ! which iostat &>/dev/null; then echo "iostat command not found, now the install." sleep 1 os_check $P_M install sysstat -y echo "-----------------------------------------------------------------------"fiwhile 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 donedone

执行效果如下：