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
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|
#!/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
本文转自 李振良OK 51CTO博客，原文链接：http://blog.51cto.com/lizhenliang/1687612，如需转载请自行联系原作者
