web故障排查常用命令

端口连接类

netstat -nat |awk '{print $6}'|sort|uniq -c|sort -rn
netstat -n | awk '/^tcp/ {++S[$NF]};END {for(a in S) print a, S[a]}'
netstat -n | awk '/^tcp/ {++state[$NF]}; END {for(key in state) print key,"\t",state[key]}'
netstat -n | awk '/^tcp/ {++arr[$NF]};END {for(k in arr) print k,"\t",arr[k]}'
netstat -n |awk '/^tcp/ {print $NF}'|sort|uniq -c|sort -rn
netstat -ant | awk '{print $NF}' | grep -v '[a-z]' | sort | uniq -c

netstat -anlp|grep 80|grep tcp|awk '{print $5}'|awk -F: '{print $1}'|sort|uniq -c|sort -nr|head -n20
netstat -ant |awk '/:80/{split($5,ip,":");++A[ip[1]]}END{for(i in A) print A[i],i}' |sort -rn|head -n20

tcpdump -i eth0 -tnn dst port 80 -c 1000 | awk -F"." '{print $1"."$2"."$3"."$4}' | sort | uniq -c | sort -nr |head -n 20

netstat -n|grep TIME_WAIT|awk '{print $5}'|sort|uniq -c|sort -rn|head -n20

netstat -an | grep SYN | awk '{print $5}' | awk -F: '{print $1}' | sort | uniq -c | sort -nr | more

netstat -ntlp | grep 80 | awk '{print $7}' | cut -d/ -f1

netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

netstat -an -t | grep ":80" | grep ESTABLISHED | awk '{printf "%s %s\n",$5,$6}' | sort

netstat -n | awk '/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}'

Web日志类

cat access.log|awk '{print $1}'|sort|uniq -c|sort -nr|head -n 10
cat access.log|awk '{counts[$(11)]+=1}; END {for(url in counts) print counts[url], url}'

cat access.log|awk '{print $11}'|sort|uniq -c|sort -nr|head -n 20

cat access.log |awk '($7~/\.rar/){print $10 " " $1 " " $4 " " $7}'|sort -nr|head -n 20

cat access.log |awk '($10 > 200000 && $7~/\.rar/){print $7}'|sort -n|uniq -c|sort -nr|head -n 100

cat access.log |awk '($7~/\.php/){print $NF " " $1 " " $4 " " $7}'|sort -nr|head -n 100

cat access.log |awk '($NF > 60 && $7~/\.php/){print $7}'|sort -n|uniq -c|sort -nr|head -n 100

cat access.log |awk '($NF > 30){print $7}'|sort -n|uniq -c|sort -nr|head -n 20

cat access.log |awk '{sum+=$10} END {print sum/1024/1024/1024}'

awk '($9 ~/404/)' access.log | awk '{print $9,$7}' | sort

cat access.log |awk '{counts[$(9)]+=1}; END {for(code in counts) print code, counts
}'
cat access.log |awk '{print $9}'|sort|uniq -c|sort -rn


11.查看是哪些爬虫在抓取内容。

tcpdump -i eth0 -l -s 0 -w - dst port 80 | strings | grep -i user-agent | grep -i -E 'bot|crawler|slurp|spider'


12.按域统计流量

zcat squid_access.log.tar.gz| awk '{print $10,$7}' |awk 'BEGIN{FS="[ /]"}{trfc[$4]+=$1}END{for(domain in trfc){printf "%s\t%d\n",domain,trfc[domain]}}'


13.查看数据库执行的sql语句

tcpdump -i eth0 -s 0 -l -w - dst port 3306 | strings | egrep -i 'SELECT|UPDATE|DELETE|INSERT|SET|COMMIT|ROLLBACK|CREATE|DROP|ALTER|CALL'


14.调试命令

strace -p pid


15. 简单web

python -m SimpleHTTPServer [port] //默认8000端口


16.统计一下服务器下面所有jpg文件的大小

find / -name *.jpg -exec wc -c {} \;|awk '{print $1}'|awk '{a+=$1}END{print a}'


进程类
1.进程总数

ps aux | wc -l


2.清除僵死进程

ps -eal | awk '{ if ($2 == "Z") {print $4}}' | kill -9


3.杀掉80端口相关的进程

lsof -i :80|grep -v "PID"|awk '{print "kill -9",$2}'|sh


4.检查是否有异常错误记录

grep -i error /var/log/messages
grep -i fail /var/log/messages


5.跟踪指定进程的PID

gdb -p pid


文件类
1.列出当前目录中今天修改的文件

find . -maxdepth 1 -mmin -$((`date +%H`*60+`date +%M`))

find . -maxdepth 1 -newermt $(date --date='now' '+%Y-%m-%d')


2.列出3天内修改的文件

find . -mtime -3 -print

find / -mtime  +/- 数字 执行之前或之内的几天


3.找出2017-01-01这一天修改的文件，当前目录

find . -maxdepth 1 -newermt "2017-01-01"


其他
如何在编写SHELL显示信息，用EOF

cat << EOF
+--------------------------------------------------------------+
| === Welcome to opdev.me  ===                                |
+--------------------------------------------------------------+
EOF


[code] http://www.opdev.me/php-performance-improvement-opcache.html[/code]