一.Linux 系統連接狀態篇;
1、查看TCP連接狀態;
netstat -nat |awk '{print $6}'|sort|uniq-c|sort -rn netstat -n | awk '/^tcp/ {++S[$NF]};END {for(ain S) print a, S[a]}' 或 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 -c2.查找請求數請20個IP(常用於查找攻來源);
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 -n203.使用tcpdump嗅探80端口的訪問看看誰最高;tcpdump -i eth0 -tnn dst port 80 -c 1000 | awk-F"." '{print $1"."$2"."$3"."$4}' |sort | uniq -c | sort -nr |head -20
4、查找較多time_wait連接;
netstat -n|grep TIME_WAIT|awk '{print$5}'|sort|uniq -c|sort -rn|head -n20
5、找查較多的SYN連接;
netstat -an | grep SYN | awk '{print $5}' | awk-F: '{print $1}' | sort | uniq -c | sort -nr | more
6、根據端口列進程;
netstat -ntlp | grep 80 | awk '{print $7}' |cut -d/ -f1
二.網站日志分析篇;1.apache 日志(獲得訪問前10位的ip地址);
cat access.log|awk '{print $1}'|sort|uniq-c|sort -nr|head -10 cat access.log|awk '{counts[$(11)]+=1}; END{for(url in counts) print counts[url], url}'2.訪問次數最多的文件或頁面,取前20;
cat access.log|awk '{print $11}'|sort|uniq-c|sort -nr|head -203.列出傳輸最大的幾個exe文件(分析下載站的時候常用);
cat access.log |awk '($7~/.exe/){print $10" " $1 " " $4 " " $7}'|sort -nr|head -20
cat access.log |awk '($10 > 200000&& $7~/.exe/){print $7}'|sort -n|uniq -c|sort -nr|head -1005.如果日志最後一列記錄的是頁面文件傳輸時間,則有列出到客戶端最耗時的頁面
cat access.log |awk '($7~/.php/){print $NF " " $1 " " $4 " " $7}'|sort-nr|head -100
cat access.log |awk '($NF > 30){print$7}'|sort -n|uniq -c|sort -nr|head -208.統計網站流量(G);
cat access.log |awk '{sum+=$10} END {printsum/1024/1024/1024}'9.統計404的連接;
awk '($9 ~/404/)' access.log | awk '{print$9,$7}' | sort10.統計http status;
cat access.log |awk '{counts[$(9)]+=1}; END{for(code in counts) print code, counts[code]}' cat access.log |awk '{print $9}'|sort|uniq-c|sort -rn11.蜘蛛分析,查看是哪些蜘蛛在抓取內容。/usr/sbin/tcpdump -i eth0 -l -s 0 -w - dst port80 | strings | grep -i user-agent | grep -i -E 'bot|crawler|slurp|spider'
1、調試命令
strace -p pid
awk '/^$/ {c=c+1}END{print c}' /etc/init.d/sshd 20
awk -F ":" '{if($3>500) print $1}' /etc/passwd本文出自 “渲染不變的昨天” 博客,謝絕轉載!