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                一)錯誤日志 1、介紹 功能:配置記錄nginx啟動及運行過程中所產生的錯誤,是調試Nginx服務的重要手段,屬于核心模塊 2、命令 error_log 語法: Syntax: error_log file [level]; Default: error_log logs/error.log error; 案例: server { listen 80; server_name www.a.com a.com; error_log /vhosts/web1/logs/error_log; if ( $http_host != "www.a.com" ){ rewrite ^/(.*)$ http://www.a.com/$1 permanent; } location / { root "/vhosts/web1"; index index.html index.htm; } location ~* \.php$ { fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; } error_page 404 =302 /404.html; } 說明:可以為每個location配置不同的錯誤路徑 二)訪問日志 1)log_format log_format name [escape=default|json] string ...; 案例: log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; $remote_addr 客戶端地址 $http_x_forwarded_for 設置web節點記錄客戶端地址的配置 $remote_user 客戶端用戶名稱 $request 請求的host $status 狀態 $body_bytes_sents 報文主體大小 $http_referer 上一個跳轉頁面 $http_user_agent 客戶端瀏覽器 $request_time 請求處理時間 2)access_log 語法: access_log path [format [buffer=size] [gzip[=level]] [flush=time] [if=condition]]; access_log off; 案例: server { listen 80; server_name www.a.com a.com; error_log /vhosts/web1/logs/error_log; access_log /vhosts/web1/logs/access_log; if ( $http_host != "www.a.com" ){ rewrite ^/(.*)$ http://www.a.com/$1 permanent; } location / { root "/vhosts/web1"; index index.html index.htm; } [root@static logs]# /usr/local/nginx/sbin/nginx -s reload [root@static logs]# ll total 4 -rw-r--r--. 1 root root 0 Dec 15 15:31 access_log -rw-r--r--. 1 root root 194 Dec 15 14:50 error_log 查看 [root@static logs]# tail access_log 10.2.18.231 - - [15/Dec/2017:15:34:46 +0800] "GET / HTTP/1.1" 200 18 "-" "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36" 三)open_log_file_cache 語法: Syntax: open_log_file_cache max=N [inactive=time] [min_uses=N] [valid=time]; open_log_file_cache off; Default: open_log_file_cache off; 對于每一條日志記錄,都將是先打開文件,再寫入日志,然后關閉 功能: 定義一個緩存,存儲常用日志的文件描述符,這些日志的名稱包含變量 max: 設置緩存描述符的最大數量 inactive: 設置在此期間沒有訪問的緩存描述符 min_uses: 設置在inactive時間內,日志文件最少使用多少次后,該日志文件描述符記錄緩存中,默認為1次 valid:設置檢查頻率 默認60s 案例: open_log_file_cache max=1000 inactive=20s min_uses=2 valid=1m; 四)Nginx日志切割配置 默認情況Nginx會把所有訪問日志生成到一個指定的訪問日志文件access.log,但如果這樣,時間久了就會導致日志文件非常龐大,不利于日志的分析和處理,因此有必要對nginx日志,按天和小時進行切割,分成不同的文件保存 #!/bin/bash Date=`date +%F` InstallDir="/usr/local/nginx" NginxLogDir="/vhosts/web1/logs" LogName="access_a" ##### [ -d $NginxLogDir ] && cd $NginxLogDir || exit 1 [ -f ${LogName}.log ]|| exit 1 #Cut logs by day /bin/mv ${LogName}.log ${LogName}_${Date}.log $InstallDir/sbin/nginx -s reload #Delete logs 7 days ago find . -ctime +7 -name "*.log"|xargs rm -f 00 00 * * * /bin/bash /server/scripts/cut_nginx_log.sh >/dev/null 2>&1 1)分析截止到目前,當天訪問量最高的ip排行 [root@test logs]# awk '{print $1}' 91als.access_2017-12-15.log | sort |uniq -c|sort -nr|head -10 42636 "106.120.160.75" 40419 "106.120.161.65" 368 "101.226.162.89" 363 "125.88.222.250" 335 "123.125.80.235" 278 "113.89.70.105" 276 "144.76.8.134" 232 "113.89.68.65" 194 "106.120.168.109" 2)分析從早上9點至中午12點總的訪問量 sed -n "/2017:09:00/,/2016:12:00/"p access_log|wc -l 3) 找出當前日志中502或者404錯誤的頁面并統計
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