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HAproxy增加日志记录功能和自定义日志输出内容、格式
一.增加haproxy日志记录功能
1.1 由于数据分析的需要，我们必须打开haproxy日志，记录相关信息。
在配置前，我们先来了解一下日志的level:local0～local7 16～23保留为本地使用
emerg 0 系统不可用
alert 1 必须马上采取行动的事件
crit 2 关键的事件
err 3 错误事件
warning 4 警告事件
notice 5 普通但重要的事件
info 6 有用的信息
debug 7 调试信息
1.2 实际配置：
########################################
vi haproxy.conf(在default处添加如下信息)
defaults
log global
option httplog
log 127.0.0.1 local3
########################################
#######################################
vi /etc/rsyslog.conf(添加如下内容)
local3.* /data/logs/haproxy.log
#######################################
#######################################
vi /etc/sysconfig/rsyslog
把SYSLOGD_OPTIONS="-m 0"
改成 SYSLOGD_OPTIONS="-r -m 0 -c 2"
#######################################
相关解释说明:
-r:打开接受外来日志消息的功能,其监控514 UDP端口;
-x:关闭自动解析对方日志服务器的FQDN信息,这能避免DNS不完整所带来的麻烦;
-m:修改syslog的内部mark消息写入间隔时间(0为关闭),例如240为每隔240分钟写入一次"--MARK--"信息;
-h:默认情况下,syslog不会发送从远端接受过来的消息到其他主机,而使用该选项,则把该开关打开,所有
接受到的信息都可根据syslog.conf中定义的@主机转发过去
配置完毕后重启rsyslogd和haproxy即可.
日志内容如下：
Sep 18 15:48:11 localhost haproxy[12124]: Proxy html-server started. Sep 18 15:48:11 localhost haproxy[12124]: Proxy html-server started. Sep 18 15:48:29 localhost haproxy[12125]: 10.69.112.139:59244 [18/Sep/2016:15:48:29.027] http-in html-server/html-A 0/0/0/0/0 200 254 - - --NI 0/0/0/0/0 0/0 "GET / HTTP/1.1" Sep 18 15:48:29 localhost haproxy[12125]: 10.69.112.139:59244 [18/Sep/2016:15:48:29.027] http-in html-server/html-A 0/0/0/0/0 200 254 - - --NI 0/0/0/0/0 0/0 "GET / HTTP/1.1" Sep 18 15:48:29 localhost haproxy[12125]: 10.69.112.139:59244 [18/Sep/2016:15:48:29.027] http-in html-server/html-A 0/0/0/0/0 200 254 - - --NI 0/0/0/0/0 0/0 "GET / HTTP/1.1"
但日志可读性很差，我们需要显示更多的信息，但默认的都捕获不到，只能自定义需要显示的内容了。
二.定义haproxy日志输出内容和格式
2.1自定义haproxy日志。直接上配置文件。
global log 127.0.0.1 local3 info maxconn 4096 chroot /gomeo2o/haproxy uid haproxy gid haproxy daemon nbproc 1 description haproxy pidfile /var/run/haproxy.pid defaults log global # option httplog balance roundrobin mode http maxconn 4096 retries 3 option redispatch option forceclose option dontlognull option abortonclose stats uri /haproxy frontend http-in bind 0.0.0.0:80 mode http log global option httplog option httpclose acl html url_reg -i \.html$ use_backend html-server if html default_backend html-server #(( capture request header Host len 64 capture request header User-Agent len 128 capture request header X-Forwarded-For len 100 capture request header Referer len 200 capture response header Server len 40 capture response header Server-ID len 40 #capture捕获信息 log-format %ci:%cp\ %si:%sp\ %B\ %U\ %ST\ %r\ %b\ %f\ %bi\ %hrl\ %hsl #log-forcat定义日志需显示内容(变量) #利用capture捕获信息，log-forcat定义变量 #详解请见2.1和2.2 #)) backend html-server mode http balance roundrobin option httpchk GET /index.html cookie SERVERID insert indirect nocache server html-A 10.69.112.150:80 weight 1 cookie 3 check inter 2000 rise 2 fall 5 server html-B 10.69.112.148:80 weight 1 cookie 4 check inter 2000 rise 2 fall 5
其他参数在此不做过多解释，主要查看两个中括号之间的内容。
2.2 capture捕获
haproxy利用capture捕获请求(request)和响应(response)信息，具体需捕获内容可以做如下操作：
用浏览器访问一个网站(我用的google),比如www.gomeplus.com,按F12，内容如下(注意我红色框起来的部分)：
找到response headers项，这里就是你可以捕获的信息。比如捕获server和server-id：
capture response header Server len 40 capture response header Server-ID len 40
备注：2.1配置文件当中的capture基本的信息都能捕获到了，如有特别需求，请查阅官网(capture到底能捕获多少信息，多详细，我也在查询当中)。
2.3 定义log-format变量
定义示例：
log-format %T\ %t\ Some\ Text
log-format %{+Q}o\ %t\ %s\ %{-Q}r请参阅下面的表为定义的变量(转自官方文档)：
+---+------+-----------------------------------------------+-------------+ | R | var | field name (8.2.2 and 8.2.3 for description) | type | +---+------+-----------------------------------------------+-------------+ | | %o | special variable, apply flags on all next var | | +---+------+-----------------------------------------------+-------------+ | | %B | bytes_read (from server to client) | numeric | | H | %CC | captured_request_cookie | string | | H | %CS | captured_response_cookie | string | | | %H | hostname | string | | H | %HM | HTTP method (ex: POST) | string | | H | %HP | HTTP request URI without query string (path) | string | | H | %HQ | HTTP request URI query string (ex: ?bar=baz) | string | | H | %HU | HTTP request URI (ex: /foo?bar=baz) | string | | H | %HV | HTTP version (ex: HTTP/1.0) | string | | | %ID | unique-id | string | | | %ST | status_code | numeric | | | %T | gmt_date_time | date | | | %Tc | Tc | numeric | | | %Td | Td = Tt - (Tq + Tw + Tc + Tr) | numeric | | | %Tl | local_date_time | date | | H | %Tq | Tq | numeric | | H | %Tr | Tr | numeric | | | %Ts | timestamp | numeric | | | %Tt | Tt | numeric | | | %Tw | Tw | numeric | | | %U | bytes_uploaded (from client to server) | numeric | | | %ac | actconn | numeric | | | %b | backend_name | string | | | %bc | beconn (backend concurrent connections) | numeric | | | %bi | backend_source_ip (connecting address) | IP | | | %bp | backend_source_port (connecting address) | numeric | | | %bq | backend_queue | numeric | | | %ci | client_ip (accepted address) | IP | | | %cp | client_port (accepted address) | numeric | | | %f | frontend_name | string | | | %fc | feconn (frontend concurrent connections) | numeric | | | %fi | frontend_ip (accepting address) | IP | | | %fp | frontend_port (accepting address) | numeric | | | %ft | frontend_name_transport (‘~‘ suffix for SSL) | string | | | %lc | frontend_log_counter | numeric | | | %hr | captured_request_headers default style | string | | | %hrl | captured_request_headers CLF style | string list | | | %hs | captured_response_headers default style | string | | | %hsl | captured_response_headers CLF style | string list | | | %ms | accept date milliseconds (left-padded with 0) | numeric | | | %pid | PID | numeric | | H | %r | http_request | string | | | %rc | retries | numeric | | | %rt | request_counter (HTTP req or TCP session) | numeric | | | %s | server_name | string | | | %sc | srv_conn (server concurrent connections) | numeric | | | %si | server_IP (target address) | IP | | | %sp | server_port (target address) | numeric | | | %sq | srv_queue | numeric | | S | %sslc| ssl_ciphers (ex: AES-SHA) | string | | S | %sslv| ssl_version (ex: TLSv1) | string | | | %t | date_time (with millisecond resolution) | date | | | %ts | termination_state | string | | H | %tsc | termination_state with cookie status | string | +---+------+-----------------------------------------------+-------------+
最后查看定义之后的日志内容输出：
Sep 20 17:06:12 localhost haproxy[16372]: 10.69.112.139:39957 10.69.112.148:80 2614 179 200 GET / HTTP/1.1 html-server http-in 10.69.112.151 www.qiang999.com curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2 - - nginx/1.9.8 -Sep 20 17:06:12 localhost haproxy[16372]: 10.69.112.139:39957 10.69.112.148:80 2614 179 200 GET / HTTP/1.1 html-server http-in 10.69.112.151 www.qiang999.com curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2 - - nginx/1.9.8 -Sep 20 17:06:12 localhost haproxy[16372]: 10.69.112.139:39966 10.69.112.150:80 254 179 200 GET / HTTP/1.1 html-server http-in 10.69.112.151 www.qiang999.com curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2 - - nginx/1.9.8 -Sep 20 17:06:12 localhost haproxy[16372]: 10.69.112.139:39966 10.69.112.150:80 254 179 200 GET / HTTP/1.1 html-server http-in 10.69.112.151 www.qiang999.com curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2 - - nginx/1.9.8 -Sep 20 17:06:13 localhost haproxy[16372]: 10.69.112.139:39974 10.69.112.148:80 2614 179 200 GET / HTTP/1.1 html-server http-in 10.69.112.151 www.qiang999.com curl/7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.19.1 Basic ECC zlib/1.2.3 libidn/1.18 libssh2/1.4.2 - - nginx/1.9.8 -\
本文出自 “Eric” 博客，谢绝转载！
HAproxy增加日志记录功能和自定义日志输出内容、格式
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