【Haproxy】开启日志记录
至于为什么开启日志记录，即使我不说，你们这群老司机也懂。开启日志分割，主要涉及到两个知识点：
①HAproxy关于日志记录的配置
②Rsyslog的配置
环境：
CentOS6.5
haproxy-1.6.11
配置日志记录的前提是HAproxy可以正常使用，操作者熟悉Haproxy的配置文件
配置HAproxy的日志记录选项
# vim /etc/haproxy/haproxy.cfg
defaults
log global ##开启全局日志，对所有池子生效
log 127.0.0.1:514 local3 ##将3级别日志信息发送到本机514端口的rsyslog程序
:wq! 创建Haproxy日志存储的文件
# mkdir -p /var/log/haproxy/
# touch /var/log/haproxy/haproxy.log 配置Rsyslog配置，开启514端口的侦听
# vim /etc/rsyslog.conf
$ModLoad imudp #默认是注释，将注释去掉
$UDPServerRun 514 #默认是注释，将注释去掉
local3.* /var/log/haproxy/haproxy.log ##添加一行该信息，该信息的local3要和ha里面的相对应
##后面的便是你希望haproxy的日志存储到哪里，指定文件 检查rsyslog是否开启监听
# netstat -tunlp|grep 514
udp 0 0 0.0.0.0:514 0.0.0.0:* 2615/rsyslogd
udp 0 0 :::514 :::* 2615/rsyslogd 重启两个服务服务
# service rsyslog restart
Shutting down system logger:
Starting system logger:
# service haproxy restart
Shutting down haproxy:
Starting haproxy: 测试日志是否开始记录
# tail -f /var/log/haproxy/haproxy.log
Sep 26 10:56:40 localhost haproxy: Stopping proxy stats in 0 ms.
Sep 26 10:56:40 localhost haproxy: Stopping frontend dev_posp in 0 ms.
Sep 26 10:56:40 localhost haproxy: Stopping backend dev_posp in 0 ms.
Sep 26 10:56:40 localhost haproxy: Proxy stats stopped (FE: 0 conns, BE: 0 conns).
Sep 26 10:56:40 localhost haproxy: Proxy dev_posp stopped (FE: 6 conns, BE: 0 conns).
Sep 26 10:56:40 localhost haproxy: Proxy dev_posp stopped (FE: 0 conns, BE: 6 conns).
Sep 26 10:56:40 localhost haproxy: Proxy stats started.
Sep 26 10:56:40 localhost haproxy: Proxy dev_posp started.
Sep 26 10:56:40 localhost haproxy: Proxy dev_posp started.
Sep 26 10:57:01 localhost haproxy: Connect from 192.168.222.1:57057 to 192.168.222.130:80 (dev_posp/TCP)
Sep 26 10:57:01 localhost haproxy: Connect from 192.168.222.1:57058 to 192.168.222.130:80 (dev_posp/TCP)
技巧根据不同的需求来打印不同的日志级别
日志级别有local0~local7
#define KERN_EMERG ""/* system is unusable */
#define KERN_ALERT ""/* action must be taken immediately */
#define KERN_CRIT ""/* critical conditions */
#define KERN_ERR ""/* error conditions */
#define KERN_WARNING""/* warning conditions */
#define KERN_NOTICE ""/* normal but significant condition */
#define KERN_INFO ""/* informational */
#define KERN_DEBUG ""/* debug-level messages */
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