haproxy安装及日志配置

1、yum安装

yum install haproxy -y

2、配置文件修改，经典配置

vim /etc/haproxy/haproxy.cfg

#---------------------------------------------------------------------
# Example configuration for a possible web application.  See the
# full configuration options online.
#
#   http://haproxy.1wt.eu/download/1.4/doc/configuration.txt
#
#---------------------------------------------------------------------

#---------------------------------------------------------------------
# Global settings
#---------------------------------------------------------------------
global
    # to have these messages end up in /var/log/haproxy.log you will
    # need to:
    #
    # ) configure syslog to accept network log events.  This is done
    #    by adding the '-r' option to the SYSLOGD_OPTIONS in
    #    /etc/sysconfig/syslog
    #
    # ) configure local2 events to go to the /var/log/haproxy.log
    #   file. A line like the following can be added to
    #   /etc/sysconfig/syslog
    #
    #    local2.*                       /var/log/haproxy.log
    #
    log         127.0.0.1 local2 info #日志配置，只记录正常访问日志
    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn
    user        haproxy
    group       haproxy
    daemon

    # turn on stats unix socket
    stats socket /var/lib/haproxy/stats

#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults 默认配置
    mode                    http
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/
    option                  redispatch
    retries
    timeout http-request    10s
    timeout queue           1m
    timeout connect         10s
    timeout client          1m
    timeout server          1m
    timeout http-keep-alive 10s
    timeout check           10s
    maxconn                 

#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------

#---------------------------------------------------------------------
# static backend for serving up images, stylesheets and such
#---------------------------------------------------------------------
# round robin balancing between the various backends
frontend web_lb  前台
    bind *:
    stats uri /ha_stats
    default_backend web_back

backend web_back 后台负载均衡
    balance roundrobin
    server 101web 10.10.90.101: check weight
    server 102web 10.10.90.102: check weight 

3、如何打开日志记录

# to have these messages end up in /var/log/haproxy.log you will
    # need to:
    #
    # ) configure syslog to accept network log events.  This is done
    #    by adding the '-r' option to the SYSLOGD_OPTIONS in
    #    /etc/sysconfig/syslog
    #
    # ) configure local2 events to go to the /var/log/haproxy.log
    #   file. A line like the following can be added to
    #   /etc/sysconfig/syslog
    #
    #    local2.*                       /var/log/haproxy.log

1）修改/etc/sysconfig/syslog中的SYSLOGD_OPTIONS选项内容，添加-r
2）修改/etc/rsyslog.conf添加文件位 local2.*                       /var/log/haproxy.log
3）开启udp日志接收，修改/etc/rsyslog.conf

# Provides UDP syslog reception
$ModLoad imudp
$UDPServerRun 514

4）修改完这些配置重启haproxy和rsyslog服务