haproxy源码编译安装

haproxy源码安装：

下载地址:http://www.haproxy.org/

tar xf haproxy-1.7.7.tar.gz
cd haproxy-1.7.7
make TARGET=linux26  && make install
cp /usr/local/sbin/haproxy /usr/sbin/haproxy
cp examples/haproxy.init /etc/init.d/haproxy
chmod +x /etc/init.d/haproxy
mkdir -p /etc/haproxy
cp examples/content-sw-sample.cfg /etc/haproxy/haproxy.cfg
chkconfig --add haproxy
service haproxy start

配置分段：

global
    配置参数：log,maxconn,...，应用程序，性能，调试
proxies
    defaults:定义frontend与backend常用属性
    frontend:定义前端，用来接受用户请求，根据用户请求调度至后端
    backend:定义后端，用来定义后端服务器属性，
    listen:关联了前后端，不用分开定义

balance调度算法:

roundrobin:基于权重进行轮叫，动态算法，运行时调整，每个后端服务器最多接收4128个连接。
static-rr:基于权重进行轮叫，静态算法，后端服务器连接数上无限制
leastconn:新的连接请求被派发至后端连接最少的服务器上，有这较长时间连接的应用场景使用，动态算法，运行时调整
source:将请求的源地址进行hash运算，除模取余，使得同一个客户端IP的请求始终发送至后端某特定服务器，
    hash-type:{map-based(除摸取余，静态)|consistent(一致性哈希法，动态)}

scheme://:@:/;?#
uri：;?#
uri左半部分：;
 uri:对URI的左半部分("问题"标记之前的部分)
     hash-type:{map-based|consistent}
url_param:根据url中指定参数的值，把值做hash计算，除以总权重
    hash-type:{map-based|consistent}
hdr():根据http首部的字段进行调度(UA,REFERER,HOSTNAME)
    hash-type:{map-based|consistent}
rdp-cookie:    rdp远程桌面协议
rdp-cookie(name):    rdp远程桌面协议

haproxy 1.5默认配置：

# /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:
    #
    # 1) configure syslog to accept network log events.  This is done
    #    by adding the '-r' option to the SYSLOGD_OPTIONS in
    #    /etc/sysconfig/syslog
    #
    # 2) 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

    chroot      /var/lib/haproxy
    pidfile     /var/run/haproxy.pid
    maxconn     4000
    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
    mode                    http
    log                     global
    option                  httplog
    option                  dontlognull
    option http-server-close
    option forwardfor       except 127.0.0.0/8
    option                  redispatch
    retries                 3
    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                 3000

#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend  main *:5000
    acl url_static       path_beg       -i /static /images /javascript /stylesheets
    acl url_static       path_end       -i .jpg .gif .png .css .js

    use_backend static          if url_static
    default_backend             app

frontend test *:80
    default_backend     testapp

backend testapp
    balance   roundrobin
    server    node2 192.168.3.6:80   check
    server    node3 192.168.2.33:80  check 

#---------------------------------------------------------------------
# static backend for serving up images, stylesheets and such
#---------------------------------------------------------------------
backend static
    balance     roundrobin
    server      static 127.0.0.1:4331 check

#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend app
    balance     roundrobin
    server  app1 127.0.0.1:5001 check
    server  app2 127.0.0.1:5002 check
    server  app3 127.0.0.1:5003 check
    server  app4 127.0.0.1:5004 check