HAProxy安装与配置

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一、环境说明：
实验环境
192.168.133.136 proxy
192.168.133.137 web1
192.168.133.130 web2

官方地址：http://haproxy.1wt.eu/
下载地址:http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.24.tar.gz

二、软件安装
tar xzvf haproxy-1.4.24.tar.gz
make TARGET=linux26 PREFIX=/usr/local/haproxy
make install PREFIX=/usr/local/haproxy

三、创建配置文件

useradd haproxy -u 500

vim /etc/haproxy.cfg

global
        log 127.0.0.1 local3
        maxconn 20480
        chroot /usr/local/haproxy
        uid 500 #1004为haproxy 用户的uid ,haproxy用户需要自己手动创建
        gid 500
        daemon
        quiet
        nbproc 1
        pidfile /var/run/haproxy.pid
defaults
        log global
        mode http
        maxconn 20480
        option httplog
        option httpclose
        option forwardfor
        option dontlognull
        option redispatch
        retries 3
        balance roundrobin
        contimeout 5000
        clitimeout 50000
        srvtimeout 50000
listen web_poll 192.168.133.136:80
        mode http
        option httplog
        option dontlognull
        option logasap
        option forwardfor
        option httpclose
# option httpchk GET /index.html
server web1 192.168.133.137:80 cookie 1 check inter 2000 rise 3 fall 3
server web2 192.168.133.130:80 cookie 1 check inter 2000 rise 3 fall 3
listen status 192.168.133.136:8080
        stats enable
        stats uri /stats
        stats auth admin:123456
        stats realm (Haproxy\ statistic)

四、添加日志

vim /etc/rsyslog.conf
添加：
$ModLoad imudp
$UDPServerRun 514
local3.*                     /var/log/haproxy.log
local0.*                     /var/log/haproxy.log

vim /etc/sysconfig/rsyslog
修改：
SYSLOGD_OPTIONS="-c 2 -r -m 0"

/etc/init.d/rsyslog restart

五、创建haproxy启动脚本

vim /etc/init.d/haproxy

#!/bin/bash
#
# haproxy
#
# chkconfig: 35 85 15
# description: HAProxy is a free, very fast and reliable solution \
# offering high availability, load balancing, and \
# proxying for TCP and HTTP-based applications
# processname: haproxy
# config: /etc/haproxy.cfg
# pidfile: /var/run/haproxy.pid

# Source function library.
. /etc/rc.d/init.d/functions

# Source networking configuration.
. /etc/sysconfig/network

# Check that networking is up.
[ "$NETWORKING" = "no" ] && exit 0

config="/etc/haproxy.cfg"
exec="/usr/local/haproxy/sbin/haproxy"
prog=$(basename $exec)

[ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog

lockfile=/var/lock/subsys/haproxy

check() {
    $exec -c -V -f $config
}

start() {
    $exec -c -q -f $config
    if [ $? -ne 0 ]; then
        echo "Errors in configuration file, check with $prog check."
        return 1
    fi

    echo -n $"Starting $prog: "
    # start it up here, usually something like "daemon $exec"
    daemon $exec -D -f $config -p /var/run/$prog.pid
    retval=$?
    echo
    [ $retval -eq 0 ] && touch $lockfile
    return $retval
}

stop() {
    echo -n $"Stopping $prog: "
    # stop it here, often "killproc $prog"
    killproc $prog
    retval=$?
    echo
    [ $retval -eq 0 ] && rm -f $lockfile
    return $retval
}

restart() {
    $exec -c -q -f $config
    if [ $? -ne 0 ]; then
        echo "Errors in configuration file, check with $prog check."
        return 1
    fi
    stop
    start
}

reload() {
    $exec -c -q -f $config
    if [ $? -ne 0 ]; then
        echo "Errors in configuration file, check with $prog check."
        return 1
    fi
    echo -n $"Reloading $prog: "
    $exec -D -f $config -p /var/run/$prog.pid -sf $(cat /var/run/$prog.pid)
    retval=$?
    echo
    return $retval
}

force_reload() {
    restart
}

fdr_status() {
    status $prog
}

case "$1" in
    start|stop|restart|reload)
        $1
        ;;
    force-reload)
        force_reload
        ;;
    checkconfig)
        check
        ;;
    status)
        fdr_status
        ;;
    condrestart|try-restart)
      [ ! -f $lockfile ] || restart
    ;;
    *)
        echo $"Usage: $0 {start|stop|status|checkconfig|restart|try-restart|reload|force-reload}"
        exit 2
esac

chmod +x /etc/init.d/haproxy

六、启动

报错：
Starting haproxy: [ALERT] 177/105503 (18602) : Starting proxy cacti: cannot bind socket

产生这个错误可能有两个原因：
1）没有加入内核参数 (net.ipv4.ip_nonlocal_bind=1)
2）端口冲突

vim /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind=1  （最后一行添加）

sysctl -p（重新加载）


查看状态页面
http://192.168.133.136:8080/stats



测试：
打开http:192.168.133.136
可以轮询到两个web服务器上。