之前做了一個Haproxy + Keealived 實現LDAP查詢代理的服務，感覺還不錯，決定用它代理公網Exchange請求。TMG不更新了，而且配置有點繁瑣，且動不動服務就死。
如果下文有地方看不懂，可以去我上一篇文章Haproxy+keepalived配置LDAP代理中去查看。
介紹一下架構：
用戶通過公網DNS，分別會被指向到聯通和電信的兩個出口上，兩個出口分別有兩個HAproxy代理服務器，通過Keepalived做熱備，虛擬出兩個VIP，VIP01和VIP02,訪問VIP01的用戶被分配到黃線所連的CAS服務器上，訪問VIP02的特殊用戶羣，被分配到藍線的VIPCAS服務器上,VIPCAS服務器只提供OWA服務。電信出口一樣，就不畫線了，亂的慌。
開始講解配置：
安裝需要的組件，keepalived和haproxy
yum install gcc kernel-headers kernel-devel yum install keepalived yum install haproxy
配置keepalived的配置文件：
vi /etc/keepalived/keepalived.conf
如下配置：
vrrp_scriptchk_http_port {
script"/etc/keepalived/check_haproxy.sh" #檢測haproxy健康狀態的腳本
interval 2
weight 2 }
vrrp_instanceVI_1 {
interface eth0
state MASTER #備機配置爲BACKUP
priority 101 #備機配置爲100
virtual_router_id 51 #keepalived組表示，同一組中的主機該值要一樣
smtp_alert
virtual_ipaddress {
x.x.x.1 #虛擬VIP01
x.x.x.2 #虛擬VIP02
}
track_script {
chk_http_port
}
}接下來編輯檢測Haprxoy健康的腳本：
vi /etc/keepalived/check_haproxy.sh #!/bin/bash A=`ps -C haproxy --no-header |wc -l` if [ $A -eq 0 ];then /etc/haproxy/haproxy -f /etc/haproxy/haproxy.cfg sleep 3 if [ `ps -C haproxy --no-header |wc -l` -eq 0 ];then /etc/init.d/keepalived stop fi fi chmod 755 /etc/keepalived/check_haproxy.sh
編輯Haproxy的配置文件：
vi /etc/haproxy/haproxy.cfg
配置文件如下：
global
log /dev/log local0 info
log /dev/log local0 notice
maxconn 4096
user root
group root
daemon
defaults
log global
maxconn 10000
contimeout 5000
clitimeout 3600000
srvtimeout 3600000
option redispatch
retries 3
frontend owa_redirect
mode http
bind 1.x.x.x:80
redirect location https://mail.contoso.com
frontend vipowa_redirect
mode http
bind 2.x.x.x:80
redirect location https://mailvip.contoso.com
frontend vipowa_443
mode tcp
bind 2.x.x.x:443
default_backend pool_vipowa
log global
option tcplog
backend pool_vipowa
balance roundrobin
option redispatch
option abortonclose
option persist
stick on src
stick-table type ip size 10240k expire 240m
server CASVIP01 x.x.x.1:443 check inter 5000 weight 1 rise 2 fall 3
server CASVIP02 x.x.x.2:443 check inter 5000 weight 1 rise 2 fall 3
frontend owa_443
mode tcp
bind 1.x.x.x:443
default_backend pool_owa
log global
option tcplog
backend pool_owa
balance roundrobin
option redispatch
option abortonclose
option persist
stick on src
stick-table type ip size 10240k expire 240m
server CAS00 x.x.x.0:443 check inter 5000 weight 1 rise 2 fall 3
server CAS01 x.x.x.1:443 check inter 5000 weight 1 rise 2 fall 3
server CAS02 x.x.x.2:443 check inter 5000 weight 1 rise 2 fall 3
server CAS03 x.x.x.3:443 check inter 5000 weight 1 rise 2 fall 3
frontend smtp_25
mode tcp
bind 1.x.x.x:25
default_backend pool_smtp
log global
option tcplog
backend pool_smtp
balance roundrobin
option redispatch
option abortonclose
option persist
stick on src
stick-table type ip size 10240k expire 240m
server CAS00 x.x.x.0:25 check inter 5000 weight 1 rise 2 fall 3
server CAS01 x.x.x.1:25 check inter 5000 weight 1 rise 2 fall 3
server CAS02 x.x.x.2:25 check inter 5000 weight 1 rise 2 fall 3
server CAS03 x.x.x.3:25 check inter 5000 weight 1 rise 2 fall 3
frontend pop_110
mode tcp
bind 1.x.x.x:110
default_backend pool_pop
log global
option tcplog
backend pool_pop
balance roundrobin
option redispatch
option abortonclose
option persist
stick on src
stick-table type ip size 10240k expire 240m
server CAS00 x.x.x.0:110 check inter 5000 weight 1 rise 2 fall 3
server CAS01 x.x.x.1:110 check inter 5000 weight 1 rise 2 fall 3
server CAS02 x.x.x.2:110 check inter 5000 weight 1 rise 2 fall 3
server CAS03 x.x.x.3:110 check inter 5000 weight 1 rise 2 fall 3
frontend vs_stats :8081
mode http
log global
option httplog
default_backend stats_backend
backend stats_backend
mode http
stats enable
stats uri /stats
stats auth admin:admin因爲配置文件中監聽了VIP的地址，所以如果當前服務器不是keepalived處於master狀態，VIP是不在網卡上的，那麼Haproxy無法啓動，這裏我們需要加一個參數，讓系統忽略本地沒有的IP地址：
vi /etc/sysctl.conf
打開該文件後，添加如下參數：
# For Haproxy can start with no local ip address net.ipv4.ip_nonlocal_bind=1
運行下面命令使參數生效：
sysctl -p
這樣系統會忽略本地不存在的IP地址
之後配置Haproxy的日誌：
vi /etc/rsyslog.conf
添加如下語句：
# Log for Haproxy local0.* /var/log/haproxy.log
重啓rsyslog：
service rsyslog restart
啓動Keepalived服務，會把Haproxy自動帶起來：
service keepalived start
將其設爲開機啓動：
chkconfig keepalived on
配置成功：
