HAProxy雙機高可用方案之HAProxy+Keepalived
環境：centos 5.4 x64
軟件版本：haproxy-1.3.26.tar.gz 、keepalived-1.2.7.tar.gz
網絡拓撲：
192.168.48.143
+-----------VIP----------+
| eth1 |
| |
Master Backup
192.168.48.139 192.168.48.140
+----------+ +----------+
| HAProxy | eth0 | HAProxy |
|keepalived|-------------|keepalived|
+----------+1.139 1.140+----------+
|
v
+--------+
| |
| |
v v eth1
+------+ +------+
| WEB1 | | WEB2 |
+------+ +------+
48.141 48.142
haproxy安裝
主頁：http://haproxy.1wt.eu/
下載地址：http://haproxy.1wt.eu/download/1.3/src/haproxy-1.3.26.tar.gz
[root@localhost tools]# wget http://haproxy.1wt.eu/download/1.3/src/haproxy-1.3.26.tar.gz
[root@localhost tools]# tar zxf haproxy-1.3.26.tar.gz
[root@localhost tools]# cd haproxy-1.3.26
[root@localhost haproxy-1.3.26]# make TARGET=linux26 PREFIX=/usr/local/haproxy
[root@localhost haproxy-1.3.26]# make install PREFIX=/usr/local/haproxy
[root@localhost haproxy-1.3.26]# cd /usr/local/haproxy/
[root@localhost haproxy]# mkdir conf
主備配置一樣
[root@localhost haproxy]# cat haproxy.cfg
global
log 127.0.0.1 local0
maxconn 65535
chroot /usr/local/haproxy
uid 99
gid 99
daemon
nbproc 2
#pidfile /usr/local/haproxy/haproxy.pid
debug
defaults
log 127.0.0.1 local3
mode http
option httplog
option httpclose
option dontlognull
option forwardfor
option redispatch
retries 2
maxconn 2000
# balance roundrobin
# stats uri /haproxy-stats
contimeout 5000
clitimeout 50000
srvtimeout 50000
frontend web_proxy
bind *:80
mode http
option httplog
log global
default_backend phppool
backend phppool
mode http
balance source
option httpchk HEAD /
server web1 192.168.48.141:80 check inter 2000
server web2 192.168.48.142:80 check inter 2000
listen web_ha
bind 0.0.0.0:8080
mode http
stats uri /haproxy-stats
stats hide-version
# stats realm Haproxy\statistics
stats auth gao:gao # 用戶名/密碼
haproxy啓動腳本
[root@ha139 sbin]# cat haproxy.sh
#!/bin/sh
# chkconfig 35 on
# description: HAProxy is a TCP/HTTP reverse proxy which is particularly suited for high availability environments.
# Source function library.
if [ -f /etc/init.d/functions ]; then
. /etc/init.d/functions
elif [ -f /etc/rc.d/init.d/functions ] ; then
. /etc/rc.d/init.d/functions
else
exit 0
fi
# Source networking configuration.
. /etc/sysconfig/network
# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0
[ -f /usr/local/haproxy/conf/haproxy.cfg ] || exit 1
RETVAL=0
start() {
/usr/local/haproxy/sbin/haproxy -c -q -f /usr/local/haproxy/conf/haproxy.cfg
if [ $? -ne 0 ]; then
echo "Errors found in configuration file."
return 1
fi
echo -n "Starting HAproxy: "
daemon /usr/local/haproxy/sbin/haproxy -D -f /usr/local/haproxy/conf/haproxy.cfg -p /var/run/haproxy.pid
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/haproxy
return $RETVAL
}
stop() {
echo -n "Shutting down HAproxy: "
killproc haproxy -USR1
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/haproxy
[ $RETVAL -eq 0 ] && rm -f /var/run/haproxy.pid
return $RETVAL
}
restart() {
/usr/local/haproxy/sbin/haproxy -c -q -f /usr/local/haproxy/conf/haproxy.cfg
if [ $? -ne 0 ]; then
echo "Errors found in configuration file, check it with 'haproxy check'."
return 1
fi
stop
start
}
check() {
/usr/local/haproxy/sbin/haproxy -c -q -V -f /usr/local/haproxy/conf/haproxy.cfg
}
rhstatus() {
status haproxy
}
condrestart() {
[ -e /var/lock/subsys/haproxy ] && restart || :
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
restart
;;
reload)
restart
;;
condrestart)
condrestart
;;
status)
rhstatus
;;
check)
check
;;
*)
echo $"Usage: haproxy {start|stop|restart|reload|condrestart|status|check}"
RETVAL=1
esac
exit $RETVAL
haproxy加日誌：
編輯/etc/syslog.conf文件， 添加內容如下：
local3.* /var/log/haproxy.log
local0.* /var/log/haproxy.log
編輯/etc/sysconfig/syslog文件，修改內容如下：
SYSLOGD_OPTIONS="-r -m 0"
然後重啓syslog服務，命令如下：
service syslog restart
keepalived安裝
主頁:www.keepalived.org
[root@localhost tools]# wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz
[root@ha tools]# tar zxf keepalived-1.2.7.tar.gz
[root@ha tools]# cd keepalived-1.2.7
[root@ha keepalived-1.2.7]# ./configure --prefix=/usr/local/keepalived
過程中出錯：
configure: error:
!!! OpenSSL is not properly installed on your system. !!!
!!! Can not include OpenSSL headers files. !!!
因爲openssl沒有安裝好
yum install -y openssl-devel
[root@ha keepalived-1.2.7]# make
[root@ha keepalived-1.2.7]# make install
keepalived做成服務模式啓動
[root@ha keepalived-1.2.7]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
[root@ha keepalived-1.2.7]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
[root@ha keepalived-1.2.7]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
[root@ha keepalived-1.2.7]# mkdir /etc/keepalived
[root@ha keepalived-1.2.7]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
主的配置文件
[root@ha keepalived-1.2.7]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_1
}
vrrp_script chk_haproxy {
script "/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
!state MASTER
state BACKUP
priority 100
advert_int 1
virtual_router_id 50
garp_master_delay 1
interface eth1
nopreempt
authentication {
auth_type PASS
auth_pass Kxiaokk345Pix
}
track_interface {
eth0
eth1
}
virtual_ipaddress {
192.168.48.143
}
track_script {
chk_haproxy
}
! Configuration File for keepalived
global_defs {
router_id LVS_1
}
vrrp_script chk_haproxy {
script "/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
!state MASTER
state BACKUP
priority 100
advert_int 1
virtual_router_id 50
garp_master_delay 1
interface eth1
nopreempt
authentication {
auth_type PASS
auth_pass Kxiaokk345Pix
}
track_interface {
eth0
eth1
}
virtual_ipaddress {
192.168.48.143
}
track_script {
chk_haproxy
}
!notify_master "/etc/keepalived/mailnotify.py master"
!notify_backup "/etc/keepalived/mailnotify.py backup"
!notify_fault "/etc/keepalived/mailnotify.py fault"
}
}
配置說明：
! Configuration File for keepalived
global_defs {
notification_email { #發生事件切換的時候，發送的郵箱，可以有多個，每行一個
[email protected]
}
notification_email_from [email protected] #指定發件人
smtp_server 127.0.0.1 #指定smtp服務器地址
smtp_connect_timeout 30 #指定smtp連接超時時間
router_id LVS_2 #運行keepalived機器的一個標識主備不能相同
}
#vrrp_script區域定義腳本名字和腳本執行的間隔和腳本執行的優先級變更
vrrp_script check_haproxy {
#定義監控nginx的命令，命令的$?返回1就改變優先級。
script "/etc/keepalived/check_haproxy.sh"
interval 5 #腳本執行間隔
weight -10 #腳本結果1導致的優先級變更：10表示優先級+10；-10則表示優先級-10
fall 2 # 檢測幾次返回1爲失敗
rise 1 # 檢測幾次返回0成功爲ok
}
#VIP
vrrp_instance VI_1 { #監控多個網段的實例
state BACKUP #全部服務器都設爲BACKUP，讓優先級高的自動爲master
# dont track primary #忽略VRRP的interface錯誤
track_interface {
eth0 #跟蹤接口，設置額外的監控，裏面任意一塊網卡出現問題，都會進入故障(FAULT)狀態
eth1
}
interface eth0 #實例綁定的網卡
mcast_src_ip 192.168.48.139 #指定主或備的eth0的Ip
virtual_router_id 51 #這裏非常重要，相同的VRID爲一個組
priority 100 #優先級，
advert_int 1 #檢查間隔，默認1s
# nopreempt #不設置搶佔，優先級高就做master，當主恢復時不搶佔。nopreempt //master 設置爲BACKUP ，通過priority來判斷哪成爲主，設置nopreempt 是可以在MASTER 出現問題修復好後不搶用vip，直接充當slave的角色。這樣，可以確保session不會丟失
authentication { #認證
auth_type PASS #認證的方式，支持PASS和AH
auth_pass 123 #認證的密碼
}
track_interface { #設置監聽本機的接口
eth0
eth1
}
virtual_ipaddress { #指定漂移地址（VIP)
192.168.48.143 #如果有多個VIP，繼續換行填寫
}
track_script { #執行定義的命令
check_haproxy
}
}
haproxy檢測腳本
[root@ha139 keepalived]# cat check_haproxy.sh
#!/bin/bash
#
# desc: check haproxy service
#
A=`ip address show eth1 | grep 192.168.48.143 | wc -l`
B=`ps -C haproxy --no-heading | wc -l`
if [ $A -eq 1 ]; then
if [ $B -eq 0 ]; then
/usr/local/haproxy/sbin/haproxy.sh start
sleep 3
fi
fi
主或備服務要求搶佔：不要配置nopreempt
track_interface配置監聽沒有配置時，如果是多網卡，只能監控之中的一張網卡。
track_interface配置同時監聽本機的eth0,eth1時，兩張網卡之中的一張有問題，vip就會漂移
track_interface配置分別監聽本機的eth0或eth1時，只是監聽指定的本機網卡有問題時，vip纔會漂移
主不要求搶佔：加nopreempt，做到主不搶佔，優先級高就做master，當主恢復時不搶佔。//master 設置爲BACKUP ，通過priority來判斷哪成爲主，設置nopreempt 是可以在MASTER 出現問題修復好後不搶用vip，直接充當slave的角色。這樣，可以確保session不會丟失
搶佔問題處理：http://bbs.linuxtone.org/thread-6788-1-1.html
高可用（keepalived+haproxy）切換測試：（兩臺機）
主或備斷eth0或eth1網卡，看能否漂移，是否搶佔。
主或備關keepaviled，看能否漂移。
軟件版本：haproxy-1.3.26.tar.gz 、keepalived-1.2.7.tar.gz
網絡拓撲：
192.168.48.143
+-----------VIP----------+
| eth1 |
| |
Master Backup
192.168.48.139 192.168.48.140
+----------+ +----------+
| HAProxy | eth0 | HAProxy |
|keepalived|-------------|keepalived|
+----------+1.139 1.140+----------+
|
v
+--------+
| |
| |
v v eth1
+------+ +------+
| WEB1 | | WEB2 |
+------+ +------+
48.141 48.142
haproxy安裝
主頁：http://haproxy.1wt.eu/
下載地址：http://haproxy.1wt.eu/download/1.3/src/haproxy-1.3.26.tar.gz
[root@localhost tools]# wget http://haproxy.1wt.eu/download/1.3/src/haproxy-1.3.26.tar.gz
[root@localhost tools]# tar zxf haproxy-1.3.26.tar.gz
[root@localhost tools]# cd haproxy-1.3.26
[root@localhost haproxy-1.3.26]# make TARGET=linux26 PREFIX=/usr/local/haproxy
[root@localhost haproxy-1.3.26]# make install PREFIX=/usr/local/haproxy
[root@localhost haproxy-1.3.26]# cd /usr/local/haproxy/
[root@localhost haproxy]# mkdir conf
主備配置一樣
[root@localhost haproxy]# cat haproxy.cfg
global
log 127.0.0.1 local0
maxconn 65535
chroot /usr/local/haproxy
uid 99
gid 99
daemon
nbproc 2
#pidfile /usr/local/haproxy/haproxy.pid
debug
defaults
log 127.0.0.1 local3
mode http
option httplog
option httpclose
option dontlognull
option forwardfor
option redispatch
retries 2
maxconn 2000
# balance roundrobin
# stats uri /haproxy-stats
contimeout 5000
clitimeout 50000
srvtimeout 50000
frontend web_proxy
bind *:80
mode http
option httplog
log global
default_backend phppool
backend phppool
mode http
balance source
option httpchk HEAD /
server web1 192.168.48.141:80 check inter 2000
server web2 192.168.48.142:80 check inter 2000
listen web_ha
bind 0.0.0.0:8080
mode http
stats uri /haproxy-stats
stats hide-version
# stats realm Haproxy\statistics
stats auth gao:gao # 用戶名/密碼
haproxy啓動腳本
[root@ha139 sbin]# cat haproxy.sh
#!/bin/sh
# chkconfig 35 on
# description: HAProxy is a TCP/HTTP reverse proxy which is particularly suited for high availability environments.
# Source function library.
if [ -f /etc/init.d/functions ]; then
. /etc/init.d/functions
elif [ -f /etc/rc.d/init.d/functions ] ; then
. /etc/rc.d/init.d/functions
else
exit 0
fi
# Source networking configuration.
. /etc/sysconfig/network
# Check that networking is up.
[ ${NETWORKING} = "no" ] && exit 0
[ -f /usr/local/haproxy/conf/haproxy.cfg ] || exit 1
RETVAL=0
start() {
/usr/local/haproxy/sbin/haproxy -c -q -f /usr/local/haproxy/conf/haproxy.cfg
if [ $? -ne 0 ]; then
echo "Errors found in configuration file."
return 1
fi
echo -n "Starting HAproxy: "
daemon /usr/local/haproxy/sbin/haproxy -D -f /usr/local/haproxy/conf/haproxy.cfg -p /var/run/haproxy.pid
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && touch /var/lock/subsys/haproxy
return $RETVAL
}
stop() {
echo -n "Shutting down HAproxy: "
killproc haproxy -USR1
RETVAL=$?
echo
[ $RETVAL -eq 0 ] && rm -f /var/lock/subsys/haproxy
[ $RETVAL -eq 0 ] && rm -f /var/run/haproxy.pid
return $RETVAL
}
restart() {
/usr/local/haproxy/sbin/haproxy -c -q -f /usr/local/haproxy/conf/haproxy.cfg
if [ $? -ne 0 ]; then
echo "Errors found in configuration file, check it with 'haproxy check'."
return 1
fi
stop
start
}
check() {
/usr/local/haproxy/sbin/haproxy -c -q -V -f /usr/local/haproxy/conf/haproxy.cfg
}
rhstatus() {
status haproxy
}
condrestart() {
[ -e /var/lock/subsys/haproxy ] && restart || :
}
# See how we were called.
case "$1" in
start)
start
;;
stop)
stop
;;
restart)
restart
;;
reload)
restart
;;
condrestart)
condrestart
;;
status)
rhstatus
;;
check)
check
;;
*)
echo $"Usage: haproxy {start|stop|restart|reload|condrestart|status|check}"
RETVAL=1
esac
exit $RETVAL
haproxy加日誌：
編輯/etc/syslog.conf文件， 添加內容如下：
local3.* /var/log/haproxy.log
local0.* /var/log/haproxy.log
編輯/etc/sysconfig/syslog文件，修改內容如下：
SYSLOGD_OPTIONS="-r -m 0"
然後重啓syslog服務，命令如下：
service syslog restart
keepalived安裝
主頁:www.keepalived.org
[root@localhost tools]# wget http://www.keepalived.org/software/keepalived-1.2.7.tar.gz
[root@ha tools]# tar zxf keepalived-1.2.7.tar.gz
[root@ha tools]# cd keepalived-1.2.7
[root@ha keepalived-1.2.7]# ./configure --prefix=/usr/local/keepalived
過程中出錯：
configure: error:
!!! OpenSSL is not properly installed on your system. !!!
!!! Can not include OpenSSL headers files. !!!
因爲openssl沒有安裝好
yum install -y openssl-devel
[root@ha keepalived-1.2.7]# make
[root@ha keepalived-1.2.7]# make install
keepalived做成服務模式啓動
[root@ha keepalived-1.2.7]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
[root@ha keepalived-1.2.7]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
[root@ha keepalived-1.2.7]# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
[root@ha keepalived-1.2.7]# mkdir /etc/keepalived
[root@ha keepalived-1.2.7]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
主的配置文件
[root@ha keepalived-1.2.7]# cat /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
router_id LVS_1
}
vrrp_script chk_haproxy {
script "/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
!state MASTER
state BACKUP
priority 100
advert_int 1
virtual_router_id 50
garp_master_delay 1
interface eth1
nopreempt
authentication {
auth_type PASS
auth_pass Kxiaokk345Pix
}
track_interface {
eth0
eth1
}
virtual_ipaddress {
192.168.48.143
}
track_script {
chk_haproxy
}
! Configuration File for keepalived
global_defs {
router_id LVS_1
}
vrrp_script chk_haproxy {
script "/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
!state MASTER
state BACKUP
priority 100
advert_int 1
virtual_router_id 50
garp_master_delay 1
interface eth1
nopreempt
authentication {
auth_type PASS
auth_pass Kxiaokk345Pix
}
track_interface {
eth0
eth1
}
virtual_ipaddress {
192.168.48.143
}
track_script {
chk_haproxy
}
!notify_master "/etc/keepalived/mailnotify.py master"
!notify_backup "/etc/keepalived/mailnotify.py backup"
!notify_fault "/etc/keepalived/mailnotify.py fault"
}
}
配置說明：
! Configuration File for keepalived
global_defs {
notification_email { #發生事件切換的時候，發送的郵箱，可以有多個，每行一個
[email protected]
}
notification_email_from [email protected] #指定發件人
smtp_server 127.0.0.1 #指定smtp服務器地址
smtp_connect_timeout 30 #指定smtp連接超時時間
router_id LVS_2 #運行keepalived機器的一個標識主備不能相同
}
#vrrp_script區域定義腳本名字和腳本執行的間隔和腳本執行的優先級變更
vrrp_script check_haproxy {
#定義監控nginx的命令，命令的$?返回1就改變優先級。
script "/etc/keepalived/check_haproxy.sh"
interval 5 #腳本執行間隔
weight -10 #腳本結果1導致的優先級變更：10表示優先級+10；-10則表示優先級-10
fall 2 # 檢測幾次返回1爲失敗
rise 1 # 檢測幾次返回0成功爲ok
}
#VIP
vrrp_instance VI_1 { #監控多個網段的實例
state BACKUP #全部服務器都設爲BACKUP，讓優先級高的自動爲master
# dont track primary #忽略VRRP的interface錯誤
track_interface {
eth0 #跟蹤接口，設置額外的監控，裏面任意一塊網卡出現問題，都會進入故障(FAULT)狀態
eth1
}
interface eth0 #實例綁定的網卡
mcast_src_ip 192.168.48.139 #指定主或備的eth0的Ip
virtual_router_id 51 #這裏非常重要，相同的VRID爲一個組
priority 100 #優先級，
advert_int 1 #檢查間隔，默認1s
# nopreempt #不設置搶佔，優先級高就做master，當主恢復時不搶佔。nopreempt //master 設置爲BACKUP ，通過priority來判斷哪成爲主，設置nopreempt 是可以在MASTER 出現問題修復好後不搶用vip，直接充當slave的角色。這樣，可以確保session不會丟失
authentication { #認證
auth_type PASS #認證的方式，支持PASS和AH
auth_pass 123 #認證的密碼
}
track_interface { #設置監聽本機的接口
eth0
eth1
}
virtual_ipaddress { #指定漂移地址（VIP)
192.168.48.143 #如果有多個VIP，繼續換行填寫
}
track_script { #執行定義的命令
check_haproxy
}
}
haproxy檢測腳本
[root@ha139 keepalived]# cat check_haproxy.sh
#!/bin/bash
#
# desc: check haproxy service
#
A=`ip address show eth1 | grep 192.168.48.143 | wc -l`
B=`ps -C haproxy --no-heading | wc -l`
if [ $A -eq 1 ]; then
if [ $B -eq 0 ]; then
/usr/local/haproxy/sbin/haproxy.sh start
sleep 3
fi
fi
主或備服務要求搶佔：不要配置nopreempt
track_interface配置監聽沒有配置時，如果是多網卡，只能監控之中的一張網卡。
track_interface配置同時監聽本機的eth0,eth1時，兩張網卡之中的一張有問題，vip就會漂移
track_interface配置分別監聽本機的eth0或eth1時，只是監聽指定的本機網卡有問題時，vip纔會漂移
主不要求搶佔：加nopreempt，做到主不搶佔，優先級高就做master，當主恢復時不搶佔。//master 設置爲BACKUP ，通過priority來判斷哪成爲主，設置nopreempt 是可以在MASTER 出現問題修復好後不搶用vip，直接充當slave的角色。這樣，可以確保session不會丟失
搶佔問題處理：http://bbs.linuxtone.org/thread-6788-1-1.html
高可用（keepalived+haproxy）切換測試：（兩臺機）
主或備斷eth0或eth1網卡，看能否漂移，是否搶佔。
主或備關keepaviled，看能否漂移。
併發測試
webbench最多可以模擬3萬個併發連接去測試網站的負載能力，個人感覺要比Apache自帶的ab壓力測試工具好，安裝使用也特別方便。
wget http://blog.s135.com/soft/linux/webbench/webbench-1.5.tar.gz
tar zxvf webbench-1.5.tar.gz
cd webbench-1.5
make &&mkdir -p /usr/local/man&& make install
使用：
webbench -c 500 -t 30 http://192.168.48.143
參數說明：-c表示併發數，-t表示時間(秒)
haproxy參考資料
http://network.51cto.com/art/201110/295955.htm HAProxy雙機高可用方案之HAProxy+Keepalived(1)
http://dngood.blog.51cto.com/446195/738634 haproxy 安裝與配置 （有配置說明）
http://os.51cto.com/art/201202/317741_2.htm HAProxy配置語法及實例(3）（有配置說明）
http://hi.baidu.com/gaolongquan/item/51a8f6c68f44ad61f7c95db0 HAProxy+Keepalived
http://xukaizijian.blog.163.com/blog/static/17043311920115283358709/ web] Haproxy配置（有配置說明）
http://blog.51cto.com/zt/232 HAProxy 能夠做些什麼？51cto專題
keepalived參考資料
http://xzregg.blog.51cto.com/3829250/976793 ngnix+keepalived 實現N主高可用負載均衡web羣集 (有配置說明)
http://www.jb51.net/os/RedHat/55468.html haproxy+keepalived 負載均衡之主備切換
http://bbs.linuxtone.org/thread-6788-1-1.html vip搶佔問題處理
http://www.tumblr.com/tagged/keepalived HAProxy + KeepAlived構建高可用的反向代理系統(帶併發測試)
webbench最多可以模擬3萬個併發連接去測試網站的負載能力，個人感覺要比Apache自帶的ab壓力測試工具好，安裝使用也特別方便。
wget http://blog.s135.com/soft/linux/webbench/webbench-1.5.tar.gz
tar zxvf webbench-1.5.tar.gz
cd webbench-1.5
make &&mkdir -p /usr/local/man&& make install
使用：
webbench -c 500 -t 30 http://192.168.48.143
參數說明：-c表示併發數，-t表示時間(秒)
haproxy參考資料
http://network.51cto.com/art/201110/295955.htm HAProxy雙機高可用方案之HAProxy+Keepalived(1)
http://dngood.blog.51cto.com/446195/738634 haproxy 安裝與配置 （有配置說明）
http://os.51cto.com/art/201202/317741_2.htm HAProxy配置語法及實例(3）（有配置說明）
http://hi.baidu.com/gaolongquan/item/51a8f6c68f44ad61f7c95db0 HAProxy+Keepalived
http://xukaizijian.blog.163.com/blog/static/17043311920115283358709/ web] Haproxy配置（有配置說明）
http://blog.51cto.com/zt/232 HAProxy 能夠做些什麼？51cto專題
keepalived參考資料
http://xzregg.blog.51cto.com/3829250/976793 ngnix+keepalived 實現N主高可用負載均衡web羣集 (有配置說明)
http://www.jb51.net/os/RedHat/55468.html haproxy+keepalived 負載均衡之主備切換
http://bbs.linuxtone.org/thread-6788-1-1.html vip搶佔問題處理
http://www.tumblr.com/tagged/keepalived HAProxy + KeepAlived構建高可用的反向代理系統(帶併發測試)
http://blog.s135.com/post/288/ 併發測試