--------------------------------------------------------------------------------------------------------------------------
關(guān)閉 SElinux、配置防火墻（Haproxy_Keepalived_Master 和 Haproxy_Keepalived_Backup兩臺機(jī)器都要操作）
[root@Haproxy_Keepalived_Master ~]# vim /etc/sysconfig/selinux
#SELINUX=enforcing #注釋掉
#SELINUXTYPE=targeted #注釋掉
SELINUX=disabled #增加
[root@Haproxy_Keepalived_Master ~]# setenforce 0 #臨時關(guān)閉selinux。上面文件配置后，重啟機(jī)器后就永久生效。
注意下面182.148.15.0/24是服務(wù)器的公網(wǎng)網(wǎng)段，192.168.1.0/24是服務(wù)器的私網(wǎng)網(wǎng)段
一定要注意：加上這個組播規(guī)則后，MASTER和BACKUP故障時，才能實現(xiàn)VIP資源的正常轉(zhuǎn)移。其故障恢復(fù)后，VIP也還會正常轉(zhuǎn)移回來。
[root@Haproxy_Keepalived_Master ~]# vim /etc/sysconfig/iptables
.......
-A INPUT -s 182.148.15.0/24 -d 224.0.0.18 -j ACCEPT #允許組播地址通信。
-A INPUT -s 192.168.1.0/24 -d 224.0.0.18 -j ACCEPT
-A INPUT -s 182.148.15.0/24 -p vrrp -j ACCEPT #允許 VRRP（虛擬路由器冗余協(xié)）通信
-A INPUT -s 192.168.1.0/24 -p vrrp -j ACCEPT
-A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT
[root@Haproxy_Keepalived_Master ~]# /etc/init.d/iptables restart
----------------------------------------------------------------------------------------------------------------------
下載Haproxy地址：http://www.haproxy.org/download/1.6/src/
1）安裝Haproxy（Haproxy_Keepalived_Master 和 Haproxy_Keepalived_Backup兩臺機(jī)器都要操作） 注意：安裝之前，先執(zhí)行yum install gcc gcc-c++ make openssl-devel kernel-devel
[root@Haproxy_Keepalived_Master src]# wget http://www.haproxy.org/download/1.6/src/haproxy-1.6.12.tar.gz
[root@Haproxy_Keepalived_Master src]# tar -zvxf haproxy-1.6.12.tar.gz
[root@Haproxy_Keepalived_Master src]# cd haproxy-1.6.12
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# make TARGET=linux26 CPU=x86_64 PREFIX=/usr/local/haprpxy USE_OPENSSL=1 ADDLIB=-lz
參數(shù)說明：
TARGET=linux26 #使用 uname -r 查看內(nèi)核，如：2.6.32-642.el6.x86_64，此時該參數(shù)就為linux26
CPU=x86_64 #使用 uname -r 查看系統(tǒng)信息，如 x86_64 GNU/Linux，此時該參數(shù)就為 x86_64
PREFIX=/usr/local/haprpxy #haprpxy 安裝路徑
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# ldd haproxy | grep ssl
libssl.so.10 => /usr/lib64/libssl.so.10 (0x00007f6f3d9b2000)
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# make install PREFIX=/usr/local/haproxy
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# mkdir -p /usr/local/haproxy/conf
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# mkdir -p /etc/haproxy
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# cp /usr/local/src/haproxy-1.6.12/examples/option-http_proxy.cfg /usr/local/haproxy/conf/haproxy.cfg
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# ln -s /usr/local/haproxy/conf/haproxy.cfg /etc/haproxy/haproxy.cfg
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# cp -r /usr/local/src/haproxy-1.6.12/examples/errorfiles /usr/local/haproxy/errorfiles
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# ln -s /usr/local/haproxy/errorfiles /etc/haproxy/errorfiles
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# mkdir -p /usr/local/haproxy/log
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# touch /usr/local/haproxy/log/haproxy.log
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# ln -s /usr/local/haproxy/log/haproxy.log /var/log/haproxy.log
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# cp /usr/local/src/haproxy-1.6.12/examples/haproxy.init /etc/rc.d/init.d/haproxy
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# chmod +x /etc/rc.d/init.d/haproxy
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# chkconfig haproxy on
[root@Haproxy_Keepalived_Master haproxy-1.6.12]# ln -s /usr/local/haproxy/sbin/haproxy /usr/sbin
2）配置 haproxy.cfg 參數(shù)（Haproxy_Keepalived_Master 和 Haproxy_Keepalived_Backup兩臺機(jī)器都要操作）
[root@Haproxy_Keepalived_Master ~]# cp /usr/local/haproxy/conf/haproxy.cfg /usr/local/haproxy/conf/haproxy.cfg.bak
[root@Haproxy_Keepalived_Master ~]# vim /usr/local/haproxy/conf/haproxy.cfg
global
log 127.0.0.1 local3 info #在本機(jī)記錄日志
maxconn 65535 #每個進(jìn)程可用的最大連接數(shù)
chroot /usr/local/haproxy #haproxy 安裝目錄
uid 99 #運(yùn)行haproxy的用戶uid（cat /etc/passwd 查看，這里是nobody的uid）
gid 99 #運(yùn)行haproxy的用戶組id（cat /etc/passwd 查看，這里是nobody組id）
daemon #以后臺守護(hù)進(jìn)程運(yùn)行
defaults
log global
mode http #運(yùn)行模式 tcp、 http、 health
retries 3 #三次連接失敗，則判斷服務(wù)不可用
option redispatch #如果后端有服務(wù)器宕機(jī)，強(qiáng)制切換到正常服務(wù)器
stats uri /haproxy #統(tǒng)計頁面 URL 路徑
stats refresh 30s #統(tǒng)計頁面自動刷新時間
stats realm haproxy-status #統(tǒng)計頁面輸入密碼框提示信息
stats auth admin:dxInCtFianKtL]36 #統(tǒng)計頁面用戶名和密碼
stats hide-version #隱藏統(tǒng)計頁面上 HAProxy 版本信息
maxconn 65535 #每個進(jìn)程可用的最大連接數(shù)
timeout connect 5000 #連接超時
timeout client 50000 #客戶端超時
timeout server 50000 #服務(wù)器端超時
frontend http-in #自定義描述信息
mode http #運(yùn)行模式 tcp、 http、 health
maxconn 65535 #每個進(jìn)程可用的最大連接數(shù)
bind :80 #監(jiān)聽 80 端口
log global
option httplog
option httpclose #每次請求完畢后主動關(guān)閉 http 通道
acl is_a hdr_beg(host) -i www.wangshibo.com #規(guī)則設(shè)置，-i 后面是要訪問的域名
acl is_b hdr_beg(host) -i www.guohuihui.com #如果多個域名，就寫多個規(guī)則，一規(guī)則對應(yīng)一個域名；即后面有多個域名，就寫 is_c、 is-d….，這個名字可以隨意起。但要與下面的use_backend 對應(yīng)
use_backend web-server if is_a #如果訪問 is_a 設(shè)置的域名，就負(fù)載均衡到下面backend 設(shè)置的對應(yīng) web-server 上。web-server所負(fù)載的域名要都部署到下面的web01和web02上。如果是不同的域名部署到不同的機(jī)器上，就定義不同的web-server。
use_backend web-server if is_b
backend web-server
mode http
balance roundrobin #設(shè)置負(fù)載均衡模式，source 保存 session 值，roundrobin 輪詢模式
cookie SERVERID insert indirect nocache
option httpclose
option forwardfor
server web01 182.148.15.233:80 weight 1 cookie 3 check inter 2000 rise 2 fall 5
server web02 182.148.15.238:80 weight 1 cookie 4 check inter 2000 rise 2 fall 5
注意參數(shù)解釋：inter 2000 心跳檢測時間；rise 2 三次連接成功，表示服務(wù)器正常；fall 5 三次連接失敗，表示服務(wù)器異常； weight 1 權(quán)重設(shè)置
3）啟動haproxy（Haproxy_Keepalived_Master 和 Haproxy_Keepalived_Backup兩臺機(jī)器都要操作）
[root@Haproxy_Keepalived_Master ~]# service haproxy start #啟動
[root@Haproxy_Keepalived_Master ~]# service haproxy stop #關(guān)閉
[root@Haproxy_Keepalived_Master ~]# service haproxy restart #重啟
[root@Haproxy_Keepalived_Master ~]# service haproxy status #查看服務(wù)狀態(tài)
4）設(shè)置HAProxy日志（Haproxy_Keepalived_Master 和 Haproxy_Keepalived_Backup兩臺機(jī)器都要操作）
[root@Haproxy_Keepalived_Master ~]# vim /etc/rsyslog.conf
.......
$ModLoad imudp #取消注釋 ，這一行不注釋，日志就不會寫
$UDPServerRun 514 #取消注釋 ，這一行不注釋，日志就不會寫
.......
local0.* /var/log/haproxy.log #這一行可以沒有，可以不用寫
local3.* /var/log/haproxy.log #這一行必須要寫
[root@Haproxy_Keepalived_Master ~]# vim /etc/sysconfig/rsyslog
SYSLOGD_OPTIONS="-r -m 0" #接收遠(yuǎn)程服務(wù)器日志
[root@Haproxy_Keepalived_Master ~]# service rsyslog restart
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1）安裝Keepalived（Haproxy_Keepalived_Master 和 Haproxy_Keepalived_Backup兩臺機(jī)器都要操作）
[root@Haproxy_keepalived_Master ~]# yum install -y openssl-devel
[root@Haproxy_keepalived_Master ~]# cd /usr/local/src/
[root@Haproxy_keepalived_Master src]# wget http://www.keepalived.org/software/keepalived-1.3.5.tar.gz
[root@Haproxy_keepalived_Master src]# tar -zvxf keepalived-1.3.5.tar.gz
[root@Haproxy_keepalived_Master src]# cd keepalived-1.3.5
[root@Haproxy_keepalived_Master keepalived-1.3.5]# ./configure --prefix=/usr/local/keepalived
[root@Haproxy_keepalived_Master keepalived-1.3.5]# make && make install
[root@Haproxy_keepalived_Master keepalived-1.3.5]# cp /usr/local/src/keepalived-1.3.5/keepalived/etc/init.d/keepalived /etc/rc.d/init.d/
[root@Haproxy_keepalived_Master keepalived-1.3.5]# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
[root@Haproxy_keepalived_Master keepalived-1.3.5]# mkdir /etc/keepalived/
[root@Haproxy_keepalived_Master keepalived-1.3.5]# cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
[root@Haproxy_keepalived_Master keepalived-1.3.5]# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
[root@Haproxy_keepalived_Master keepalived-1.3.5]# echo "/etc/init.d/keepalived start" >> /etc/rc.local
[root@Haproxy_keepalived_Master keepalived-1.3.5]# chmod +x /etc/rc.d/init.d/keepalived #添加執(zhí)行權(quán)限
[root@Haproxy_keepalived_Master keepalived-1.3.5]# chkconfig keepalived on #設(shè)置開機(jī)啟動
[root@Haproxy_keepalived_Master keepalived-1.3.5]# service keepalived start #啟動
[root@Haproxy_keepalived_Master keepalived-1.3.5]# service keepalived stop #關(guān)閉
[root@Haproxy_keepalived_Master keepalived-1.3.5]# service keepalived restart #重啟
2）Haproxy_Keepalived_Master服務(wù)器上的Keepalived配置如下：
[root@Haproxy_Keepalived_Master ~]# cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf-bak
[root@Haproxy_Keepalived_Master ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id HAproxy237
}
vrrp_script chk_haproxy { #HAproxy 服務(wù)監(jiān)控腳本
script "/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_haproxy
}
virtual_ipaddress {
182.148.15.239
}
notify_master "/etc/keepalived/clean_arp.sh 182.148.15.239"
}
vrrp_instance VI_2 {
state BACKUP
interface eth0
virtual_router_id 52
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
182.148.15.235
}
notify_master "/etc/keepalived/clean_arp.sh 182.148.15.235"
}
3）Haproxy_Keepalived_Backup服務(wù)器上的Keepalived配置如下：
[root@Haproxy_Keepalived_Backup ~]# /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf-bak
[root@Haproxy_Keepalived_Backup ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
root@localhost
}
notification_email_from keepalived@localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id HAproxy236
}
vrrp_script chk_haproxy {
script "/etc/keepalived/check_haproxy.sh"
interval 2
weight 2
}
vrrp_instance VI_1 {
state BACKUP
interface eth0
virtual_router_id 51
priority 99
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
track_script {
chk_haproxy
}
virtual_ipaddress {
182.148.15.239
}
notify_master "/etc/keepalived/clean_arp.sh 182.148.15.239"
}
vrrp_instance VI_2 {
state MASTER
interface eth0
virtual_router_id 52
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
182.148.15.235
}
notify_master "/etc/keepalived/clean_arp.sh 182.148.15.235"
}
4）設(shè)置HAproxy服務(wù)監(jiān)控腳本（Haproxy_Keepalived_Master 和 Haproxy_Keepalived_Backup兩臺機(jī)器都要操作）
[root@Haproxy_Keepalived_Master ~]# vim /etc/keepalived/check_haproxy.sh
#!/bin/bash
A=`ps -C haproxy --no-header | wc -l`
if [ $A -eq 0 ];then
/etc/init.d/haproxy start
sleep 3
if [ `ps -C haproxy --no-header | wc -l ` -eq 0 ];then
/etc/init.d/keepalived stop
fi
fi
[root@Haproxy_Keepalived_Master ~]# chmod +x /etc/keepalived/check_haproxy.sh
5）設(shè)置更新虛擬服務(wù)器（VIP）地址的arp記錄到網(wǎng)關(guān)腳本（Haproxy_Keepalived_Master 和 Haproxy_Keepalived_Backup兩臺機(jī)器都要操作）
[root@Haproxy_Keepalived_Master ~]# vim /etc/keepalived/clean_arp.sh
#!/bin/sh
VIP=$1
GATEWAY=182.148.15.254 #這個是本機(jī)的外網(wǎng)網(wǎng)卡網(wǎng)關(guān)地址
/sbin/arping -I eth0 -c 5 -s $VIP $GATEWAY &>/dev/null
6）系統(tǒng)內(nèi)核優(yōu)化（Haproxy_Keepalived_Master 和 Haproxy_Keepalived_Backup兩臺機(jī)器都要操作）
[root@Haproxy_Keepalived_Master ~]# echo 1024 60999 > /proc/sys/net/ipv4/ip_local_port_range
[root@Haproxy_Keepalived_Master ~]# echo 30 > /proc/sys/net/ipv4/tcp_fin_timeout
[root@Haproxy_Keepalived_Master ~]# echo 4096 > /proc/sys/net/ipv4/tcp_max_syn_backlog
[root@Haproxy_Keepalived_Master ~]# echo 262144 > /proc/sys/net/ipv4/tcp_max_tw_buckets
[root@Haproxy_Keepalived_Master ~]# echo 262144 > /proc/sys/net/ipv4/tcp_max_orphans
[root@Haproxy_Keepalived_Master ~]# echo 300 > /proc/sys/net/ipv4/tcp_keepalive_time
[root@Haproxy_Keepalived_Master ~]# echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle
[root@Haproxy_Keepalived_Master ~]# echo 0 > /proc/sys/net/ipv4/tcp_timestamps
[root@Haproxy_Keepalived_Master ~]# echo 0 > /proc/sys/net/ipv4/tcp_ecn
[root@Haproxy_Keepalived_Master ~]# echo 1 > /proc/sys/net/ipv4/tcp_sack
[root@Haproxy_Keepalived_Master ~]# echo 0 > /proc/sys/net/ipv4/tcp_dsack
7）分別啟動Haproxy_Keepalived_Master 和 Haproxy_Keepalived_Backup的keealived和haproxy服務(wù)，并查看vip
[root@Haproxy_Keepalived_Master ~]# /etc/init.d/keepalived start
[root@Haproxy_Keepalived_Master ~]# /etc/init.d/haproxy start
[root@Haproxy_Keepalived_Master ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 52:54:00:68:dc:b6 brd ff:ff:ff:ff:ff:ff
inet 182.148.15.237/27 brd 182.148.15.255 scope global eth0
inet 182.148.15.239/32 scope global eth0
inet6 fe80::5054:ff:fe68:dcb6/64 scope link
valid_lft forever preferred_lft forever
[root@Haproxy_Keepalived_Backup ~]# /etc/init.d/keepalived start
[root@Haproxy_Keepalived_Backup ~]# /etc/init.d/haproxy start
[root@Haproxy_Keepalived_Backup ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 52:54:00:7c:b8:f0 brd ff:ff:ff:ff:ff:ff
inet 182.148.15.236/27 brd 182.148.15.255 scope global eth0
inet 182.148.15.235/32 scope global eth0
inet6 fe80::5054:ff:fe7c:b8f0/64 scope link
valid_lft forever preferred_lft forever
