LVS-DR+Keepalived網站服務器雙機熱備配置

keepalived是一個類似於layer3, 4 & 7交換機制的軟件，也就是我們平時說的第3層、第4層和第7層交換。Keepalived是自動完成，不需人工干涉。
調度服務器：
需要在LVS的基礎上面做。
參考上兩節：
負載均衡羣集之一LVS-DR：https://blog.51cto.com/13572519/2084197
負載均衡羣集之—LVS-NAT：https://blog.51cto.com/13572519/2084181

一塊網卡：
Vmnet1：192.168.80.100
主與從調度器上都做下面的3步的：加載、安裝ipvsadm包
下載地址：http://www.keepalived.org/download.html
[root@lss ~]# modprobe ip_vs
[root@lss ~]# rpm -ivh /mnt/Packages/ipvsadm-1.27-7.el7.x86_64.rpm
---------keepalived安裝配置（主、從都要配置的）----
[root@lss ~]# yum -y install popt-devel kernel-devel openssl-devel
WinSCP上傳keepalived到主從服務器

[root@lss ~]# tar fx keepalived-1.4.2.tar.gz -C /opt
[root@lss opt]# cd /opt/keepalived-1.4.2/
[root@lss keepalived-1.4.2]# yum -y install \
gcc \
gcc-c++ \
make
[root@lss keepalived-1.4.2]# ./configure --prefix=/
[root@lss keepalived-1.4.2]# make && make install
[root@lss keepalived]# cp -r /opt/keepalived-1.4.2/keepalived/etc/keepalived/ /etc/init.d
[root@lss keepalived]# systemctl enable keepalived
--------------------------------修改配置文件（主調度器）-------------
[root@lss keepalived]# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {br/>[email protected]
[email protected]br/>[email protected]
}
notification_email_from [email protected]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_01
}

vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51
priority 110
advert_int 1
authentication {
auth_type PASS
auth_pass 6666
}
virtual_ipaddress {
192.168.80.188
}
}
virtual_server 192.168.80.188 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 60
protocol TCP
real_server 192.168.80.101 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
real_server 192.168.80.102 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
[root@lss keepalived]# service keepalived start
[root@lss keepalived]# ip addr show dev ens33 //驗證綁定了虛擬地址
inet 192.168.80.188/32 scope global ens33
[root@lss keepalived]# ipvsadm -L
[root@lss keepalived]# tail -f /var/log/messages //對業務服務器和主調度器進行關閉驗證熱備及健康檢查效果。
MASTER STATE代表主服務器
BACKUP STATE代表備用服務器

---------------------------------修改配置文件（從調度器）-----------------
[root@LSS03 ~]# modprobe ip_vs
[root@LSS03 ~]# rpm -ivh /mnt/Packages/ipvsadm-1.27-7.el7.x86_64.rpm
[root@LSS03 ~]# yum -y install \
gcc \
gcc-c++ \
make
[root@LSS03 ~]# tar fx keepalived-1.4.2.tar.gz -C /opt
[root@LSS03 ~]# cd /opt/keepalived-1.4.2/
[root@LSS03 keepalived-1.4.2]# ./configure --prefix=/
[root@LSS03 keepalived-1.4.2]# make && make install
[root@LSS03 keepalived-1.4.2]# cp -r keepalived/etc/init.d/keepalived /etc/init.d/
[root@LSS03 keepalived-1.4.2]# systemctl enable keepalived
[root@LSS03 keepalived-1.4.2]# vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived

global_defs {
notification_email {
[email protected]
}
notification_email_from benet [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_02 //主從要不相同
}

vrrp_instance VI_1 {
state BACKUP //從調度器的熱備狀態
interface ens33
virtual_router_id 51 //編號主與從的兩邊要一樣的
priority 105 //從調度器的優先級
advert_int 1
authentication { //主、從熱備認證信息
auth_type PASS
auth_pass 6666
}
virtual_ipaddress { //指定羣集VIP地址（虛擬服務器地址），可以指定多個的
192.168.80.188
}
}

virtual_server 192.168.80.188 80 { //虛擬服務器地址（VIP）、端口
delay_loop 6 //健康檢查的間隔時間（秒）正常情況下。
lb_algo rr //輪詢（rr）調度算法
lb_kind DR //直接路由（DR）羣集工作模式
persistence_timeout 60 //連接保持時間，（秒），若註釋掉加個"!"在這個時間內同一客戶端的請求被同一服務器處理
protocol TCP //應用服務採用的是TCP協議

real_server 192.168.80.101 80 { //第一個web節點的地址、端口
weight 1 //節點的權重
TCP_CHECK { //健康檢查方式
connect_port 80 //檢查的目標端口
connect_timeout 3 //連接超時（秒）
nb_get_retry 3 //重試次數
delay_before_retry 3 //重試間隔（秒）
}
}
real_server 192.168.80.102 80 { //第二個web節點的地址、端口
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}
[root@LSS03 keepalived-1.4.2]# service keepalived start
[root@LSS03 keepalived-1.4.2]# ip addr show dev ens33
[root@LSS03 keepalived-1.4.2]# tail -f /var/log/messages
MASTER STATE代表主服務器
BACKUP STATE代表備用服務器

以下是WEB服務器：
192.168.80.101服務器：
[root@lss01 ~]# yum install -y httpd
[root@lss01 ~]# vi /etc/httpd/conf/httpd.confServerName www.aa.com
[root@lss01 ~]# vi /var/www/html/index.html
<h1>Server aa </h1>

192.168.80.102服務器：
[root@lss02 ~]# yum install -y httpd
[root@lss02 ~]# vi /etc/httpd/conf/httpd.conf
ServerName www.bb.com
[root@lss02 ~]# vi /var/www/html/index.html
<h1>Server bb </h1>