keepalived + lvs + nginx 主備配置案例
1、結構
2、主備修改內核參數
net.ipv4.ip_forward = 1
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
註:如果遇到提示是缺少包，yum 安裝即可
3、啟動keepalived
[root@iZ256w2hluuZ keepalived-1.3.5]# ./sbin/keepalived -f /usr/local/keepalived/etc/keepalived.conf
4、修改配置文件
1 > 192.168.1.109 vrrp-master-config
global_defs { #全局定義模塊
notification_email {[email protected]
br/>[email protected]
br/>[email protected]
notification_email_from [email protected]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
vrrp_skip_check_adv_addr
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_instance VI_1 { #vrrp 實例
state MASTER #主master
interface eth0
virtual_router_id 51
priority 200
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.50 #vip 浮動的虛擬ip
}
}
virtual_server 192.168.1.50 80 { #虛擬ip
delay_loop 6 # 健康檢查時間，
lb_kind DR #DR模式
nat_mask 255.255.255.0
persistence_timeout 0
protocol TCP
real_server 192.168.1.111 80 { # 指定real server1的IP地址
weight 3 #權值，數字越大權重越高
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.1.112 80 { # 指定real server2的IP地址
weight 3 # 權值，數字越大權重越高
TCP_CHECK {
connect_timeout 10
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
2> 192.168.1.110 vrrp-slave-config: 把master的文件copy過來，其它不變
vrrp_instance VI_1 { #vrrp 實例要與master一致
state BACKUP #slave
interface eth0
virtual_router_id 51
priority 100 #優先級調低
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.1.50 #vip 浮動的虛擬ip
}
}
3> 狀態
vrrp 虛擬ip飄在master 109上:
把109的keepalived kill掉，vip會飄到備機110上
二、nginx 安裝
1>分別在192.168.1.111 , 192.168.1.112 上安裝，安裝httpd也可以
2> dr 模式需做特殊設置，創建腳本，並且start
[root@moban init.d]# cat realserver
#! /bin/bash
SNS_VIP=192.168.1.50
/etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
/sbin/route add -host $SNS_VIP dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $SNS_VIP >/dev/null 2>&1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "RealServer Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0
三、訪問測試，實現主備
wrr 輪循
keepalived + lvs + nginx 主備配置案例