高可用haproxy调度后端服务器实现动静分离集群架构

Posted 2020-12-25

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了高可用haproxy调度后端服务器实现动静分离集群架构相关的知识，希望对你有一定的参考价值。

项目要求：

(1) 动静分离部署wordpress，动静都要能实现负载均衡，要注意会话的问题；

(2) 设计拓扑；

(3) haproxy的设计要求：

(a) stats page，要求仅能通过本地访问使用管理接口；

(b) 动静分离；

(4) haproxy高可用；

项目需求：
（1）要实现haproxy高可用，可利用keepalived主备高可用两个haproxy服务器；
（2）动态web集群【实现负载均衡，项目实验中使用两台即可】；
（3）静态web集群【实现负载均衡，项目实验中使用两台即可】；
使用CentOS 7.5镜像虚拟机完成项目试验：
wordpress服务器 172.16.75.1 进行NFS共享给集群
haproxy1 172.16.75.2
haproxy2 172.16.75.2
动态web集群 172.16.75.4 172.16.75.5
静态web集群 172.16.75.6 172.16.75.7

设计拓扑：
技术分享图片

一、两台haproxy主配置文件配置
~]#cp /etc/haproxy/haproxy.cfg /etc/haproxy/haproxy.cfg.bck //进行备份防止改错是吧，每次我们在更改主配置文件时最好备份
~]# vim /etc/haproxy/haproxy.cfg //两台haproxy主机设置是相同的
技术分享图片
先将原先配置文件中maxconn这行以下的内容删除，然后添加图示内容即可；
~]# systemctl start haproxy //确保之前没有开启httpd服务，此条命令执行后ss -tnl可以看到5000端口打开，查看状态，正常开启即可

二、keepalive配置
haproxy1 172.16.75.3 //要保证这两台haproxy的时间是同步的，且将防火墙以及SElinux关闭
~]# hostnamectl set-hostname drct1
~]# vim /etc/keepalived/keepalived.conf
global_defs {
notification_email {br/>[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id drct1
vrrp_mcast_group4 224.0.100.18
}

vrrp_script check_httpd {
script "killall -0 haproxy && exit 0 || exit 1"
interval 1
notification_email {br/>[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id drct1
vrrp_mcast_group4 224.0.100.18
}

vrrp_script check_httpd {
script "killall -0 haproxy && exit 0 || exit 1"
interval 1
weight -20
}
vrrp_instance VI_1 {
state MASTER
interface ens33
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
nopreempt
}

virtual_ipaddress {
    172.16.72.1
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"

}
[[email protected] ~]# vim /etc/keepalived/notify.sh

#!/bin/bash br/>#
CONTACT=‘[email protected]‘
notify() {
MAILSUBJECT="$(hostname) changed state to $1, VIP reflact."
MAILBODY="$(date +‘%F %T‘): VRRP STATUS CHANGED, $(hostname) change state to $1"
echo "$MAILBODY" | mail -s "$MAILSUBJECT" "$CONTACT"
}

case $1 in
master)
notify MASTER
;;
backup)
notify BACKUP
if ! killall -0 haproxy ; then
systemctl start haproxy
fi
;;
fault)
notify FAULT
;;
*)
echo "Usage: $(basename $0) { master | backup | fault}"
;;
esac
~]# systemctl start keepalived

haproxy2 172.16.75.4 //注意文件路径呦
~]# hostnamectl set-hostname drct2
keepalived]# vim keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {br/>[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id drct2
vrrp_mcast_group4 224.0.100.18
}
vrrp_script check_httpd {
script "killall -0 haproxy && exit 0 || exit 1"
interval 1
weight -20
vrrp_instance VI_1 {
state BACKUP
interface ens33
virtual_router_id 51
priority 90
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
nopreempt
}
virtual_ipaddress {
172.16.72.1
}
notify_master "/etc/keepalived/notify.sh master"
notify_backup "/etc/keepalived/notify.sh backup"
notify_fault "/etc/keepalived/notify.sh fault"

}
drct2 keepalived]# vim notify.sh

#!/bin/bash
#

CONTACT=‘[email protected]‘
notify() {
MAILSUBJECT="$(hostname) changed state to $1, VIP reflact."
MAILBODY="$(date +‘%F %T‘): VRRP STATUS CHANGED, $(hostname) change state to $1"
echo "$MAILBODY" | mail -s "$MAILSUBJECT" "$CONTACT"
}

case $1 in
master)
notify MASTER
;;
backup)
notify BACKUP
if ! killall -0 haproxy ; then
systemctl start haproxy
fi