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README
Apache-2.0

[TOC]

解决方案介绍

该解决方案基于开源软件LVS+Keepalived构建,快速帮助用户在华为云(或边缘小站)弹性云服务器上完成高可用负载均衡部署。LVS节点主备部署,提供负载均衡能力,Keepalived提供健康检查和故障转移能力,提高系统的可用性。适用于如下场景:

  • Web集群
  • 数据库集群
  • 分布式缓存服务器

解决方案实践详情页面地址:https://www.huaweicloud.com/solution/implementations/build-high-availability-four-layer-load-balancing.html

架构图

方案架构

架构描述

该解决方案会部署如下资源:

  1. 创建两台Linux弹性云服务器,用于部署负载均衡业务系统。
  2. 创建虚拟IP,并分别绑定到两台弹性云服务器上,用于LVS云服务器主备切换。
  3. 创建弹性公网EIP,并绑定到虚拟IP上,用于提供对外访问服务。
  4. 在两台Linux弹性云服务器分别完成LVS和Keepalive软件的自动安装,以及高可用负载均衡环境配置。该方案采用LVS的FULLNAT模式配置。

组织结构

huaweicloud-solution-build-high-availability-four-layer-load-balancing
├── build-high-availability-four-layer-load-balancing.tf.json -- 华为云资源编排模板
├── build-high-availability-four-layer-load-balancing-for-IES.tf.json -- 边缘小站资源编排模板
├── userdata
    ├── configure-lvs-keepalived-master.sh  -- 负载均衡主服务器脚本配置文件
    ├── configure-lvs-keepalived-backup.sh  -- 负载均衡备服务器脚本配置文件
    ├── notify.sh  -- 负载均衡主备切换脚本配置文件

开始使用

1、重置密码

参考官网重置弹性云服务器密码,修改弹性云服务器初始化密码。

2、配置业务虚拟机环境

1.登录所有业务虚拟机环境,安装并配置httpd服务。执行以下命令:

[root@centos01 ~]# yum install -y httpd

[root@centos01 ~]# echo "www. test01. com" > /var/www/html/index.html

[root@centos01 ~]# chmod 777 /var/www/html/index.html

[root@centos01 ~]# systemctl start httpd

[root@centos01 ~]# systemctl enable httpd

注意第二行命令双引号中内容可以设置不一样,便于直观查看结果。

2.登录两台负载均衡主备服务器,查看被纳管的所有业务服务器状态。执行以下命令:

[root@lvs-matser ~]# ipvsadm -Ln

图1 纳管业务服务器状态

纳管业务服务器状态

如果ipvsadm返回的服务器数量和实际不符,请排查监听后端服务器端口是否放通。

3、访问高可用负载均衡环境

1.单击业务虚拟机所在的子网,单击“IP地址管理”,查看虚拟IP以及其绑定的弹性公网IP。

图2 虚拟IP及其绑定的公网IP

虚拟VIP及弹性公网EIP

2.在浏览器中多次访问虚拟IP挂载的公网IP,如:http://弹性公网IP。或在有公网访问能力的服务器多次curl虚拟IP绑定的弹性公网IP,如:curl VIP。后端云服务器web应用内容会随机轮询展示:www. test01. com 或 www. test02. com等。

图3 curl VIP绑定的EIP

curl VIP绑定的EIP

图4 访问VIP绑定的EIP

访问VIP绑定的EIP

4、参考部署指南释放负载均衡主备服务器绑定的公网IP。

5、上述步骤操作正常后,即可通过访问虚拟IP绑定的公网IP访问业务。

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简介

该方案基于开源软件LVS和Keepalived构建,快速帮助用户在华为云服务器上完成高可用负载均衡环境部署。 展开 收起
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