onestraw / vagrant-nginx-keepalived

Demo of Nginx high availability using Keepalived and Vagrant

Vagrant-nginx-keepalived

Demo of Nginx high availability using Vagrant

• Active-passive
• Active-active

Prerequisites

1. Install Vagrant
2. Install Virtualbox
3. Clone this repo with git clone https://github.com/onestraw/vagrant-nginx-keepalived.git

Keepalived split-brain 脑裂问题

指在一个高可用（HA）系统中，当联系着的两个节点断开联系时，本来为一个整体的系统，分裂为两个独立节点，这时两个节点开始争抢共享资源，结果会导致系统混乱，数据损坏。

对于无状态服务的HA，无所谓脑裂不脑裂；但对有状态服务(比如MySQL)的HA，必须要严格防止脑裂。（但有些生产环境下的系统按照无状态服务HA的那一套去配置有状态服务，结果可想而知...）

Reference material

• Vagrant
• VirtualBox
• Keepalived
• Vagrant-haproxy-keepalived