LVS负载均衡报错Can't initialize ipvs: Protocol not available

wgkgood

LVS是目前最主流的负载均衡软件，几乎8-90%的互联网公司都是使用开源免费的LVS作为公司的web前端接入，在这里非常感谢LVS作者章文嵩博士无私的奉献。
那很多同学在安装完LVS+keepalived后出现如下错误？
Can't initialize ipvs: Protocol not available
Can't initialize ipvs: Protocol not available
Can't initialize ipvs: Protocol not available
Can't initialize ipvs: Protocol not available
Can't initialize ipvs: Protocol not available
Can't initialize ipvs: Protocol not available
Can't initialize ipvs: Protocol not available