Serverless
function as a service
backend as a service
stateless
short lived
api gateway trigger/event trigger -> event driven
auto scaled /scaled to zero
reduced cost
stateless: 没有任何session的信息，每次执行都是一样的结果，没有前后依赖关系。
Knative
k8s-based
0-1启动
event-driven
source code - > run container
Serving
runtime组件，管理，运行serverless的container
take care of networking, autoscaling and revision(version) tracking
Eventing
事件的定义，订阅和触发
Networking
Ingress
TLS
Building（tekton）
gitub source code build into container image
