fn quick start

fn quick start

Fn is an event-driven, open source, functions-as-a-service compute platform that you can run anywhere. Some of it's key features:

• Write once

  • Any language
  • AWS Lambda format supported

• Run anywhere

  • Public, private and hybrid cloud
  • Import functions directly from Lambda and run them wherever you want
• Easy to use for developers
• Easy to manage for operators
• Written in Go
• Simple yet powerful extensibility

1.安装fn

brew install fn

2. 升级docker

docker version

Client:
 Version:      17.09.0-ce
 API version:  1.32
 Go version:   go1.8.3
 Git commit:   afdb6d4
 Built:        Tue Sep 26 22:40:09 2017
 OS/Arch:      darwin/amd64

Server:
 Version:      17.09.0-ce
 API version:  1.32 (minimum version 1.12)
 Go version:   go1.8.3
 Git commit:   afdb6d4
 Built:        Tue Sep 26 22:45:38 2017
 OS/Arch:      linux/amd64
 Experimental: false

3. 登录docker hub

docker login

Username (feuyeux@gmail.com): feuyeux
Password:
Login Succeeded

4. 启动fn服务

 fn start
        ______
       / ____/___
      / /_  / __ \
     / __/ / / / /
    /_/   /_/ /_/
        v0.3.141

5. 撰写函数

mkdir hello
cd hello
vim func.go

package main

import (
  "fmt"
)

func main() {
  fmt.Println("Hello from Fn!")
}

6. 创建应用

fn init

        ______
       / ____/___
      / /_  / __ \
     / __/ / / / /
    /_/   /_/ /_/

Found go function, assuming go runtime.
func.yaml created.

7. 打包应用

fn run                                                                    

Building image feuyeux/hello:0.0.1
Sending build context to Docker daemon  4.096kB
Step 1/8 : FROM funcy/go:dev as build-stage
 ---> 4cccab7fc828
Step 2/8 : WORKDIR /function
 ---> Using cache
 ---> ba44eaaa14da
Step 3/8 : ADD . /go/src/func/
 ---> c6480ae51b4f
Step 4/8 : RUN cd /go/src/func/ && go build -o func
 ---> Running in ac0d2269aebb
 ---> 7ed8e8c8c7ba
Removing intermediate container ac0d2269aebb
Step 5/8 : FROM funcy/go
 ---> 573e8a7edc05
Step 6/8 : WORKDIR /function
 ---> Using cache
 ---> 00809f3fee14
Step 7/8 : COPY --from=build-stage /go/src/func/func /function/
 ---> Using cache
 ---> ee31e804adca
Step 8/8 : ENTRYPOINT ./func
 ---> Using cache
 ---> 5f32eff9e328
Successfully built 5f32eff9e328
Successfully tagged feuyeux/hello:0.0.1
Hello from Fn!

8. 部署应用

fn deploy --app myapp

Deploying hello to app: myapp at path: /hello
Bumped to version 0.0.2
Building image feuyeux/hello:0.0.2
Sending build context to Docker daemon  4.096kB
Step 1/8 : FROM funcy/go:dev as build-stage
 ---> 4cccab7fc828
Step 2/8 : WORKDIR /function
 ---> Using cache
 ---> ba44eaaa14da
Step 3/8 : ADD . /go/src/func/
 ---> 88ec5ca237e5
Step 4/8 : RUN cd /go/src/func/ && go build -o func
 ---> Running in e2247c834266
 ---> c787e9416655
Removing intermediate container e2247c834266
Step 5/8 : FROM funcy/go
 ---> 573e8a7edc05
Step 6/8 : WORKDIR /function
 ---> Using cache
 ---> 00809f3fee14
Step 7/8 : COPY --from=build-stage /go/src/func/func /function/
 ---> Using cache
 ---> ee31e804adca
Step 8/8 : ENTRYPOINT ./func
 ---> Using cache
 ---> 5f32eff9e328
Successfully built 5f32eff9e328
Successfully tagged feuyeux/hello:0.0.2
Pushing feuyeux/hello:0.0.2 to docker registry...The push refers to a repository [docker.io/feuyeux/hello]
b34434bfd239: Pushed
3d098239d19c: Pushed
e9474866f7d4: Pushed
c0e205d473e9: Pushed
0.0.2: digest: sha256:b88635814d7935e7a505133b167c3937663fa73344579790dea60877c13f5491 size: 1154
Updating route /hello using image feuyeux/hello:0.0.2...

9. 测试应用

curl http://localhost:8080/r/myapp/hello
Hello from Fn!

fn call myapp /hello
Hello from Fn!