goctl docker

概述

goctl docker 命令用于生成 Dockerfile 文件，用于构建 Docker 镜像。

goctl docker 指令

$ goctl docker --help
Generate Dockerfile
Usage:
  goctl docker [flags]
Flags:
      --base string      The base image to build the docker image, default scratch (default "scratch")
      --branch string    The branch of the remote repo, it does work with --remote
      --exe string       The executable name in the built image
      --go string        The file that contains main function
  -h, --help             help for docker
      --home string      The goctl home path of the template, --home and --remote cannot be set at the same time, if they are, --remote has higher priority
      --port int         The port to expose, default none
      --remote string    The remote git repo of the template, --home and --remote cannot be set at the same time, if they are, --remote has higher priority
                         The git repo directory must be consistent with the https://github.com/zeromicro/go-zero-template directory structure
      --tz string        The timezone of the container (default "Asia/Shanghai")
      --version string   The goctl builder golang image version

参数字段	参数类型	是否必填	默认值	参数说明
base	string	NO	scratch	基础镜像
branch	string	NO	空字符串	远程模板所在 git 分支名称，仅当 remote 有值时使用
exe	string	NO	主函数文件名	输出的可执行文件名称
go	string	YES	空字符串	主函数文件名称
home	string	NO	${HOME}/.goctl	本地模板文件目录
port	int	NO	0	需要暴露的端口号，如果没传或者传0，则不暴露端口号
remote	string	NO	空字符串	远程模板所在 git 仓库地址，当此字段传值时，优先级高于 home 字段值
tz	string	NO	Asia/Shanghai	时区设置
version	string	YES	空字符串	Golang 镜像版本号

使用示例

我们用 goctl api new hello 命令创建一个 Demo 项目，然后进入项目目录，执行 goctl docker 命令，生成 Dockerfile 文件。

以下通过终端指令演示如何从零开始创建一个 goctl 项目，然后生成 Dockerfile 文件，到最后构建 Docker 镜像，最后运行 Docker 容器的过程。

# 进入到个人 home 目录
$ cd ~
# 创建一个 hello 项目
$ goctl api new hello
Done.
# 进入到 hello 项目目录
$ cd hello
# 查看目录结构
$ tree
.
├── etc
│   └── hello-api.yaml
├── go.mod
├── hello.api
├── hello.go
└── internal
    ├── config
    │   └── config.go
    ├── handler
    │   ├── hellohandler.go
    │   └── routes.go
    ├── logic
    │   └── hellologic.go
    ├── svc
    │   └── servicecontext.go
    └── types
        └── types.go
7 directories, 10 files
# 生成 Dockerfile 文件
$ goctl docker --go hello.go --exe hello
Hint: run "docker build ..." command in dir:
    /Users/keson/hello
Done.
# 查看 Dockerfile 文件
$ cat Dockerfile
FROM golang:alpine AS builder
LABEL stage=gobuilder
ENV CGO_ENABLED 0
ENV GOPROXY https://goproxy.cn,direct
RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
RUN apk update --no-cache && apk add --no-cache tzdata
WORKDIR /build
ADD go.mod .
ADD go.sum .
RUN go mod download
COPY . .
COPY ./etc /app/etc
RUN go build -ldflags="-s -w" -o /app/hello hello.go
FROM scratch
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates.crt
COPY --from=builder /usr/share/zoneinfo/Asia/Shanghai /usr/share/zoneinfo/Asia/Shanghai
ENV TZ Asia/Shanghai
WORKDIR /app
COPY --from=builder /app/hello /app/hello
COPY --from=builder /app/etc /app/etc
CMD ["./hello", "-f", "etc/hello-api.yaml"]
# 拉取 go 依赖
$ go mod tidy
go: finding module for package github.com/zeromicro/go-zero/core/conf
go: finding module for package github.com/zeromicro/go-zero/core/logx
go: finding module for package github.com/zeromicro/go-zero/rest
go: finding module for package github.com/zeromicro/go-zero/rest/httpx
go: found github.com/zeromicro/go-zero/core/conf in github.com/zeromicro/go-zero v1.4.3
go: found github.com/zeromicro/go-zero/rest in github.com/zeromicro/go-zero v1.4.3
go: found github.com/zeromicro/go-zero/rest/httpx in github.com/zeromicro/go-zero v1.4.3
go: found github.com/zeromicro/go-zero/core/logx in github.com/zeromicro/go-zero v1.4.3
# 在 hello 项目目录下，执行 docker build 命令，生成镜像
$ docker build -t hello:v1 .
[+] Building 72.5s (20/20) FINISHED
 => [internal] load build definition from Dockerfile                                                     0.0s
 => => transferring dockerfile: 37B                                                                      0.0s
 => [internal] load .dockerignore                                                                        0.0s
 => => transferring context: 2B                                                                          0.0s
 => [internal] load metadata for docker.io/library/golang:alpine                                         1.0s
 => [internal] load build context                                                                        0.2s
 => => transferring context: 142.47kB                                                                    0.1s
 => [builder  1/10] FROM docker.io/library/golang:alpine@sha256:a9b24b67dc83b3383d22a14941c2b2b2ca6a10  25.5s
 => => resolve docker.io/library/golang:alpine@sha256:a9b24b67dc83b3383d22a14941c2b2b2ca6a103d805cac682  0.0s
 => => sha256:7f1d6579712341e8062db43195deb2d84f63b0f2d1ed7c3d2074891085ea1b56 116.88MB / 116.88MB      19.9s
 => => sha256:a9b24b67dc83b3383d22a14941c2b2b2ca6a103d805cac6820fd1355943beaf1 1.65kB / 1.65kB           0.0s
 => => sha256:d34d005738c897bad9671117acf4a27fe7d5ab80e129bf2aba2fa7c344c416e4 1.16kB / 1.16kB           0.0s
 => => sha256:3b877c93f9b7d6e7c07329c02d3a29d306b35bbe06d1c79d00d54d6ce2e5a360 5.13kB / 5.13kB           0.0s
 => => sha256:261da4162673b93e5c0e7700a3718d40bcc086dbf24b1ec9b54bca0b82300626 3.26MB / 3.26MB           2.7s
 => => sha256:bc729abf26b5aade3c4426d388b5ea6907fe357dec915ac323bb2fa592d6288f 286.22kB / 286.22kB       1.8s
 => => sha256:652874aefa1343799c619d092ab9280b25f96d97939d5d796437e7288f5599c9 156B / 156B               2.3s
 => => extracting sha256:261da4162673b93e5c0e7700a3718d40bcc086dbf24b1ec9b54bca0b82300626                0.2s
 => => extracting sha256:bc729abf26b5aade3c4426d388b5ea6907fe357dec915ac323bb2fa592d6288f                0.1s
 => => extracting sha256:7f1d6579712341e8062db43195deb2d84f63b0f2d1ed7c3d2074891085ea1b56                5.2s
 => => extracting sha256:652874aefa1343799c619d092ab9280b25f96d97939d5d796437e7288f5599c9                0.0s
 => [builder  2/10] RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories     0.6s
 => [builder  3/10] RUN apk update --no-cache && apk add --no-cache tzdata                              24.6s
 => [builder  4/10] WORKDIR /build                                                                       0.0s
 => [builder  5/10] ADD go.mod .                                                                         0.0s
 => [builder  6/10] ADD go.sum .                                                                         0.0s
 => [builder  7/10] RUN go mod download                                                                 11.3s
 => [builder  8/10] COPY . .                                                                             0.0s
 => [builder  9/10] COPY ./etc /app/etc                                                                  0.0s
 => [builder 10/10] RUN go build -ldflags="-s -w" -o /app/hello hello.go                                 9.1s
 => [stage-1 1/5] COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/ca-certificates  0.0s
 => [stage-1 2/5] COPY --from=builder /usr/share/zoneinfo/Asia/Shanghai /usr/share/zoneinfo/Asia/Shangh  0.0s
 => [stage-1 3/5] WORKDIR /app                                                                           0.0s
 => [stage-1 4/5] COPY --from=builder /app/hello /app/hello                                              0.0s
 => [stage-1 5/5] COPY --from=builder /app/etc /app/etc                                                  0.0s
 => exporting to image                                                                                   0.1s
 => => exporting layers                                                                                  0.1s
 => => writing image sha256:586fe3aab42d3d27ad73118334be072577801de18c22694b380161f00656dd7a             0.0s
 => => naming to docker.io/library/hello:v1                                                              0.0s
Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them
# 启动服务
$ docker run --rm -it -p 8888:8888 hello:v1
Starting server at 0.0.0.0:8888...
# 单开一个终端 curl 测试
$ curl -i http://localhost:8888/from/you
curl -i http://localhost:8888/from/you
HTTP/1.1 200 OK
Content-Type: application/json; charset=utf-8
Traceparent: 00-7950f2af01228e73c5adcf1670e309d2-2d8262ef5bd4f5a2-00
Date: Fri, 06 Jan 2023 06:41:34 GMT
Content-Length: 4
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