1. Go×Dockerで環境構築を実施する。
Go×Dockerは最近のナウイ開発ではよくこの構成になっています。本記事ではGo×Dockerの環境構築の方法を記載しております。
①go moduleを作成する
go modはGoのアプリケーションルートのようなものです。値はなんでも良いのですが、github.com/ユーザ名/アプリケーション名が慣例となっています。
go module
~/develop/go_docker $ go mod init github.com/kouji0705/go_docker
go: creating new go.mod: module github.com/kouji0705/go_docker
②アプリケーションフレームワークであるechoをインストールする。
~/develop/go_docker $ go get -u github.com/labstack/echo
go get: added github.com/labstack/echo v3.3.10+incompatible
go get: added github.com/labstack/gommon v0.3.1
go get: added github.com/mattn/go-colorable v0.1.12
go get: added github.com/mattn/go-isatty v0.0.14
go get: added github.com/valyala/bytebufferpool v1.0.0
go get: added github.com/valyala/fasttemplate v1.2.1
go get: added golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e
go get: added golang.org/x/net v0.0.0-20220607020251-c690dde0001d
go get: added golang.org/x/sys v0.0.0-20220608164250-635b8c9b7f68
go get: added golang.org/x/text v0.3.7
③main.goを作成する。
main.go
package main
import (
"net/http"
"github.com/labstack/echo"
)
func main() {
e := echo.New()
e.GET("/", func(c echo.Context) error {
return c.String(http.StatusOK, "HelloWorld!")
})
e.Logger.Fatal(e.Start(":1323"))
}
④ホットリロードするairをインストールする。
~/develop/go_docker $ go install github.com/cosmtrek/air@latest
~/develop/go_docker $ air init
__ _ ___
/ /\ | | | |_)
/_/--\ |_| |_| \_ , built with Go
.air.toml file created to the current directory with the default settings
⑤Dockerfile、docker-compose.ymlを作成する。
Dockerfile
# Dockerfile
FROM golang:1.17
ENV TZ /usr/share/zoneinfo/Asia/Tokyo
ENV ROOT=/go/src/app
WORKDIR ${ROOT}
ENV GO111MODULE=on
COPY . .
EXPOSE 1323
RUN go install github.com/cosmtrek/air@latest
CMD ["air"]
docker-compose.yml
version: '3'
services:
app:
build: .
volumes:
- ./:/go/src/app
ports:
- "1323:1323"
Dockerを実行する
アプリ実行
~/develop/go_docker $ docker-compose up
Creating network "go_docker_default" with the default driver
Building app
[+] Building 30.0s (9/9) FINISHED
=> [internal] load build definition from Dockerfile 0.0s
=> => transferring dockerfile: 238B 0.0s
=> [internal] load .dockerignore 0.0s
=> => transferring context: 2B 0.0s
=> [internal] load metadata for docker.io/library/golang:1.17 3.0s
=> [1/4] FROM docker.io/library/golang:1.17@sha256:b1ff3263f543b4c458e172f3df429a3e7dfed29d4359ab 20.9s
=> => resolve docker.io/library/golang:1.17@sha256:b1ff3263f543b4c458e172f3df429a3e7dfed29d4359ab8 0.0s
=> => sha256:dceb25b534d8da2aa50da5c6489fc4120db24f24dcf8b3b1862d1a8cebf1210b 1.80kB / 1.80kB 0.0s
=> => sha256:0e970dee9aa41b53e9096c0fe39d64d8e4e96dfbffaa7b47a9d1897ae965b9b0 7.11kB / 7.11kB 0.0s
=> => sha256:bbec5306b106b1062838a5fa65c34731772b8da7ff56a9aec828890a5bf1f226 156B / 156B 0.6s
=> => sha256:b1ff3263f543b4c458e172f3df429a3e7dfed29d4359ab839a614f903252e1df 2.35kB / 2.35kB 0.0s
=> => sha256:ad491e6a2878e96d876127fb0107f5063e90c343528b58151170cd95ce9b0a95 134.96MB / 134.96MB 12.4s
=> => extracting sha256:ad491e6a2878e96d876127fb0107f5063e90c343528b58151170cd95ce9b0a95 8.1s
=> => extracting sha256:bbec5306b106b1062838a5fa65c34731772b8da7ff56a9aec828890a5bf1f226 0.0s
=> [internal] load build context 0.3s
=> => transferring context: 6.60MB 0.2s
=> [2/4] WORKDIR /go/src/app 1.3s
=> [3/4] COPY . . 0.0s
=> [4/4] RUN go install github.com/cosmtrek/air@latest 4.1s
=> exporting to image 0.4s
=> => exporting layers 0.4s
=> => writing image sha256:8800bf76c4f662e1931d2234a5039b9ab28ed8e9b758a991b27ccc0e0b66cf6d 0.0s
=> => naming to docker.io/library/go_docker_app 0.0s
Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them
WARNING: Image for service app was built because it did not already exist. To rebuild this image you must use `docker-compose build` or `docker-compose up --build`.
Creating go_docker_app_1 ... done
Attaching to go_docker_app_1
app_1 |
app_1 | __ _ ___
app_1 | / /\ | | | |_)
app_1 | /_/--\ |_| |_| \_ , built with Go
app_1 |
app_1 | watching .
app_1 | !exclude tmp
app_1 | building...
app_1 | go: downloading github.com/labstack/echo v3.3.10+incompatible
app_1 | go: downloading github.com/labstack/gommon v0.3.1
app_1 | go: downloading golang.org/x/crypto v0.0.0-20220525230936-793ad666bf5e
app_1 | go: downloading github.com/mattn/go-isatty v0.0.14
app_1 | go: downloading github.com/mattn/go-colorable v0.1.12
app_1 | go: downloading github.com/valyala/fasttemplate v1.2.1
app_1 | go: downloading golang.org/x/sys v0.0.0-20220608164250-635b8c9b7f68
app_1 | go: downloading github.com/valyala/bytebufferpool v1.0.0
app_1 | go: downloading golang.org/x/net v0.0.0-20220607020251-c690dde0001d
app_1 | go: downloading golang.org/x/text v0.3.7
app_1 | running...
app_1 |
app_1 | ____ __
app_1 | / __/___/ / ___
app_1 | / _// __/ _ \/ _ \
app_1 | /___/\__/_//_/\___/ v3.3.10-dev
app_1 | High performance, minimalist Go web framework
app_1 | https://echo.labstack.com
app_1 | ____________________________________O/_______
app_1 | O\
app_1 | ⇨ http server started on [::]:1323
→ブラウザからアクセスすると、「HelloWorld」が表示されているのが確認できます！！
