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chore: update 1.18 and use trick multi Go install

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sudo pacman -Syu 2022-06-08 17:42:03 +07:00
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commit 6b6b80df37
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posts/2021-12-18-dockerfile-go.md → posts/2022-06-08-dockerfile-go.md
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@ -6,7 +6,10 @@ Like set up `.gitignore`, CI configs, Dockerfile, ...
So I decide to have a baseline Dockerfile like this:
```Dockerfile
FROM golang:1.18beta1-bullseye as builder
FROM golang:1.18-bullseye as builder
RUN go install golang.org/dl/go1.18@latest \
&& go1.18 download
WORKDIR /build
@ -36,10 +39,19 @@ So I stick with it for a while.
Also, remember to match Distroless Debian version with Go official image Debian version.
```Dockerfile
FROM golang:1.18beta1-bullseye as builder
FROM golang:1.18-bullseye as builder
```
This is Go image I use as a build stage.
This can be official Go image or custom image is required in some companies.
```Dockerfile
RUN go install golang.org/dl/go1.18@latest \
&& go1.18 download
```
This is optional.
In my case, my company is slow to update Go image so I use this trick to install latest Go version.
```Dockerfile
WORKDIR /build
@ -54,10 +66,10 @@ I use `/build` to emphasize that I am building something in that directory.
The 4 `COPY` lines are familiar if you use Go enough.
First is `go.mod` and `go.sum` because it defines Go modules.
The second is `vendor` because I use it a lot, this is not necessary but I use it because I don't want each time I build Dockerfile, I need to redownload Go modules.
The second is `vendor`, this is optional but I use it because I don't want each time I build Dockerfile, I need to redownload Go modules.
```Dockerfile
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOAMD64=v3 go build -o ./app main.go
RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 GOAMD64=v3 go build -o ./app .
```
This is where I build Go program.