Each time I start a new Go project, I repeat many steps.
Like set up .gitignore, CI configs, Dockerfile, ...
So I decide to have a baseline Dockerfile like this:
FROM golang:1.18-bullseye as builder
+IndexDockerfile for Go
Each time I start a new Go project, I repeat many steps.
Like set up .gitignore, CI configs, Dockerfile, ...
So I decide to have a baseline Dockerfile like this:
FROM golang:1.19-bullseye as builder
-RUN go install golang.org/dl/go1.18@latest \
- && go1.18 download
+RUN go install golang.org/dl/go1.19@latest \
+ && go1.19 download
WORKDIR /build
@@ -17,9 +17,9 @@ FROM gcr.io/distroless/base-debian11
COPY --from=builder /build/app /app
ENTRYPOINT ["/app"]
-
I use multi-stage build to keep my image size small.
First stage is Go official image,
second stage is Distroless.
Before Distroless, I use Alpine official image,
There is a whole discussion on the Internet to choose which is the best base image for Go.
After reading some blogs, I discover Distroless as a small and secure base image.
So I stick with it for a while.
Also, remember to match Distroless Debian version with Go official image Debian version.
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.
RUN go install golang.org/dl/go1.18@latest \
- && go1.18 download
+
I use multi-stage build to keep my image size small.
First stage is Go official image,
second stage is Distroless.
Before Distroless, I use Alpine official image,
There is a whole discussion on the Internet to choose which is the best base image for Go.
After reading some blogs, I discover Distroless as a small and secure base image.
So I stick with it for a while.
Also, remember to match Distroless Debian version with Go official image Debian version.
FROM golang:1.19-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.
RUN go install golang.org/dl/go1.19@latest \
+ && go1.19 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.
WORKDIR /build
COPY go.mod .
diff --git a/posts/2022-06-08-dockerfile-go.md b/posts/2022-06-08-dockerfile-go.md
index 9f04bfe..b8fe99e 100644
--- a/posts/2022-06-08-dockerfile-go.md
+++ b/posts/2022-06-08-dockerfile-go.md
@@ -6,10 +6,10 @@ Like set up `.gitignore`, CI configs, Dockerfile, ...
So I decide to have a baseline Dockerfile like this:
```Dockerfile
-FROM golang:1.18-bullseye as builder
+FROM golang:1.19-bullseye as builder
-RUN go install golang.org/dl/go1.18@latest \
- && go1.18 download
+RUN go install golang.org/dl/go1.19@latest \
+ && go1.19 download
WORKDIR /build
@@ -39,15 +39,15 @@ So I stick with it for a while.
Also, remember to match Distroless Debian version with Go official image Debian version.
```Dockerfile
-FROM golang:1.18-bullseye as builder
+FROM golang:1.19-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
+RUN go install golang.org/dl/go1.19@latest \
+ && go1.19 download
```
This is optional.