https://github.com/ruanbekker/golang-build-small-images

Demo of Building Small Golang Images
https://github.com/ruanbekker/golang-build-small-images

Last synced: about 2 months ago
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Demo of Building Small Golang Images

• Host: GitHub
• URL: https://github.com/ruanbekker/golang-build-small-images
• Owner: ruanbekker
• Created: 2019-04-03T10:23:04.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2019-04-03T12:21:26.000Z (over 5 years ago)
• Last Synced: 2024-07-08T16:40:05.719Z (2 months ago)
• Language: Go
• Size: 4.88 KB
• Stars: 2
• Watchers: 3
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# golang-build-small-images

Demo of Building Small Golang Images

![](https://user-images.githubusercontent.com/567298/55478306-aabb0600-561b-11e9-9cc6-730fadb4beeb.png)

## About

So we thinking lets go with alpine right? Yeah sure lets build a small, lekke, but useless app running on go with alpine.

Let's package our app to an image:

```

❯ docker build -t mygolangapp:using-alpine .

```

Inspect the size of our image, as you can see it being 310MB

```

❯ docker images "mygolangapp:*"

REPOSITORY          TAG                 IMAGE ID            CREATED              SIZE

mygolangapp         using-alpine        eea1d7bde218        About a minute ago   310MB

```

Just make sure it actually works:

```

❯ docker run mygolangapp:using-alpine

Number of words: 16

Selected index number: 11

Selected word is: mountain lion

```

But for something just returning random selected text, 310MB is a bit crazy.

## Multi Stage Builds

As Go binaries are self-contained, we can make use of docker's multi stage builds, where we can build our application on alpine and use the binary on a scratch image:

Build it:

```

❯ docker build -t mygolangapp:using-multistage -f Dockerfile.multi .

```

Notice that the image is only 2.01MB, say w000t!

```

❯ docker images "mygolangapp:*"

REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE

mygolangapp         using-multistage    31474c61ba5b        15 seconds ago      2.01MB

mygolangapp         using-alpine        eea1d7bde218        2 minutes ago       310MB

```

Run the app:

```

❯ docker run mygolangapp:using-multistage

Number of words: 16

Selected index number: 5

Selected word is: spider

```