To build the Docker image,run the docker build command in the directory containing the Dockerfile. Check the Dockerfile you will find in the next step to see how simple this is. You only need to add the binary to a Docker image. Once you have completed the steps above, running a Go application is very easy. For these reasons, this tutorial deploys the Go web application on top of Bitnami's minideb image, which is a minimal version of Debian designed for use in containers.Ĭopy the binary to the tutorials/go-k8s/app-code/ folder: cp http-sample tutorials/go-k8s/app-code/ Some of the cons of this approach would be that you have to include other files for Web applications, like CA certificates, or if you want to use a shell. This is good for containers because we can deploy a very minimal image without any required libraries (for example, the Docker "scratch" image). Using the -tags netgo option prevents the net package from linking to the host resolver, ensuring that the binary is not linked to any system library. There are different ways to build a binary with Go. If you have Go already installed, you can simply build it with the following command: GOOS=linux GOARCH=amd64 go build -tags netgo -o http-sample If you don't, skip them and build the Docker image as shown in Step 2. The following steps only apply if you already have a Go binary. Check the official Go documentation for further information on how to build a Go binary. It uses the existing Go binary that is in the app-code directory in the project code repository. This tutorial skips the step of creating a Go binary, as it is out of the scope of the current guide. helm-chart directory: a folder that contains the ready-made Helm chart used in this tutorial.app-code directory: a folder that contains the application source code and a pre-built binary.Each line indicates an instruction and a command for assembling all the pieces that comprise the image. Dockerfile: a text file that contains instructions on how to build a Docker image.In this repository you will find the following: This will clone the entire tutorials repository. To begin the process, clone the tutorials repository, as shown below for the sample application: git clone Step 1: Obtain the application source code Step 6: Update the source code and the Helm chart.Step 5: Deploy the example application in Kubernetes.Step 1: Obtain the application source code.To create your own application in Go and deploy it on Kubernetes using Helm you will typically follow these steps: You have the kubectl command line ( kubectl CLI) installed.You have Minikube installed on your local computer.You have an account in a container registry (this tutorial assumes that you are using Docker Hub).You have basic knowledge of Helm charts and how to create them.You have basic knowledge of the Go programming language and have run Go applications before.This guide makes the following assumptions: The example application is a typical "to-do list" application. This guide will show you how to deploy an example Go application in a Kubernetes cluster running on Minikube. The compiled binary can run without the Go runtime, so container images are smaller. Go applications are generally suitable for running in containers because they can be compiled as a single binary that contains all the dependencies they need to run. Once the application is deployed and working, it also explores how to modify the source code for publishing a new application release and how to perform rolling updates in Kubernetes using the Helm CLI. The first step is to create the Go program binary, insert the binary into a minimal Dockerfile and use it as a starting point for creating a custom Helm chart to automate the application deployment in a Kubernetes cluster. It uses a simple API for a "to-do list" application. This guide walks you through the process of running an example Go application on a Kubernetes cluster.
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