Docker builds kubectl image implementation steps

If the program service is deployed using k8s integrated with gitlab ci/cd, the kubeclt image is needed in the gitlab-ci process. There are two ways to build a kubectl image using docker

Method 1 (the image is relatively small, about 45.8M)

Install the kubectl executable using curl on Linux

cd /usr/local/bin
curl -LO https://storage.googleapis.com/kubernetes-release/release/v1.20.1/bin/linux/amd64/kubectl
chmod +x ./kubectl

Refer to the official installation documentation for details

Next, create a new Dockerfile file in the /usr/local/bin directory and write the following content

FROM alpine:latest
COPY kubectl /usr/local/bin/
RUN chmod +x /usr/local/bin/kubectl

After the Dockerfile file is built, execute the build command in the same directory

docker build -t registry.cn-hangzhou.aliyuncs.com/sanchar/kubectl:v1.20.1 .

Wait for the image to be built

Method 2 (the image is relatively large, about 48.9M)

This method is relatively convenient, but the construction is slow. During the construction process, you need to download the kubectl executable file and directly create a new Dockerfile file with the following content

FROM alpine:latest

RUN apk add --update -t ​​deps curl

RUN curl -L https://storage.googleapis.com/kubernetes-release/release/v1.20.1/bin/linux/amd64/kubectl -o /usr/local/bin/kubectl \
  && chmod +x /usr/local/bin/kubectl

RUN apk del --purge deps \
  && rm /var/cache/apk/*

Execute the build command in the same directory

docker build -t registry.cn-hangzhou.aliyuncs.com/sanchar/kubectl:v1.20.1 .

at last

1. Test whether the built image can be used normally

docker run -it registry.cn-hangzhou.aliyuncs.com/sanchar/kubectl:v1.20.1 kubectl version --client

The output content is as follows, that is, the built image can be used normally

Client Version: version.Info{Major:"1", Minor:"20", GitVersion:"v1.20.1", GitCommit:"c4d752765b3bbac2237bf87cf0b1c2e307844666", GitTreeState:"clean", BuildDate:"2020-12-18T12:09:25Z", GoVersion:"go1.15.5", Compiler:"gc", Platform:"linux/amd64"}

2. Pull the image from the Registry

docker pull registry.cn-hangzhou.aliyuncs.com/sanchar/kubectl:v1.20.1

3. Push the image to the Registry and replace [ImageId] with the corresponding image ID

docker login --username=usernameregistry.cn-hangzhou.aliyuncs.com

docker tag [ImageId] registry.cn-hangzhou.aliyuncs.com/sanchar/kubectl:v1.20.1

docker push registry.cn-hangzhou.aliyuncs.com/sanchar/kubectl:v1.20.1

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