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I want to run 'kubectl' commands in the container, so i want to install kubectl in the container, through while building the Docker image. Any help is appreciated!
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Use the kubectl commandThe kubectl binary is not automatically packaged with Docker Desktop for Linux. To install the kubectl command for Linux, see Kubernetes documentation. It should be installed at /usr/local/bin/kubectl .
Can Kubernetes Run Without Docker? The answer is both yes and no. Kubernetes, in itself, is not a complete solution. It depends on a container runtime to orchestrate; you can't manage containers without having containers in the first place.
kubectl is written in go, so is completely self-contained.
You can therefore copy it from another container that already includes it. Like I do here, copying it from bitnami/kubectl:1.20.9:
FROM bitnami/kubectl:1.20.9 as kubectl
FROM ubuntu-or-whatever-image:tag
# Do whatever you need to with the
# ubuntu-or-whatever-image:tag image, then:
COPY --from=kubectl /opt/bitnami/kubectl/bin/kubectl /usr/local/bin/
I like this better than fiddling with curl, because now you're taking advantage of Dockers ability to cache the bitnami/kubectl:1.20.9 image.
91
put this in your Dockerfile
RUN curl -LO https://storage.googleapis.com/kubernetes-release/release/$(curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt)/bin/linux/amd64/kubectl
RUN chmod +x ./kubectl
RUN mv ./kubectl /usr/local/bin
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