Chainguard Container for kubernetes-csi-livenessprobe

A sidecar container that can be included in a CSI plugin pod to enable integration with Kubernetes Liveness Probe.

Chainguard Containers are regularly-updated, secure-by-default container images.

Download this Container Image

For those with access, this container image is available on cgr.dev:

docker pull cgr.dev/ORGANIZATION/kubernetes-csi-livenessprobe:latest

Be sure to replace the ORGANIZATION placeholder with the name used for your organization's private repository within the Chainguard Registry.

Run it

Generally speaking, the kubernetes-csi-livenessprobe is a low level Kubernetes component not meant to be managed directly. However, all the steps outlined in the upstream repo apply just as well to the Chainguard Image version.

Test it

A simple smoke test is provided below that leverages docker to spin up the liveness probe attached to a csi driver and ensure basic functionality is met:

#!/usr/bin/env bash

set -o errexit -o nounset -o errtrace -o pipefail -x

if [[ "${IMAGE_NAME}" == "" ]]; then
	echo "Must set IMAGE_NAME environment variable. Exiting."
	exit 1
fi

UDS="/csi/csi.sock"
CSI_ENDPOINT="unix:/$UDS"

# Start hostpathplugin in the background
docker run -d --name csi-driver -v $(pwd)/csi:/csi quay.io/k8scsi/hostpathplugin:v1.6.0 --endpoint=$CSI_ENDPOINT -nodeid 1 --v=5
trap "docker rm -f csi-driver" EXIT

docker run -d --name probe -p 9808:9808 -v $(pwd)/csi:/csi "$IMAGE_NAME" --v=5 --csi-address=$UDS
trap "docker rm -f probe" EXIT

# Give time to CSI hostpathplugin and livenessprobe to initialize
sleep 3

# Requesting health
health=$(curl -I http://localhost:9808/healthz | grep HTTP | awk '{print $2}')
if [[ "x$health" != "x200" ]]; then
	echo "Health check failed, but it was not supposed to, exiting..."
	exit 1
fi

# Killing hostpathplugin
docker stop csi-driver
sleep 3

# Requesting health, should fail since hostpathplugin is gone
health=$(curl -I http://localhost:9808/healthz | grep HTTP | awk '{print $2}')
if [[ "x$health" != "x500" ]]; then
	echo "Health check did not detect driver failure, returned code: $health, exiting..."
	exit 1
fi

exit 0

What are Chainguard Containers?

Chainguard Containers are minimal container images that are secure by default.

In many cases, the Chainguard Containers tagged as :latest contain only an open-source application and its runtime dependencies. These minimal container images typically do not contain a shell or package manager. Chainguard Containers are built with Wolfi, our Linux undistro designed to produce container images that meet the requirements of a more secure software supply chain.

The main features of Chainguard Containers include:

• Minimal design, without unnecessary software bloat
• Daily builds to ensure container images are up-to-date with available security patches
• High quality build-time SBOMs attesting to the provenance of all artifacts within the image
• Verifiable signatures provided by Sigstore
• Reproducible builds with Cosign and apko (read more about reproducibility)

For cases where you need container images with shells and package managers to build or debug, most Chainguard Containers come paired with a -dev variant.

Although the -dev container image variants have similar security features as their more minimal versions, they feature additional software that is typically not necessary in production environments. We recommend using multi-stage builds to leverage the -dev variants, copying application artifacts into a final minimal container that offers a reduced attack surface that won’t allow package installations or logins.

Learn More

To better understand how to work with Chainguard Containers, please visit Chainguard Academy and Chainguard Courses.

In addition to Containers, Chainguard offers VMs and Libraries. Contact Chainguard to access additional products.

Trademarks

This software listing is packaged by Chainguard. The trademarks set forth in this offering are owned by their respective companies, and use of them does not imply any affiliation, sponsorship, or endorsement by such companies.