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Istio Vet

The istio-vet tool is a utility to validate the configuration of Istio and user applications installed in a Kubernetes cluster.

Introduction

The istio-vet utility helps discover incompatible configuration of user applications and Istio components in a kubernetes cluster. Misconfigurations might cause unexpected or incorrect service mesh behavior which can be easily detected and fixed using this tool.

The istio-vet tool invokes a list of independent vetters. Each vetter performs validation on a subset of configurations and generates notes on any misconfiguration.

Note that istio-vet and vetters only read configuration objects from the kubernetes API server.

Example

Vetter meshversion inspects the version of running Istio components and the sidecar version deployed in pods in the mesh. It generates the following note on any version mismatch:

Summary: "Mismatched sidecar version - myapp-xyz-1234"

Message: "WARNING: The pod myapp-xyz-1234 in namespace default is running with
sidecar proxy version 0.2.10 but your environment is running Istio
version 0.2.12. Consider upgrading the sidecar proxy in the pod."

Running

The official docker image is quay.io/aspenmesh/istio-vet:master

Container image can be deployed in a kubernetes cluster or run locally.

Local

When run locally, kube config for the kubernetes cluster needs to be mounted inside the container.

docker run --rm -v $HOME/.kube/config:/root/.kube/config quay.io/aspenmesh/istio-vet:master

In-cluster

The istio-vet container can be deployed as a Job in a kubernetes cluster using the manifest file in the install directory.

kubectl apply -f install/kubernetes/istio-vet.yaml

To inspect the output of the istio-vet, use the following command:

kubectl -n istio-system logs -l "app=istio-vet" --tail=0

Note that the Job would have to be manually run every time to get the latest output from the istio-vet utility.

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Repository Layout

This repository contains code for the vet tool and supported vetters packages. It includes:

  • pkg/vet - This directory contains code for the vet utility which is the main binary produced by the repository.

  • pkg/vetters - This directory contains packages for individual vetters, helper utility package and the interface definitions for vetters to implement. It includes the following vetters:

    • meshversion - This vetter inspects the version of various installed Istio components and generates notes on mismatching versions. It also inspects the version of sidecar proxy running in pods in the mesh and compares it with the installed Istio version and reports back any version mismatch.

    • mtlsprobes - This vetter inspects if mTLS is enabled in Istio service mesh. It generates warnings if Liveness or Readiness probe is configured for a Pod in a mTLS enabled mesh.

    • serviceportprefix - This vetter inspects services in the Istio mesh and reports back if any service port name definition doesn't include Istio recognized port protocol prefixes.

    • podsinmesh - This vetter reports back the number of user pods in/out of the mesh. It also reports number of system pods running which are exempted from the mesh.

    • applabel - This vetter inspects the labels defined for the pods in the mesh and generates notes if the label app is missing in any pod specification.

More details about vetters can be found in the individual vetters package documentation.