# mount-hostpath

**Repository Path**: rogax/mount-hostpath

## Basic Information

- **Project Name**: mount-hostpath
- **Description**: No description available
- **Primary Language**: Go
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2019-09-25
- **Last Updated**: 2021-09-10

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# Kubernetes Admission Webhook example

This tutoral shows how to build and deploy an [AdmissionWebhook](https://kubernetes.io/docs/reference/access-authn-authz/extensible-admission-controllers/#admission-webhooks).

The Kubernetes [documentation](https://kubernetes.io/docs/concepts/overview/working-with-objects/common-labels/) contains a common set of recommended labels that allows tools to work interoperably, describing objects in a common manner that all tools can understand. In addition to supporting tooling, the recommended labels describe applications in a way that can be queried.
In our validating webhook example we make these labels required on deployments and services, so this webhook rejects every deployment and every service that doesn’t have these labels set. The mutating webhook in the example adds all the missing required labels with `not_available` set as the value.

## Prerequisites

Kubernetes 1.9.0 or above with the `admissionregistration.k8s.io/v1beta1` API enabled. Verify that by the following command:
```
kubectl api-versions | grep admissionregistration.k8s.io/v1beta1
```
The result should be:
```
admissionregistration.k8s.io/v1beta1
```

In addition, the `MutatingAdmissionWebhook` and `ValidatingAdmissionWebhook` admission controllers should be added and listed in the correct order in the admission-control flag of kube-apiserver.

## Build

1. Setup dep

   The repo uses [dep](https://github.com/golang/dep) as the dependency management tool for its Go codebase. Install `dep` by the following command:
```
go get -u github.com/golang/dep/cmd/dep
```

2. Build and push docker image
   
```
./build
```

## How does it work?

We have a blog post that explains webhooks in depth with the help of this example. Check [it](https://banzaicloud.com/blog/k8s-admission-webhooks/) out!