https://github.com/mbode/kubernetes-tool-comparison
Demonstration showing how to deploy the K8s guestbook example using a variety of deployment tools.
https://github.com/mbode/kubernetes-tool-comparison
guestbook kubectl kubernetes
Last synced: 7 months ago
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Demonstration showing how to deploy the K8s guestbook example using a variety of deployment tools.
- Host: GitHub
- URL: https://github.com/mbode/kubernetes-tool-comparison
- Owner: mbode
- License: mit
- Created: 2018-05-30T15:31:56.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2018-06-23T06:30:07.000Z (over 7 years ago)
- Last Synced: 2025-01-16T02:42:17.126Z (9 months ago)
- Topics: guestbook, kubectl, kubernetes
- Language: Shell
- Homepage:
- Size: 8.79 KB
- Stars: 1
- Watchers: 3
- Forks: 0
- Open Issues: 6
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# K8s Tool Comparison
[](https://travis-ci.org/mbode/kubernetes-tool-comparison)
This repository shows how to deploy the [K8s guestbook example](https://github.com/kubernetes/examples/tree/master/guestbook) using a variety of deployment tools.
For more details on the example check out the [tutorial in the K8s docs](https://kubernetes.io/docs/tutorials/stateless-application/guestbook/).
## Table of Contents
* [Use Case](#use-case)
* [Tools](#tools)
* [kubectl](#kubectl)
* [Helm](#helm)
## Use Case
[guestbook.yaml](guestbook.yaml) contains the vanilla guestbook Kubernetes manifest, defining the following resources:
* _redis-master_ (Service, Deployment)
* _redis-slave_ (Service, Deployment)
* _frontend_ (Service, Deployment)
They can be deployed using:
```bash
kubectl apply -f guestbook.yaml
```
Now let us pretend we want do deploy all of these resources several times.
In our example we need two completely separate installations of the whole stack, one for _cats_ and one for _dogs_. Furthermore, as it is well known that cats are better conversationalists, we expect a higher load there and would like to give the respective _redis-slave_ twice the resource requests.
Another natural reason for this duplication could be a deployment pipeline with promotion across stages like _dev_, _staging_ and _prod_, where one also might prefer e.g. different resource requests or replica counts to save on resources for the earlier stages.
## Tools
### kubectl
_kubectl_ is the included CLI of all Kubernetes clusters, supporting declarative deployments using YAML-based Kubernetes manifests.
There is not much more to do than manually duplicate everything when using plain _kubectl_:
```bash
kubectl apply -f kubectl/cats-guestbook.yaml
kubectl apply -f kubectl/dogs-guestbook.yaml
```
Note that the two files are very similar but not exactly the same.
It is quite easy to see how a setup like this is not very maintainable.
### Helm
[Helm](https://github.com/kubernetes/helm) is a package manager for Kubernetes.
Reusable pieces are packaged in _Charts_ that can be customized during installation with values that are templated into the Kubernetes manifests.
```bash
helm install -f helm/cats.yaml helm/guestbook
helm install -f helm/dogs.yaml helm/guestbook
```