https://github.com/bitsofinfo/kubernetes-vs-swarm
Simple examples comparing kubernetes and docker swarm
https://github.com/bitsofinfo/kubernetes-vs-swarm
containers docker kubernetes swarm tutorials
Last synced: 3 months ago
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Simple examples comparing kubernetes and docker swarm
- Host: GitHub
- URL: https://github.com/bitsofinfo/kubernetes-vs-swarm
- Owner: bitsofinfo
- Created: 2019-04-25T16:38:18.000Z (over 6 years ago)
- Default Branch: master
- Last Pushed: 2019-05-06T15:18:11.000Z (over 6 years ago)
- Last Synced: 2025-03-24T05:18:43.896Z (10 months ago)
- Topics: containers, docker, kubernetes, swarm, tutorials
- Size: 500 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# kubernetes-vs-swarm
This project presents a very simple tutorial demonstrating deploying an app to both
Kubernetes and Docker Swarm to demonstrate the differences.
https://bitsofinfo.wordpress.com/2019/01/16/kubernetes-vs-swarm-the-most-basic-primer/
This example launches the following:
* Docker Service named `nginx1_app` available at published Swarm port: `30080`
* Kubernetes Deployment named `nginx1` available on `NodePort` `30081`
Each app has the following characteristics:
* 2+ replicas
* Published on a fixed high port on all nodes
* Mounting an external volume
* Access to a "secret"
* Configured with a *"healthcheck"*
## Prerequisites
You should have Docker for Mac/Windows installed with Kubernetes enabled.
DO NOT enable the *"Deploy Docker Stacks to Kubernetes by Default"* option
You've done `swarm init` on your local Docker
## Example
### Prep the NGINX doc root volumes
```
mkdir -p /tmp/k8-nginxdocroot
echo "k8 nginx" > /tmp/k8-nginxdocroot/index.html
mkdir -p /tmp/swarm-nginxdocroot
echo "swarm nginx" > /tmp/swarm-nginxdocroot/index.html
```
### Create our "secret" values:
Docker Secret
```
docker secret create nginx1_secret ./secret.txt
docker secret ls
```
Kubernetes
```
kubectl create secret generic mynginx-secret --from-file=./secret.txt
kubectl get secret mynginx-secret -o yaml
kubectl describe secret mynginx-secret
```
### Launch our app on Docker Swarm as a Service, view and check logs
Docker Service (via stack)
```
docker stack deploy -c swarm-nginx1.yaml nginx1
docker service ls
docker service inspect nginx1_app
docker service logs --tail 100 --follow $(docker service ps nginx1_app | grep nginx1 | awk '{print $1; exit}')
```
Kubernetes
```
kubectl create -f kubernetes-nginx1.yaml
kubectl get all
kubectl describe pod nginx1
kubectl logs --tail 100 --follow $(kubectl get pods | grep nginx1 | awk '{print $1; exit}')
```
### Shell into one of the replicas:
Docker Swarm
```
docker exec -it $(docker ps | grep nginx1_app | awk '{print $1; exit}') /bin/bash
```
Kubernetes
```
kubectl exec -it $(kubectl get pods | grep nginx1 | awk '{print $1; exit}') -- /bin/bash
```
Once inside a container
From within see ENV vars + secret value
```
env | grep SOME_ENV_VAR
env | grep SECRET_PATH
cat $SECRET_PATH
```
### Curl it!
Docker Swarm
```
curl http://localhost:30080
```
Kubernetes
```
curl http://localhost:30081
```
### Scale it
Docker Swarm
```
docker service scale nginx1_app=3
docker service ps nginx1_app
```
Kubernetes
```
kubectl scale deployment nginx1 --replicas=3
kubectl get pods
kubectl describe deployment nginx1
```
### Remove
Docker Swarm
```
docker service rm nginx1_app
docker secret rm nginx1_secret
docker service ls
rm -rf /tmp/swarm-nginxdocroot
```
Kubernetes
```
kubectl delete -f kubernetes-nginx1.yaml
kubectl delete secret mynginx-secret
kubectl get all
rm -rf /tmp/k8-nginxdocroot/
```