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https://github.com/noherczeg/play-kube
https://github.com/noherczeg/play-kube
Last synced: about 1 month ago
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- Host: GitHub
- URL: https://github.com/noherczeg/play-kube
- Owner: noherczeg
- Created: 2024-02-14T20:36:39.000Z (9 months ago)
- Default Branch: master
- Last Pushed: 2024-02-15T01:44:46.000Z (9 months ago)
- Last Synced: 2024-02-15T21:45:35.686Z (9 months ago)
- Language: JavaScript
- Size: 24.4 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Play Kube
Me playing with Kubernetes.
## Warning
At the time of writing, Docker v25 had issues, and minikube couldn't load images.
The solution was to downgrade to Docker v24:
List versions:
```bash
apt-cache madison docker-ce | awk '{ print $3 }'
````
E.g.: `5:24.0.9-1~ubuntu.22.04~jammy`
Unintall old versions:
```bash
for pkg in docker.io docker-doc docker-compose docker-compose-v2 podman-docker containerd runc; do sudo apt-get remove $pkg; done
```
Install specific version:
```bash
VERSION_STRING=5:24.0.9-1~ubuntu.22.04~jammy \
sudo apt-get install docker-ce=$VERSION_STRING docker-ce-cli=$VERSION_STRING containerd.io docker-buildx-plugin docker-compose-plugin
```
## Setup
### Obtain minikube
```bash
curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube_latest_amd64.deb
```
### Install
```bash
sudo dpkg -i minikube_latest_amd64.deb
```
### Install kubectl
```bash
sudo snap install kubectl --classic
```
### Start cluster
```bash
minikube start
```
## CLI commands
**Get info:**
- Get cluster info: `kubectl get po -A`
- Get pods: `kubectl get pods`
- List Services (e.g. to debug dns issues): `kubectl get svc`
- List Persistent Volume Claims: `kubectl get pvc`
**Image loading and info:**
- List available minikube images: `minikube image ls --format table`
- Load local image outside from minikube: `minikube image load play-kube-app:1.0.0`
**Deployment:**
- Apply all configurations in folder: `kubectl apply -f k8s`
- Delete deployments: `kubectl delete -f k8s`
- Delete a specific PVC: `kubectl delete pvc `
**Logs and debugging:**
- Debug pod: `kubectl get pod play-kube-app-8cf6674f5-24gdl -o yaml`
- Get pod logs(feed): `kubectl logs -f play-kube-app-5746f65986-9nzzp`
## Application
### Build Image
```bash
docker build -t play-kube-app:1.0.0 ./application
```
### Compose
```bash
docker compose -f ./application/docker-compose.yaml up --build
```
### Endpoints
- `/`: entrypoint
- `/users`: list of users
- `/service/seed`: endpoint to seed the users table with random data
- `/service/health`: health check endpoint
- `/service/kill`: kill the instance
## Accessing Load-balanced apps:
"In Minikube, when you create a LoadBalancer service, it simulates a LoadBalancer using a NodePort service and provides an external IP address that routes traffic to the NodePort on one of the Minikube nodes."
To get the ip of minikube run:
```bash
minikube ip
```
To get which port did minikube map our services run (and search for `3000`):
```bash
kubectl get svc
```
Therefore for example if we are expecting our app to be available at `localhost:3000`, in
my case it ended up being `192.168.49.2:32579`
## Manual backup and restore
**Backup:**
Log into the pod:
```bash
kubectl exec -it play-kube-postgres-0 -- /bin/bash
```
Create backup:
```bash
cd /opt \
pg_dump -U > backup.sql
```
Extract backup from pod:
```bash
kubectl cp play-kube-postgres-0:/opt/backup.sql ./backup.sql
```
## Sources
- https://minikube.sigs.k8s.io/docs/start/
- https://dzone.com/articles/crafting-database-models-with-knexjs-and-postgresq