new-kubernetes-knowledge.md

Basics

1. Apply all deployments:

kubectl kustomize k8s | kubectl apply -f -

2. Delete all deployments:

kubectl delete pods --all

Persistent Volumes and their Claims

1. Create directory called .kubernetes_storage in the root of the project
2. Create directory in .kubernetes_storage called db-volume
3. Create directory in .kubernetes_storage called static-volume

Now, when we specify the PV and PVC, we can use the hostPath to specify the path to the directory we just created. This allows us to have a persistent volume that is not tied to a specific node.

Secrets

1. Creating secrets from .web-env.kubernetes

kubectl create secret generic web-env --from-env-file=./.web-env.kubernetes

2. Creating db secrets from .db-credentials.kubernetes

kubectl create secret generic db-credentials --from-env-file=./.db-credentials.kubernetes

3. Creating NGINX ConfigMap from ./nginx/nginx.conf

kubectl create configmap nginx-config --from-file=./nginx/nginx.conf

If staticfiles are not working:

kubectl exec -it <web-pod-name> -- python manage.py makemigrations
kubectl exec -it <web-pod-name> -- python manage.py migrate
kubectl exec -it <web-pod-name> -- python manage.py collectstatic --no-input