Kubernetes cheat sheet 2

Namespaces

kubectl get pods --namespace=dev
kubectl get pods --namespace=default

kubectl config set-context $(kubectl config current-context) --namespace=dev

ConfigMap

kubectl create configmap myconfigmap --from-literal=APP_COLOR=blue
kubectl create -f myconfigmap.yml

apiVersion: v1
kind: ConfigMap
metadata:
  name: myconfigmap
data:
  APP_COLOR: blue
  APP_MODE: prod

then you inject into a container definition using

envFrom: 
- configMapRef
    name: myconfigmap

kubectl get configmaps
kubectl describe configmaps db-config

Secrets

kubectl create secret generic mysecret --from-literal=mykey=myvalue

apiVersion: v1
kind: Secret
metadata:
  name: app-secret
data:
  DBHost: mysql
  DBUser: root
  DBPassword: password

kubectl create -f secret_data.yaml

SECURITY

https://kubernetes.io/docs/tasks/configure-pod-container/security-context/

you can declare at Pod or container level:

spec:
  securityContext:
    runAsUser: 1000
    capabilities:
      add: ["MAC_ADMIN"]

#check which user runs the container
kubectl exec ubuntu-sleeper whoami



kubectl create serviceaccount dashboard-sa
kubectl get serviceaccount
kubectl describe serviceaccount dashboard-sa
kubectl describe secret dashboard-sa-account-token

curl https://myip/api -insecure --header "Authorization: Bearer PASTE_THE_TOKEN_HERE"