Kubernetes-ops 🌀

School project to load balance and make some HA on a cluster Kubernetes installed with kubespray-ops project.

     )               (       )               (     
  ( /(        (      )\ ) ( /(      *   )    )\ )  
  )\())  (  ( )\ (  (()/( )\())(  ` )  /((  (()/(  
|((_)\   )\ )((_))\  /(_)|(_)\ )\  ( )(_))\  /(_)) 
|_ ((_) ((_|(_)_((_)(_))  _((_|(_)(_(_()|(_)(_))   
| |/ / | | || _ ) __| _ \| \| | __|_   _| __/ __|  
  ' <| |_| || _ \ _||   /| .` | _|  | | | _|\__ \  
 _|\_\\___/ |___/___|_|_\|_|\_|___| |_| |___|___/  

Made by FULCHIC Gaby

The project's core

To launch the project 👨🏼‍💻

kubectl create -f hello-world/

To stop it 🛑

kubectl delete -f hello-world/

More infos about Kubernetes for myself

Global commands

kubectl version
kubectl api-versions
kubectl get nodes

Namespaces

kubectl create -f ./gaby-namespace.yaml
kubectl delete namespaces gaby-namespace.yaml
kubectl get namespaces

• with a get pods

kubectl get pods --namespace=gaby

Context to stop using --namespace (<-config)

kubectl config view
kubectl config current-context
kubectl config set-context dev --namespace=yournamespace
kubectl config use-context dev

Deployments

kubectl run test1234 image=library/hello-world --port=XXXX
kubectl get deployments

• with a file

kubectl apply -f deployment.yaml

Services

kubectl expose deployment test1234 --type=LoadBalancer --port=8080 --target-port=8080
kubectl get services
kubectl describe theservice

Labels

You can set Labels in yaml file :D.
label:
name: it-prod-apps

With that you can manipulate some services or pods grouping them by their Labels.

kubectl -l name=it-prod-apps get services

Quotas / Resources

You can add quotas by using "resources" in the namespace.yml file. But you also create a file with a kind : ResourceQuota and you gonna create it using :

kubectl create -f ./resourcequota.yml --namespace=namespace
kubectl get quota --namespace=namespace
kubectl describe quota compute-resources-sample --namespace=namespace

Proxy

• To expose the API kube via a proxy

kubectl proxy --port=8080
curl http://localhost:8080/api/

• Get the pods from default namespaces for example

curl http://localhost:8080/api/v1/namespaces/default/pods

Begin with Kubernetes and Docker ✔️

Hello-world docker with k8s :

kubectl run test1234 --image=library/hello-world --port=8080

Expose it :

kubectl expose deployment test1234 --type=LoadBalancer --port=8080 --target-port=8080

Get the ip exposed, there are 2 commands :

kubectl get svc
kubectl get services

Clean all :

kubectl delete deployment test1234
kubectl delete svc test1234

To Monitor 📊

• Konstellate : https://github.com/containership/konstellate
• Kubelet : https://kubernetes.io/docs/reference/command-line-tools-reference/kubelet/
• Prometheus : https://coreos.com/operators/prometheus/docs/latest/