Материал из курса: Learn DevOps: The Complete Kubernetes Course

Делаю:
25.03.2019

Материал из курса:

Learn DevOps: The Complete Kubernetes Course

Выпоняю после каждого шага:

$ minikube stop
$ minikube delete
$ minikube start

Подготовка

$ minikube start
$ mkdir ~/kubernetes-test1 && cd ~/kubernetes-test1
$ git clone https://github.com/wardviaene/kubernetes-course
$ cd kubernetes-course

port-forward

$ kubectl create -f first-app/helloworld.yml

$ kubectl get pods
$ kubectl describe pod nodehelloworld.example.com
$ kubectl port-forward nodehelloworld.example.com 8081:3000

$ curl localhost:8081
Hello World!

$ ^C

Service

$ kubectl expose pod nodehelloworld.example.com  --type=NodePort --name helloworld-service

$ minikube service helloworld-service --url

http://192.168.99.106:31141

$ kubectl get service
$ kubectl describe service helloworld-service

Load Balancer

$ kubectl create -f first-app/helloworld.yml
$ kubectl create -f first-app/helloworld-service.yml

$ minikube service helloworld-service --url
http://192.168.99.107:31975

$ curl http://192.168.99.107:31975
Hello World!

Replication Controller

$ kubectl create -f replication-controller/helloworld-repl-controller.yml

$ kubectl get pods

NAME READY STATUS RESTARTS AGE
helloworld-controller-swghp 1/1 Running 0 80s
helloworld-controller-zq8m4 1/1 Running 0 80s

$ kubectl scale --replicas=4 -f replication-controller/helloworld-repl-controller.yml

$ kubectl get rc
NAME                    DESIRED   CURRENT   READY   AGE
helloworld-controller   4         4         4       4m38s

$ kubectl delete rc/helloworld-controller

Deployments

$ kubectl create -f deployment/helloworld.yml

$ kubectl get deploymentsNAME                    READY   UP-TO-DATE   AVAILABLE   AGE
helloworld-deployment   3/3     3            3           20s

$ kubectl get rs
NAME                              DESIRED   CURRENT   READY   AGE
helloworld-deployment-969d5cbd5   3         3         3       73s

$ kubectl get pods
NAME                                    READY   STATUS    RESTARTS   AGE
helloworld-deployment-969d5cbd5-65zdw   1/1     Running   0          99s
helloworld-deployment-969d5cbd5-74mt9   1/1     Running   0          99s
helloworld-deployment-969d5cbd5-rs2s9   1/1     Running   0          99s


$ kubectl get pods --show-labels
NAME                                    READY   STATUS    RESTARTS   AGE    LABELS
helloworld-deployment-969d5cbd5-65zdw   1/1     Running   0          2m4s   app=helloworld,pod-template-hash=969d5cbd5
helloworld-deployment-969d5cbd5-74mt9   1/1     Running   0          2m4s   app=helloworld,pod-template-hash=969d5cbd5
helloworld-deployment-969d5cbd5-rs2s9   1/1     Running   0          2m4s   app=helloworld,pod-template-hash=969d5cbd5


$ kubectl rollout status deployment/helloworld-deployment

$ kubectl expose deployment helloworld-deployment --type=NodePort
service/helloworld-deployment exposed

$ kubectl get service
NAME                    TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)          AGE
helloworld-deployment   NodePort    10.111.138.173   <none>        3000:30462/TCP   29s
kubernetes              ClusterIP   10.96.0.1        <none>        443/TCP          10h


$ minikube service helloworld-deployment --url
http://192.168.99.108:30462

$ curl http://192.168.99.108:30462
Hello World!

Поменяем версию

$ kubectl set image deployment/helloworld-deployment k8s-demo=wardviaene/k8s-demo:2

$ kubectl rollout status deployment/helloworld-deployment

$ curl http://192.168.99.108:30462
Hello World v2!

$ kubectl rollout history deployment/helloworld-deployment
deployment.extensions/helloworld-deployment
REVISION  CHANGE-CAUSE
1         <none>
2         <none>

Поменяем обратно

$ kubectl rollout undo deployment/helloworld-deployment

Services

$ kubectl create -f first-app/helloworld.yml
$ kubectl create -f first-app/helloworld-nodeport-service.yml

$ minikube service helloworld-service --url
http://192.168.99.109:31001

$ curl http://192.168.99.109:31001
Hello World!

$ kubectl delete svc helloworld-service

Labels

$ kubectl label nodes minikube hardware=high-spec

$ kubectl get nodes --show-labels

$ kubectl create -f deployment/helloworld-nodeselector.yml

$ kubectl describe pod helloworld-deployment-794c748d5b-lw877

Healthchecks

$ kubectl create -f deployment/helloworld-healthcheck.yml

Credentials

$ kubectl create -f deployment/helloworld-secrets.yml

$ kubectl create -f deployment/helloworld-secrets-volumes.yml

$ exec helloworld-deployment-blalbalba -i -t -- /bin/bash

$ cat /etc/creds/username
$ cat /etc/creds/password

Running Wordpress on Kubernetes (при перезагрузке данные потеряются!)

$ kubectl create -f wordpress/wordpress-secrets.yml

$ kubectl create -f wordpress/wordpress-single-deployment-no-volumes.yml

$ kubectl create -f wordpress/wordpress-service.yml

$ minikube service wordpress-service --url
http://192.168.99.111:31001

Service Discovery

$ kubectl create -f service-discovery/secrets.yml

$ kubectl create -f service-discovery/database.yml

$ kubectl create -f service-discovery/database-service.yml

$ kubectl create -f service-discovery/helloworld-db.yml

$ kubectl create -f service-discovery/helloworld-db-service.yml

$ minikube service helloworld-db-service --url

$ kubectl exec database -i -t -- mysql -u root -p

rootpassword

mysql> show databases;

mysql> use helloworld

mysql> show tables;

mysql> select * from visits;

mysql> exit

$ kubectl get svc
NAME                    TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)          AGE
database-service        NodePort    10.107.72.126   <none>        3306:30457/TCP   16m
helloworld-db-service   NodePort    10.111.22.17    <none>        3000:31937/TCP   14m
kubernetes              ClusterIP   10.96.0.1       <none>        443/TCP          74m


$ kubectl run -i --tty busybox --image=busybox --restart=Never -- sh

# nslookup database-service
# nslookup helloworld-db-service

ConfigMap

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

$ kubectl get configmap
NAME           DATA   AGE
nginx-config   1      32s


$ kubectl get configmap nginx-config -o yaml

$ kubectl create -f configmap/nginx.yml

$ kubectl create -f configmap/  nginx-service.yml

$ minikube service helloworld-nginx-service --url
http://192.168.99.112:31324

Ingress Controller

$ kubectl create -f ingress/ingress.yml
$ kubectl create -f ingress/nginx-ingress-controller.yml
$ kubectl create -f ingress/echoservice.yml
$ kubectl create -f ingress/helloworld-v1.yml
$ kubectl create -f ingress/helloworld-v2.yml

$ minikube ip
192.168.99.113

$ kubectl get pods

$ curl 192.168.99.113
default backend - 404

$ curl 192.168.99.113 -H 'Host: helloworld-v1.example.com'
Hello World!

$ curl 192.168.99.113 -H 'Host: helloworld-v2.example.com'
Hello World v2!

$ kubectl get svc
NAME                  TYPE        CLUSTER-IP     EXTERNAL-IP   PORT(S)        AGE
echoheaders-default   NodePort    10.96.161.76   <none>        80:30302/TCP   4m30s
helloworld-v1         NodePort    10.110.25.93   <none>        80:30303/TCP   4m25s
helloworld-v2         NodePort    10.96.91.129   <none>        80:30304/TCP   4m19s
kubernetes            ClusterIP   10.96.0.1      <none>        443/TCP        6m12s

Volumes

Используется AWS, я не стал изучать

Namespace quotas

$ kubectl create -f resourcequotas/resourcequota.yml
$ kubectl create -f resourcequotas/helloworld-no-quotas.yml

$ kubectl get deploy --namespace=myspace
$ kubectl get rs --namespace=myspace

$ kubectl delete deploy/helloworld-deployment --namespace=myspace

$ kubectl create -f resourcequotas/helloworld-with-quotas.yml

$ kubectl get quota --namespace=myspace

$ kubectl describe quota/compute-quota --namespace=myspace

$ kubectl delete deploy/helloworld-deployment --namespace=myspace

$ kubectl create -f resourcequotas/defaults.yml

$ kubectl describe limits limits --namespace=myspace

$ kubectl create -f resourcequotas/helloworld-no-quotas.yml

$ kubectl get pods --namespace=myspace