developer intro to - github pageszielona-gora-jug.github.io/files/kubernetes.pdf · 2020. 6....
TRANSCRIPT
![Page 1: DEVELOPER INTRO TO - GitHub Pageszielona-gora-jug.github.io/files/Kubernetes.pdf · 2020. 6. 11. · spec: containers: - name: monitoring image: xxx/graphite-grafana:0.2.0 ports:](https://reader034.vdocuments.site/reader034/viewer/2022051823/5fed48dfa69c4f2cc2191ead/html5/thumbnails/1.jpg)
DEVELOPER INTRO TO
@dpokusa
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O CZYM BĘDZIE?
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O CZYM BĘDZIE?
● Czym jest i jak działa kubernetes?
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O CZYM BĘDZIE?
● Czym jest i jak działa kubernetes?
● Jak zacząć pracować z kubernetesem?
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O CZYM BĘDZIE?
● Czym jest i jak działa kubernetes?
● Jak zacząć pracować z kubernetesem?
● Dlaczego i kiedy warto rozważyć kubernetesa?
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O CZYM BĘDZIE?
● Czym jest i jak działa kubernetes?
● Jak zacząć pracować z kubernetesem?
● Dlaczego i kiedy warto rozważyć kubernetesa?
● Codzienna praca z kubernetesem z
perspektywy programisty
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O CZYM BĘDZIE?
● Czym jest i jak działa kubernetes?
● Jak zacząć pracować z kubernetesem?
● Dlaczego i kiedy warto rozważyć kubernetesa?
● Codzienna praca z kubernetesem z
perspektywy programisty
● Garść doświadczeń
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O CZYM NIE BĘDZIE?
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O CZYM NIE BĘDZIE?
● Jak zarządzać produkcyjnym środowiskiem*
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O CZYM NIE BĘDZIE?
● Jak zarządzać produkcyjnym środowiskiem*
● Jak wygląda codzienna praca od strony OPSa*
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O CZYM NIE BĘDZIE?
● Jak zarządzać produkcyjnym środowiskiem*
● Jak wygląda codzienna praca od strony OPSa*
● Dyskusji o tym czy dockeryzować bazy danych
czy nie :)
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O CZYM NIE BĘDZIE?
● Jak zarządzać produkcyjnym środowiskiem*
● Jak wygląda codzienna praca od strony OPSa*
● Dyskusji o tym czy dockeryzować bazy danych
czy nie :)
● Dyskusji o tym dlaczego nie dokeryzować Kafki
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O CZYM NIE BĘDZIE?
● Jak zarządzać produkcyjnym środowiskiem*
● Jak wygląda codzienna praca od strony OPSa*
● Dyskusji o tym czy dockeryzować bazy danych
czy nie :)
● Dyskusji o tym dlaczego nie dokeryzować Kafki
● Szczegółow Ingressa i LB*
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KUBERNETES
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KUBERNETES
● Projekt został uruchomiony w 2014
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KUBERNETES
● Projekt został uruchomiony w 2014
● Oparty o ponad 10 letnie doświadczenie (“Borg”)
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KUBERNETES
● Projekt został uruchomiony w 2014
● Oparty o ponad 10 letnie doświadczenie (“Borg”)
● Pierwszy “release” w Lipcu 2015
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KUBERNETES
● Projekt został uruchomiony w 2014
● Oparty o ponad 10 letnie doświadczenie (“Borg”)
● Pierwszy “release” w Lipcu 2015
● 100% Open Source
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KUBERNETES
● Projekt został uruchomiony w 2014
● Oparty o ponad 10 letnie doświadczenie (“Borg”)
● Pierwszy “release” w Lipcu 2015
● 100% Open Source
● Go
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KUBERNETES
● Projekt został uruchomiony w 2014
● Oparty o ponad 10 letnie doświadczenie (“Borg”)
● Pierwszy “release” w Lipcu 2015
● 100% Open Source
● Go
● Z greckiego “Sternik” (helmsman or pilot)
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DESIRED STATE MANAGEMENT
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MASTERK8s Cluster Services
API
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MASTERK8s Cluster Services
ControllerManagerScheduler
ETCD
API
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MASTERK8s Cluster Services
ControllerManagerScheduler
ETCD
API
NO
DE
1N
OD
E 2
NO
DE
3
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MASTERK8s Cluster Services
ControllerManagerScheduler
ETCD
API
NO
DE
1N
OD
E 2
NO
DE
3
KUBLET
KUBLET
KUBLET
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MASTERK8s Cluster Services
ControllerManagerScheduler
ETCD
API
NO
DE
1N
OD
E 2
NO
DE
3
KUBLET
Kube-proxy
Kube-proxy
Kube-proxy
KUBLET
KUBLET
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MASTERK8s Cluster Services
ControllerManagerScheduler
ETCD
API
NO
DE
1N
OD
E 2
NO
DE
3
KUBLET
Kube-proxy
Kube-proxy
Kube-proxy
KUBLET
KUBLET
cAdvisor
cAdvisor
cAdvisor
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MASTERK8s Cluster Services
ControllerManagerScheduler
ETCD
API
NO
DE
1N
OD
E 2
NO
DE
3
KUBLET
Kube-proxy
Kube-proxy
Kube-proxy
KUBLET
KUBLET
cAdvisor
cAdvisor
cAdvisor
POD
POD
POD
POD
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POD
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http://blog.arungupta.me/wp-content/uploads/2015/07/kubernetes-key-concepts.png
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apiVersion: v1kind: Podmetadata: name: my-pod labels: component: my-podspec: containers: - image: some-image:1.0 name: my-pod ports: - containerPort: 8080
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kubectl
kubectl create
kubectl delete
kubectl get
kubectl describe
kubectl logs
kubectl exec
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SERVICE
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kind: ServiceapiVersion: v1metadata: name: my-servicespec: selector: app: MyApp ports: - protocol: TCP port: 80 targetPort: 9376
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POD A
POD A
POD B
POD B
POD B
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POD A
POD A
POD B
POD B
POD B
A
B
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POD A
POD B
POD B
POD B
A
B
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POD A
POD B
POD B
POD B
A
B POD A
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POD A
POD B
A
B POD A
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kind: ServiceapiVersion: v1metadata: name: my-service namespace: prodspec: type: ExternalName externalName: my.database.example.com
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POD A
POD B
A
B POD A
C
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POD A
POD B
A
B POD A
C
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POD A
POD B
A
B POD A
C
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LET’S START!
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https://github.com/kubernetes/minikube
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$ minikube start
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$ minikube start --memory=6000
VT-x enabled in BIOSInstalled kubectl
Virtualization system installed(virtualbox, vmwarefusion, KVM, xhyve, Hyper-V)
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➜ minikube startStarting local Kubernetes v1.7.5 cluster...Starting VM...Getting VM IP address...Moving files into cluster...Setting up certs...Connecting to cluster...Setting up kubeconfig...Starting cluster components...Kubectl is now configured to use the cluster.
talks/dev-intro-to-kubernetes/kubernetes on master took 1m 2s
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eval $(minikube docker-env)
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DASHBOARD
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Service DISCOVERY
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kubectl run curl --image=radial/busyboxplus:curl -i --tty
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DEPLOYMENT
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apiVersion: apps/v1beta2kind: Deploymentmetadata: name: nginx-deployment labels: app: nginxspec: replicas: 3 selector: matchLabels: app: nginx template: metadata: labels: app: nginx spec: containers: - name: nginx image: nginx:1.7.9 ports: - containerPort: 80
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ROLLING UPDATE
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A
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A
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A
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A
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A
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A
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$ kubectl set image deployment/nginx-deployment nginx=nginx:1.91
$ kubectl rollout status deployments nginx-deployment
$ kubectl rollout history deployment/nginx-deployment
$ kubectl rollout undo deployment/nginx-deployment
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#[Mean = 907.002, StdDeviation = 861.077]#[Max = 4313.088, Total count = 7625]#[Buckets = 27, SubBuckets = 2048]---------------------------------------------------------- 7627 requests in 10.01s, 1.58MB readRequests/sec: 762.30Transfer/sec: 161.81KB
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#[Mean = 2866.439, StdDeviation = 2311.337]#[Max = 8552.448, Total count = 3342]#[Buckets = 27, SubBuckets = 2048]---------------------------------------------------------- 3344 requests in 10.01s, 709.26KB read Socket errors: connect 0, read 0, write 4, timeout 111Requests/sec: 333.96Transfer/sec: 70.83KB
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SCALING
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$ kubectl scale deployment nginx-deployment --replicas=5
$ kubectl autoscale deployment nginx-deployment --min=10 --max=15 --cpu-percent=80
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SECRETS
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kubectl create secret generic mongodb-credentials --from-literal=username=user –from-literal=password=pass
spec: containers: - name: my-app image: my-app:0.0.1-SNAPSHOT ports: - containerPort: 8080 env: - name: LOG_APPENDER value: Console - name: HRPROJECTS_MONGODB_PASSWORD valueFrom: secretKeyRef: name: mongodb-credentials key: password
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kubectl create secret generic mongodb-credentials --from-literal=username=user –from-literal=password=pass
spec: containers: - name: my-app image: my-app:0.0.1-SNAPSHOT ports: - containerPort: 8080 env: - name: LOG_APPENDER value: Console - name: HRPROJECTS_MONGODB_PASSWORD valueFrom: secretKeyRef: name: mongodb-credentials key: password
@Value("${hrprojects.mongodb.password}")private String password;
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YOU ARE READY!
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There is more!
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VOLUMES
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kind: PersistentVolumeapiVersion: v1metadata: name: graphite-storage-pv labels: type: localspec: accessModes: - ReadWriteOnce capacity: storage: 1000Mi hostPath: path: "/hosthome/dpokusa/tmp/graphite-minikube-storage"
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kind: PersistentVolumeClaimapiVersion: v1metadata: name: graphite-storage-claim labels: type: localspec: volumeName: graphite-storage-pv accessModes: - ReadWriteMany resources: requests: storage: 1000Mi
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spec: containers: - name: monitoring image: xxx/graphite-grafana:0.2.0 ports: - containerPort: 80 name: grafana - containerPort: 81 name: graphite - containerPort: 8125 name: statsd - containerPort: 8126 name: statsd-admin # statsD administrative port: 8126 volumeMounts: - mountPath: /opt/graphite/storage name: graphite-storage - mountPath: /opt/grafana/storage name: grafana-storage volumes: - name: graphite-storage persistentVolumeClaim: claimName: graphite-storage-claim - name: grafana-storage persistentVolumeClaim: claimName: grafana-storage-claim
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CONFIG MAPS
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kubectl create configmap spring-app-config --from-file=src/main/resources/application.properties
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JOBs
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apiVersion: batch/v1kind: Jobmetadata: name: pispec: template: metadata: name: pi spec: containers: - name: pi image: perl command: ["perl", "-Mbignum=bpi", "-wle", "print bpi(2000)"] restartPolicy: Never backoffLimit: 4
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PETS(Stateful Sets)
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apiVersion: apps/v1beta2kind: StatefulSetmetadata: name: webspec: selector: matchLabels: app: nginx # has to match .spec.template.metadata.labels serviceName: "nginx" replicas: 3 # by default is 1 template: metadata: labels: app: nginx # has to match .spec.selector.matchLabels
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spec: terminationGracePeriodSeconds: 10 containers: - name: nginx image: gcr.io/google_containers/nginx-slim:0.8 ports: - containerPort: 80 name: web volumeMounts: - name: www mountPath: /usr/share/nginx/html volumeClaimTemplates: - metadata: name: www spec: accessModes: [ "ReadWriteOnce" ] storageClassName: my-storage-class resources: requests: storage: 1Gi
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INGRESS
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Spring boot k8intergation
<dependency> <groupId>io.fabric8</groupId> <artifactId>spring-cloud-kubernetes-core</artifactId></dependency>
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Reccomended SOURCES
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● kubernetes.io
● http://blog.arungupta.me
● https://github.com/kubernetes/minikube
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ABOUT
software-empathy.pl
@dpokusa
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@dpokusa
ABOUT
SPREADIT.PL18.11.2017
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@dpokusa
ABOUT
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$ minikube stop
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Q&A
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$ minikube delete