Kops = Kubernetes per tutti -...

Kops = Kubernetes per tutti

Introduzione al cluster Kubernetes secondo Kops

di Valentino Pistis

Cagliari 27 Ottobre 2018

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Guasila

Software Engineer

Padre .......durante il tempo libero


Chi sono?!2


Cos'è un clusterWikipedia:

è un insieme di computer connessi tra loro tramite una rete telematica.

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https://it.wikipedia.org/wiki/Computer

https://it.wikipedia.org/wiki/Rete_telematica

https://it.wikipedia.org/wiki/Rete_telematica


Cos'è un cluster

cluster di computer fisici

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Cos'è un clustercomputer virtuali

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Cos'è un clustercluster di containers?

No...ma quasi...

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Cos'è un containerLXC -> linux containers

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Cos'è un containerWikipedia:

Linux Container...è un ambiente di virtualizzazione a container, che opera a livello del sistema operativo e permette di eseguire

diversi ambienti Linux virtuali isolati tra loro...

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https://it.wikipedia.org/wiki/Virtualizzazione

https://it.wikipedia.org/wiki/Sistema_operativo

https://it.wikipedia.org/wiki/Linux


Cos'è un container!9


KubernetesWikipedia: e' un sistema di orchestrazione e gestione di container.

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KubernetesArchitettura

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KubernetesPods

Un POD rappresenta un processo in esecuzione sul cluster kubernetes

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KubernetesDeployments

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KubernetesapiVersion: apps/v1kind: Deploymentmetadata: name: nginx-deployment labels: k8s-app: myappspec: replicas: 3 selector: matchLabels: k8s-app: myapp template: metadata: labels: k8s-app: myapp spec: containers: - name: nginx image: nginx:1.15.4 resources: limits: cpu: 200m memory: 700Mi requests: cpu: 100m memory: 500Mi ports: - containerPort: 80

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KubernetesServices

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KubernetesapiVersion: v1kind: Servicemetadata: labels: k8s-app: myapp name: myapp-service namespace: my-namespace annotations:spec: ports: - name: http port: 80 protocol: TCP targetPort: 80 - name: https port: 443 protocol: TCP targetPort: 80 selector: k8s-app: myapp sessionAffinity: None type: ClusterIP

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KubernetesIngress

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KubernetesapiVersion: extensions/v1beta1kind: Ingressmetadata: name: myapp-ingress namespace: my-namespace annotations:spec: rules: - host: myapp.org http: paths: - path: backend: serviceName: myapp-service servicePort: 80

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KubernetesPersistent Volumes

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KubernetesapiVersion: v1kind: PersistentVolumeClaimmetadata: name: pvc-my-disk namespace: my-namespacespec: accessModes: - ReadWriteOnce resources: requests: storage: 3Gi

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KubernetesHorizontal Pod Autoscaler

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KubernetesapiVersion: autoscaling/v2beta1kind: HorizontalPodAutoscalermetadata: name: myapp-hpa namespace: my-namespacespec: scaleTargetRef: apiVersion: apps/v1beta1 kind: Deployment name: myapp minReplicas: 1 maxReplicas: 10 metrics: - type: Resource resource: name: cpu targetAverageUtilization: 90 - type: Resource resource: name: memory targetAverageUtilization: 90

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KubernetesCluster Autoscaler

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KubernetesMonitoring e Logging

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KubernetesSite Reliability Engineering:

is a discipline that incorporates aspects of software engineering and applies that to IT operations problems

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https://en.wikipedia.org/wiki/Software_engineering

https://en.wikipedia.org/wiki/Information_technology_operations

https://en.wikipedia.org/wiki/Information_technology_operations


KubernetesCreazione cluster

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KopsCome funziona

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Kops!28


Kopsinstallare kops

macos: • brew update && brew install kops

Linux: • curl -LO https://github.com/kubernetes/kops/releases/download/$(curl -s

https://api.github.com/repos/kubernetes/kops/releases/latest | grep tag_name | cut -d '"' -f 4)/kops-linux-amd64

• chmod +x kops-linux-amd64• sudo mv kops-linux-amd64 /usr/local/bin/kops

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KopsIAM per kops

• aws iam create-group --group-name kops• aws iam attach-group-policy --policy-arn arn:aws:iam::aws:policy/AmazonEC2FullAccess --group-

name kops• aws iam attach-group-policy --policy-arn arn:aws:iam::aws:policy/AmazonRoute53FullAccess --group-

name kops• aws iam attach-group-policy --policy-arn arn:aws:iam::aws:policy/AmazonS3FullAccess --group-name

kops• aws iam attach-group-policy --policy-arn arn:aws:iam::aws:policy/IAMFullAccess --group-name kops• aws iam attach-group-policy --policy-arn arn:aws:iam::aws:policy/AmazonVPCFullAccess --group-

name kops• aws iam create-user --user-name kops• aws iam add-user-to-group --user-name kops --group-name kops• aws iam create-access-key --user-name kops

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KopsS3 Bucket per cluster state storage

• aws s3api create-bucket --bucket my-cluster-state-store --region aws-region --create-bucket-configuration LocationConstraint=aws-region

• aws s3api put-bucket-versioning --bucket my-cluster-state-store --versioning-configuration Status=Enabled`

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Kops

Un solo comando Kops per accendere Kubernetes su AWS: • kops create cluster --cloud aws --zones aws-zone my-cluster-name --yes

Un solo comando per distruggere: • kops delete cluster --name my-cluster-name --yes

Due comandi per aggiornare il cluster: • kops update cluster my-cluster-name --yes• kops rolling-update cluster my-cluster-name --yes

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Comandi utili• kops validate cluster

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Comandi utilivpistis@vpistisMacBookAir⎈ (my-kube-cluster-name|namespace) ~> kops validate cluster Using cluster from kubectl context: my-kube-cluster-name

Validating cluster my-kube-cluster-name

INSTANCE GROUPSNAME ROLE MACHINETYPE MIN MAX SUBNETSapp-nodes Node t2.large 1 20 eu-west-2bdb-nodes Node t2.large 1 8 eu-west-2bmaster-eu-west-2b Master c4.large 1 3 eu-west-2b

NODE STATUSNAME ROLE READYip-X-X-X-X.eu-west-2.compute.internal node Trueip-X-X-X-X..eu-west-2.compute.internal node Trueip-X-X-X-X..eu-west-2.compute.internal node Trueip-X-X-X-X..eu-west-2.compute.internal masterTrueip-X-X-X-X..eu-west-2.compute.internal node Trueip-X-X-X-X..eu-west-2.compute.internal node True

Your cluster my-kube-cluster-name is ready

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Comandi utili• kubectl top pods • kubectl top nodes • kubectl apply -f config-file.yaml

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Comandi utilikubectl top pods

NAME CPU(cores) MEMORY(bytes) deployment-name-xxxxxxx-xxxxxx 18m 53Mi

kubectl top nodes

NAME CPU(cores) CPU% MEMORY(bytes) MEMORY% ip-x-x-x-x.eu-west-2.compute.internal 415m 20% 5236Mi 66% ip-x-x-x-x.eu-west-2.compute.internal 108m 5% 4845Mi 61%

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KopsKubernetes Dashboard

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Kopse ora?

Docker: la tua applicazione web Load Balancer: Zalando skipper e aws ingress controller..Logging: Fluentd, Mongo, ElasticSearch... Monitoring: Prometheus, Grafana...

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Grazie!Valentino Pistis

github: @vpistis

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