Kubernetes разработчикам.

1. Что такое
?
Аухатов Артур aaukhatov@google.com

2. Kubernetes - это открытое программное обеспечение
для автоматизации развёртывания, масштабирования
и управления контейнеризированными
приложениями (из Википедии)
Kubernetes
2

3. Чем занимается Kubernetes?
Оркестрация приложений
• Автоматизированное развёртывание
• Авто-масштабирование
• Механизмы обновления без простоя
• Утилизация ресурсов
• Балансировка нагрузки
• Мониторинг жизнеспособности
• Обнаружение сервисов
3

4. Что такое контейнер?
Контейнер - это изолированная среда исполнения
для вашего приложения.
4

5. Virtualization vs. Containers
Container
5

6. Docker
6
DOCKER IMAGE
DOCKER CONTAINER
DOCKER CONTAINER
Template
Instances

7. Dockerfile
7
FROM registry.ngenie.mtsit.com/ngenie/alpine-java:8
COPY my-super-app.jar app.jar
ENTRYPOINT [“java”, “-jar”, “app.jar”]

8. Ключевые понятия в Kubernetes
• Master Node (aka master)
• Worker Node (aka node, worker, minion)
• kubelet
• kube-proxy
• etcd
• Scheduler
• kubectl
• Controller Manager
• Kubernetes Resources
8

9. Архитектура Kubernetes
9

10. 10
Kubernetes Resources
ConfigMap
Pod
Deployment
Service
ReplicaSet
Secret
PersistentVolume
PersistentVolumeClaim
Job
CronJob
Namespaces
StatefulSet
Ingress
DaemonSet

11. 11
Kubernetes Resources
ConfigMap
Pod
Deployment
Service
ReplicaSet
Secret
PersistentVolume
PersistentVolumeClaim
Job
CronJob
Namespaces
StatefulSet
Ingress
DaemonSet

12. Pod
12
Node
CONTAINER
Pod
CONTAINER
CONTAINER
Pod
CONTAINER

13. Pod
13
Node 1
Pod
Node 2
PodPod
Pod
Pod

14. 14
ReplicaSet
Node
ReplicaSet
replica: 2
selector:
microservice: ngenie-microblog
Pod
label:
microservice: ngenie-microblog Pod
label:
microservice: ngenie-microblog

15. 15
Deployment
Node
ReplicaSet
replicas: 2
selector:
microservice: ngenie-microblog
Pod
labels:
microservice: ngenie-microblog
Pod
labels:
microservice: ngenie-microblog
Deployment
replicas: 2
labels:
microservice: ngenie-microblog

16. 16
Service
Node
Service
selector:
microservice: ngenie-microblog
Pod 2
labels:
microservice: ngenie-microblog
Pod 1
labels:
microservice: ngenie-microblog

17. 17
Kubernetes Resource’s Manifest file
YAMLapiVersion: v1
kind: Namespace
metadata:
name: ngenie-microblog
Declarative management of Kubernetes Resources
using YAML files

18. 18
Deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: ngenie-microblog-v3.6
labels:
microservice-name: ngenie-microblog
version: "1.0"
ngenie-version: "3.6"
spec:
replicas: 1
selector:
matchLabels:
microservice-name: ngenie-microblog
strategy:
rollingUpdate:
maxSurge: 2
maxUnavailable: 0
type: RollingUpdate
template:
metadata:
labels:
microservice-name: ngenie-microblog
version: "1.0"
ngenie-version: "3.6"
spec:
containers:
- name: ngenie-microblog
image: registry/ngenie-microblog:3.6
imagePullPolicy: Always
ports:
- containerPort: 8081
name: web-port
volumeMounts:
- name: security-xml
mountPath: "conf/equip/security.xml"
subPath: security.xml
volumes:
- name: security-xml
secret:
secretName: security-conf

19. 19
Deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: ngenie-microblog-v3.6
labels:
microservice-name: ngenie-microblog
version: "1.0"
ngenie-version: "3.6"
spec:
replicas: 1
selector:
matchLabels:
microservice-name: ngenie-microblog
strategy:
rollingUpdate:
maxSurge: 2
maxUnavailable: 0
type: RollingUpdate
template:
metadata:
labels:
microservice-name: ngenie-microblog
version: "1.0"
ngenie-version: "3.6"
spec:
containers:
- name: ngenie-microblog
image: registry/ngenie-microblog:3.6
imagePullPolicy: Always
ports:
- containerPort: 8081
name: web-port
volumeMounts:
- name: security-xml
mountPath: "conf/equip/security.xml"
subPath: security.xml
volumes:
- name: security-xml
secret:
secretName: security-conf

20. 20
Deployment.yaml
apiVersion: apps/v1
kind: Deployment
metadata:
name: ngenie-microblog-v3.6
labels:
microservice-name: ngenie-microblog
version: "1.0"
ngenie-version: "3.6"
spec:
replicas: 1
selector:
matchLabels:
microservice-name: ngenie-microblog
strategy:
rollingUpdate:
maxSurge: 2
maxUnavailable: 0
type: RollingUpdate
template:
metadata:
labels:
microservice-name: ngenie-microblog
version: "1.0"
ngenie-version: "3.6"
spec:
containers:
- name: ngenie-microblog
image: registry/ngenie-microblog:3.6
imagePullPolicy: Always
ports:
- containerPort: 8081
name: web-port
volumeMounts:
- name: security-xml
mountPath: "conf/equip/security.xml"
subPath: security.xml
volumes:
- name: security-xml
secret:
secretName: security-conf

21. 21
Liveness & Readiness Probes
containers:
……
livenessProbe:
httpGet:
path: /equip-metrics/public/rest/liveness
port: web-port
initialDelaySeconds: 600
timeoutSeconds: 5
periodSeconds: 5
successThreshold: 1
failureThreshold: 3
readinessProbe:
httpGet:
path: /equip-metrics/public/rest/readiness
port: web-port
initialDelaySeconds: 300
timeoutSeconds: 5
periodSeconds: 5
successThreshold: 1
failureThreshold: 5

22. 22
Service.yaml
YAMLapiVersion: v1
kind: Service
metadata:
name: ngenie-microblog
spec:
type: NodePort
ports:
- name: web
port: 8081
targetPort: 8081
nodePort: 31086
selector:
microservice-name: ngenie-microblog

23. 23
Service.yaml
YAMLapiVersion: v1
kind: Service
metadata:
name: ngenie-microblog
spec:
type: NodePort
ports:
- name: web
port: 8081
targetPort: 8081
nodePort: 31086
selector:
microservice-name: ngenie-microblog

24. 24
Service.yaml
YAMLapiVersion: v1
kind: Service
metadata:
name: ngenie-microblog
spec:
type: NodePort
ports:
- name: web
port: 8081
targetPort: 8081
nodePort: 31086
selector:
microservice-name: ngenie-microblog
version: 1.0

25. 25
kubectl
kubectl apply -n my-namespace -f resources.yaml

26. 26
- Official Doc https://kubernetes.io/docs/home/
- Kubernetes in Action (book)
- Kubernetes Cookbook (book)
- Introduction in Kubernetes from Linux Foundation
(online course in edx.org)

27. Спасибо!