Atualização do cluster Kubernetes sem tempo de inatividade

Processo de atualização para seu cluster Kubernetes

- Kubernetes . , . Kubernetes "Voluntary Disruption".

4 :

1. .
2. pod’ Kubernetes-
3. pod'
4. Kubernetes- PodDisruptionBudgets

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, Kubernetes .

, , . , lifecycle hooks, readiness probes Pod disruption budgets .

, . , Kubernetes , pod'a, Service:

pod’ Nginx Service Kubernetes-.

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• , pod’ . pod’ ? , , .
• ? pod’ .

pod’ , , . , ( VM), . pod’ , pod’. kubectl drain.

pod’

drain pod’ . drain unschedulable ( NoSchedule). pod’. drain pod’ , , TERM pod’.

kubectl drain pod’, , drain:

• TERM . pod’ , Kubernetes TERM , , , . , , pod’ , (, ).
• pod’, . , pod’ , .

voluntary disruption, , , drain , Kubernetes :

• Graceful termination
• Lifecycle hooks
• PodDisruptionBudgets

Kubernetes pod’. , :

---
apiVersion: apps/v1
kind: Deployment
metadata:
 name: nginx-deployment
 labels:
   app: nginx
spec:
 replicas: 2
 selector:
   matchLabels:
     app: nginx
 template:
   metadata:
     labels:
       app: nginx
   spec:
     containers:
     - name: nginx
       image: nginx:1.15
       ports:
       - containerPort: 80
---
kind: Service
apiVersion: v1
metadata:
 name: nginx-service
spec:
 selector:
   app: nginx
 ports:
 - protocol: TCP
   targetPort: 80
   port: 80

Deployment, pod’ nginx . , Service, pod’ nginx .

, , Kubernetes .

Kubernetes AWS , Gruntwork.io.

:

• Zero Downtime Deployment
• Kubernetes: ?
• Tekton Pipeline — Kubernetes- pipelines
• C Nginx
• Hashicorp Consul’s Kubernetes
• ClickHouse ClickHouse