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docs/010-docker-and-kubernetes.md

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+# Docker in Production: Orchestration with Kubernetes
+
+Kubernetes (K8s) is an open-source container orchestration platform that automates the deployment, scaling, and management of containerized applications. It works well with Docker and provides a robust set of features for running containers in production.
+
+Kubernetes is a topic of its own, but here are some key concepts and best practices for using Kubernetes with Docker in production environments.
+
+## Key Kubernetes Concepts
+
+1. **Pods**: The smallest deployable units in Kubernetes, containing one or more containers.
+2. **Services**: An abstract way to expose an application running on a set of Pods.
+3. **Deployments**: Describe the desired state for Pods and ReplicaSets.
+4. **Namespaces**: Virtual clusters within a physical cluster.
+
+## Setting Up a Kubernetes Cluster
+
+You can set up a local Kubernetes cluster using Minikube:
+
+```bash
+minikube start
+```
+
+For production, consider managed Kubernetes services like Google Kubernetes Engine (GKE), Amazon EKS, or Azure AKS.
+
+## Deploying a Docker Container to Kubernetes
+
+1. Create a Deployment YAML file (`deployment.yaml`):
+
+```yaml
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: nginx-deployment
+spec:
+  replicas: 3
+  selector:
+    matchLabels:
+      app: nginx
+  template:
+    metadata:
+      labels:
+        app: nginx
+    spec:
+      containers:
+      - name: nginx
+        image: nginx:1.14.2
+        ports:
+        - containerPort: 80
+```
+
+2. Apply the Deployment:
+
+```bash
+kubectl apply -f deployment.yaml
+```
+
+3. Create a Service to expose the Deployment (`service.yaml`):
+
+```yaml
+apiVersion: v1
+kind: Service
+metadata:
+  name: nginx-service
+spec:
+  selector:
+    app: nginx
+  ports:
+    - protocol: TCP
+      port: 80
+      targetPort: 80
+  type: LoadBalancer
+```
+
+4. Apply the Service:
+
+```bash
+kubectl apply -f service.yaml
+```
+
+## Scaling in Kubernetes
+
+Scale your deployment easily:
+
+```bash
+kubectl scale deployment nginx-deployment --replicas=5
+```
+
+## Rolling Updates
+
+Update your application without downtime:
+
+```bash
+kubectl set image deployment/nginx-deployment nginx=nginx:1.16.1
+```
+
+## Monitoring and Logging
+
+1. View Pod logs:
+
+```bash
+kubectl logs <pod-name>
+```
+
+2. Use Prometheus and Grafana for monitoring:
+
+```yaml
+helm install prometheus stable/prometheus
+helm install grafana stable/grafana
+```
+
+## Kubernetes Dashboard
+
+Enable the Kubernetes Dashboard for a GUI:
+
+```bash
+minikube addons enable dashboard
+minikube dashboard
+```
+
+## Persistent Storage in Kubernetes
+
+Use Persistent Volumes (PV) and Persistent Volume Claims (PVC):
+
+```yaml
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: mysql-pv-claim
+spec:
+  accessModes:
+    - ReadWriteOnce
+  resources:
+    requests:
+      storage: 1Gi
+```
+
+## Kubernetes Networking
+
+1. **ClusterIP**: Exposes the Service on a cluster-internal IP.
+2. **NodePort**: Exposes the Service on each Node's IP at a static port.
+3. **LoadBalancer**: Exposes the Service externally using a cloud provider's load balancer.
+
+## Kubernetes Secrets
+
+Manage sensitive information:
+
+```bash
+kubectl create secret generic my-secret --from-literal=password=mysecretpassword
+```
+
+Use in a Pod:
+
+```yaml
+spec:
+  containers:
+  - name: myapp
+    image: myapp
+    env:
+    - name: SECRET_PASSWORD
+      valueFrom:
+        secretKeyRef:
+          name: my-secret
+          key: password
+```
+
+## Helm: The Kubernetes Package Manager
+
+Helm simplifies deploying complex applications:
+
+```bash
+helm repo add bitnami https://charts.bitnami.com/bitnami
+helm install my-release bitnami/wordpress
+```
+
+## Best Practices for Kubernetes in Production
+
+1. Use namespaces to organize resources.
+2. Implement resource requests and limits.
+3. Use liveness and readiness probes.
+4. Implement proper logging and monitoring.
+5. Regularly update Kubernetes and your applications.
+6. Use Network Policies for fine-grained network control.
+7. Implement proper RBAC (Role-Based Access Control).
+
+## Conclusion
+
+Kubernetes provides a powerful platform for orchestrating Docker containers in production environments. It offers robust features for scaling, updating, and managing containerized applications. While there's a learning curve, the benefits of using Kubernetes for production Docker deployments are significant, especially for large, complex applications.