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Docker and kubernetes_introduction
The document provides an introduction to containers, Docker, and Kubernetes, explaining their fundamental concepts and functionalities. It covers various aspects of containerization such as building blocks, runtimes, orchestration features, and deployment strategies. Additionally, it elaborates on Kubernetes components, storage methods, monitoring, and advanced deployment topics.
In this document
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Basics of Containers, Docker, and Kubernetes as an introduction to container technology.
Explains containers' characteristics, runtimes, and specifications provided by the Open Container Project.
Basic introduction to Docker and its significance within containerization.
Insight into Docker images, Dockerfile structures, network configurations, and service discovery options.
Docker Swarm features including load balancers, service routing, and examples of deployment stacks.
Overview of Kubernetes for container orchestration, deployment, scaling, and management.
Details on Kubernetes components including the API server and scheduler, along with deployment strategies.
Definition of Kubernetes Pods, their roles, health check mechanisms, and deployment strategies.
Methods of service exposure in Kubernetes including NodePort, LoadBalancer, and Ingress configurations.
Management of storage in Kubernetes including PersistentVolumes, Claims, and cloud-provider integration.
The use of ConfigMaps in separating application code from configuration management.
Tools for monitoring within Kubernetes and advanced deployment strategies like blue-green deployments.
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Docker and kubernetes_introduction
- 1. Container Docker and Kubernetes Anintroduction of basics
- 2. Contents Container Docker Kubernetes
- 3. Container What isContainer? • isolated • include all required files • portable • lightweight VM • share host kernel referance: https://www.redhat.com/en/topics/containers/whats-a-linux-container
- 4. Container * kubernetes: removethe Container Daemon
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- 6. Container Building Blocks •Control groups • CPU/Memory/Disk IO • namespace • pid/net/mnt/user etc.. • Storage • Copy-on-Write • AUFS, overlay FS
- 7. Container Runtimes • LXC •Docker Engine • rkt(CoreOS--App Container) • runC(Open Container Project--OCP) • OpenVZ • Jails/Zones
- 8. Container Open ContainerProject(OCP) • Open Container Initiative (OCI) • the Runtime Specification (runtime-spec) and the Image Specification (image-spec) CNI and CNM • Docker vs CoreOS(Google) referance:https://www.opencontainers.org/about referance:https://thenewstack.io/container-networking-landscape-cni- coreos-cnm-docker/
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- 14. Docker Network • bridge/overlay/host/none Storage • bind mounts Service Discovery & Load Balancing • DNS based
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- 16. Docker--Pid 1 andSignal referance: https://github.com/Yelp/dumb-init
- 17. Docker--Swarm Docker Swarm •simple to create • limited ability(auto-scaling, cloud-integration,multi-user, log) Full Production Environment Stack • Nginx as Frontend load balancer and Service Router • Consul+Consul-template to update Nginx config and reload Nginx • registrator on every worker node • logspout+ELK • NFS as storage persistent solution • cAdvisor+Node_exporter+Prometheus
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- 22. kubernetes Why Kubernetes? •automate deployment, scaling, and management of containerized applications • container orchestration • new era of infrastructure • Docker Swarm/Rancher/Mesos feature • auto-failover/Blue-Green/Rollback • Service Discovery/Load Balance • Cloud-Integration • multi-namespace • Support from Google/Redhat/IBM
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- 25. kubernetes--Components API Server Scheduler Control Manager etcd kubelet kube-proxy
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- 27. kubernetes Pod Deployment/ReplicaSets DaemonSet(nginx as Ingress) StatefulSets CronJob Service
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- 31. kubernetes--pod the smallestand simplest unit shared storage/network routable IP address one or more containers
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- 33. kubernetes--pod HealthCheck • LivenessProbes • Readiness Probes https://matthewpalmer.net/kubernetes-app-developer/articles/multi-container-pod-design- patterns.html
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- 36. kubernetes--Expose Service NodePort Ingress(Nginx and ConfigMap) LoadBalancer(OpenStack,AWS,GCE,AliCloud) kube-proxy • iptables vs ipvs
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- 40. kubernetes--storage Volume PersistentVolume:a resource like a node in a cluster PersistentVolumeClaims: request for PV static/dynamic PVs • StorageClasses cloud-provider
- 41. kubernetes--storage Static PVsand PVCs
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- 43. kubernetes--ConfigMap separate applicationcode from configuration examples: • redis example:https://kubernetes.io/docs/tutorials/configuration/configure-redis-using- configmap/ • nginx example: https://kubernetes.io/docs/tutorials/configuration/configure-redis- using-configmap/
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- 45. kubernetes--monitor Host Monitor •zabbix/node_exporter Pod Monitor • cAdvisor Heapster ELK Horizontal Pod Autoscaler(HPA)
- 46. kubernetes--Advanced Topics Blue-green/Canarydeployment Service Mesh helm(rpm,apt) http://blog.christianposta.com/deploy/blue-green-deployments-a-b-testing-and-canary- releases/