Operand or configures off- cluster resources • Operator waits for managed resources to reach a healthy state • Operator conveys readiness of application or managed resources to the user leveraging the status Resource • Operator reconciles configuration and updates to it with the status of the managed resources Upgrade of the managed workload • Operand can be upgraded in the process of upgrading the Operator the Operand • Operator implements fail-over and fail-back of clustered Operands • Operator supports add/removing members to a clustered Operand • Operator enables application-aware scaling of the

Boot Environments Rapidly Portable Ability to Move Containers Freely Lightweight Minimal Resources Needed Application Operating System Physical Infrastructure Containers and VMs - A Practical kube-controller-manager kube-scheduler • Key/Value Store • Leader based clustering • Can be clustered across Master Nodes • Contains all state known about cluster • Kubernetes Front-end Control Plane

allows us to do updates with different deployment strategies and operate our edge devices in a clustered fashion. It really does support distributed processing across devices.” Ben Reif Lead Developer

20-管理容器的计算资源 21-Kubernetes资源分配 22-将Pod分配到Node 23-容忍与污点 24-Secret 25-Pod优先级和抢占 26-Service 27-Ingress Resources 28-动态⽔平扩容 29-实战：使⽤K8s编排Wordpress博客 2 简介 Kubernetes开源书。不啰嗦了，JUST READ IT. GitHub地址：https://github Horizontal Pod Autoscaling Naming and discovering Balancing loads Rolling updates Monitoring resources Accessing and ingesting logs Debugging applications Providing authentication and authorization $GROUP_NAME/$VERSION （例如 apiVersion: batch/v1 ）。 ⽀持的API组的完整列表可详⻅：Kubernetes API reference 。 使⽤ custom resources 扩展API有两个⽀持的路径： 1. CustomResourceDefinition 适⽤于⾮常基本的CRUD需求的⽤户。 2. 即将推出：⽤户需要完整的Kubernetes API语法

rules: - apiGroups: [""] resources: ["services","endpoints","secrets"] verbs: ["get","list","watch"] - apiGroups: ["extensions"] resources: ["ingresses"] verbs: ["get","list" "watch"] - apiGroups: ["extensions"] resources: ["ingresses/status"] verbs: ["update"] - apiGroups: ["traefik.containo.us"] resources: ["middlewares"] verbs: ["get","list" ["traefik.containo.us"] resources: ["ingressroutes","traefikservices"] verbs: ["get","list","watch"] - apiGroups: ["traefik.containo.us"] resources: ["ingressroutetcps","ingressrouteudps"]

yaml # wget h�ps://raw.githubusercontent.com/projectcalico/calico/v3.26.1/manifests/custom- resources.yaml #创建控制器 Install the Tigera Calico operator and custom resource defini�ons # kubectl create 's/192.168.0.0\/16/10.244.0.0\/16/g' custom-resources.yaml #创建资源 Install Calico by crea�ng the necessary custom resource # kubectl create -f custom-resources.yaml #如果需要更改镜像，只能部署 后，只能更改相 #镜像获取方式，优先本地，后网络 拉取 #command: [ "/bin/sh", "-ce", "ping -c 3 1.1.1.1" ] #容器入口程序及参数 resources: requests: #资源需求，定义了容器所需要的最小资源量，便于调度，不 能小于jvm中的Xms memory: "256Mi"

Loodse Peng Xiao, Alauda Why a UI? 60% of survey takers use a UI to monitor or manage their resources in Kubernetes https://unsplash.com/ https://github.com/kubernetes/dashboard/issues /3256#issuecomment-437199403 ssues /3256#issuecomment-437199403 “At the start it was great to be able to visually see the resources and understand how they are grouped. This helped someone like me with a hands-on but visual learning Kubernetes in AWS, Azure, and on-prem Dashboard as a K8s learning tool Create, read, update, delete resources. Recent and upcoming features https://unsplash.com/ Features since 2016 KubeCon update ● Exec

13 labels: 14 app: wordpress 15 spec: 16 accessModes: 17 - ReadWriteOnce 18 resources: 19 requests: 20 storage: 20Gi 21 storageClassName: wordpress-sc-001 22 --- 23 28 labels: 29 app: wordpress 30 spec: 31 accessModes: 32 - ReadWriteOnce 33 resources: 34 requests: 35 storage: 20Gi 36 storageClassName: wordpress-sc-001 创建⼀个Secret变量存放MySQL密码 labels: 21 app: wordpress 22 spec: 23 accessModes: 75 24 - ReadWriteOnce 25 resources: 26 requests: 27 storage: 20Gi 28 --- 29 apiVersion: apps/v1 # for versions before

Patrickxie ( 谢谆志） Background Cloud has been the general trend. How to manage so many clusters ,resources and businesses How to ensure load balancing of cluster nodes 1 2 Improper resource requests expand horizontally more quickly and flexibly 4 Region1 How do you manage so many clusters ,resources and businesses Cluster1 Cluster2 Cluster2 … Region N … Cluster1 Cluster2 … Cluster2 Business Resource Product3 Used Resource Product4 Used Resource Product2 Pod Kube-scheduler No resources Pending DynamicQuota Cluster1 Cluster2 Cluster3 Product1 Quota Product1 Quota Product1 Quota

Build DevOps Solution Pod Job CronJob • k8s itself is NOT a PaaS or DevOps platform，but … • k8s resources that can be used to build DevOps solution Volumes ConfigMap Secret ResourceQuota / LimitRanges Env - Environment variable [] VolumeMounts - Files to be shared or persisted [] Resources - Resource requirement ActiveDeadlineSeconds Timeout of build task Lifecycle docker images • Use can define raw k8s job, more features can be enabled • Leverage all k8s resources and extensibility to fulfill various requirements, prompt innovation • New features of k8s may