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Kubernetes (component (Pod (Introduction (a group of one or more…

- - - - a group of one or more containers share with storage/network
      - Containers in different pods have distinct IP addresses and can not communicate by IPC without special configuration
      - Kubernetes 中最小的佈署單位
    - - If a node dies, the pods scheduled to that node are scheduled for deletion ( is not “rescheduled” to a new node;)
    - - Resource sharing and communication
        
        Pods enable data sharing and communication among their constituents
        
        shared storage volumes
  - - - defines a logical set of Pods and a policy by which to access them
      - is (usually) determined by a Label Selector
      - For Kubernetes-native applications, Kubernetes offers a simple Endpoints API that is updated whenever the set of Pods in a Service changes.
      - For non-native applications, Kubernetes offers a virtual-IP-based bridge to Services which redirects to the backend Pods
      - Kubernetes Services support TCP and UDP for protocols. The default is TCP
    - - Selector
        
        service has no selector, the corresponding Endpoints object will not be created
    - - implementing a form of virtual IP for Services.
      - Proxy-mode :userspace
        
        kube-proxy 監看 k8s master 的Service and Endpoint新增或移除
        
        https://d33wubrfki0l68.cloudfront.net/b8e1022c2dd815d8dd36b1bc4f0cc3ad870a924f/1dd12/images/docs/services-userspace-overview.svg
        
        clusterIP is shown as ServiceIP
      - Proxy-mode:iptables
        
        Service Object
        
        it installs iptables rules which capture traffic to the Service’s clusterIP (which is virtual) and Port and redirects that traffic to one of the Service’s backend sets
        
        Endpoints Object
        
        it installs iptables rules which select a backend Pod
        
        should be faster and more reliable than the userspace proxy.
        
        https://d33wubrfki0l68.cloudfront.net/837afa5715eb31fb9ca6516ec6863e810f437264/42951/images/docs/services-iptables-overview.svg
- - - - Deployment: <name>
      - 2.Replica Set: <name>-<rs>
      - Pod: <name>-<rs>-<randomString>
- - - - Public
      - Private
      - hybrid
      - multi-cloud
    - - Modular
      - Pluggable
      - Hookable
      - Composable
    - - Auto-placement
      - Auto-restart
      - Auto-replication
      - Auto-scaling