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kubernetes (Why kubernetes (easily deploy as many instances of your…

- - - - ETCD cluster
        
        Database that stores information in a key value format
        
        Information about
        
        worker nodes
        
        what containers is on which node
        
        what time the container was loaded
      - kube-scheduler
        
        Responsible for scheduling app or container on nodes
        
        Identify the right node to place the container on
        
        Based on
        
        the container's resources requirements
        
        Worker nodes capacity
        
        Others policies
      - kube-controller-manager
        
        Takes care of different areas
        
        Types
        
        Node-Controller
        
        Takes care of nodes
        
        Responsible for adding new nodes to the cluster
        
        handling situations where nodes become unavailable or gets destroyed
        
        Replication-Controller
        
        Ensures that the desired nb of containers are running at all times in your repetitions
      - kube-apiserver
        
        Orchestration all operation within the cluster
        
        It exposes the kubernetes api which is used by
        
        external users to perform management operations on the clusters
        
        controllers to monitor the state of the cluster and make necessary changes as requireed
        
        Worker nodes to communicate with the server
  - - - Host application as container
    - - kubelet
        
        listen for instructions from kube-apiserver and manages containers
        
        Agent that runs on each nodes
        
        kube-apiserver periodically fetches status reports from the kublets to monitor the status of nodes and containers on them
        
        => Deploys or destroys containers on the nodes
      - kube-proxy
        
        helps in enabling communication between services within the worker nodes
        
        enables communication between worker nodes
        
        To allow the containers of different worker nodes to reach each others
      - Container-runtime-engine
        
        The software that can run container.
        
        Docker
        
        Other than docker