k8s学习总结、记录（未完成）

一.什么是k8s：
全名kubenetes，容器编排工具，分布式的架构，能够对docker以及其他容器进行自动部署，弹性伸缩和管理
二.k8s的架构：
分布式的，一个master节点（属于是主节点）和多个node节点（计算节点），master就是领导不干实际的计算工作而是负责整体把关，node属于就是worker节点，接受指令干活的。
1、master节点包括五个大部分：
（1）kubectl：在cmd命令行操作指令的都是这个，属于是输入kubectl命令的入口
都有啥命令呢：

第一个命令

kubectl --help
然后就会显示都有啥命令如下：

Basic Commands (Beginner):
  create        Create a resource from a file or from stdin.
  expose        Take a replication controller, service, deployment or pod and expose it as a new Kubernetes Service
  run           Run a particular image on the cluster
  set           Set specific features on objects

Basic Commands (Intermediate):
  explain       Documentation of resources
  get           Display one or many resources
  edit          Edit a resource on the server
  delete        Delete resources by filenames, stdin, resources and names, or by resources and label selector

Deploy Commands:
  rollout       Manage the rollout of a resource
  scale         Set a new size for a Deployment, ReplicaSet or Replication Controller
  autoscale     Auto-scale a Deployment, ReplicaSet, or ReplicationController

Cluster Management Commands:
  certificate   Modify certificate resources.
  cluster-info  Display cluster info
  top           Display Resource (CPU/Memory/Storage) usage.
  cordon        Mark node as unschedulable
  uncordon      Mark node as schedulable
  drain         Drain node in preparation for maintenance
  taint         Update the taints on one or more nodes

Troubleshooting and Debugging Commands:
  describe      Show details of a specific resource or group of resources
  logs          Print the logs for a container in a pod
  attach        Attach to a running container
  exec          Execute a command in a container
  port-forward  Forward one or more local ports to a pod
  proxy         Run a proxy to the Kubernetes API server
  cp            Copy files and directories to and from containers.
  auth          Inspect authorization

Advanced Commands:
  diff          Diff live version against would-be applied version
  apply         Apply a configuration to a resource by filename or stdin
  patch         Update field(s) of a resource using strategic merge patch
  replace       Replace a resource by filename or stdin
  wait          Experimental: Wait for a specific condition on one or many resources.
  convert       Convert config files between different API versions
  kustomize     Build a kustomization target from a directory or a remote url.

Settings Commands:
  label         Update the labels on a resource
  annotate      Update the annotations on a resource
  completion    Output shell completion code for the specified shell (bash or zsh)

Other Commands:
  alpha         Commands for features in alpha
  api-resources Print the supported API resources on the server
  api-versions  Print the supported API versions on the server, in the form of "group/version"
  config        Modify kubeconfig files
  plugin        Provides utilities for interacting with plugins.
  version       Print the client and server version information

一样一样来，先看最简单的-------比如查看的命令：

1.1 查询集群中的所有namespace
kubectl get namespaces

1.2 查看所有pod
kubectl get po -A

（2）Api-Server：
简洁的说就是 内部外部都是它交互，具备验证和授权，只有它能和etcd交互，属于是matser的大脑
如果master是领导，那么apiserver就是老板的大脑，这个属于是k8s暴露给外部接口的组件，只有它能和etcd组件交互，所有关于资源的操作，全部通过它来调配，也可以理解为，根据这个名字，这个k8s属于一个server，然后客户端想操作k8s这个server就是http去调用接口么，后续逻辑就是内部处理了，然后Api-Server有很多机制包括：认证、授权、访问控制、api注册、发现
（3）controller-manager：k8s集群内部的所有controller的管理员，