用 Python 给 Kubernetes 写个控制器 主讲人： 张晋涛 个人介绍 Apache APISIX PMC Kubernetes Ingress NGINX maintainer Microsoft MVP 『 K8S 生态周报』发起人和维护者 GitHub：tao12345666333 Mail: zhangjintao@apache.org Agenda Agenda Kubernetes 中请求处理流程 什么是准入控制器 用 Python 实现准入控制器 与其他方案对比 Kubernetes 架构 kube-apiserver Kubernetes 集群的核心组件 处理集群内外的所有请求 Kubernetes 请求处理流程  API Handler 匹配处理链路（ /apis ）  认证 / 授权  Mutating 关操作的代码逻辑或者组件  （静态）准入控制器： Kubernetes 代码中携带，不可动 态调整的  动态准入控制器：利用 Kubernetes 提供的 MutatingAdmissionWebhook 和 ValidatingAdmissionWebhook 扩展点，由用户自行开发 的组件，接收 HTTP 回调。 为什么需要准入控制器  Kubernetes 中一系列复杂的校验 / 事务逻辑

•自动部署：ansible、saltstack、puppet •持续集成（CI）：Jenkins •配置管理：Ansible、Chef、Puppet、SaltStack •容器：Docker、kvm •编排：Kubernetes、openstack、Apache Mesos、swarm •服务注册与发现：Zookeeper、etcd、Consul •脚本语言：python、ruby、shell •日志管理：ELK、Logentries

0 LicenseUrl: LICENSE ReadmeUrl: README.md Labels: [demo','lambda','kubectl','eks', 'aws', 'kubernetes', 'k8s'] HomePageUrl: https://github.com/pahud/my-demo-sar-app SemanticVersion: 1.0.1 SourceCodeUrl:

7.0.1. Assignment operator 7.0.2. Arithmetic operator 7.0.3. Comparison operator 7.0.4. Boolean operator 7.0.5. Bitwise operator 7.0.6. is and in 8. The Ternary Operator 9. Strings 10. Booleans statement 40. Installing 3rd party packages using pip 41. List comprehensions 42. Polymorphism 43. Operator Overloading 44. Virtual Environments 1. Introduction to Python 5 Python is literally eating We can create a new Python variable by assigning a value to a label, using the = assignment operator. In this example we assign a string with the value "Roger" to the name label: name = "Roger"

caught. call_binop(context, operator, left, right) For intercepted binary operator calls (intercepted_binops()) this function 39 is executed instead of the builtin operator. This can be used to fine tune in version 2.6. call_unop(context, operator, arg) For intercepted unary operator calls (intercepted_unops()) this function is executed instead of the builtin operator. This can be used to fine tune the should be intercepted. Each operator that is added to this set (empty by default) is delegated to the call_binop() method that will perform the operator. The default operator callback is specified by binop_table

254 9.8 functools —高阶函数和可调用对象上的操作 . . . . . . . . . . . . . . . . . . . . . . . . . . 267 9.9 operator —标准运算符替代函数 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269 10 文件和目录访问 279 methods described in the 字 符串的方法 section. To output formatted strings use template strings or the % operator described in the String Formatting Operations section. In addition see the String Services section methods de- scribed in the 字符串的方法 section. To output formatted strings use template strings or the % operator described in the String Formatting Operations section. In addition see the String Services section

254 9.8 functools —高阶函数和可调用对象上的操作 . . . . . . . . . . . . . . . . . . . . . . . . . . 267 9.9 operator —标准运算符替代函数 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269 10 文件和目录访问 279 methods described in the 字 符串的方法 section. To output formatted strings use template strings or the % operator described in the String Formatting Operations section. In addition see the String Services section methods de- scribed in the 字符串的方法 section. To output formatted strings use template strings or the % operator described in the String Formatting Operations section. In addition see the String Services section

254 9.8 functools —高阶函数和可调用对象上的操作 . . . . . . . . . . . . . . . . . . . . . . . . . . 267 9.9 operator —标准运算符替代函数 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269 10 文件和目录访问 279 methods described in the 字 符串的方法 section. To output formatted strings use template strings or the % operator described in the String Formatting Operations section. In addition see the String Services section methods de- scribed in the 字符串的方法 section. To output formatted strings use template strings or the % operator described in the String Formatting Operations section. In addition see the String Services section

Condi�on()方法创建一个条件对象， 条件对象能让一个进程A暂停下来，等待另一个进程B的通知，当进程B 满足某个条件后通知进程A继续运行 import multiprocessing def operator_func(cond, name): cond.acquire() print(name + ": 我可以变更了吗？") cond.notify() # 发消息给Manager，唤醒一个挂起的线程 变更方案有问题，先不变更，先改方案") cond.notify() # 发消息给Operator，唤醒一个挂起的线程 cond.wait() # 等待Operator的回复 print(name + ": 好，可以变更了") cond.notify() # 发消息给Operator，唤醒一个挂起的线程 cond.release() def main(): cond = multiprocessing.Condition() opuser = multiprocessing.Process(target=operator_func, args=(cond, "cof-lee",)) mgmt = multiprocessing.Process(target=manager_func, args=(cond, "boss",))

309 10.2 functools —高阶函数和可调用对象上的操作 . . . . . . . . . . . . . . . . . . . . . . . . . . 323 10.3 operator —标准运算符替代函数 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329 11 文件和目录访问 337 会生成虚数（实部为零的复数），你可以将其与整数或浮点数相加来得到具有实部和虚部的复数。 Python fully supports mixed arithmetic: when a binary arithmetic operator has operands of different numeric types, the operand with the “narrower”type is widened to that token_specification = [ ('NUMBER', r'\d+(\.\d*)?'), # Integer or decimal number ('ASSIGN', r':='), # Assignment operator ('END', r';'), # Statement terminator ('ID', r'[A-Za-z]+'), # Identifiers ('OP', r'[+\-*/]')