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

Success to SNS Publish Error to SNS Start End No Lambda functions Start End Serverless compute engine for containers Long-running Bring existing code Fully-managed orchestration AWS Fargate Serverless 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:

in the archives of the scrapy-users mailing list [http://groups.google.com/group/scrapy-users/], or post a question [http://groups.google.com/group/scrapy-users/]. Ask a question in the #scrapy IRC channel prices from a Google Base XML feed [http://base.google.com/support/bin/answer.py?hl=en&answer=59461] which requires registering a namespace: x.register_namespace("g", "http://base.google.com/ns/1.0") php?id=2> (referer: ) # ... Note that you can’t use the fetch shortcut here since the Scrapy engine is blocked by the shell. However, after you leave the shell, the spider will continue crawling where

in the archives of the scrapy-users mailing list [http://groups.google.com/group/scrapy-users/], or post a question [http://groups.google.com/group/scrapy-users/]. Ask a question in the #scrapy IRC channel prices from a Google Base XML feed [http://base.google.com/support/bin/answer.py?hl=en&answer=59461] which requires registering a namespace: sel.register_namespace("g", "http://base.google.com/ns/1.0") id=2> (referer: ) # ... Note that you can’t use the fetch shortcut here since the Scrapy engine is blocked by the shell. However, after you leave the shell, the spider will continue crawling where

in the archives of the scrapy-users mailing list [http://groups.google.com/group/scrapy-users/], or post a question [http://groups.google.com/group/scrapy-users/]. Ask a question in the #scrapy IRC channel prices from a Google Base XML feed [http://base.google.com/support/bin/answer.py?hl=en&answer=59461] which requires registering a namespace: x.register_namespace("g", "http://base.google.com/ns/1.0") php?id=2> (referer: ) # ... Note that you can’t use the fetch shortcut here since the Scrapy engine is blocked by the shell. However, after you leave the shell, the spider will continue crawling where

in the archives of the scrapy-users mailing list [http://groups.google.com/group/scrapy-users/], or post a question [http://groups.google.com/group/scrapy-users/]. Ask a question in the #scrapy IRC channel from a Google Base XML feed [https://support.google.com/merchants/answer/160589?hl=en&ref_topic=2473799] which requires registering a namespace: sel.register_namespace("g", "http://base.google.com/ns/1 http://example.net> (referer: None) ... Note that you can’t use the fetch shortcut here since the Scrapy engine is blocked by the shell. However, after you leave the shell, the spider will continue crawling where

in the archives of the scrapy-users mailing list [http://groups.google.com/group/scrapy-users/], or post a question [http://groups.google.com/group/scrapy-users/]. Ask a question in the #scrapy IRC channel prices from a Google Base XML feed [http://base.google.com/support/bin/answer.py?hl=en&answer=59461] which requires registering a namespace: sel.register_namespace("g", "http://base.google.com/ns/1.0") php?id=2> (referer: ) # ... Note that you can’t use the fetch shortcut here since the Scrapy engine is blocked by the shell. However, after you leave the shell, the spider will continue crawling where

in the archives of the scrapy-users mailing list [http://groups.google.com/group/scrapy-users/], or post a question [http://groups.google.com/group/scrapy-users/]. Ask a question in the #scrapy IRC channel prices from a Google Base XML feed [http://base.google.com/support/bin/answer.py?hl=en&answer=59461] which requires registering a namespace: x.register_namespace("g", "http://base.google.com/ns/1.0") php?id=2> (referer: ) # ... Note that you can’t use the fetch shortcut here since the Scrapy engine is blocked by the shell. However, after you leave the shell, the spider will continue crawling where

archives of the scrapy-users mailing list [https://groups.google.com/forum/#!forum/scrapy-users], or post a question [https://groups.google.com/forum/#!forum/scrapy-users]. Ask a question in the #scrapy runspider somefile.py, Scrapy looked for a Spider definition inside it and ran it through its crawler engine. The crawl started by making requests to the URLs defined in the start_urls attribute (in this case this mechanism, check out the CrawlSpider class for a generic spider that implements a small rules engine that you can use to write your crawlers on top of it. Storing the scraped data The simplest way

in the archives of the scrapy-users mailing list [http://groups.google.com/group/scrapy-users/], or post a question [http://groups.google.com/group/scrapy-users/]. Ask a question in the #scrapy IRC channel prices from a Google Base XML feed [http://base.google.com/support/bin/answer.py?hl=en&answer=59461] which requires registering a namespace: x.register_namespace("g", "http://base.google.com/ns/1.0") php?id=2> (referer: ) # ... Note that you can’t use the fetch shortcut here since the Scrapy engine is blocked by the shell. However, after you leave the shell, the spider will continue crawling where