githubusercontent.com/projectcalico/calico/v3.26.1/manifests/custom- resources.yaml #创建控制器 Install the Tigera Calico operator and custom resource defini�ons # kubectl create -f �gera-operator.yaml -i 's/192.168.0.0\/16/10.244.0.0\/16/g' custom-resources.yaml #创建资源 Install Calico by crea�ng the necessary custom resource # kubectl create -f custom-resources.yaml #如果需要更改镜像，只能部署 读操作一般都是升序或者降序 ③HTTP Server: 为告警和绘图提供查询接口 Promethus通过PromQL语句查询指标信息，并在页面展示。虽然Prometheus自 带UI界面，但是大多数是使用Grafana进行绘图展示。另外也可通过API接口来给 第三方软件提供监控指标。alertmanager组件负责邮件报警。 ★部署Prometheus 部署清单文件下载：

Implement Feature Toggles 1. Selectively enable/disable features without code deployments 2. Wrap UI or application logic in conditional statements or strategy patterns 3. Support easy roll back 4

development have changed: Changed in a way that now favors “building” over “buying.” There are now ways of custom-developing systems that preserve many of the advantages of buying off the shelf.  The risk of hard to change.  The advantages of the agility that can be gained through a flexible, changeable, custom system —a smooth rather than a lumpy EA, as we put it in the last chapter—are becoming morecompelling The cost of custom development is falling: More and more logic is abstracted away by frameworks and design patterns. Incremental delivery and staged investments reduce cost and risk.  Custom code is almost

into an EA, and when we realize that the costs and risks of custom development have been radically reduced, the economics often now favor custom development. Governance and Oversight: Governance has traditionally