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

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

piling up at the bottleneck.” Resource Utilization “The wait time is the ‘percentage of time busy’ divided by the ‘percentage of time idle.’ In other words, if a resource is fifty percent busy, then if a resource is ninety percent busy, the wait time is ‘ninety percent divided by ten percent’, or nine hours. In other words, our task would wait in queue nine times longer than if the resource were

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

run in parallel iii. Generally, limit manual testing if automated tests haven’t passed iv. For resource intensive suites, performance tests, IA, execute as frequently as possible i. WRITE OUR AUTOMATED