AWS云上迁移方法论

云迁移解决方案概述

常见的客户迁移驱动力

迁移策略：7R

7R迁移策略示例

云上架构的持续优化

总结
企业在建立了数字化战略之后，就会发现企业文化在转型中起着关键的作用。那么如何在企业建立创新文化呢？结合亚马逊的创新文化，长虹佳华认为主要在于四个方面。

1.架构（Architecture）

采用和创建支持快速成长和变革的结构，逐步采用云原生的架构，通过自服务平台，使用微服务架构实现开发运维一体化DevOps。

2.组织（Organization）

充分授权员工，让小而有能力的团队拥有他们所需要的资源并对他们负责的任务有足够的控制权。有一个形象的说法叫“两个披萨团队”。通常是多大规模的团队呢，如果订团队工作餐的话，两张披萨就够，也就是说，十人左右的规模。

3.机制（Mechanisms）

将创新思维编码进企业的DNA中，以客户为中心，以业务为导向，以终为始、逆向操作，持续改进持续部署。

4.文化（Culture）

雇佣具有创新和实干精神的建设者，鼓励他们创新和建设。用领导力准则培养和建立企业文化，规范倡导支持正面的行为。越来越多的企业从学习和借鉴亚马逊的创新文化入手，找到了适合他们自己的文化转型之路。

ref：The 7 R’s: Why infrastructure is critical to your application cloud migration (netapp.com)

Asset+1+eBook+Strategies+for+Accelerating+Migration+to+AWS.pdf (amazonaws.com.cn)

Overview – Best practices for assessing applications to be retired during a migration to the AWS Cloud (amazon.com)

The purpose of this guide is to provide best practices for applications categorized as “retire” in a migration plan for the Amazon Web Services (AWS) Cloud.

A critical first step in creating a migration strategy is collecting application portfolio data, such as extracts from a configuration management database. This data must be evaluated against the seven common migration strategies (7 Rs) for moving applications to the AWS Cloud. These strategies are refactor, replatform, repurchase, rehost, relocate, retain, and retire. For more information about the 7 Rs, see the 7 Rs entry in the AWS Prescriptive Guidance glossary.

After you complete this initial portfolio analysis, you should have an initial plan for how each application will be migrated. This plan should be regularly optimized for future migration waves and teams, based on lessons learned and new data that becomes available during the migration process. The following diagram illustrates the strategy planning process.

Deciding if applications should be retired can often become complex and involves a level of risk. This can result in action being postponed, especially if subject matter experts (SMEs) have left an organization. Also, documentation about legacy systems can be sparse.

However, identifying and retiring applications that are no longer useful helps boost your business case and directs your team’s attention toward maintaining resources that are more widely used. This guide outlines six best practices to use when assessing applications to be retired in your migration strategy.