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Spring Cloud Gateway 动态配置

Spring Cloud Gateway 的route路由配置需要能够灵活添加修改才有使用价值。

在线系统发布策略

Online project publishing generally has the following schemes:

1. Downtime release
   This kind of release is usually released at night or during major version upgrade. Because it needs to be stopped, now everyone is studying Devops scheme.

2. Blue green deployment
   Blue green deployment requires two identical environments. A new version of the environment, an old version of the environment, switches and rolls back through load balancing in order to reduce the service stop time.

3. Rolling deployment
   Rolling deployment is to start a new version, then stop an old version, then start a new version, and then stop an old version until the upgrade is completed. The default upgrade scheme based on k8s is rolling deployment.

4. Grayscale release
   Gray publishing is also called Canary publishing. In gray publishing, routing weights are often set according to users. For example, 90% of users keep using the old version, and 10% of users try the new version. Different versions of applications coexist and are often used together with A/B tests to test and select multiple schemes.

多实例部署时配置刷新策略

1. 要保持每个实例配置的稳定， 例如实例重启后， 配置不改变。
2. 多实例配置要保持一致。
3. 网关实例要部署在Openshift平台上， 配置获取不能从数据库获取。

参考网址：

https://docs.vmware.com/en/VMware-Spring-Cloud-Gateway-for-Kubernetes/index.html

https://www.jianshu.com/p/6ef55cfb2b81

https://www.tutorialspoint.com/spring_cloud/spring_cloud_gateway.htm

https://github.com/zulffaza/Spring-Cloud-Gateway-Routes-from-Database

https://huaweicloud.youkuaiyun.com/63311441d3efff3090b518a9.html?spm=1001.2101.3001.6650.1&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EOPENSEARCH%7Eactivity-1-86557165-blog-127522710.pc_relevant_vip_default&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EOPENSEARCH%7Eactivity-1-86557165-blog-127522710.pc_relevant_vip_default&utm_relevant_index=2

https://blog.youkuaiyun.com/lazasha/article/details/84942823?spm=1001.2101.3001.6650.2&utm_medium=distribute.pc_relevant.none-task-blog-2%7Edefault%7EOPENSEARCH%7ERate-2-84942823-blog-127522710.pc_relevant_vip_default&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2%7Edefault%7EOPENSEARCH%7ERate-2-84942823-blog-127522710.pc_relevant_vip_default&utm_relevant_index=3