如何在Spring Cloud Zuul中配置路由

Question

In Spring Cloud Zuul server we can define all routes which need be redirected via "application.properties".

For example:

zuul.routes.resource.path=/api/**
zuul.routes.resource.url=http://api.com:9025

Once the fat jar is created the "application.properties" is encapsulated into jar, and it's not possible to edit and reload the rules inside the file.

Is there any to inform Zuul about the routes in an external file, and at the same time reload them without stopping the server?

Answer 1

You can use spring cloud config for that.

Spring Cloud Config provides server and client-side support for externalized configuration in a distributed system. With the Config Server you have a central place to manage external properties for applications across all environments

http://cloud.spring.io/spring-cloud-config/spring-cloud-config.html#_spring_cloud_config_client

Answer 2

...a bit late to the party, but...

You can do all that you want with the ConfigServer!

1. Create an application.yml for config that is common across ALL applications
2. Create profile specific application-mycommonprofile.yml. As 1. but for the 'mycommonprofile' profile.
3. Create an appX.yml for each application that is specific to that application.
4. Create profile specific appX-myprofile.yml. As 3. but for the 'myprofile' profile.

All of these files are optional and are not dependent on any others. You can have an application-mycommonprofile.yml without an application.yml for example.

Hope that helps!

Answer 3

Another late-to-the-party answer, but another way is to use a profile config file, which lives in the filesystem, outside the fatjar.

If the configuration name of your Zuul proxy is 'zuul' and your normal config file is 'zuul.properties' or 'zuul.yaml', then it looks for a profile-specific config file in 'zuul-.properties' or 'zuul-.yaml'. If you do not specify a profile, then the profile named 'default' is active.

So you can load properties from an external file name 'zuul-default.properties' or 'zuul-default.yaml' (or 'zuul-default.yml', if you use a 3-letter filename extension). This will then be loaded when no other profile is specified.