[GitHub] kimmking opened a new issue #2043: [Proposal]support hostname or domain in service discovery.

[GitBox <gi...@apache.org>]

kimmking opened a new issue #2043: [Proposal]support hostname or domain in service discovery.
URL: https://github.com/apache/incubator-dubbo/issues/2043
 
 
   Hello, community,
           It's a nice way to support hostname or domain in service discovery, then we can gain more flexibility both developers and users.
   
   ## Problems
   in Dubbo, providers register their IP addresses to Registry Server like ZK/Redis etc. It will be difficult for these case: 
   - case A: When a provider deployed in a vm container such as Docker, consumers in  other computer can't access the IPs in container. 
   - case B: Across LANs(Local Area Network)，consumer can't touch another IP  in different LAN.
    
   ## Target
   solve problems to support case A & B
   
   ## Solution
   In case A and B, usually we map a proxy port from a remote IP or Container IP to a local IP out of network box.Then if dubbo support hostname or domain in service discovery directly, then we can modify /etc/hosts to redirect consumer's requests to the proxy port to invoke Service.
   
   ## Example
   
   - Configure Provider
   Configure protocol with a new attribute host：
   ```
   <dubbo:protocol name="dubbo" port="28080" host="www.example.com" />
   ```
   Then providers will register dubbo://www.example.com:28080/com.test.HelloService to registry servers.
   We also can config the host param in Service Config or Registry Config.
   
   - Configure Consumer
   Nothing need to configure except opening /etc/hosts and adding one line:
   www.example.com 10.1.1.3
   # assume 10.1.1.3 is the mapping proxy IP for real Provider IP
   
   
   

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