GNS与VIP

为什么80%的码农都做不了架构师？>>>   

如果配置了GNS和DHCP，将允许使用动态的VIP。但是，private IP还是必须使用静态IP的。

客户端提交域名解析的请求给DNS，DNS 转发该请求给GNS，GNS将请求解析到集群的节点上。

If you use Grid Naming Service and DHCP to manage your network connections, then you may not need to configure address information on the cluster. Using GNS allows public Virtual Internet Protocol (VIP) addresses to be dynamic, DHCP-provided addresses. Clients submit name resolution requests to your network’s Domain Name Service (DNS), which forwards the requests to the grid naming service (GNS), managed within the cluster. GNS then resolves these requests to nodes in the cluster. If you do not use GNS, and instead configure networks manually, then public VIP addresses must be statically configured in the DNS, VIPs must be statically configured in the DNS and hosts file, and private IP addresses require static configuration.

Updated: 8th May 2013 21:23:00

client端通过域名连接db server，client将对域名的解析的请求交给DNS，但是，注意，RAC节点用的是DHCP VIP，也就是动态的VIP，所以DNS并不知道集群的VIP分配情况，因此DNS再将请求forward给GNS，GNS是集群的组件，它知道VIP的动态分配情况，因此可以正确的解析域名。

转载于:https://my.oschina.net/huayd/blog/127118