Oracle RAC -- understanding of VIP

1、rac in vip There is no need for a separate network card , Will be bound to public NIC ;
2、 When a node fails ,vip Will drift to other nodes ;
3、 For each node Listener At the same time public NIC public IP and VIP Listen on two addresses ;

vip Virtual network protocol . When rac The node of 1 Something goes wrong , This node 1 Of vip1 Drift to another node in the cluster 2 On . Because at the node 2 There is no registered node on the listener of 1 Of vip1, So when a client tries to pass through a node 1 Of vip1 When you connect, you will immediately respond to receiving a rejected connection , At this time, the client will re initiate to vip2 Connection request .

Be careful ： When the connection rac When it cannot be used normally , Need to check public ip and vip Of 1521 Whether all ports are allowed to access