What is the virtual IP in single instance DG handover?
This article will explain in detail what the virtual IP is like in the switching of single-instance DG. The content of the article is of high quality, so the editor will share it with you for reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.
When switching between DG master and slave, there are several methods to make the application connect to DG database normally without modifying the connection configuration.
First, the application connects to the host name, which can be adjusted by domain name resolution.
Second, the application connects the host to IP by setting VIP (manual configuration or cluster tools such as f5)
Third, the application connects the host to IP and modifies the host IP directly.
Make the DG master / slave switch transparent to the application by manually configuring VIP. The following is the configuration process:
1. Primary configure vip
Ifconfig eth2:0 192.168.206.95 netmask 255.255.255.128 # configure vip
Ifconfig eth2:0 down # Unconfigure
two。 Modify listener.ora
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP) (HOST = 192.168.206.95) (PORT = 1521))
(ADDRESS = (PROTOCOL = TCP) (HOST = 192.168.206.61) (PORT = 1521))
(ADDRESS = (PROTOCOL = IPC) (KEY = EXTPROC1521))
)
)
3. Restart monitoring
Lsnrctl stop
Lsnrctl start
4. Switchover (abbreviated)
After the switch, the role exchange between primary and standby is completed.
5. Manually configure vip
a. Cancel the vip of the original primary
Ifconfig eth2:0 down # Unconfigure
Lsnrctl stop 、 lsnrctl start
b. Original Standby configuration vip
Repeat steps 1-3. Handover complete
This is how to share the virtual IP in the switching of single instance DG. I hope the above content can be helpful to you and learn more knowledge. If you think the article is good, you can share it for more people to see.
