Re: Configure standby EBS 12.1.3 apps server to work with primary database in place

Posted by ErmanArslansOracleBlog on Dec 16, 2019; 1:50pm
URL: http://erman-arslan-s-oracle-forum.124.s1.nabble.com/Configure-standby-EBS-12-1-3-apps-server-to-work-with-primary-database-in-place-tp7921p7924.html

Okay..  I understand..

Actually , you should manage this by using a virtual host or something similar in your OS and/or DNS level..
if you want that kind of a customized HA environment, then you will follow a customized action plan.

So you want the apps tier of one of your secondary DR environment to connect to the primary database (in case of a disaster) So you think that your primary app tier will be down, but your primary db  tier will be up.
You dont want any extra configuration, you only want to start the apps services in the secondary env..
Then you need to have the same filesystem paths and the same hostname for the secondary apps tier env as the primary apps tier env.

Just copy the apps tier from primary to secondary. (using the same paths as the primary for the secondary)
Enable a virtual host in the secondary apps tier to be the same as the primary apps tier. Or use the same hostname for the secondary app host as the primary (but isolate the network, ensure no on
e is able to connect to secondary app accidentally) and manage it through DNS.. That's it.
With this configuration, you can just start the apps tier services without doing any configuration in the apps tier of the secondary env, and that apps tier services will connect to do the primary database.

Again, you should be very careful while implementing this. We don't want someone to try connecting the secondary normally.  Risk is yours.