For overview and various options for High Availability (at application tier
level) follow Metalink (Oracle My Support) note 380489.1 Using
Load-Balancers with Oracle E-Business Suite Release 12
Assumptions
Configuration steps mentioned are based on
following assumptions
1.E-Business Suite (Apps) is installed and accessible using at least
one apps server via web server port (assume port pool 0 i.e. 8000)
i.e. http://ebsapp01.domain.com:8000
2. There is hardware load balancer available with port translation (8000 to
80) – (Optional and required only if you want port
translation or URL on non default port)
Note: If your load balancer does not have port
translation feature and you would like to use standard HTTP(s) port i.e. 80 or
443 then additional steps are required to reconfigure EBS on 80/443
3. If you want URL to be SSL/HTTPS (port 443) then Load Balancer should have
capability to SSL
encryption/decryption (In this case SSL will terminate at Load
Balancer and from Load Balancer to Web/Apps Tier configure is HTTP)
Note: If you want SSL to be configured all the way
till Web/Apps Tier then additional steps are required to re-configure EBS on
443
4. EBS R12 supports multiple URLs pointing to same application. (For this setup you need minimum 2 apps tier + additional
profile option configuration)
Follow section 2.2 Using Hardware Load Balancer with Multiple Web Entry
Points of Note # 380489.1
5. Session
Persistence is configured at Load Balancer (Mandatory
if you have multiple middle/apps tier)
Configuration below are based on following setup
(change values where required)
1. There are two application tier (appserver1.localdomain.com and
appserver2.localdomain.com) with web port as 8000
2. Load Balancer URL after setup is mylbr.lbrdomain.com (listening on
port 80)
3. Load Balancer is configured with entry mylbr.lbrdomain.com:80
forwarding request to appserver1.localdomain.com:8000 &
appserver2.localdomain.com:8000 (with session stickiness)
.
Step to follow to re-configure Oracle Apps to use Load Balancer
1. Update following five values in Context File ($CONTEXT_FILE) (Context file is at $INST_TOP/appl/admin) of
application tier.
a) s_webentryhost – To load balancer URL i.e. mylbr (Do not enter full name with domain)
b) s_active_webport -to load balancer port i.e. 80 (For SSL
use 443)
c) s_login_page – Full URL pointing to Load
Balancer http://loadbalancer.domain:port/OA_HTML/AppsLogin i.e.
http://mylbr.lbrdomain.com:80/OA_HTML/AppsLogin (For
SSL use https and port as 443)
d) s_external_url – Load Balancer
URL http://loadbalancer.domain:port i.e.
http://mylbr.lbrdomain.com:80 (For SSL use https
and port as 443)
e) s_webentryurlprotocol – http (Change
to https if using SSL)
f) s_webentrydomain – Load Balancer Domain i.e. lbrdomain.com
2. Run Autoconfig on application tier
3. Repeat step 1 & 2 on all nodes running Web Server. (To check which
servers are running as Web Nodes, login to database as user apps and
run query “select node_name from fnd_nodes where SUPPORT_WEB=’Y’;”)
4. Test load balancer configuration by accessing load balancer URL i.e. http://mylbr.lbrdomain.com
5. If you get page not found error then check if request is coming from load
balancer to Web Server access logs at $LOG_HOME/ ora/10.1.3/
access_log.NNNNNNNN (sort access log based on time stamp “ls -ltr access_log*”)
Load Balancing configuration for R12:
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