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What are the OracleAS infrastructure components?

The OracleAS infrastructure components are grouped into two categories:
Identity Management components: it contains schemas for components such as Portal and Wireless.

OracleAS Metadata Repository components:

It is a consistent security model for all applications. It contains:

a) Oracle Internet Directory
b) OracleAS Delegated Administration Services
c) Oracle Directory Integration and Provisioning
d) OracleAS Certificate authority.

Oracle Application Server Topology

Client tier: PC, Cell phone, or PDA
Middle tier: HOST1- J2EE and WebCache, HOST2- Portal and wireless, HOST3- Portal and wireless, HOST4- BI Business Intelligence and forms, HOST5- etc.
Infrastructure: HOSTn- Single Sign On and OID, HOSTm- Metadata repository.

What is Oracle HTTP Server?

Oracle HTTP Server or OHS is an extension of the standard Apache distribution. It provides a robust and reliable Web server. You can access to FORMS, REPORTS, Discoverer, and Portal via the Web. You can access to Oracle stored procedures with a PL/SQL engine. It provides failover and supports J2EE (OC4J).

How to start and stop the HTTP Server manually:

The Oracle HTTP Server –OHS- is managed by the OPMN utility.

# cd $ORACLE_HOME/opmn/bin
# ./opmnctl startproc process-type=HTTP_Server -- starts the process
# ./opmnctl stopproc process-type=HTTP_Server -- stops the process
# ./opmnctl status – gives status information

List the name of all Oracle HTTP Server configuration files.

httpd.conf
mod_oc4j.conf
mime.types jsev.conf
oracle_appache.conf
aqxml.conf
moddav.conf
plsql.conf
ojsp.conf
xml.conf

How do you allow access from specific IP addresses or machine name?

Change your httpd.conf file to add the following lines:
<Location /server-status>
SetHandler server-status
Order deny,allow
Deny from all
Allow from xxx.xxx.xxx.xxx
</Location>

Configuring Directives and Virtual Hosts

What is directive?

Directives are files to use for configuring the server. For example, the web master of an Oracle HTTP Server contains more than 120 directives at his or her disposal for configuring the server. It contains container directives. The containers have opening and closing tag. Any directive that doesn’t appear within a container applies to the entire serve.

What is the <Directory> directive and how do you maintain it?

It is a group of directives that apply to the named directory and subdirectories.
Examples of how to maintain the <Directory> directive:
<Directory /> -- refers to the whole file system.
Options none
AllowOverride none
</Directory>
<Directory /home/myfiles/*> --refers to the myfiles subdirectory under home.
AllowOverride none
</Directory>
<DirectoryMatch “/u0[1-6]/”> --refers to directories that start with u0 and end with a number from 1 to 6
AllowOverride none
</Directory>

How to use IP-Based or Name-Based Virtual Hosts?

<VirtualHost 200.200.200.2 200.200.200.3>
DocumentRoot /usr/virtual/htdocs/home
ServerName learnoracle.bizhat.com <http://learnoracle.bizhat.com/>
ErrorLog /usr/virtual/logs/error_log
</VirtualHost>
<VirtualHost learnoracle.bizhat.com>
DocumentRoot /usr/virtual/htdocs/home
ServerName www.iselfschooling.com <http://www.iselfschooling.com/>
ErrorLog /usr/virtual/logs/error_log
</VirtualHost>