As the owner of the OHS Oracle Home, in the ohs/bin subdirectory of that Oracle Home...
./httpd -version
As the owner of the OHS Oracle Home...
opmnctl status
In a web browser...
In my installation index.html.en is in this directory.../u01/app/ohs/product/10.1.0/Apache/Apache/htdocsTo start everything under OPMN control...
opmnctl startall
To start just the Oracle HTTP Server...
opmnctl startproc ias-component=HTTP_Server
opmnctl restartproc ias-component=HTTP_Server
To stop everything under OPMN control...
opmnctl stopall
To start just the Oracle HTTP Server...
opmnctl stopproc ias-component=HTTP_Server
The error log is defined by the ErrorLog variable in the httpd.conf file. E.g.
ErrorLog /u01/app/ohs/product/10.1.0/ohs/logs/error_log
Note that any error log files defined within a <VirtualHost> container will override this valueThe access log is defined by the CustomLog variable in the httpd.conf file. E.g.
CustomLog /u01/app/ohs/product/10.1.0/ohs/logs/access_log common
Note that any access log files defined within a <VirtualHost> container will override this value