Carpet area vs Built up area vs Super builtup area

Carpet are:

It is the actual area under the roof. carpet area is the area calculated from wall to wall inside the house, this would include steps if any, inside the house.

Built up area:

 Built up area is the carpet area + area covered by thickness of walls+ balconies etc. As a general rule built up area is around 8% to 10% more than carpet area. 

Super builtup area 
Super built up area is a unique money making concept by builders in apartment complexes. This is built up area + (area occupied by common amenities like lifts, corridors, awnings, club house, stairs)/ number of appts. Rule of thumb - super built up is around 28 to 30% more than carpet area. However in some cases it can be upto 50% more.

Source : yahoo.com

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Permission denied: make_sock: could not bind to address

Permission denied: make_sock: could not bind to address

The other day when I was trying to bind httpd service (apache) on port 81,  I got an error saying "Permission denied: make_sock: could not bind to address" .

httpd: Could not reliably determine the server's fully qualified domain name, using 127.0.0.1 for ServerName

(13)Permission denied: make_sock: could not bind to address [::]:81

(13)Permission denied: make_sock: could not bind to address 0.0.0.0:81

no listening sockets available, shutting down

Unable to open logs

After a bit of debugging, found that the problem was with the policy that allows only favoured http ports.  

Use the semanage utility to find the ports.

1. semanage port -l | grep http 

http_port_t                    tcp      80, 443, 488, 8008, 8009, 8443

As you see , port 81 is not listed among the typical http ports

2. Add port 81 ( or any port of ur choice) to this list

semanage port -a -t http_port_t -p tcp 81.

3. Verify the port added

   

semanage port -l | grep http 

http_port_t                    tcp      81, 80, 443, 488, 8008, 8009, 8443

4. Restart httpd service. The service should start now!!

If you wish to remove a port from the favoured list , do as follows:

1. To remove port 81 ( added above) from the favoured http port list

semanage port -d -t http_port_t -p tcp 81

2. Verify whether the port is removed..

semanage port -l | grep http 

http_port_t                    tcp      80, 443, 488, 8008, 8009, 8443

Thats it!