Hi - I have seen a lot of similar answers but none that completely convinces me that what I'm doing is right.
I have a master account for mydomain.com.
Within mydomain.com i have created a number of subdomains for testing purposes and are stored in directories within the root directory for the website. For example, mydomain.com/sub1 and mydomain.com/sub2 are also mapped to subdomains sub1.mydomain.com and sub2.mydomain.com.
Some of these are also mapped to add-on domains like sub3.com and sub4.com. These are very small-scale, low budget websites that are mainly blogs/personal/very small business sites I host for friends, not commercial accounts, so they really can't justify the expense or effort of creating and maintaining their own separate hosting accounts.
I recently discovered that sub3.mydomain.com and sub4.mydomain.com are being indexed by Google (even though it is NOT linked to anywhere as it is a test site under development). We are using Google Wave for discussion of sub4, so it is possible they could have used that semi-private info (disturbing, but another story). Not sure how they would know about sub3.
In the root directory for the website, I added robots.txt (oops, was sloppy before and didn't create it for subs1-20). This includes the lines:
Will this effectively prevent mydomain.com/subX and subX.mydomain.com from being indexed while still allowing sub3.com and sub4.com to be indexed (and controlled using additional robots.txt in their root directories)?
Is there anything else I should do? Thanks!