Block an entire subdomain with robots.txt?
-
Is it possible to block an entire subdomain with robots.txt?
I write for a blog that has their root domain as well as a subdomain pointing to the exact same IP. Getting rid of the option is not an option so I'd like to explore other options to avoid duplicate content. Any ideas?
-
Awesome! That did the trick -- thanks for your help. The site is no longer listed
-
Fact is, the robots file alone will never work (the link has a good explanation why - short form: all it does is stop the bots from indexing again).
Best to request removal then wait a few days.
-
Yeah. As of yet, the site has not been de-indexed. We placed the conditional rule in htaccess and are getting different robots.txt files for the domain and subdomain -- so that works. But I've never done this before so I don't know how long it's supposed to take?
I'll try to verify via Webmaster Tools to speed up the process. Thanks
-
You should do a remove request in Google Webmaster Tools. You have to first verify the sub-domain then request the removal.
See this post on why the robots file alone won't work...
http://www.seomoz.org/blog/robot-access-indexation-restriction-techniques-avoiding-conflicts
-
Awesome. We used your second idea and so far it looks like it is working exactly how we want. Thanks for the idea.
Will report back to confirm that the subdomain has been de-indexed.
-
Option 1 could come with a small performance hit if you have a lot of txt files being used on the server.
There shouldn't be any negative side effects to option 2 if the rewrite is clean (IE not accidently a redirect) and the content of the two files are robots compliant.
Good luck
-
Thanks for the suggestion. I'll definitely have to do a bit more research into this one to make sure that it doesn't have any negative side effects before implementation
-
We have a plugin right now that places canonical tags, but unfortunately, the canonical for the subdomain points to the subdomain. I'll look around to see if I can tweak the settings
-
Sounds like (from other discussions) you may be stuck requiring a dynamic robot.txt file which detects what domain the bot is on and changes the content accordingly. This means the server has to run all .txt file as (I presume) PHP.
Or, you could conditionally rewrite the /robot.txt URL to a new file according to sub-domain
RewriteEngine on
RewriteCond %{HTTP_HOST} ^subdomain.website.com$
RewriteRule ^robotx.txt$ robots-subdomain.txtThen add:
User-agent: *
Disallow: /to the robots-subdomain.txt file
(untested)
-
Placing canonical tags isn't an option? Detect that the page is being viewed through the subdomain, and if so, write the canonical tag on the page back to the root domain?
Or, just place a canonical tag on every page pointing back to the root domain (so the subdomain and root domain pages would both have them). Apparently, it's ok to have a canonical tag on a page pointing to itself. I haven't tried this, but if Matt Cutts says it's ok...
-
Hey Ryan,
I wasn't directly involved with the decision to create the subdomain, but I'm told that it is necessary to create in order to bypass certain elements that were affecting the root domain.
Nevertheless, it is a blog and the users now need to login to the subdomain in order to access the Wordpress backend to bypass those elements. Traffic for the site still goes to the root domain.
-
They both point to the same location on the server? So there's not a different folder for the subdomain?
If that's the case then I suggest adding a rule to your htaccess file to 301 the subdomain back to the main domain in exactly the same way people redirect from non-www to www or vice-versa. However, you should ask why the server is configured to have a duplicate subdomain? You might just edit your apache settings to get rid of that subdomain (usually done through a cpanel interface).
Here is what your htaccess might look like:
<ifmodule mod_rewrite.c="">RewriteEngine on
# Redirect non-www to wwww
RewriteCond %{HTTP_HOST} !^www.mydomain.org [NC]
RewriteRule ^(.*)$ http://www.mydomain.org/$1 [R=301,L]</ifmodule> -
Not to me LOL
I think you'll need someone with a bit more expertise in this area than I to assist in this case. Kyle, I'm sorry I couldn't offer more assistance... but I don't want to tell you something if I'm not 100% sure. I suspect one of the many bright SEOmozer's will quickly come to the rescue on this one.
Andy
-
Hey Andy,
Herein lies the problem. Since the domain and subdomain point to the exact same place, they both utilize the same robots.txt file.
Does that make sense?
-
Hi Kyle
Yes, you can block an entire subdomain via robots.txt, however you'll need to create a robots.txt file and place it in the root of the subdomain, then add the code to direct the bots to stay away from the entire subdomain's content.
User-agent: *
Disallow: /hope this helps
Got a burning SEO question?
Subscribe to Moz Pro to gain full access to Q&A, answer questions, and ask your own.
Browse Questions
Explore more categories
-
Moz Tools
Chat with the community about the Moz tools.
-
SEO Tactics
Discuss the SEO process with fellow marketers
-
Community
Discuss industry events, jobs, and news!
-
Digital Marketing
Chat about tactics outside of SEO
-
Research & Trends
Dive into research and trends in the search industry.
-
Support
Connect on product support and feature requests.
Related Questions
-
Should I exclude my knowledge center subdomain from indexing?
We have a very large Knowledge center that is indexed. Is there any reason I should not exclude this subdomain from indexing? Thank you
Intermediate & Advanced SEO | | NikCall2 -
Does a root domain get SEO power from its subdomains?
Hi there! I'd appreciate your help with the following case: a) Current 10-year-old website (community) on root domain "example.com" (250,000 incoming quality-backlinks) will move to the new subdomain "newsub.example.com" (301 redirects to the new subdomain for all current subfolders) b) A new website (shop) will launch on the root domain "example.com" Question: Will the new website on "example.com" get SEO power from the old website on "newsub.example.com"? SEO power = linkjuice/authority/trust/history/etc. from the 250,000 backlinks. What I'm trying to achieve: Maintain the built-up SEO power for the root domain "example.com" Thanks for sharing your thoughts on this! P.S. Plenty has been written about subdomains inheriting from their root domains (so please don't share input on the subdomain vs. subfolder debate). But I can't find satisfactory info about the other way around (root domains inheriting from their subdomains), e.g. if wikia.com gets SEO power from its subdomains superman.wikia.com, starwars.wikia.com, etc.)
Intermediate & Advanced SEO | | ebebeb0 -
How Can A SubDomain Out Perform A Root Domain?
Hi guys! I have a rather strange SEO question. It may not be that strange at all actually. If a site has a subdomain or a shopping cart that is on a subdomain through a third-party shopping cart provider, can the third party shopping cart transfer value to the subdomain causing the subdomain to have greater domain authority than the main site or root domain? Another question, this subdomain, up until yesterday, blocked google from crawling it with robots txt, however it has a much higher domain authority than the root domain. The root domain has a really low domain authority, despite not blocking google from crawling it. How is this possible? I hope these questions make sense. I am a little stumped & trying to figure out why the subdomain is out-performing the main site despite being hidden from search, if that's even the case. Please let me know if I have it all wrong..
Intermediate & Advanced SEO | | Prae0 -
Is robots met tag a more reliable than robots.txt at preventing indexing by Google?
What's your experience of using robots meta tag v robots.txt when it comes to a stand alone solution to prevent Google indexing? I am pretty sure robots meta tag is more reliable - going on own experiences, I have never experience any probs with robots meta tags but plenty with robots.txt as a stand alone solution. Thanks in advance, Luke
Intermediate & Advanced SEO | | McTaggart1 -
Complimentary sub-brand; subdomain, subfolder, something else?
Hello forum! I have a question about subdomains vs. subfolders for a new sub-brand for a company. The company is looking at creating a sub-brand delivering a different service to the parent company. It is complimentary in a sense, but it would need a very different marketing strategy. It is not trying to 'hide' its parent brand at all, but instead would leverage the parent brand as added social proof. I've read that creating a subdomain essentially means starting from scratch in terms of SEO, and that a subfolder would better leverage the domain authority the TLD has accrued. However, creating a subfolder does not really gel with me, as it would not in my opinion provide a good experience for visitors. I.e. it's like running a website that sells electronics and having a subfolder marketing IT support services. Yes, there is some synergy-- but it can also lead to visitor confusion. I'd love your opinions on this! Carlo
Intermediate & Advanced SEO | | carlod0 -
Rel canonical and duplicate subdomains
Hi, I'm working with a site that has multiple sub domains of entirely duplicate content. So, the production level site that visitors see is (for made-up illustrative example): 123abc456.edu Then, there are sub domains which are used by different developers to work on their own changes to the production site, before those changes are pushed to production: Larry.123abc456.edu Moe.123abc456.edu Curly.123abc456.edu Google ends up indexing these duplicate sub domains, which is of course not good. If we add a canonical tag to the head section of the production page (and therefor all of the duplicate sub domains) will that cause some kind of problem... having a canonical tag on a page pointing to itself? Is it okay to have a canonical tag on a page pointing to that same page? To complete the example... In this example, where our production page is 123abc456.edu, our canonical tag on all pages (this page and therefor the duplicate subdomains) would be: Is that going to be okay and fix this without causing some new problem of a canonical tag pointing to the page it's on? Thanks!
Intermediate & Advanced SEO | | 945010 -
Robots.txt unblock
I'm currently having trouble with what appears to be a cached version of robots.txt. I'm being told via errors in my Google sitemap account that I'm denying Googlebot access to the entire site. I uploaded clean and "Allow" robots.txt yesterday, but receive the same error. I've tried "Fetch as Googlebot" on the index and other pages, but still the error. Here is the latest: | Denied by robots.txt |
Intermediate & Advanced SEO | | Elchanan
| 11/9/11 10:56 AM | As I said, there in not blocking on the robots.txt for 24 hours. HELP!0 -
Blocking Dynamic URLs with Robots.txt
Background: My e-commerce site uses a lot of layered navigation and sorting links. While this is great for users, it ends up in a lot of URL variations of the same page being crawled by Google. For example, a standard category page: www.mysite.com/widgets.html ...which uses a "Price" layered navigation sidebar to filter products based on price also produces the following URLs which link to the same page: http://www.mysite.com/widgets.html?price=1%2C250 http://www.mysite.com/widgets.html?price=2%2C250 http://www.mysite.com/widgets.html?price=3%2C250 As there are literally thousands of these URL variations being indexed, so I'd like to use Robots.txt to disallow these variations. Question: Is this a wise thing to do? Or does Google take into account layered navigation links by default, and I don't need to worry. To implement, I was going to do the following in Robots.txt: User-agent: * Disallow: /*? Disallow: /*= ....which would prevent any dynamic URL with a '?" or '=' from being indexed. Is there a better way to do this, or is this a good solution? Thank you!
Intermediate & Advanced SEO | | AndrewY1