Hugo Robots Meta Tag
Brian
When I first moved over to Hugo, I struggled to get the robots meta tag working. Note that I am using the Ananke theme and this may be different for other themes.
Primer
Honestly, I have not spent a lot of time in my career on SEO and did not have a deep understanding of how the robots meta-tag and robots.txt file work. Here is a quick primer. First, a page can include a meta-tag in the header that specifies that a page should be indexed by search engines or not. In addition, you can specify that search engines should or should not follow links on that page. For example, the following says that search engines should both index the page and follow links.
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Alternatively, this example says that search engines should neither index the page nor follow links.
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It can be tedious to set this at the page level, so there is also a file robots.txt in the root of the site that can be used to mark specific paths that should not be indexed. For example, the following robots.txt file says that search engines should not index the entire site.
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Hugo
Returning to Hugo, I mistakenly assumed that a production build would be configured to allow indexing, but that is not the case. When I first published my site with Hugo, it rendered it with NOINDEX and NOFOLLOW
According to the Hugo Documentation:
Default environments are development with hugo serve and production with hugo.
So it would make sense that a production build rendered with INDEX and FOLLOW, but that is not the case. Digging into code, the Ananke theme is checking for the HUGO_ENV environment variable regardless of the command-line options. If HUGO_ENV==“production” then it will set the meta-tag to INDEX, otherwise it will set the meta-tag to NOINDEX.
So I had to update the build to set the environment variable before calling hugo. For example:
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