Using Blogger with a custom domain: the zonefile dot problem

A quick note to myself the next time I stumble over this: when you instruct Blogger to map the blog to a 3rd party (custom) domain it basically instructs you to add three entries to your domain’s zone file:

1. a mapping from the domain to
2. a mapping from some weird subdomain you’ll be given to another wreird subdomain at google. Apparently this is some load balancing measure
3. A TXT verification record

Now, these google domains you’ll be given are qualified (“absolute”) domains and always end with a dot. If your domain is and you remove the dot:

blog                3600 IN CNAME

(Note that does not end with a dot)

Here “blog” will map to

The correct zonefile entry is

blog                3600 IN CNAME

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