Swift proxy's cname lookup functionality (Middleware that translates an unknown domain in the host header to something that ends with the configured storage_domain by looking up the given domain’s CNAME record in DNS.) is not found in openstack manuals.
It has these configuration options:
Variable Service module Default
lookup_depth proxy_server filter:cname_lookup '1'
storage_domain proxy_server filter:cname_lookup 'example.com'
log_facility proxy_server filter:cname_lookup 'LOG_LOCAL0'
log_level proxy_server filter:cname_lookup 'INFO'
log_name proxy_server filter:cname_lookup 'cname_lookup'
log_headers proxy_server filter:cname_lookup 'f'
(more readable view at https://docs.google.com/spreadsheet/ccc?key=0ArysOOuLgF_PdFV0cFV2VkE2WkZUY1RNYjZBd204a0E )
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