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DNS-Style Buckets with Multiple Domains

Problem​

The RGW supports two URL methods to specify the bucket name used for an operation:

  • Path-Style: https://s3.domain.com/bucketname/path/to/object
  • DNS-Style (aka Virtual Hosted-Style): https://bucketname.s3.domain.com/path/to/object

In order to support DNS-style buckets, the RGW is normally configured using:

# ceph config set rgw rgw_dns_name s3.domain.com
# ceph config set rgw rgw_dns_s3website_name s3-website.domain.com

But if a user wants to configure multiple domains for DNS-style buckets, an alternate configuration must be used.

Solution​

Set the hostname and hostname_s3_website fields in the zonegroup, for example:

# radosgw-admin zonegroup get | tee zonegroup.txt
{
    "id": "c294f981-1dc9-4af3-9a56-3a8ae0f44c89",
    "name": "default",
    "api_name": "default",
    "is_master": "true",
    "endpoints": [],
    "hostnames": [],
...
# vim zonegroup.txt # edit the hostnames field accordingly (see below).
# radosgw-admin zonegroup set < zonegroup.txt
# radosgw-admin zonegroup get
{
    "id": "c294f981-1dc9-4af3-9a56-3a8ae0f44c89",
    "name": "default",
    "api_name": "default",
    "is_master": "true",
    "endpoints": [],
    "hostnames": [
        "s3.domain1.com",
        "s3.domain2.com",
        "s3.domain3.com"
    ],
...
#

Finally, restart all RGW daemons:

# ceph orch ps
# ceph orch daemon restart <rgw>