Ceph - How to add hostnames in RGW zonegroup?

Environment

• Red Hat Ceph Storage 2.3
• Red Hat Ceph Storage 2.4
• Red Hat Ceph Storage 2.5
• Red Hat Ceph Storage 3
• Red Hat Ceph Storage 4
• Red Hat Ceph Storage 5

Issue

• How to add hostnames in RGW zonegroup?

Resolution

• Get the zonegroup

  # radosgw-admin zonegroup get --rgw-zonegroup=<zonegroup-name> > zonegroup.json

• Make a backup of the file so you can revert if needed:

# cp zonegroup.json zonegroup.bak.json

• Update the zonegroup.json file with new hostnames

   "hostnames": ["hostname-1", "hostname-2","hostname-N"],

• Set the zonegroup back in the RGW:

  # radosgw-admin zonegroup set --rgw-zonegroup=<zonegroup-name> --infile=zonegroup.json

• Update the period

 # radosgw-admin period update --commit

Diagnostic Steps

• Updated zonegroup with hostnames:

# radosgw-admin zonegroup get --rgw-zonegroup=default 
{
    "id": "26406af2-c69a-4659-99dc-84b5c34b58b1",
    "name": "default",
    "api_name": "",
    "is_master": "true",
    "endpoints": [],
    "hostnames": [
        "hostname-1",
        "hostname-2"
    ],
    "hostnames_s3website": [],
    "master_zone": "e27b7f16-10b2-48c9-8f84-feb35abbb0fd",
    "zones": [
        {
            "id": "e27b7f16-123b-48c9-8f84-feb35abbb0fd",
            "name": "default",
            "endpoints": [],
            "log_meta": "false",
            "log_data": "false",
            "bucket_index_max_shards": 0,
            "read_only": "false"
        }
    ],
    "placement_targets": [
        {
            "name": "default-placement",
            "tags": []
        }
    ],
    "default_placement": "default-placement",
    "realm_id": "516e9967-b978-42e3-be04-21ae1c72a622"
}

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