Dashboard, Object Gateway, RGW REST API cannot be reached.

This document (000019794) is provided subject to the disclaimer at the end of this document.

Environment

SUSE Enterprise Storage 6

Situation

Customer need to manage SES Dashboard/Object Gateway. But gets message "RGW REST API cannot be reached"

Resolution

The SES Dashboard gets the RGW information automatically.

To enable the auto-detection you need to make sure that the RGW_API_PORT is 80, RGW_API_HOST must be an empty string and RGW_API_SCHEME must be 'http'. If you modify one of them, then the auto-detection is disabled and the default values or any configured values are used.

In this case this should be "rgw01" with the address "192.168.100.104:0/2725645911"

The auto-detection uses the first found entry of the output from 'ceph report' which is located at 'servicemap.services.rgw.daemons'.

Example:
# ceph report | jq '.servicemap'
report 1324590349
{
"epoch": 23,
"modified": "2020-11-23 15:19:25.392596",
"services": {
"mds": {
"daemons": {
"summary": "",
"rgw01": {
"start_epoch": 0,
"start_stamp": "0.000000",
"gid": 0,
"addr": ":/0",
"metadata": {},
"task_status": {
"scrub status": "idle"
}
}
}
},
"rgw": {
"daemons": {
"summary": "",
"rgw01": {
"start_epoch": 18,
"start_stamp": "2020-11-23 09:42:09.721718",
"gid": 1924449,
"addr": "192.168.100.104:0/2725645911",
"metadata": {
"arch": "x86_64",
"ceph_release": "nautilus",
"ceph_version": "ceph version 14.2.13-450-g65ea1b614d (65ea1b614db8b6d10f334a8ff67c4de97f73bcbf) nautilus (stable)",
"ceph_version_short": "14.2.13-450-g65ea1b614d",
"cpu": "Intel Xeon E312xx (Sandy Bridge, IBRS update)",
"distro": "sles",
"distro_description": "SUSE Linux Enterprise Server 15 SP1",
"distro_version": "15.1",
"frontend_config#0": "beast port=80",
"frontend_type#0": "beast",
"hostname": "rgw01",
"kernel_description": "#1 SMP Fri Sep 4 14:58:39 UTC 2020 (f8eb45a)",
"kernel_version": "4.12.14-197.56-default",
"mem_swap_kb": "1048572",
"mem_total_kb": "1855368",
"num_handles": "1",
"os": "Linux",
"pid": "328172",
"zone_id": "b510603a-182e-4b9c-aaea-554a9fcf8d69",
"zone_name": "default",
"zonegroup_id": "f25b88ac-790b-4921-be78-4a7b261e5ec6",
"zonegroup_name": "default"
},
"task_status": {}
---[cut here]---

Using this address (auto-detected or manually configured) you should be able to connect the Dashboard with the RGW.

Configre SES Dashboard for auto detection method:
Record current values:
# ceph dashboard get-rgw-api-port
# ceph dashboard get-rgw-api-host
# ceph dashboard get-rgw-api-scheme

Now change the following parameters, if nessesary:
# ceph dashboard set-rgw-api-port 80
# ceph dashboard set-rgw-api-host ""
# ceph dashboard set-rgw-api-scheme http

Validate configuraiton changed:
# ceph dashboard get-rgw-api-port
# ceph dashboard get-rgw-api-host
# ceph dashboard get-rgw-api-scheme

May need to disable/enable SES dashboard:
# ceph mgr module disable dashboard
# ceph mgr module enable dashboard

In a browser, new tab, goto the SES dashboard/Object Gateway.
See if messages is no longer displayed.

Cause

SES Dashboard is not configured correctly to communicate with the rgw's to display requested information.

Status

Top Issue

Disclaimer

This Support Knowledgebase provides a valuable tool for SUSE customers and parties interested in our products and solutions to acquire information, ideas and learn from one another. Materials are provided for informational, personal or non-commercial use within your organization and are presented "AS IS" WITHOUT WARRANTY OF ANY KIND.