Bug 2216295

Summary:	[cee/sd][cephadm] got a message "host.containers.internal’s server IP address could not be found" while accessing Grafana graphs on the ceph-dashboard
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Milind <milverma>
Component:	Cephadm	Assignee:	Adam King <adking>
Status:	CLOSED ERRATA	QA Contact:	Vinayak Papnoi <vpapnoi>
Severity:	medium	Docs Contact:	Akash Raj <akraj>
Priority:	unspecified
Version:	6.0	CC:	adking, akraj, ceph-eng-bugs, cephqe-warriors, saraut, tserlin
Target Milestone:	---
Target Release:	6.1z1
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	ceph-17.2.6-84.el9cp	Doc Type:	Bug Fix
Doc Text:	.Special lines are no longer included in the host's `/etc/hosts` file when mounting into the container Previously, podman versions added a special line to the `/etc/hosts` file inside the container which messed with the host name resolution within the container, causing it to think that the FQDN of the current host is _host.containers.internal_. With this fix, the host's `/etc/hosts` file is mounted into the container without the special lines and users can use `/etc/hosts` for hostname resolution. Users will no longer encounter errors related to being unable to find the IP for _host.container.internal_ while accessing Grafana graphs in the Ceph dashboard.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2023-08-03 16:45:10 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	2221020

Description Milind 2023-06-20 18:53:44 UTC

Created attachment 1971757 [details]
error screenshot

Description of problem:
I have a fresh RHCS 6 cluster. When I try to access any of the grafana dashboards via Ceph Dashboard, I get an "host.containers.internal’s server IP address could not be found" error.

See attachment (Error screenshot)

Version-Release number of selected component (if applicable):
ceph version 17.2.5-75.el9cp (52c8ab07f1bc5423199eeb6ab5714bc30a930955) 

How reproducible:
Always

Steps to Reproduce:
1. Install a RHCS 6 cluster
2. Open the ceph dashboard
3. Try to open any graph provided by grafana

Actual results:
the iframe shows "host.containers.internal not found"

Expected results:
The graphs shoudl be present

Additional info:

Upon searching more I see that each of the podman container has this entry mentioned in their /etc/hosts where the container is running and the name host.containers.internal. In the upstream tracker [1] it is mentioned that this issue in only with podman version 4.1
------
[root@mgmt-0 ~]# podman exec -it ceph-38f5dc9a-0885-11ee-9a72-fa163efb4790-mon-mgmt-0-milvermarhcs5-lab-upshift-rdu2-redhat-com   cat /etc/hosts
127.0.0.1	localhost localhost.localdomain localhost4 localhost4.localdomain4
::1	localhost localhost.localdomain localhost6 localhost6.localdomain6
10.0.90.20	host.containers.internal   <<<<<<<
------

Podman version:
[root@mgmt-0 38f5dc9a-0885-11ee-9a72-fa163efb4790]# podman version
Client:       Podman Engine
Version:      4.4.1
API Version:  4.4.1
Go Version:   go1.19.6
Built:        Wed Apr 26 12:50:28 2023
OS/Arch:      linux/amd64

Able to resolve by manually updating the API host.
------
ceph dashboard set-alertmanager-api-host http://...
ceph dashboard set-grafana-api-url https://...
ceph dashboard set-prometheus-api-host http://...
------

[1] https://tracker.ceph.com/issues/57018

Need to know the root cause of this issue and is the above workaround is legitimate?

Comment 20 errata-xmlrpc 2023-08-03 16:45:10 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Red Hat Ceph Storage 6.1 Bug Fix update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2023:4473