Bug 1661817 - [DDF] Both the above commands report the correct hostname: undercloud-0. However, when later running the command 'openstack undercloud install' it fails with the following output: and it does not work until I run both hostnamectl commands listed below
Summary: [DDF] Both the above commands report the correct hostname: undercloud-0. Howe...
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat OpenStack
Classification: Red Hat
Component: documentation
Version: 13.0 (Queens)
Hardware: All
OS: All
unspecified
high
Target Milestone: ---
: ---
Assignee: Dan Macpherson
QA Contact: RHOS Documentation Team
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2018-12-23 15:38 UTC by Direct Docs Feedback
Modified: 2019-02-04 07:32 UTC (History)
2 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Director 13
Last Closed: 2019-02-04 07:32:11 UTC
Target Upstream Version:

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Description Direct Docs Feedback 2018-12-23 15:38:19 UTC 
Both the above commands report the correct hostname undercloud-0. However, when later running the command 'openstack undercloud install' it fails with the following output:
018-12-23 10:34:46,421 INFO: Logging to /home/stack/.instack/install-undercloud.log
2018-12-23 10:34:46,458 INFO: Checking for a FQDN hostname...
2018-12-23 10:34:46,493 INFO: Static hostname detected as localhost.localdomain
2018-12-23 10:34:46,511 INFO: Transient hostname detected as undercloud-0
2018-12-23 10:34:46,511 ERROR: Static hostname "localhost.localdomain" does not match transient hostname "undercloud-0".
2018-12-23 10:34:46,511 ERROR: Use hostnamectl to set matching hostnames.
2018-12-23 10:34:46,511 ERROR: An error occurred during configuration validation, please check your host configuration and try again. Error message: Static and transient hostnames do not match
Command 'instack-install-undercloud' returned non-zero exit status 1
and it does not work until I run both hostnamectl commands listed below

https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html/director_installation_and_usage/installing-the-undercloud#annotations:ff37cfc3-890d-475b-97a3-9cf68266a48a
Comment 1 Dan Macpherson 2019-01-31 04:02:51 UTC 
Hi Nadav,

I think this might be NOTABUG. The intro instructions state that you need to use a fully-qualified domain name that can be resolved with the DNS server you use for the undercloud node. 

In your case, you used "undercloud-0" as the hostname, which isn't a fully-qualified domain names (e.g. "undercloud-0.example.com")

I could modify the step text to say:

"If either of the previous commands do not report the correct fully-qualified hostname or report an error, use hostnamectl to set a hostname:"

What do you think?
Comment 2 Nadav Halevy 2019-02-03 01:20:40 UTC 
Hi Dan,

Thanks for explaining that. Now I understand.

I think that the modification you suggest would make it even clearer.

Many thanks,

Nadav
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