Issue with Installation of Ceilometer for openstack Victoria. Error states: 504 gateway timeout

[Shamika Joshi]

This bug tracker is for errors with the documentation, use the following as a template and remove or add fields as you see fit. Convert [ ] into [x] to check boxes:

- [x] This doc is inaccurate in this way:
 The installation of python-gnocchiclient on Ubuntu (LTS 20.04) gives error(Unable to locate). Had to work with python3-gnocchiclient.
Also, 'service gnocchi-api restart' doesn't work
Followed instructions on: https://docs.openstack.org/ceilometer/victoria/install/install-base-ubuntu.html

- [x] This is a doc addition request:
I am following exact steps for Openstack Victoria installation as per the guide. I am getting '504 gateway timeout' error when I did 'ceilometer-upgrade' step. I also tried to run 'gnocchi resource list' and got the same error.
I am unsure the issue is with Ceilometer or Gnocchi. Request you to provide the updated steps or work around for this issue.

- [ ] I have a fix to the document that I can paste below including example: input and output.

If you have a troubleshooting or support issue, use the following resources:

 - The mailing list: https://lists.openstack.org
 - IRC: 'openstack' channel on OFTC

-----------------------------------
Release: 15.0.1.dev9 on 2018-05-15 14:59:48
SHA: e33a1f7dd6386bc3cbb45c41c3f0a74e03b5f1f5
Source: https://opendev.org/openstack/ceilometer/src/doc/source/install/index.rst
URL: https://docs.openstack.org/ceilometer/victoria/install/

[Han Guangyu (han-guangyu)]

The error of 'ceilometer-upgrade' step may be caused by the failed of 'service gnocchi-api start'.
I have encountered similar error, the gnocchi-api.service always failed after a few senconds of successful startup.

And the reason which was found by me is about the version of Python. The version of Python in os is "python3", and the gnocchi used "python". I had submitted a patch to Gnocchi in Github.
The patch is: https://github.com/gnocchixyz/gnocchi/pull/1171

Maybe you can follow this patch to try.