"No such file or directory" when "Inspecting identity-service relations for CA SSL certificate."

[Jason Hobbs]

my ceilometer/2 unit failed during the install hook with this error:
http://paste.ubuntu.com/p/DdpJhrxMhg/

bundle and overlays:
http://paste.ubuntu.com/p/WHTgN7q6cq/

crashdump attached

[Chris Gregan (cgregan)]

reproduced again in CI

[David Ames (thedac)]

The charm is executing the ApacheSSLContext when the queens version of the charm does not install apache2. It fails on a2ensite, which does not exist.

Determining how ApacheSSLContext is getting rendered.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/566758

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/566758
Committed: https://git.openstack.org/cgit/openstack/charm-ceilometer/commit/?id=7589f3c2602f1fc8230e357105940e452920d975
Submitter: Zuul
Branch: master

commit 7589f3c2602f1fc8230e357105940e452920d975
Author: David Ames <email address hidden>
Date: Mon May 7 16:38:01 2018 -0700

    Do not assume OS release

    The ceilometer charm was assuming grizzly before the ceilometer-common
    package was installed to determine the OS release. On queens deploys
    this breaks due packages not being installed.

    If ceilomter-common is not installed return empty configs.

    Change-Id: Ib8bc1b7be3595bd8e64a25d0444dd768b80de881
    Closes-Bug: #1759301