83ced7f6e6
Make inventory/service for service-specific things, including the groups.yaml group definitions, and inventory/base for hostvars related to the base system, including the list of hosts. Move the exisitng host_vars into inventory/service, since most of them are likely service-specific. Move group_vars/all.yaml into base/group_vars as almost all of it is related to base things, with the execption of the gerrit public key. A followup patch will move host-specific values into equivilent files in inventory/base. This should let us override hostvars in gate jobs. It should also allow us to do better file matchers - and to be able to organize our playbooks move if we want to. Depends-On: https://review.opendev.org/731583 Change-Id: Iddf57b5be47c2e9de16b83a1bc83bee25db995cf
154 lines
5.5 KiB
ReStructuredText
154 lines
5.5 KiB
ReStructuredText
:title: letsencrypt
|
|
|
|
.. _letsencrypt:
|
|
|
|
Let's Encrypt Certificates
|
|
##########################
|
|
|
|
We support provisioning certificates from https://letsencrypt.org for
|
|
hosts in the ``opendev.org`` namespace.
|
|
|
|
At a Glance
|
|
===========
|
|
|
|
:Ansible:
|
|
* :git_file:`playbooks/letsencrypt.yaml`
|
|
* :git_file:`playbooks/roles/letsencrypt-acme-sh-install`
|
|
* :git_file:`playbooks/roles/letsencrypt-request-certs`
|
|
* :git_file:`playbooks/roles/letsencrypt-install-txt-record`
|
|
* :git_file:`playbooks/roles/letsecnrypt-create-certs`
|
|
:Resources:
|
|
* https://letsencrypt.org
|
|
* https://github.com/Neilpang/acme.sh
|
|
:Chat:
|
|
* #opendev on freenode
|
|
|
|
Overview
|
|
========
|
|
|
|
We support automatic provisioning of certificates from Let's Encrypt
|
|
to hosts in the ``opendev.org`` domain.
|
|
|
|
This is implemented in OpenDev via the roles driven from
|
|
:git_file:`playbooks/letsencrypt.yaml`. The overall
|
|
actions implemented by the above roles are roughly:
|
|
|
|
* Hosts that want a certificate use the ``amce.sh`` tool to request it
|
|
from the Let's Encrypt CA.
|
|
|
|
Creation or renewal requests receive a TXT record authentication
|
|
value that must be published to prove ownership of the domain. We
|
|
implement this by making the challenge-request hostname
|
|
``_acme-challenge.hostname.opendev.org`` a ``CNAME`` record to a
|
|
special "signing domain" ``acme.opendev.org``.
|
|
|
|
Note if valid certificates are present and they are not within the
|
|
renewal period (which is most of the time) no further action is
|
|
taken.
|
|
|
|
* The provided TXT record authentication values are installed and
|
|
published to the ``acme.opendev.org`` domain via the OpenDev
|
|
nameservers.
|
|
|
|
* The host can now finalise certificate creation. Let's Encrypt
|
|
checks ``_acme-chellenge.hostname.opendev.org``, which is a
|
|
``CNAME`` to ``acme.opendev.org``. Let's Encrypt then enumerates
|
|
the TXT records there, and once finding the required key will return
|
|
the signed keys to the host, which saves them to disk.
|
|
|
|
|
|
Configuring a host to get certificates
|
|
======================================
|
|
|
|
A basic configuration consists of the following steps:
|
|
|
|
1. Ensure the host is matched by the ``letsencrypt`` group in
|
|
:git_file:`inventory/groups.yaml`.
|
|
#. DNS entries for ``_acme-chellenge.hostname`` as a ``CNAME`` to
|
|
``opendev.org`` must be added and live in the ``opendev.org``
|
|
`zone.db
|
|
<https://opendev.org/opendev/zone-opendev.org/src/branch/master/zones/opendev.org/zone.db>`__
|
|
file. Follow the other examples to ensure other fields such as
|
|
``CAA`` records are set too.
|
|
|
|
Take care to list `all` hostnames that you wish covered by the
|
|
certificate (e.g. ``hostname01.opendev.org`` and
|
|
``hostname.opendev.org``)
|
|
#. Configure the certificates to be issued to the host.
|
|
|
|
The roles look for certificate configuration in a
|
|
``letsencrypt_certs`` variable defined for each host. This is
|
|
usually done via specific host variables in
|
|
``inventory/service/host_vars/<hostname>.opendev.org.yaml``. For a simple
|
|
host that wants a single certificate to cover its numeric hostname
|
|
and regular ``CNAME`` this would look like ::
|
|
|
|
letsencrypt_certs:
|
|
hostname01-opendev-org:
|
|
- hostname01.opendev.org
|
|
- hostname.opendev.org
|
|
|
|
This will result in certificate material in
|
|
``/etc/letsencrypt-certs/hostname01.opendev.org/`` on the host.
|
|
|
|
Note that the "certificate name" dictionary keys (just
|
|
``hostname01-opendev-org`` above) are essentially a free-form
|
|
string, but are used in the next step. Follow the naming
|
|
conventions for similar hosts.
|
|
|
|
For full details, including information on issuing multiple
|
|
certificates for a single host, see
|
|
:git_file:`playbooks/roles/letsencrypt-request-certs/README.rst`.
|
|
#. Define a handler for certificate creation and renewal actions.
|
|
|
|
When the certificate is created or renewed, the
|
|
``letsencrypt-create-certs`` role calls a predefined handler so
|
|
action can be taken. This handler name is constructed by
|
|
prepending ``letsencrypt updated`` to the certificate name above.
|
|
Thus in this example it would be ::
|
|
|
|
- name: letsencrypt updated hostname01-opendev-org
|
|
...
|
|
|
|
Usually these handlers are defined centrally in
|
|
:git_file:`playbooks/roles/letsencrypt-create-certs/handlers/main.yaml`
|
|
and common tasks such as restarting Apache have pre-defined tasks
|
|
available for easy import.
|
|
|
|
You may choose to define the handler in another way, but it *must*
|
|
exist (Ansible does not have a way to say "call this handler only
|
|
if it exists", thus a missing handler will cause an Ansible error
|
|
at runtime).
|
|
|
|
Debugging
|
|
=========
|
|
|
|
The Ansible run logs on ``bridge.opendev.org`` should be consulted if
|
|
the certificate material is not being created as expected.
|
|
|
|
Hosts will log their ``acme.sh`` output to
|
|
``/var/log/acme.sh/acme.sh.log``
|
|
|
|
The `G Suite Toolbox Dig <https://toolbox.googleapps.com/apps/dig/>`__
|
|
tool can be useful for checking DNS entries from a remote location.
|
|
|
|
Refreshing keys
|
|
===============
|
|
|
|
In normal operation there should be no need to manually refresh keys
|
|
on hosts. However there have been situations (such as LetsEncrypt
|
|
revoking certificates made during a certain period due to bugs) which
|
|
may necessitate a manual renewal.
|
|
|
|
The best way to do this is to move the ``.conf`` files from
|
|
``/etc/letsencrypt-certs/<certname>`` on the affected host and allow
|
|
the next Ansible pulse to renew.
|
|
|
|
.. code-block:: console
|
|
|
|
# cd /etc/letsencrypt-certs/<name>
|
|
# rename 's/.conf/.conf.old/' *.conf
|
|
# tail -f /var/log/acme.sh/acme.sh.log
|
|
... watch and should be renewed on next pulse
|
|
# rm *.conf.old
|