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ceph/doc/cephadm/services/monitoring.rst
Redouane Kachach f556a48ea6
mgr/cephadm: setting version field to a 17.2.3 
Signed-off-by: Redouane Kachach <rkachach@redhat.com>
2022-08-10 15:46:10 +02:00

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.. _mgr-cephadm-monitoring:
Monitoring Services
===================
Ceph Dashboard uses `Prometheus <https://prometheus.io/>`_, `Grafana
<https://grafana.com/>`_, and related tools to store and visualize detailed
metrics on cluster utilization and performance. Ceph users have three options:
#. Have cephadm deploy and configure these services. This is the default
when bootstrapping a new cluster unless the ``--skip-monitoring-stack``
option is used.
#. Deploy and configure these services manually. This is recommended for users
with existing prometheus services in their environment (and in cases where
Ceph is running in Kubernetes with Rook).
#. Skip the monitoring stack completely. Some Ceph dashboard graphs will
not be available.
The monitoring stack consists of `Prometheus <https://prometheus.io/>`_,
Prometheus exporters (:ref:`mgr-prometheus`, `Node exporter
<https://prometheus.io/docs/guides/node-exporter/>`_), `Prometheus Alert
Manager <https://prometheus.io/docs/alerting/alertmanager/>`_ and `Grafana
<https://grafana.com/>`_.
.. note::
Prometheus' security model presumes that untrusted users have access to the
Prometheus HTTP endpoint and logs. Untrusted users have access to all the
(meta)data Prometheus collects that is contained in the database, plus a
variety of operational and debugging information.
However, Prometheus' HTTP API is limited to read-only operations.
Configurations can *not* be changed using the API and secrets are not
exposed. Moreover, Prometheus has some built-in measures to mitigate the
impact of denial of service attacks.
Please see `Prometheus' Security model
<https://prometheus.io/docs/operating/security/>` for more detailed
information.
Deploying monitoring with cephadm
---------------------------------
The default behavior of ``cephadm`` is to deploy a basic monitoring stack. It
is however possible that you have a Ceph cluster without a monitoring stack,
and you would like to add a monitoring stack to it. (Here are some ways that
you might have come to have a Ceph cluster without a monitoring stack: You
might have passed the ``--skip-monitoring stack`` option to ``cephadm`` during
the installation of the cluster, or you might have converted an existing
cluster (which had no monitoring stack) to cephadm management.)
To set up monitoring on a Ceph cluster that has no monitoring, follow the
steps below:
#. Deploy a node-exporter service on every node of the cluster. The node-exporter provides host-level metrics like CPU and memory utilization:
.. prompt:: bash #
ceph orch apply node-exporter
#. Deploy alertmanager:
.. prompt:: bash #
ceph orch apply alertmanager
#. Deploy Prometheus. A single Prometheus instance is sufficient, but
for high availability (HA) you might want to deploy two:
.. prompt:: bash #
ceph orch apply prometheus
or
.. prompt:: bash #
ceph orch apply prometheus --placement 'count:2'
#. Deploy grafana:
.. prompt:: bash #
ceph orch apply grafana
.. _cephadm-monitoring-centralized-logs:
Centralized Logging in Ceph
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Ceph now provides centralized logging with Loki & Promtail. Centralized Log Management (CLM) consolidates all log data and pushes it to a central repository,
with an accessible and easy-to-use interface. Centralized logging is designed to make your life easier.
Some of the advantages are:
#. **Linear event timeline**: it is easier to troubleshoot issues analyzing a single chain of events than thousands of different logs from a hundred nodes.
#. **Real-time live log monitoring**: it is impractical to follow logs from thousands of different sources.
#. **Flexible retention policies**: with per-daemon logs, log rotation is usually set to a short interval (1-2 weeks) to save disk usage.
#. **Increased security & backup**: logs can contain sensitive information and expose usage patterns. Additionally, centralized logging allows for HA, etc.
Centralized Logging in Ceph is implemented using two new services - ``loki`` & ``promtail``.
Loki: It is basically a log aggregation system and is used to query logs. It can be configured as a datasource in Grafana.
Promtail: It acts as an agent that gathers logs from the system and makes them available to Loki.
These two services are not deployed by default in a Ceph cluster. To enable the centralized logging you can follow the steps mentioned here :ref:`centralized-logging`.
.. _cephadm-monitoring-networks-ports:
Networks and Ports
~~~~~~~~~~~~~~~~~~
All monitoring services can have the network and port they bind to configured with a yaml service specification
example spec file:
.. code-block:: yaml
service_type: grafana
service_name: grafana
placement:
count: 1
networks:
- 192.169.142.0/24
spec:
port: 4200
Using custom images
~~~~~~~~~~~~~~~~~~~
It is possible to install or upgrade monitoring components based on other
images. To do so, the name of the image to be used needs to be stored in the
configuration first. The following configuration options are available.
- ``container_image_prometheus``
- ``container_image_grafana``
- ``container_image_alertmanager``
- ``container_image_node_exporter``
Custom images can be set with the ``ceph config`` command
.. code-block:: bash
ceph config set mgr mgr/cephadm/<option_name> <value>
For example
.. code-block:: bash
ceph config set mgr mgr/cephadm/container_image_prometheus prom/prometheus:v1.4.1
If there were already running monitoring stack daemon(s) of the type whose
image you've changed, you must redeploy the daemon(s) in order to have them
actually use the new image.
For example, if you had changed the prometheus image
.. prompt:: bash #
ceph orch redeploy prometheus
.. note::
By setting a custom image, the default value will be overridden (but not
overwritten). The default value changes when updates become available.
By setting a custom image, you will not be able to update the component
you have set the custom image for automatically. You will need to
manually update the configuration (image name and tag) to be able to
install updates.
If you choose to go with the recommendations instead, you can reset the
custom image you have set before. After that, the default value will be
used again. Use ``ceph config rm`` to reset the configuration option
.. code-block:: bash
ceph config rm mgr mgr/cephadm/<option_name>
For example
.. code-block:: bash
ceph config rm mgr mgr/cephadm/container_image_prometheus
.. _cephadm-overwrite-jinja2-templates:
Using custom configuration files
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
By overriding cephadm templates, it is possible to completely customize the
configuration files for monitoring services.
Internally, cephadm already uses `Jinja2
<https://jinja.palletsprojects.com/en/2.11.x/>`_ templates to generate the
configuration files for all monitoring components. Starting from version 17.2.3,
cephadm uses Prometheus http service discovery support `http_sd_config
<https://prometheus.io/docs/prometheus/2.28/configuration/configuration/#http_sd_config>`
in order to get the currently configured targets from Ceph. Internally, `ceph-mgr`
provides a service discovery endpoint at `<https://<mgr-ip>:8765/sd/` (port is
configurable through the variable `service_discovery_port`) which is used by
Prometheus to get the needed targets.
Customers with external monitoring stack can use `ceph-mgr` service discovery endpoint
to get scraping configuration. Root certificate of the server can be obtained by the
following command:
.. prompt:: bash #
ceph orch sd dump cert
The configuration of Prometheus, Grafana, or Alertmanager may be customized by storing
a Jinja2 template for each service. This template will be evaluated every time a service
of that kind is deployed or reconfigured. That way, the custom configuration is preserved
and automatically applied on future deployments of these services.
.. note::
The configuration of the custom template is also preserved when the default
configuration of cephadm changes. If the updated configuration is to be used,
the custom template needs to be migrated *manually* after each upgrade of Ceph.
Option names
""""""""""""
The following templates for files that will be generated by cephadm can be
overridden. These are the names to be used when storing with ``ceph config-key
set``:
- ``services/alertmanager/alertmanager.yml``
- ``services/grafana/ceph-dashboard.yml``
- ``services/grafana/grafana.ini``
- ``services/prometheus/prometheus.yml``
- ``services/loki.yml``
- ``services/promtail.yml``
You can look up the file templates that are currently used by cephadm in
``src/pybind/mgr/cephadm/templates``:
- ``services/alertmanager/alertmanager.yml.j2``
- ``services/grafana/ceph-dashboard.yml.j2``
- ``services/grafana/grafana.ini.j2``
- ``services/prometheus/prometheus.yml.j2``
- ``services/loki.yml.j2``
- ``services/promtail.yml.j2``
Usage
"""""
The following command applies a single line value:
.. code-block:: bash
ceph config-key set mgr/cephadm/<option_name> <value>
To set contents of files as template use the ``-i`` argument:
.. code-block:: bash
ceph config-key set mgr/cephadm/<option_name> -i $PWD/<filename>
.. note::
When using files as input to ``config-key`` an absolute path to the file must
be used.
Then the configuration file for the service needs to be recreated.
This is done using `reconfig`. For more details see the following example.
Example
"""""""
.. code-block:: bash
# set the contents of ./prometheus.yml.j2 as template
ceph config-key set mgr/cephadm/services/prometheus/prometheus.yml \
-i $PWD/prometheus.yml.j2
# reconfig the prometheus service
ceph orch reconfig prometheus
Deploying monitoring without cephadm
------------------------------------
If you have an existing prometheus monitoring infrastructure, or would like
to manage it yourself, you need to configure it to integrate with your Ceph
cluster.
* Enable the prometheus module in the ceph-mgr daemon
.. code-block:: bash
ceph mgr module enable prometheus
By default, ceph-mgr presents prometheus metrics on port 9283 on each host
running a ceph-mgr daemon. Configure prometheus to scrape these.
To make this integration easier, Ceph provides by means of `ceph-mgr` a service
discovery endpoint at `<https://<mgr-ip>:8765/sd/` which can be used by an external
Prometheus to retrieve targets information. Information reported by this EP used
the format specified by `http_sd_config
<https://prometheus.io/docs/prometheus/2.28/configuration/configuration/#http_sd_config>`
* To enable the dashboard's prometheus-based alerting, see :ref:`dashboard-alerting`.
* To enable dashboard integration with Grafana, see :ref:`dashboard-grafana`.
Disabling monitoring
--------------------
To disable monitoring and remove the software that supports it, run the following commands:
.. code-block:: console
$ ceph orch rm grafana
$ ceph orch rm prometheus --force # this will delete metrics data collected so far
$ ceph orch rm node-exporter
$ ceph orch rm alertmanager
$ ceph mgr module disable prometheus
See also :ref:`orch-rm`.
Setting up RBD-Image monitoring
-------------------------------
Due to performance reasons, monitoring of RBD images is disabled by default. For more information please see
:ref:`prometheus-rbd-io-statistics`. If disabled, the overview and details dashboards will stay empty in Grafana
and the metrics will not be visible in Prometheus.
Setting up Grafana
------------------
Manually setting the Grafana URL
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Cephadm automatically configures Prometheus, Grafana, and Alertmanager in
all cases except one.
In a some setups, the Dashboard user's browser might not be able to access the
Grafana URL that is configured in Ceph Dashboard. This can happen when the
cluster and the accessing user are in different DNS zones.
If this is the case, you can use a configuration option for Ceph Dashboard
to set the URL that the user's browser will use to access Grafana. This
value will never be altered by cephadm. To set this configuration option,
issue the following command:
.. prompt:: bash $
ceph dashboard set-grafana-frontend-api-url <grafana-server-api>
It might take a minute or two for services to be deployed. After the
services have been deployed, you should see something like this when you issue the command ``ceph orch ls``:
.. code-block:: console
$ ceph orch ls
NAME RUNNING REFRESHED IMAGE NAME IMAGE ID SPEC
alertmanager 1/1 6s ago docker.io/prom/alertmanager:latest 0881eb8f169f present
crash 2/2 6s ago docker.io/ceph/daemon-base:latest-master-devel mix present
grafana 1/1 0s ago docker.io/pcuzner/ceph-grafana-el8:latest f77afcf0bcf6 absent
node-exporter 2/2 6s ago docker.io/prom/node-exporter:latest e5a616e4b9cf present
prometheus 1/1 6s ago docker.io/prom/prometheus:latest e935122ab143 present
Configuring SSL/TLS for Grafana
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
``cephadm`` deploys Grafana using the certificate defined in the ceph
key/value store. If no certificate is specified, ``cephadm`` generates a
self-signed certificate during the deployment of the Grafana service.
A custom certificate can be configured using the following commands:
.. prompt:: bash #
ceph config-key set mgr/cephadm/grafana_key -i $PWD/key.pem
ceph config-key set mgr/cephadm/grafana_crt -i $PWD/certificate.pem
If you have already deployed Grafana, run ``reconfig`` on the service to
update its configuration:
.. prompt:: bash #
ceph orch reconfig grafana
The ``reconfig`` command also sets the proper URL for Ceph Dashboard.
Setting the initial admin password
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
By default, Grafana will not create an initial
admin user. In order to create the admin user, please create a file
``grafana.yaml`` with this content:
.. code-block:: yaml
service_type: grafana
spec:
initial_admin_password: mypassword
Then apply this specification:
.. code-block:: bash
ceph orch apply -i grafana.yaml
ceph orch redeploy grafana
Grafana will now create an admin user called ``admin`` with the
given password.
Setting up Alertmanager
-----------------------
Adding Alertmanager webhooks
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
To add new webhooks to the Alertmanager configuration, add additional
webhook urls like so:
.. code-block:: yaml
service_type: alertmanager
spec:
user_data:
default_webhook_urls:
- "https://foo"
- "https://bar"
Where ``default_webhook_urls`` is a list of additional URLs that are
added to the default receivers' ``<webhook_configs>`` configuration.
Run ``reconfig`` on the service to update its configuration:
.. prompt:: bash #
ceph orch reconfig alertmanager
Turn on Certificate Validation
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
If you are using certificates for alertmanager and want to make sure
these certs are verified, you should set the "secure" option to
true in your alertmanager spec (this defaults to false).
.. code-block:: yaml
service_type: alertmanager
spec:
secure: true
If you already had alertmanager daemons running before applying the spec
you must reconfigure them to update their configuration
.. prompt:: bash #
ceph orch reconfig alertmanager
Further Reading
---------------
* :ref:`mgr-prometheus`
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