Parses log files and ships them to elasticsearch. Note we use the version shipped by Open Distro.
Visualisation tool that supports multiple different datasources. In our stack, we use it to visualise prometheus and elasticsearch data.
A search engine that provides full text search over a collection of JSON documents. In this project, the main use is for the archiving and retrieval of log files.
Stores metrics in a time series database and makes them available via the Prometheus Query Language (PromQL). Metrics are scraped from exporters. Exporters are services which expose HTTP endpoints that prometheus will periodically scrape to harvest new metrics.
Tool which parses slurm accounting data and produces a log file that is suitable for ingest by filebeat.
In this section we define any terms that may not be widely understood.
When referring to an "internal" role, we are referring to a role that is checked in to the appliance repository. These can be found in the following directory:
ansible/roles/<role_name>
Where role_name is the name of the internal role.
You should only customise the variables in environments/common if you are working on a feature that you intend to contribute back. Instead you should override the variables in the environment relevant to your deployment. This is possible since inventories later in the inheritance chain have greater precedence. Please see README.md for a more detailed explanation. This notice exists to avoid the need to need to keep repeating this point in the following sections. Where it is noted that you should customise a variable, it is implied that this change should be made to your own environment e.g environments/production in preference to environments/common, even when
this is not explicitly stated.
This section details the configuration of filebeat.
Filebeat is configured by the internal filebeat role which can be found here:
The appliance defaults for the filebeat role can be found at the following location:
Filebeat is configured to scrape the output of slurm stats. Slurm stats produces a json log file in the following location on the host:
/var/log/slurm-stats/finished_jobs.json
This is exposed to the filebeat container through a volume which mounts /var/log on the host to /logs in the container, where /logs is used to differentiate the host logs from the container logs.
Filebeat is configured to read this log file and post the data to elasticsearch via:
This file is configurable by the filebeat_config_path variable.
It is not currently possible to partially override filebeat.yml. You will have to configure filebeat_config_path to refer to another file, copying
the parts of the default configuration you want to keep. Pull requests are welcomed to add the functionality needed to allow for partial overrides.
The filebeat group controls the placement of the filebeat service. The default configuration scrapes the slurm_stats service output. This requires a filebeat instance to be co-located with the slurm_stats service.
In the simplest configuration, a single host should be assigned to the filebeat and slurm_stats group. The host assigned to the slurm_stats group should the same host as assigned to the filebeat group. More advanced configurations are possible, but require overriding filebeat_config_path using group or host variables.
This section details the configuration of grafana.
Internally, we use the cloudalchemy.grafana role. You can customise any of the variables that the role supports. For a full list, please see the upstream documentation. The appliance defaults can be found here:
The grafana group controls the placement of the grafana service. Load balancing is currently unsupported so it is important that you only assign one host to this group.
If Open Ondemand is enabled then by default this is used to proxy Grafana, otherwise Grafana is accessed through the first . See grafana_url in environments/common/inventory/group_vars/all/grafana.yml. The port used (variable grafana_port) defaults to 3000.
The default credentials for the admin user are:
username: grafana
password: <vault_grafana_admin_password>
Where vault_grafana_admin_password is a variable containing the actual password. This is generated by the generate-passwords.yml adhoc playbook (see README.md).
The appliance ships with a default set of dashboards. The set of dashboards can be configured via the grafana_dashboards variable. The dashboards are either internal to the grafana-dashboards role or downloaded from grafana.com.
This shows detailed metrics about an individual host. The metric source is node exporter (See prometheus section for more details). A slurm job annotation can optionally be enabled which will highlight the period of time where a given slurm job was running. The slurm job that is highlighted is controlled by the Slurm Job ID variable. An example is shown below:
This dashboard shows all of the slurm jobs that have run in a given time window. An example screenshot is show below:
Clicking on a row will link you to either the "openhpc" dashboard, or the "node exporter" dashboard. The "target dashboard" is controlled by the Dashboard URL drop-down menu. By navigating to these dashboards in this manner, slurm job annotations will be enabled. This will:
-
Highlight the slurm job, corresponding to the one you clicked, on the target dashboard.
-
It will also pass a regular expression matching nodes where the job was active. This causes the
Instancedrop down to only show those hosts. -
Narrow the time window so that the dashboard will only show the period of time where the job was active.
This is show below:
This dashboard is used visualise metrics from a group of hosts. The grouping is configured via the env label on the prometheus metrics (See prometheus section for more details). Grafana annotations are used to display the start and stop times of slurm jobs. An example screenshot is shown below:
The region highlighted in red shows the start and stop times of an example slurm job.
The default configuration configures the following datasources:
-
elasticsearch
Connects to the
opendistroservice that is deployed by this appliance. -
prometheus
Connects to the
prometheusservice that is deployed by this appliance.
This can be customised with the grafana_datasources variable.
This section details the configuration of OpenSearch.
The internal opensearch role is used to configure the service. The list of variables that can be customised can found in:
The appliance defaults are in the following file:
The opensearch group determines the placement of the OpenSearch service. Load balancing is currently unsupported so it is important that you only assign one host to this group.
By default, OpenSearch only listens on the loopback interface. It should therefore be placed on the same node as filebeat and grafana which need to access the OpenSearch API.
The default set of users is defined in:
This defines an the following accounts:
| username | password | purpose |
|---|---|---|
| admin | <vault_elasticsearch_admin_password> | User of highest privilege |
Where the password field refers to a variable containing the actual password. These are generated by the
generate-passwords.yml adhoc playbook (see README.md).
The admin account can be used to add additional users. As the account has full admin privileges the credentials should be treated with extreme care.
To override the default set of users, you can customize the variable:
You can change this file by modifying the variable, opensearch_internal_users_path, where the default can be
found in:
This section details the configuration of prometheus.
Internally, we use the cloudalchemy.prometheus role. You can customise any of the variables that the role supports. For a full list, please see the upstream documentation. The appliance defaults can be found here:
The prometheus group determines the placement of the prometheus service. Load balancing is currently unsupported so it is important that you only assign one host to this group.
Prometheus is exposed on port 9090 on all hosts in the prometheus group. Currently, the configuration assumes a single host. Following the reference layout in environments/common/layouts/everything, this will be set to the slurm control node, prometheus would then be accessible from:
http://<control_node_ip>:9090
The port can customised by overriding the prometheus_web_external_url variable.
Note that this service is not password protected, allowing anyone with access to the URL to make queries.
The upstream documentation can be found here.
This appliance provides a default set of recording rules which can be found here:
The intended purpose is to pre-compute some expensive queries that are used in the reference set of grafana dashboards.
To add new, or to remove rules you will be to adjust the prometheus_alert_rules_files variable. The default value can be found in:
You can extend this variable in your environment specific configuration to reference extra files or to remove the defaults. The reference set of dashboards expect these variables to be defined, so if you remove them, you will also have to update your dashboards.
The upstream documentation can be found here.
Collects OS level metrics such as CPU usage, Memory usage, and IO statistics. The metrics that are collected can be controlled by enabling different sets of collectors. For a full list of collectors that are available, see the upstream documentation.
This appliance customises the default set of collectors to a minimal set, these are:
- netdev
- cpu
- meminfo
- infiniband
- cpufreq
The list can be customised by overriding the collect[] parameter of the node job in the prometheus_scrape_configs dictionary. The defaults can be found in:
environments/common/inventory/group_vars/all/prometheus.yml.
Variables in this file should not be customised directly, but should be overridden in your environment. See README.md which details the process of overriding default variables in more detail.
Groups prometheus targets into per environment groups. The ansible variable, env is used to determine the grouping. The metrics for each target in the group are given the prometheus label, env: $env, where $env is the value of the env variable for that host.
Slurm stats periodically queries the slurm accounting database to gather information about slurm jobs. The information it collects is output to a log file on the host at the following path:
/var/log/slurm-stats/finished_jobs.json
The polling of this data is controlled by a cron job. The default is to scrape the data every 5 minutes.
slurm-stats is configured slurm-stats role in the slurm_openstack_tools collection. Currently there is no customisation of this role in the common environment i.e we are just using role defaults. It is possible to override these by setting the relevant variable in your environment config. See here for a list of variables that can be set.
The slurm_stats group controls the placement of the slurm_stats service.
This should be configured to be a group with a single host. That host must be co-located on the same host as the filebeat service that scrapes its output.