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diff --git a/nixos/modules/services/monitoring/prometheus/exporters.xml b/nixos/modules/services/monitoring/prometheus/exporters.xml deleted file mode 100644 index 0ea95e513ff3..000000000000 --- a/nixos/modules/services/monitoring/prometheus/exporters.xml +++ /dev/null @@ -1,245 +0,0 @@ -<!-- Do not edit this file directly, edit its companion .md instead - and regenerate this file using nixos/doc/manual/md-to-db.sh --> -<chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="module-services-prometheus-exporters"> - <title>Prometheus exporters</title> - <para> - Prometheus exporters provide metrics for the - <link xlink:href="https://prometheus.io">prometheus monitoring - system</link>. - </para> - <section xml:id="module-services-prometheus-exporters-configuration"> - <title>Configuration</title> - <para> - One of the most common exporters is the - <link xlink:href="https://github.com/prometheus/node_exporter">node - exporter</link>, it provides hardware and OS metrics from the host - it’s running on. The exporter could be configured as follows: - </para> - <programlisting> - services.prometheus.exporters.node = { - enable = true; - port = 9100; - enabledCollectors = [ - "logind" - "systemd" - ]; - disabledCollectors = [ - "textfile" - ]; - openFirewall = true; - firewallFilter = "-i br0 -p tcp -m tcp --dport 9100"; - }; -</programlisting> - <para> - It should now serve all metrics from the collectors that are - explicitly enabled and the ones that are - <link xlink:href="https://github.com/prometheus/node_exporter#enabled-by-default">enabled - by default</link>, via http under <literal>/metrics</literal>. In - this example the firewall should just allow incoming connections - to the exporter’s port on the bridge interface - <literal>br0</literal> (this would have to be configured - separately of course). For more information about configuration - see <literal>man configuration.nix</literal> or search through the - <link xlink:href="https://nixos.org/nixos/options.html#prometheus.exporters">available - options</link>. - </para> - <para> - Prometheus can now be configured to consume the metrics produced - by the exporter: - </para> - <programlisting> - services.prometheus = { - # ... - - scrapeConfigs = [ - { - job_name = "node"; - static_configs = [{ - targets = [ "localhost:${toString config.services.prometheus.exporters.node.port}" ]; - }]; - } - ]; - - # ... - } -</programlisting> - </section> - <section xml:id="module-services-prometheus-exporters-new-exporter"> - <title>Adding a new exporter</title> - <para> - To add a new exporter, it has to be packaged first (see - <literal>nixpkgs/pkgs/servers/monitoring/prometheus/</literal> for - examples), then a module can be added. The postfix exporter is - used in this example: - </para> - <itemizedlist> - <listitem> - <para> - Some default options for all exporters are provided by - <literal>nixpkgs/nixos/modules/services/monitoring/prometheus/exporters.nix</literal>: - </para> - <itemizedlist spacing="compact"> - <listitem> - <para> - <literal>enable</literal> - </para> - </listitem> - <listitem> - <para> - <literal>port</literal> - </para> - </listitem> - <listitem> - <para> - <literal>listenAddress</literal> - </para> - </listitem> - <listitem> - <para> - <literal>extraFlags</literal> - </para> - </listitem> - <listitem> - <para> - <literal>openFirewall</literal> - </para> - </listitem> - <listitem> - <para> - <literal>firewallFilter</literal> - </para> - </listitem> - <listitem> - <para> - <literal>user</literal> - </para> - </listitem> - <listitem> - <para> - <literal>group</literal> - </para> - </listitem> - </itemizedlist> - </listitem> - <listitem> - <para> - As there is already a package available, the module can now be - added. This is accomplished by adding a new file to the - <literal>nixos/modules/services/monitoring/prometheus/exporters/</literal> - directory, which will be called postfix.nix and contains all - exporter specific options and configuration: - </para> - <programlisting> -# nixpgs/nixos/modules/services/prometheus/exporters/postfix.nix -{ config, lib, pkgs, options }: - -with lib; - -let - # for convenience we define cfg here - cfg = config.services.prometheus.exporters.postfix; -in -{ - port = 9154; # The postfix exporter listens on this port by default - - # `extraOpts` is an attribute set which contains additional options - # (and optional overrides for default options). - # Note that this attribute is optional. - extraOpts = { - telemetryPath = mkOption { - type = types.str; - default = "/metrics"; - description = '' - Path under which to expose metrics. - ''; - }; - logfilePath = mkOption { - type = types.path; - default = /var/log/postfix_exporter_input.log; - example = /var/log/mail.log; - description = '' - Path where Postfix writes log entries. - This file will be truncated by this exporter! - ''; - }; - showqPath = mkOption { - type = types.path; - default = /var/spool/postfix/public/showq; - example = /var/lib/postfix/queue/public/showq; - description = '' - Path at which Postfix places its showq socket. - ''; - }; - }; - - # `serviceOpts` is an attribute set which contains configuration - # for the exporter's systemd service. One of - # `serviceOpts.script` and `serviceOpts.serviceConfig.ExecStart` - # has to be specified here. This will be merged with the default - # service configuration. - # Note that by default 'DynamicUser' is 'true'. - serviceOpts = { - serviceConfig = { - DynamicUser = false; - ExecStart = '' - ${pkgs.prometheus-postfix-exporter}/bin/postfix_exporter \ - --web.listen-address ${cfg.listenAddress}:${toString cfg.port} \ - --web.telemetry-path ${cfg.telemetryPath} \ - ${concatStringsSep " \\\n " cfg.extraFlags} - ''; - }; - }; -} -</programlisting> - </listitem> - <listitem> - <para> - This should already be enough for the postfix exporter. - Additionally one could now add assertions and conditional - default values. This can be done in the - <quote>meta-module</quote> that combines all exporter - definitions and generates the submodules: - <literal>nixpkgs/nixos/modules/services/prometheus/exporters.nix</literal> - </para> - </listitem> - </itemizedlist> - </section> - <section xml:id="module-services-prometheus-exporters-update-exporter-module"> - <title>Updating an exporter module</title> - <para> - Should an exporter option change at some point, it is possible to - add information about the change to the exporter definition - similar to <literal>nixpkgs/nixos/modules/rename.nix</literal>: - </para> - <programlisting> -{ config, lib, pkgs, options }: - -with lib; - -let - cfg = config.services.prometheus.exporters.nginx; -in -{ - port = 9113; - extraOpts = { - # additional module options - # ... - }; - serviceOpts = { - # service configuration - # ... - }; - imports = [ - # 'services.prometheus.exporters.nginx.telemetryEndpoint' -> 'services.prometheus.exporters.nginx.telemetryPath' - (mkRenamedOptionModule [ "telemetryEndpoint" ] [ "telemetryPath" ]) - - # removed option 'services.prometheus.exporters.nginx.insecure' - (mkRemovedOptionModule [ "insecure" ] '' - This option was replaced by 'prometheus.exporters.nginx.sslVerify' which defaults to true. - '') - ({ options.warnings = options.warnings; }) - ]; -} -</programlisting> - </section> -</chapter> |