commit ce319f60ad515fd0991e33f91af68aec530228c8 · pyrox.dev/nixpkgs

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nixos/modules/services/monitoring/prometheus/exporters.md

···

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       # Prometheus exporters {#module-services-prometheus-exporters}

     

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       Prometheus exporters provide metrics for the

     

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       [prometheus monitoring system](https://prometheus.io).

     

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       ## Configuration {#module-services-prometheus-exporters-configuration}

     

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       One of the most common exporters is the

     

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       [node exporter](https://github.com/prometheus/node_exporter),

     

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       it provides hardware and OS metrics from the host it's

     

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       running on. The exporter could be configured as follows:

     

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       ```

     

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         services.prometheus.exporters.node = {

     

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           enable = true;

     

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           port = 9100;

     

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           enabledCollectors = [

     

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             "logind"

     

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             "systemd"

     

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           ];

     

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           disabledCollectors = [

     

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             "textfile"

     

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           ];

     

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           openFirewall = true;

     

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           firewallFilter = "-i br0 -p tcp -m tcp --dport 9100";

     

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         };

     

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       ```

     

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       It should now serve all metrics from the collectors that are explicitly

     

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       enabled and the ones that are

     

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       [enabled by default](https://github.com/prometheus/node_exporter#enabled-by-default),

     

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       via http under `/metrics`. In this

     

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       example the firewall should just allow incoming connections to the

     

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       exporter's port on the bridge interface `br0` (this would

     

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       have to be configured separately of course). For more information about

     

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       configuration see `man configuration.nix` or search through

     

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       the [available options](https://nixos.org/nixos/options.html#prometheus.exporters).

     

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       Prometheus can now be configured to consume the metrics produced by the exporter:

     

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       ```

     

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           services.prometheus = {

     

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             # ...

     

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             scrapeConfigs = [

     

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               {

     

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                 job_name = "node";

     

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                 static_configs = [{

     

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                   targets = [ "localhost:${toString config.services.prometheus.exporters.node.port}" ];

     

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                 }];

     

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               }

     

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             ];

     

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             # ...

     

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           }

     

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       ```

     

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       ## Adding a new exporter {#module-services-prometheus-exporters-new-exporter}

     

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       To add a new exporter, it has to be packaged first (see

     

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       `nixpkgs/pkgs/servers/monitoring/prometheus/` for

     

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       examples), then a module can be added. The postfix exporter is used in this

     

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       example:

     

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         - Some default options for all exporters are provided by

     

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           `nixpkgs/nixos/modules/services/monitoring/prometheus/exporters.nix`:

     

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             - `enable`

     

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             - `port`

     

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             - `listenAddress`

     

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             - `extraFlags`

     

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             - `openFirewall`

     

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             - `firewallFilter`

     

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             - `user`

     

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             - `group`

     

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         - As there is already a package available, the module can now be added. This

     

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           is accomplished by adding a new file to the

     

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           `nixos/modules/services/monitoring/prometheus/exporters/`

     

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           directory, which will be called postfix.nix and contains all exporter

     

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           specific options and configuration:

     

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           ```

     

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           # nixpgs/nixos/modules/services/prometheus/exporters/postfix.nix

     

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           { config, lib, pkgs, options }:

     

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           with lib;

     

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           let

     

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             # for convenience we define cfg here

     

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             cfg = config.services.prometheus.exporters.postfix;

     

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           in

     

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           {

     

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             port = 9154; # The postfix exporter listens on this port by default

     

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             # `extraOpts` is an attribute set which contains additional options

     

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             # (and optional overrides for default options).

     

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             # Note that this attribute is optional.

     

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             extraOpts = {

     

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               telemetryPath = mkOption {

     

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                 type = types.str;

     

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                 default = "/metrics";

     

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                 description = ''

     

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                   Path under which to expose metrics.

     

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                 '';

     

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               };

     

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               logfilePath = mkOption {

     

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                 type = types.path;

     

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                 default = /var/log/postfix_exporter_input.log;

     

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                 example = /var/log/mail.log;

     

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                 description = ''

     

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                   Path where Postfix writes log entries.

     

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                   This file will be truncated by this exporter!

     

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                 '';

     

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               };

     

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               showqPath = mkOption {

     

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                 type = types.path;

     

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                 default = /var/spool/postfix/public/showq;

     

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                 example = /var/lib/postfix/queue/public/showq;

     

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                 description = ''

     

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                   Path at which Postfix places its showq socket.

     

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                 '';

     

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               };

     

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             };

     

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             # `serviceOpts` is an attribute set which contains configuration

     

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             # for the exporter's systemd service. One of

     

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             # `serviceOpts.script` and `serviceOpts.serviceConfig.ExecStart`

     

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             # has to be specified here. This will be merged with the default

     

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             # service configuration.

     

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             # Note that by default 'DynamicUser' is 'true'.

     

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             serviceOpts = {

     

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               serviceConfig = {

     

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                 DynamicUser = false;

     

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                 ExecStart = ''

     

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                   ${pkgs.prometheus-postfix-exporter}/bin/postfix_exporter \

     

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                     --web.listen-address ${cfg.listenAddress}:${toString cfg.port} \

     

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                     --web.telemetry-path ${cfg.telemetryPath} \

     

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                     ${concatStringsSep " \\\n  " cfg.extraFlags}

     

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                 '';

     

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               };

     

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             };

     

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           }

     

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           ```

     

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         - This should already be enough for the postfix exporter. Additionally one

     

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           could now add assertions and conditional default values. This can be done

     

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           in the 'meta-module' that combines all exporter definitions and generates

     

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           the submodules:

     

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           `nixpkgs/nixos/modules/services/prometheus/exporters.nix`

     

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       ## Updating an exporter module {#module-services-prometheus-exporters-update-exporter-module}

     

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       Should an exporter option change at some point, it is possible to add

     

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       information about the change to the exporter definition similar to

     

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       `nixpkgs/nixos/modules/rename.nix`:

     

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       ```

     

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       { config, lib, pkgs, options }:

     

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       +
       

     

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       with lib;

     

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       let

     

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         cfg = config.services.prometheus.exporters.nginx;

     

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       in

     

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       {

     

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         port = 9113;

     

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         extraOpts = {

     

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           # additional module options

     

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           # ...

     

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         };

     

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         serviceOpts = {

     

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           # service configuration

     

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           # ...

     

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         };

     

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         imports = [

     

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           # 'services.prometheus.exporters.nginx.telemetryEndpoint' -> 'services.prometheus.exporters.nginx.telemetryPath'

     

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           (mkRenamedOptionModule [ "telemetryEndpoint" ] [ "telemetryPath" ])

     

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           # removed option 'services.prometheus.exporters.nginx.insecure'

     

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           (mkRemovedOptionModule [ "insecure" ] ''

     

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             This option was replaced by 'prometheus.exporters.nginx.sslVerify' which defaults to true.

     

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           '')

     

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           ({ options.warnings = options.warnings; })

     

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         ];

     

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       }

     

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       ```

nixos/modules/services/monitoring/prometheus/exporters.nix

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         );

     

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         meta = {

     

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           # Don't edit the docbook xml directly, edit the md and generate it:

     

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           # `pandoc exporters.md -t docbook --top-level-division=chapter --extract-media=media -f markdown-smart --lua-filter ../../../../../doc/build-aux/pandoc-filters/myst-reader/roles.lua --lua-filter ../../../../../doc/build-aux/pandoc-filters/docbook-writer/rst-roles.lua > exporters.xml`

     

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           doc = ./exporters.xml;

     

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           maintainers = [ maintainers.willibutz ];

     

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         };

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nixos/modules/services/monitoring/prometheus/exporters.xml

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       <chapter xmlns="http://docbook.org/ns/docbook"

     

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                xmlns:xlink="http://www.w3.org/1999/xlink"

     

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                xmlns:xi="http://www.w3.org/2001/XInclude"

     

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                version="5.0"

     

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                xml:id="module-services-prometheus-exporters">

     

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        <title>Prometheus exporters</title>

     

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        <para>

     

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         Prometheus exporters provide metrics for the

     

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         <link xlink:href="https://prometheus.io">prometheus monitoring system</link>.

     

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        </para>

     

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        <section xml:id="module-services-prometheus-exporters-configuration">

     

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         <title>Configuration</title>

     

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       <chapter xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink" xml:id="module-services-prometheus-exporters">

     

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         <title>Prometheus exporters</title>

     

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         <para>

     

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          One of the most common exporters is the

     

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          <link xlink:href="https://github.com/prometheus/node_exporter">node

     

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          exporter</link>, it provides hardware and OS metrics from the host it's

     

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          running on. The exporter could be configured as follows:

     

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       <programlisting>

     

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           Prometheus exporters provide metrics for the

     

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           <link xlink:href="https://prometheus.io">prometheus monitoring

     

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           system</link>.

     

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         </para>

     

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         <section xml:id="module-services-prometheus-exporters-configuration">

     

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           <title>Configuration</title>

     

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           <para>

     

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             One of the most common exporters is the

     

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             <link xlink:href="https://github.com/prometheus/node_exporter">node

     

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             exporter</link>, it provides hardware and OS metrics from the host

     

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             it's running on. The exporter could be configured as follows:

     

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           </para>

     

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           <programlisting>

     

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         services.prometheus.exporters.node = {

     

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           enable = true;

     

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           port = 9100;

     

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           enabledCollectors = [

     

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             "logind"

     

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             "systemd"

     

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             &quot;logind&quot;

     

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             &quot;systemd&quot;

     

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           ];

     

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           disabledCollectors = [

     

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             "textfile"

     

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             &quot;textfile&quot;

     

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           ];

     

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           openFirewall = true;

     

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           firewallFilter = "-i br0 -p tcp -m tcp --dport 9100";

     

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           firewallFilter = &quot;-i br0 -p tcp -m tcp --dport 9100&quot;;

     

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         };

     

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       </programlisting>

     

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          It should now serve all metrics from the collectors that are explicitly

     

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          enabled and the ones that are

     

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          <link xlink:href="https://github.com/prometheus/node_exporter#enabled-by-default">enabled

     

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          by default</link>, via http under <literal>/metrics</literal>. In this

     

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          example the firewall should just allow incoming connections to the

     

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          exporter's port on the bridge interface <literal>br0</literal> (this would

     

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          have to be configured separately of course). For more information about

     

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          configuration see <literal>man configuration.nix</literal> or search through

     

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          the

     

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          <link xlink:href="https://nixos.org/nixos/options.html#prometheus.exporters">available

     

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          options</link>.

     

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         </para>

     

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         <para>

     

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           Prometheus can now be configured to consume the metrics produced by the exporter:

     

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           <para>

     

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             It should now serve all metrics from the collectors that are

     

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             explicitly enabled and the ones that are

     

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             <link xlink:href="https://github.com/prometheus/node_exporter#enabled-by-default">enabled

     

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             by default</link>, via http under <literal>/metrics</literal>. In

     

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             this example the firewall should just allow incoming connections

     

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             to the exporter's port on the bridge interface

     

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             <literal>br0</literal> (this would have to be configured

     

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             separately of course). For more information about configuration

     

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             see <literal>man configuration.nix</literal> or search through the

     

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             <link xlink:href="https://nixos.org/nixos/options.html#prometheus.exporters">available

     

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             options</link>.

     

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           </para>

     

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           <para>

     

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             Prometheus can now be configured to consume the metrics produced

     

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             by the exporter:

     

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           </para>

     

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           <programlisting>

     

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           services.prometheus = {

     

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             # ...

     

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             scrapeConfigs = [

     

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               {

     

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                 job_name = "node";

     

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                 job_name = &quot;node&quot;;

     

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                 static_configs = [{

     

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                   targets = [ "localhost:${toString config.services.prometheus.exporters.node.port}" ];

     

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                   targets = [ &quot;localhost:${toString config.services.prometheus.exporters.node.port}&quot; ];

     

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                 }];

     

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               }

     

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             ];

     

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             # ...

     

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           }

     

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           </programlisting>

     

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         </para>

     

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        </section>

     

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        <section xml:id="module-services-prometheus-exporters-new-exporter">

     

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         <title>Adding a new exporter</title>

     

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         <para>

     

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          To add a new exporter, it has to be packaged first (see

     

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          <literal>nixpkgs/pkgs/servers/monitoring/prometheus/</literal> for

     

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          examples), then a module can be added. The postfix exporter is used in this

     

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          example:

     

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         </para>

     

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         <itemizedlist>

     

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          <listitem>

     

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       </programlisting>

     

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         </section>

     

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         <section xml:id="module-services-prometheus-exporters-new-exporter">

     

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           <title>Adding a new exporter</title>

     

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           <para>

     

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            Some default options for all exporters are provided by

     

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            <literal>nixpkgs/nixos/modules/services/monitoring/prometheus/exporters.nix</literal>:

     

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             To add a new exporter, it has to be packaged first (see

     

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             <literal>nixpkgs/pkgs/servers/monitoring/prometheus/</literal> for

     

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             examples), then a module can be added. The postfix exporter is

     

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             used in this example:

     

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           </para>

     

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          </listitem>

     

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          <listitem override='none'>

     

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           <itemizedlist>

     

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       86
       -
            <listitem>

     

       87
       87
       -
             <para>

     

       88
       88
       -
              <literal>enable</literal>

     

       89
       89
       -
             </para>

     

       90
       90
       -
            </listitem>

     

       91
       91
       -
            <listitem>

     

       92
       92
       -
             <para>

     

       93
       93
       -
              <literal>port</literal>

     

       94
       94
       -
             </para>

     

       95
       95
       -
            </listitem>

     

       96
       96
       -
            <listitem>

     

       97
       97
       -
             <para>

     

       98
       98
       -
              <literal>listenAddress</literal>

     

       99
       99
       -
             </para>

     

       100
       100
       -
            </listitem>

     

       101
       101
       -
            <listitem>

     

       102
       102
       -
             <para>

     

       103
       103
       -
              <literal>extraFlags</literal>

     

       104
       104
       -
             </para>

     

       105
       105
       -
            </listitem>

     

       106
       106
       -
            <listitem>

     

       107
       107
       -
             <para>

     

       108
       108
       -
              <literal>openFirewall</literal>

     

       109
       109
       -
             </para>

     

       110
       110
       -
            </listitem>

     

       111
       111
       -
            <listitem>

     

       112
       112
       -
             <para>

     

       113
       113
       -
              <literal>firewallFilter</literal>

     

       114
       114
       -
             </para>

     

       115
       115
       -
            </listitem>

     

       116
       116
       -
            <listitem>

     

       117
       117
       -
             <para>

     

       118
       118
       -
              <literal>user</literal>

     

       119
       119
       -
             </para>

     

       120
       120
       -
            </listitem>

     

       121
       121
       -
            <listitem>

     

       122
       122
       -
             <para>

     

       123
       123
       -
              <literal>group</literal>

     

       124
       124
       -
             </para>

     

       125
       125
       -
            </listitem>

     

       126
       126
       -
           </itemizedlist>

     

       127
       127
       -
          </listitem>

     

       128
       128
       -
          <listitem>

     

       129
       129
       -
           <para>

     

       130
       130
       -
            As there is already a package available, the module can now be added. This

     

       131
       131
       -
            is accomplished by adding a new file to the

     

       132
       132
       -
            <literal>nixos/modules/services/monitoring/prometheus/exporters/</literal>

     

       133
       133
       -
            directory, which will be called postfix.nix and contains all exporter

     

       134
       134
       -
            specific options and configuration:

     

       135
       135
       -
       <programlisting>

     

       74
       74
       +
             <listitem>

     

       75
       75
       +
               <para>

     

       76
       76
       +
                 Some default options for all exporters are provided by

     

       77
       77
       +
                 <literal>nixpkgs/nixos/modules/services/monitoring/prometheus/exporters.nix</literal>:

     

       78
       78
       +
               </para>

     

       79
       79
       +
               <itemizedlist spacing="compact">

     

       80
       80
       +
                 <listitem>

     

       81
       81
       +
                   <para>

     

       82
       82
       +
                     <literal>enable</literal>

     

       83
       83
       +
                   </para>

     

       84
       84
       +
                 </listitem>

     

       85
       85
       +
                 <listitem>

     

       86
       86
       +
                   <para>

     

       87
       87
       +
                     <literal>port</literal>

     

       88
       88
       +
                   </para>

     

       89
       89
       +
                 </listitem>

     

       90
       90
       +
                 <listitem>

     

       91
       91
       +
                   <para>

     

       92
       92
       +
                     <literal>listenAddress</literal>

     

       93
       93
       +
                   </para>

     

       94
       94
       +
                 </listitem>

     

       95
       95
       +
                 <listitem>

     

       96
       96
       +
                   <para>

     

       97
       97
       +
                     <literal>extraFlags</literal>

     

       98
       98
       +
                   </para>

     

       99
       99
       +
                 </listitem>

     

       100
       100
       +
                 <listitem>

     

       101
       101
       +
                   <para>

     

       102
       102
       +
                     <literal>openFirewall</literal>

     

       103
       103
       +
                   </para>

     

       104
       104
       +
                 </listitem>

     

       105
       105
       +
                 <listitem>

     

       106
       106
       +
                   <para>

     

       107
       107
       +
                     <literal>firewallFilter</literal>

     

       108
       108
       +
                   </para>

     

       109
       109
       +
                 </listitem>

     

       110
       110
       +
                 <listitem>

     

       111
       111
       +
                   <para>

     

       112
       112
       +
                     <literal>user</literal>

     

       113
       113
       +
                   </para>

     

       114
       114
       +
                 </listitem>

     

       115
       115
       +
                 <listitem>

     

       116
       116
       +
                   <para>

     

       117
       117
       +
                     <literal>group</literal>

     

       118
       118
       +
                   </para>

     

       119
       119
       +
                 </listitem>

     

       120
       120
       +
               </itemizedlist>

     

       121
       121
       +
             </listitem>

     

       122
       122
       +
             <listitem>

     

       123
       123
       +
               <para>

     

       124
       124
       +
                 As there is already a package available, the module can now be

     

       125
       125
       +
                 added. This is accomplished by adding a new file to the

     

       126
       126
       +
                 <literal>nixos/modules/services/monitoring/prometheus/exporters/</literal>

     

       127
       127
       +
                 directory, which will be called postfix.nix and contains all

     

       128
       128
       +
                 exporter specific options and configuration:

     

       129
       129
       +
               </para>

     

       130
       130
       +
               <programlisting>

     

       136
       131
        
       # nixpgs/nixos/modules/services/prometheus/exporters/postfix.nix

     

       137
       132
        
       { config, lib, pkgs, options }:

     

       138
       133
        
       

     
···

       151
       146
        
         extraOpts = {

     

       152
       147
        
           telemetryPath = mkOption {

     

       153
       148
        
             type = types.str;

     

       154
       154
       -
             default = "/metrics";

     

       149
       149
       +
             default = &quot;/metrics&quot;;

     

       155
       150
        
             description = ''

     

       156
       151
        
               Path under which to expose metrics.

     

       157
       152
        
             '';

     
···

       188
       183
        
               ${pkgs.prometheus-postfix-exporter}/bin/postfix_exporter \

     

       189
       184
        
                 --web.listen-address ${cfg.listenAddress}:${toString cfg.port} \

     

       190
       185
        
                 --web.telemetry-path ${cfg.telemetryPath} \

     

       191
       191
       -
                 ${concatStringsSep " \\\n  " cfg.extraFlags}

     

       186
       186
       +
                 ${concatStringsSep &quot; \\\n  &quot; cfg.extraFlags}

     

       192
       187
        
             '';

     

       193
       188
        
           };

     

       194
       189
        
         };

     

       195
       190
        
       }

     

       196
       191
        
       </programlisting>

     

       197
       197
       -
           </para>

     

       198
       198
       -
          </listitem>

     

       199
       199
       -
          <listitem>

     

       192
       192
       +
             </listitem>

     

       193
       193
       +
             <listitem>

     

       194
       194
       +
               <para>

     

       195
       195
       +
                 This should already be enough for the postfix exporter.

     

       196
       196
       +
                 Additionally one could now add assertions and conditional

     

       197
       197
       +
                 default values. This can be done in the 'meta-module' that

     

       198
       198
       +
                 combines all exporter definitions and generates the

     

       199
       199
       +
                 submodules:

     

       200
       200
       +
                 <literal>nixpkgs/nixos/modules/services/prometheus/exporters.nix</literal>

     

       201
       201
       +
               </para>

     

       202
       202
       +
             </listitem>

     

       203
       203
       +
           </itemizedlist>

     

       204
       204
       +
         </section>

     

       205
       205
       +
         <section xml:id="module-services-prometheus-exporters-update-exporter-module">

     

       206
       206
       +
           <title>Updating an exporter module</title>

     

       200
       207
        
           <para>

     

       201
       201
       -
            This should already be enough for the postfix exporter. Additionally one

     

       202
       202
       -
            could now add assertions and conditional default values. This can be done

     

       203
       203
       -
            in the 'meta-module' that combines all exporter definitions and generates

     

       204
       204
       -
            the submodules:

     

       205
       205
       -
            <literal>nixpkgs/nixos/modules/services/prometheus/exporters.nix</literal>

     

       208
       208
       +
             Should an exporter option change at some point, it is possible to

     

       209
       209
       +
             add information about the change to the exporter definition

     

       210
       210
       +
             similar to <literal>nixpkgs/nixos/modules/rename.nix</literal>:

     

       206
       211
        
           </para>

     

       207
       207
       -
          </listitem>

     

       208
       208
       -
         </itemizedlist>

     

       209
       209
       -
        </section>

     

       210
       210
       -
        <section xml:id="module-services-prometheus-exporters-update-exporter-module">

     

       211
       211
       -
         <title>Updating an exporter module</title>

     

       212
       212
       -
          <para>

     

       213
       213
       -
            Should an exporter option change at some point, it is possible to add

     

       214
       214
       -
            information about the change to the exporter definition similar to

     

       215
       215
       -
            <literal>nixpkgs/nixos/modules/rename.nix</literal>:

     

       216
       216
       -
       <programlisting>

     

       212
       212
       +
           <programlisting>

     

       217
       213
        
       { config, lib, pkgs, options }:

     

       218
       214
        
       

     

       219
       215
        
       with lib;

     
···

       232
       228
        
           # ...

     

       233
       229
        
         };

     

       234
       230
        
         imports = [

     

       235
       235
       -
           # 'services.prometheus.exporters.nginx.telemetryEndpoint' -> 'services.prometheus.exporters.nginx.telemetryPath'

     

       236
       236
       -
           (mkRenamedOptionModule [ "telemetryEndpoint" ] [ "telemetryPath" ])

     

       231
       231
       +
           # 'services.prometheus.exporters.nginx.telemetryEndpoint' -&gt; 'services.prometheus.exporters.nginx.telemetryPath'

     

       232
       232
       +
           (mkRenamedOptionModule [ &quot;telemetryEndpoint&quot; ] [ &quot;telemetryPath&quot; ])

     

       237
       233
        
       

     

       238
       234
        
           # removed option 'services.prometheus.exporters.nginx.insecure'

     

       239
       239
       -
           (mkRemovedOptionModule [ "insecure" ] ''

     

       235
       235
       +
           (mkRemovedOptionModule [ &quot;insecure&quot; ] ''

     

       240
       236
        
             This option was replaced by 'prometheus.exporters.nginx.sslVerify' which defaults to true.

     

       241
       237
        
           '')

     

       242
       238
        
           ({ options.warnings = options.warnings; })

     

       243
       239
        
         ];

     

       244
       240
        
       }

     

       245
       241
        
       </programlisting>

     

       246
       246
       -
           </para>

     

       247
       242
        
         </section>

     

       248
       243
        
       </chapter>