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prometheus-node-exporter: Enable the textfile collector.

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* gnu/services/monitoring.scm (<prometheus-node-exporter-configuration>): Add
textfile-directory.
(prometheus-node-exporter-textfile-directory,
prometheus-node-exporter-activation): New procedures.
(prometheus-node-exporter-shepherd-service): Pass
--collector.textfile.directoryto the service.
(prometheus-node-exporter-service-type): Extend the activation service type.
* doc/guix.texi (Prometheus Node Exporter Service): Document.
This commit is contained in:
Christopher Baines 2020-11-28 10:58:02 +00:00
parent 6eba27f7be
commit fd14385581
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GPG key ID: 5E28A33B0B84F577
2 changed files with 29 additions and 3 deletions
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5
doc/guix.texi
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@ -22038,6 +22038,11 @@ The prometheus-node-exporter package to use.
@item @code{web-listen-address} (default: @code{":9100"})
Bind the web interface to the specified address.
@item @code{textfile-directory} (default: @code{"/var/lib/prometheus/node-exporter"})
This directory can be used to export metrics specific to this machine.
Files containing metrics in the text format, with the filename ending in
@code{.prom} should be placed in this directory.
@end table
@end deftp

27
gnu/services/monitoring.scm
View file

@ -126,7 +126,9 @@ (define-record-type* <prometheus-node-exporter-configuration>
(package prometheus-node-exporter-configuration-package
(default go-github-com-prometheus-node-exporter))
(web-listen-address prometheus-node-exporter-web-listen-address
(default ":9100")))
(default ":9100"))
(textfile-directory prometheus-node-exporter-textfile-directory
(default "/var/lib/prometheus/node-exporter")))
(define %prometheus-node-exporter-accounts
(list (user-account
@ -143,7 +145,7 @@ (define %prometheus-node-exporter-accounts
(define prometheus-node-exporter-shepherd-service
(match-lambda
(( $ <prometheus-node-exporter-configuration>
package web-listen-address)
package web-listen-address textfile-directory)
(list
(shepherd-service
(documentation "Prometheus node exporter.")
@ -151,12 +153,29 @@ (define prometheus-node-exporter-shepherd-service
(requirement '(networking))
(start #~(make-forkexec-constructor
(list #$(file-append package "/bin/node_exporter")
"--web.listen-address" #$web-listen-address)
"--web.listen-address" #$web-listen-address
#$@(if textfile-directory
(list "--collector.textfile.directory"
textfile-directory)
'()))
#:user "prometheus-node-exporter"
#:group "prometheus-node-exporter"
#:log-file "/var/log/prometheus-node-exporter.log"))
(stop #~(make-kill-destructor)))))))
(define (prometheus-node-exporter-activation config)
(with-imported-modules '((guix build utils))
#~(let ((textfile-directory
#$(prometheus-node-exporter-textfile-directory config)))
(use-modules (guix build utils))
(when textfile-directory
(let ((user (getpw "prometheus-node-exporter")))
#t
(mkdir-p textfile-directory)
(chown textfile-directory (passwd:uid user) (passwd:gid user))
(chmod textfile-directory #o775))))))
(define prometheus-node-exporter-service-type
(service-type
(name 'prometheus-node-exporter)
@ -167,6 +186,8 @@ (define prometheus-node-exporter-service-type
(list
(service-extension account-service-type
(const %prometheus-node-exporter-accounts))
(service-extension activation-service-type
prometheus-node-exporter-activation)
(service-extension shepherd-root-service-type
prometheus-node-exporter-shepherd-service)))
(default-value (prometheus-node-exporter-configuration))))