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authorChristopher Baines <mail@cbaines.net>2020-11-28 10:58:02 +0000
committerChristopher Baines <mail@cbaines.net>2020-12-07 09:08:20 +0000
commitfd14385581e4f3f8285442a0e1cc17d320d35fa9 (patch)
treeffb45b7c994a057299b89847fe57494d7138239d
parent6eba27f7beb1320b1abd6123d969663e5a460f77 (diff)
prometheus-node-exporter: Enable the textfile collector.
* 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.
-rw-r--r--doc/guix.texi5
-rw-r--r--gnu/services/monitoring.scm27
2 files changed, 29 insertions, 3 deletions
diff --git a/doc/guix.texi b/doc/guix.texi
index b5340aa368..13e0dcf6b7 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -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
diff --git a/gnu/services/monitoring.scm b/gnu/services/monitoring.scm
index faa1e71dcb..a7fd4328cf 100644
--- a/gnu/services/monitoring.scm
+++ b/gnu/services/monitoring.scm
@@ -126,7 +126,9 @@ HTTP.")
(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 @@ HTTP.")
(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 @@ HTTP.")
(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 @@ Prometheus.")
(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))))