services: monitoring: Add 'zabbix-server'.

* gnu/services/monitoring.scm (uglify-field-name, serialize-field,
serialize-number, serialize-list, serialize-string, group?, serialize-group,
include-files?, serialize-include-files, zabbix-server-account,
zabbix-server-config-file, zabbix-server-activation,
zabbix-server-shepherd-service, generate-zabbix-server-documentation,
extra-options, serialize-extra-options): New procedures.
(zabbix-server-service-type): New variable.
* gnu/tests/monitoring.scm (%psql-user-create-zabbix,
%psql-db-zabbix-create-script, %psql-db-create-zabbix, %psql-db-import-zabbix,
%zabbix-os, %test-zabbix): New variables.
(run-zabbix-server-test): New procedure.
* doc/guix.texi (Monitoring Services): Document 'zabbix-server'.

squash! services: monitoring: Add 'zabbix-server'.

3 files changed, 497 insertions, 2 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index 20b5013fd9..005ff83080 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -16662,6 +16662,147 @@ Bind the web interface to the specified address.
 @end table
 @end deftp
 
+@subsubheading Zabbix server
+@cindex zabbix zabbix-server
+Zabbix provides monitoring metrics, among others network utilization, CPU load
+and disk space consumption:
+
+@itemize
+@item High performance, high capacity (able to monitor hundreds of thousands of devices).
+@item Auto-discovery of servers and network devices and interfaces.
+@item Low-level discovery, allows to automatically start monitoring new items, file systems or network interfaces among others.
+@item Distributed monitoring with centralized web administration.
+@item Native high performance agents.
+@item SLA, and ITIL KPI metrics on reporting.
+@item High-level (business) view of monitored resources through user-defined visual console screens and dashboards.
+@item Remote command execution through Zabbix proxies.
+@end itemize
+
+@c %start of fragment
+
+Available @code{zabbix-server-configuration} fields are:
+
+@deftypevr {@code{zabbix-server-configuration} parameter} package zabbix-server
+The zabbix-server package.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} string user
+User who will run the Zabbix server.
+
+Defaults to @samp{"zabbix"}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} group group
+Group who will run the Zabbix server.
+
+Defaults to @samp{"zabbix"}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} string db-host
+Database host name.
+
+Defaults to @samp{"127.0.0.1"}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} string db-name
+Database name.
+
+Defaults to @samp{"zabbix"}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} string db-user
+Database user.
+
+Defaults to @samp{"zabbix"}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} string db-password
+Database password.  Please, use @code{include-files} with
+@code{DBPassword=SECRET} inside a specified file instead.
+
+Defaults to @samp{""}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} number db-port
+Database port.
+
+Defaults to @samp{5432}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} string log-type
+Specifies where log messages are written to:
+
+@itemize @bullet
+@item
+@code{system} - syslog.
+
+@item
+@code{file} - file specified with @code{log-file} parameter.
+
+@item
+@code{console} - standard output.
+
+@end itemize
+
+Defaults to @samp{""}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} string log-file
+Log file name for @code{log-type} @code{file} parameter.
+
+Defaults to @samp{"/var/log/zabbix/server.log"}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} string pid-file
+Name of PID file.
+
+Defaults to @samp{"/var/run/zabbix/zabbix_server.pid"}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} string ssl-ca-location
+The location of certificate authority (CA) files for SSL server
+certificate verification.
+
+Defaults to @samp{"/etc/ssl/certs/ca-certificates.crt"}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} string ssl-cert-location
+Location of SSL client certificates.
+
+Defaults to @samp{"/etc/ssl/certs"}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} string extra-options
+Extra options will be appended to Zabbix server configuration file.
+
+Defaults to @samp{""}.
+
+@end deftypevr
+
+@deftypevr {@code{zabbix-server-configuration} parameter} include-files include-files
+You may include individual files or all files in a directory in the
+configuration file.
+
+Defaults to @samp{()}.
+
+@end deftypevr
+
+
+@c %end of fragment
+
 @node Kerberos Services
 @subsubsection Kerberos Services
 @cindex Kerberos
diff --git a/gnu/services/monitoring.scm b/gnu/services/monitoring.scm
index aa3b63a0e4..cb1f71ebff 100644
--- a/gnu/services/monitoring.scm
+++ b/gnu/services/monitoring.scm
@@ -1,6 +1,7 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2018 Sou Bunnbu <iyzsong@member.fsf.org>
 ;;; Copyright © 2018 Gábor Boskovits <boskovits@gmail.com>
+;;; Copyright © 2018 Oleg Pykhalov <go.wigust@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -19,17 +20,23 @@
 
 (define-module (gnu services monitoring)
   #:use-module (gnu services)
+  #:use-module (gnu services configuration)
   #:use-module (gnu services shepherd)
   #:use-module (gnu packages admin)
   #:use-module (gnu packages monitoring)
   #:use-module (gnu system shadow)
   #:use-module (guix gexp)
+  #:use-module (guix packages)
   #:use-module (guix records)
   #:use-module (ice-9 match)
+  #:use-module (srfi srfi-26)
   #:export (darkstat-configuration
             prometheus-node-exporter-configuration
             darkstat-service-type
-            prometheus-node-exporter-service-type))
+            prometheus-node-exporter-service-type
+
+            zabbix-server-configuration
+            zabbix-server-service-type))
 
 
 ;;;
@@ -125,3 +132,185 @@ prometheus.")
     (list (service-extension
            shepherd-root-service-type
            (compose list prometheus-node-exporter-shepherd-service))))))
+
+
+;;;
+;;; Zabbix server
+;;;
+
+(define (uglify-field-name field-name)
+  (apply string-append
+         (map (lambda (str)
+                (if (member (string->symbol str) '(ca db ssl))
+                    (string-upcase str)
+                    (string-capitalize str)))
+              (string-split (string-delete #\?
+                                           (symbol->string field-name))
+                            #\-))))
+
+(define (serialize-field field-name val)
+  (format #t "~a=~a~%" (uglify-field-name field-name) val))
+
+(define (serialize-number field-name val)
+  (serialize-field field-name (number->string val)))
+
+(define (serialize-list field-name val)
+  (if (null? val) "" (serialize-field field-name (string-join val ","))))
+
+(define (serialize-string field-name val)
+  (if (and (string? val) (string=? val ""))
+      ""
+      (serialize-field field-name val)))
+
+(define group? string?)
+
+(define serialize-group
+  (const ""))
+
+(define include-files? list?)
+
+(define (serialize-include-files field-name val)
+  (if (null? val) "" (for-each (cut serialize-field 'include <>) val)))
+
+(define extra-options? string?)
+
+(define (serialize-extra-options field-name val)
+  (if (null? val) "" (display val)))
+
+(define-configuration zabbix-server-configuration
+  (zabbix-server
+   (package zabbix-server)
+   "The zabbix-server package.")
+  (user
+   (string "zabbix")
+   "User who will run the Zabbix server.")
+  (group ;for zabbix-server-account procedure
+   (group "zabbix")
+   "Group who will run the Zabbix server.")
+  (db-host
+   (string "127.0.0.1")
+   "Database host name.")
+  (db-name
+   (string "zabbix")
+   "Database name.")
+  (db-user
+   (string "zabbix")
+   "Database user.")
+  (db-password
+   (string "")
+   "Database password.  Please, use @code{include-files} with
+@code{DBPassword=SECRET} inside a specified file instead.")
+  (db-port
+   (number 5432)
+   "Database port.")
+  (log-type
+   (string "")
+   "Specifies where log messages are written to:
+@itemize
+@item @code{system} - syslog.
+@item @code{file} - file specified with @code{log-file} parameter.
+@item @code{console} - standard output.
+@end itemize\n")
+  (log-file
+   (string "/var/log/zabbix/server.log")
+   "Log file name for @code{log-type} @code{file} parameter.")
+  (pid-file
+   (string  "/var/run/zabbix/zabbix_server.pid")
+   "Name of PID file.")
+  (ssl-ca-location
+   (string "/etc/ssl/certs/ca-certificates.crt")
+   "The location of certificate authority (CA) files for SSL server
+certificate verification.")
+  (ssl-cert-location
+   (string "/etc/ssl/certs")
+   "Location of SSL client certificates.")
+  (extra-options
+   (extra-options "")
+   "Extra options will be appended to Zabbix server configuration file.")
+  (include-files
+   (include-files '())
+   "You may include individual files or all files in a directory in the
+configuration file."))
+
+(define (zabbix-server-account config)
+  "Return the user accounts and user groups for CONFIG."
+  (let ((zabbix-user (zabbix-server-configuration-user config))
+        (zabbix-group (zabbix-server-configuration-group config)))
+    (list (user-group (name zabbix-group) (system? #t))
+          (user-account
+           (name zabbix-user)
+           (system? #t)
+           (group zabbix-group)
+           (comment "zabbix privilege separation user")
+           (home-directory (string-append "/var/run/" zabbix-user))
+           (shell #~(string-append #$shadow "/sbin/nologin"))))))
+
+(define (zabbix-server-config-file config)
+  "Return the zabbix-server configuration file corresponding to CONFIG."
+  (computed-file
+   "zabbix_server.conf"
+   #~(begin
+       (call-with-output-file #$output
+         (lambda (port)
+           (display "# Generated by 'zabbix-server-service'.\n" port)
+           (display #$(with-output-to-string
+                        (lambda ()
+                          (serialize-configuration
+                           config zabbix-server-configuration-fields)))
+                    port)
+           #t)))))
+
+(define (zabbix-server-activation config)
+  "Return the activation gexp for CONFIG."
+  (with-imported-modules '((guix build utils)
+                           (ice-9 rdelim))
+    #~(begin
+        (use-modules (guix build utils)
+                     (ice-9 rdelim))
+        (let ((user (getpw #$(zabbix-server-configuration-user config))))
+          (for-each (lambda (file)
+                      (let ((directory (dirname file)))
+                        (mkdir-p directory)
+                        (chown directory (passwd:uid user) (passwd:gid user))
+                        (chmod directory #o755)))
+                    (list #$(zabbix-server-configuration-log-file config)
+                          #$(zabbix-server-configuration-pid-file config)
+                          "/etc/zabbix/maintenance.inc.php"))))))
+
+(define (zabbix-server-shepherd-service config)
+  "Return a <shepherd-service> for Zabbix server with CONFIG."
+  (list (shepherd-service
+         (provision '(zabbix-server))
+         (documentation "Run Zabbix server daemon.")
+         (start #~(make-forkexec-constructor
+                   (list #$(file-append (zabbix-server-configuration-zabbix-server config)
+                                        "/sbin/zabbix_server")
+                         "--config" #$(zabbix-server-config-file config)
+                         "--foreground")
+                   #:user #$(zabbix-server-configuration-user config)
+                   #:group #$(zabbix-server-configuration-group config)
+                   #:pid-file #$(zabbix-server-configuration-pid-file config)
+                   #:environment-variables
+                   (list "SSL_CERT_DIR=/run/current-system/profile\
+/etc/ssl/certs"
+                         "SSL_CERT_FILE=/run/current-system/profile\
+/etc/ssl/certs/ca-certificates.crt")))
+         (stop #~(make-kill-destructor)))))
+
+(define zabbix-server-service-type
+  (service-type
+   (name 'zabbix-server)
+   (extensions
+    (list (service-extension shepherd-root-service-type
+                             zabbix-server-shepherd-service)
+          (service-extension account-service-type
+                             zabbix-server-account)
+          (service-extension activation-service-type
+                             zabbix-server-activation)))
+   (default-value (zabbix-server-configuration))))
+
+(define (generate-zabbix-server-documentation)
+  (generate-documentation
+   `((zabbix-server-configuration
+      ,zabbix-server-configuration-fields))
+   'zabbix-server-configuration))
diff --git a/gnu/tests/monitoring.scm b/gnu/tests/monitoring.scm
index 3320a19a77..edc41c4a30 100644
--- a/gnu/tests/monitoring.scm
+++ b/gnu/tests/monitoring.scm
@@ -1,5 +1,6 @@
 ;;; GNU Guix --- Functional package management for GNU
 ;;; Copyright © 2018 Gábor Boskovits  <boskovits@gmail.com>
+;;; Copyright © 2018 Oleg Pykhalov <go.wigust@gmail.com>
 ;;;
 ;;; This file is part of GNU Guix.
 ;;;
@@ -17,13 +18,19 @@
 ;;; along with GNU Guix.  If not, see <http://www.gnu.org/licenses/>.
 
 (define-module (gnu tests monitoring)
+  #:use-module (gnu packages databases)
+  #:use-module (gnu packages monitoring)
   #:use-module (gnu services)
   #:use-module (gnu services monitoring)
   #:use-module (gnu services networking)
+  #:use-module (gnu services databases)
+  #:use-module (gnu services shepherd)
   #:use-module (gnu system vm)
+  #:use-module (gnu system)
   #:use-module (gnu tests)
   #:use-module (guix gexp)
-  #:export (%test-prometheus-node-exporter))
+  #:export (%test-prometheus-node-exporter
+            %test-zabbix))
 
 
 ;;;
@@ -95,3 +102,161 @@
    (description "Connect to a running prometheus-node-exporter server.")
    (value (run-prometheus-node-exporter-server-test
            name %prometheus-node-exporter-os))))
+
+
+;;;
+;;; Zabbix
+;;;
+
+(define %psql-user-create-zabbix
+  "\
+sudo -u postgres psql <<< \"create user zabbix password 'zabbix';\"
+")
+
+(define %psql-db-zabbix-create-script
+  "\
+sudo -u postgres psql --no-align <<< \\\\du
+")
+
+(define %psql-db-create-zabbix
+  "\
+sudo -u postgres createdb -O zabbix -E Unicode -T template0 zabbix
+")
+
+(define %psql-db-import-zabbix
+  #~(format #f "\
+cat ~a | sudo -u zabbix psql zabbix;
+cat ~a | sudo -u zabbix psql zabbix;
+cat ~a | sudo -u zabbix psql zabbix;
+"
+            (string-append #$zabbix-server:schema
+                           "/database/postgresql/schema.sql")
+            (string-append #$zabbix-server:schema
+                           "/database/postgresql/images.sql")
+            (string-append #$zabbix-server:schema
+                           "/database/postgresql/data.sql")))
+
+(define* (run-zabbix-server-test name test-os)
+  "Run tests in %ZABBIX-OS, which has zabbix running."
+  (define os
+    (marionette-operating-system
+     test-os
+     #:imported-modules '((gnu services herd))))
+
+  (define vm
+    (virtual-machine
+     (operating-system os)
+     (port-forwardings '((8080 . 80)))
+     (memory-size 1024)))
+
+  (define test
+    (with-imported-modules '((gnu build marionette))
+      #~(begin
+          (use-modules (srfi srfi-11)
+                       (srfi srfi-64)
+                       (gnu build marionette)
+                       (web client)
+                       (web response)
+                       (ice-9 popen)
+                       (ice-9 rdelim))
+
+          (define marionette
+            (make-marionette (list #$vm)))
+
+          (mkdir #$output)
+          (chdir #$output)
+
+          (test-begin #$name)
+
+          ;; XXX: Shepherd reads the config file *before* binding its control
+          ;; socket, so /var/run/shepherd/socket might not exist yet when the
+          ;; 'marionette' service is started.
+          (test-assert "shepherd socket ready"
+            (marionette-eval
+             `(begin
+                (use-modules (gnu services herd))
+                (let loop ((i 10))
+                  (cond ((file-exists? (%shepherd-socket-file))
+                         #t)
+                        ((> i 0)
+                         (sleep 1)
+                         (loop (- i 1)))
+                        (else
+                         'failure))))
+             marionette))
+
+          (test-assert "postgres service running"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd))
+                (start-service 'postgres))
+             marionette))
+
+          (test-eq "postgres create zabbix user"
+            0
+            (marionette-eval '(begin (system #$%psql-user-create-zabbix))
+                             marionette))
+
+          (test-equal "postgres find zabbix user"
+            "List of roles
+Role name|Attributes|Member of
+postgres|Superuser, Create role, Create DB, Replication, Bypass RLS|{}
+zabbix||{}
+"
+            (marionette-eval
+             '(begin (let* ((port (open-pipe #$%psql-db-zabbix-create-script
+                                             OPEN_READ))
+                            (output (read-string port))
+                            (status (close-pipe port)))
+                       output))
+             marionette))
+
+          (test-eq "postgres create zabbix db"
+            0
+            (marionette-eval '(begin (system #$%psql-db-create-zabbix))
+                             marionette))
+
+          (test-eq "postgres import zabbix db"
+            0
+            (marionette-eval '(begin (system #$%psql-db-import-zabbix))
+                             marionette))
+
+          ;; Wait for zabbix-server to be up and running.
+          (test-assert "zabbix-server running"
+            (marionette-eval
+             '(begin
+                (use-modules (gnu services herd))
+                (start-service 'zabbix-server))
+             marionette))
+
+          ;; Make sure the PID file is created.
+          (test-assert "zabbix-server PID file"
+            (marionette-eval
+             '(file-exists? "/var/run/zabbix/zabbix_server.pid")
+             marionette))
+
+          (test-end)
+
+          (exit (= (test-runner-fail-count (test-runner-current)) 0)))))
+
+  (gexp->derivation (string-append name "-test") test))
+
+(define %zabbix-os
+  ;; Return operating system under test.
+  (let ((base-os
+         (simple-operating-system
+          (service dhcp-client-service-type)
+          (postgresql-service)
+          (service zabbix-server-service-type
+                   (zabbix-server-configuration
+                    (db-password "zabbix")
+                    (log-type "console"))))))
+    (operating-system
+      (inherit base-os)
+      (packages (cons* postgresql (operating-system-packages base-os))))))
+
+(define %test-zabbix
+  (system-test
+   (name "zabbix")
+   (description "Connect to a running Zabbix")
+   (value (run-zabbix-server-test name %zabbix-os))))