Simple gn-guile system container builds

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+# Services
+
+This directory contains small and simple services that may be run independently.
+Note that composition is not the goal.
+For example, databases and web proxies are handled outsite the containers.
+Use these services for simple deployment and ad hoc testing.
+One nice aspect of small system containers is that you can run these easily on your laptop.
+
+IMPORTANT: more complex services do not belong in this directory.
+
+# Examples
+
+## gn-guile
+
+`gn-guile` is our next generation service (gn4?). It provides a REST API, at this point, and some portals, such as https://aging.genenetwork.org/.
+
+See the [gn-guile](./gn-guile.scm) system definition example.
diff --git a/services/gn-guile.scm b/services/gn-guile.scm
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+;; This is an example definition for the gn-guile/GN4 service
+;;
+;; Run with
+;;
+;;   export runner=$(guix system container gn-guile.scm)
+;;
+;; as root
+;;
+;;   sudo bash -c $runner
+;;   echo $runner
+;;
+;; make a note of pid and
+;;
+;;   sudo bash -c "nsenter -a -t 4050285"
+;;
+;; now you should be inside the container (note bash should be in the container!)
+
+(use-modules (gnu)
+             (guix records)
+             (forge utils))
+
+(define-record-type* <gn-guile-configuration>
+  gn-guile-configuration make-gn-guile-configuration
+  gn-guile-configuration?
+  (gn2-repository gn-guile-configuration-gn2-repository
+                  (default "https://github.com/genenetwork/genenetwork2"))
+  (gn2-port gn-guile-configuration-gn2-port
+            (default 8082)))
+
+
+(define gn-guile-service-type
+  (service-type
+   (name 'gn-guile)
+   (description "gn-guile/GN4 webservice")
+   (extensions '())
+   ))
+
+(operating-system
+ (host-name "gn-guile")
+ (timezone "UTC")
+ (locale "en_US.utf8")
+ (bootloader (bootloader-configuration
+              (bootloader grub-bootloader)
+              (targets (list "/dev/sdX"))))
+ (file-systems %base-file-systems)
+ (users %base-user-accounts)
+ (packages %base-packages)
+
+ (services (cons
+            (service gn-guile-service-type
+                     (gn-guile-configuration))
+            %base-services)))