After first help from Marco

software/mioga/instance-apacheperl.cfg

 [buildout]
 parts =
+  postgres-urlparse
   apacheperl-promise
   publish-connection-information
+#  mioga-instance
 
 eggs-directory = ${buildout:eggs-directory}
 develop-eggs-directory = ${buildout:develop-eggs-directory}
@@ -44,3 +46,25 @@ port = $${apacheperl-instance:port}
 [publish-connection-information]
 recipe = slapos.cookbook:publish
 apacheperl_url = http://[$${apacheperl-instance:ip}]:$${apacheperl-instance:port}
+
+# Request Postgres instance and parse its URL
+[request-postgres]
+<= slap-connection
+recipe = slapos.cookbook:request
+name = Postgres
+software-url = $${slap-connection:software-release-url}
+software-type = postgres
+return = url
+sla = computer_guid
+sla-computer_guid = $${slap-connection:computer-id}
+
+[postgres-urlparse]
+recipe = slapos.cookbook:urlparse
+url = $${request-postgres:connection-url}
+
+[symlinks]
+recipe = cns.recipe.symlink
+symlink_target = $${rootdirectory:bin}
+symlink_base = ${postgresql:location}/bin
+
+# [mioga-instance]
\ No newline at end of file

software/mioga/instance-postgres.cfg

+[buildout]
+parts =
+  symlinks
+  publish
+  postgres-instance
+  postgres-promise
+
+
+# Define egg directories to be the one from Software Release
+# (/opt/slapgrid/...)
+eggs-directory = ${buildout:eggs-directory}
+develop-eggs-directory = ${buildout:develop-eggs-directory}
+offline = true
+
+
+[instance-parameters]
+# Fetches parameters defined in SlapOS Master for this instance
+recipe = slapos.cookbook:slapconfiguration
+computer = $${slap-connection:computer-id}
+partition = $${slap-connection:partition-id}
+url = $${slap-connection:server-url}
+key = $${slap-connection:key-file}
+cert = $${slap-connection:cert-file}
+
+
+[rootdirectory]
+recipe = slapos.cookbook:mkdirectory
+bin = $${buildout:directory}/bin
+etc = $${buildout:directory}/etc
+services = $${rootdirectory:etc}/run/
+promises = $${rootdirectory:etc}/promise/
+var = $${buildout:directory}/var
+
+
+[symlinks]
+recipe = cns.recipe.symlink
+symlink_target = $${rootdirectory:bin}
+symlink_base = ${postgresql:location}/bin
+
+[postgres-instance]
+# create cluster, configuration files and a database
+recipe = slapos.cookbook:postgres
+
+# Options
+ipv6_host = $${slap-network-information:global-ipv6}
+user = postgres
+port = 5432
+dbname = db
+# pgdata_directory is created by initdb, and should not exist beforehand.
+pgdata-directory = $${rootdirectory:var}/data
+services = $${rootdirectory:services}
+bin = $${rootdirectory:bin}
+
+
+# Deploy promises scripts
+[postgres-promise]
+recipe = slapos.cookbook:check_port_listening
+path = $${rootdirectory:promises}/postgres
+hostname = $${slap-network-information:global-ipv6}
+port = $${postgres-instance:port}
+
+
+[publish]
+recipe = slapos.cookbook:publishurl
+url = $${postgres-instance:url}

software/mioga/instance.cfg

@@ -9,12 +9,13 @@ offline = true
 [switch-softwaretype]
 recipe = slapos.cookbook:softwaretype
 default = ${template-apacheperl:output}
+postgres = ${template-postgres:output}
 
-[slap-connection]
-# part to migrate to new - separated words
-computer-id = $${slap_connection:computer_id}
-partition-id = $${slap_connection:partition_id}
-server-url = $${slap_connection:server_url}
-software-release-url = $${slap_connection:software_release_url}
-key-file = $${slap_connection:key_file}
-cert-file = $${slap_connection:cert_file}
\ No newline at end of file
+# [slap-connection]
+# # part to migrate to new - separated words
+# computer-id = $${slap_connection:computer_id}
+# partition-id = $${slap_connection:partition_id}
+# server-url = $${slap_connection:server_url}
+# software-release-url = $${slap_connection:software_release_url}
+# key-file = $${slap_connection:key_file}
+# cert-file = $${slap_connection:cert_file}
\ No newline at end of file

software/mioga/software.cfg

@@ -22,7 +22,6 @@ extends =
 parts = 
   eggs
   apache-perl
-  template
   perl-Apache2-Request
   perl-Crypt-SSLeay
   perl-DBD-Pg
@@ -36,26 +35,16 @@ parts =
   perl-Search-Xapian
   cpan-simple-modules
   mioga
+  template
+  template-apacheperl
+  template-postgres
 
 [eggs]
 recipe = zc.recipe.egg
 eggs =
   ${lxml-python:egg}
   slapos.cookbook
-
-[template]
-recipe = slapos.recipe.template
-url = ${:_profile_base_location_}/instance.cfg
-# md5sum = 
-output = ${buildout:directory}/template.cfg
-mode = 0644
-
-[template-apacheperl]
-recipe = slapos.recipe.template
-url = ${:_profile_base_location_}/instance-apacheperl.cfg
-# md5sum = 
-output = ${buildout:directory}/template-apacheperl.cfg
-mode = 0644
+  cns.recipe.symlink
 
 [cpan-simple-modules]
 recipe = slapos.recipe.build:cpan
@@ -126,6 +115,27 @@ url = ${:_profile_base_location_}/${:filename}
 download-only = true
 filename = mioga-hooks.py
 
+[template]
+recipe = slapos.recipe.template
+url = ${:_profile_base_location_}/instance.cfg
+# md5sum = 
+output = ${buildout:directory}/template.cfg
+mode = 0644
+
+[template-apacheperl]
+recipe = slapos.recipe.template
+url = ${:_profile_base_location_}/instance-apacheperl.cfg
+# md5sum = 
+output = ${buildout:directory}/template-apacheperl.cfg
+mode = 0644
+
+[template-postgres]
+recipe = slapos.recipe.template
+url = ${:_profile_base_location_}/instance-postgres.cfg
+# md5sum = 
+output = ${buildout:directory}/template-postgres.cfg
+mode = 0644
+
 [networkcache]
 # Cedric de Saint Martin signature certificate
 signature-certificate-list =