diff --git a/.kitchen.yml b/.kitchen.yml
new file mode 100644
index 0000000..ca02fdf
--- /dev/null
+++ b/.kitchen.yml
@@ -0,0 +1,86 @@
+---
+driver:
+  name: docker
+  hostname: maas.ci.local
+  #socket: tcp://127.0.0.1:2376
+  use_sudo: false
+
+
+
+provisioner:
+  name: salt_solo
+  salt_install: bootstrap
+  salt_bootstrap_url: https://bootstrap.saltstack.com
+  salt_version: latest
+  require_chef: false
+  formula: maas
+  log_level: info
+  state_top:
+    base:
+      "*":
+        - rsyslog
+        - postgresql
+        - maas
+  pillars:
+    top.sls:
+      base:
+        "*":
+          - rsyslog
+          - postgresql
+          - linux
+          - maas
+
+  pillars-from-files:
+    postgresql.sls: tests/pillar/postgresql.sls
+    rsyslog.sls: tests/pillar/rsyslog.sls
+    linux.sls: tests/pillar/linux.sls
+
+  grains:
+    noservices: False
+    kitchen-test: True
+
+  dependencies:
+    - name: postgresql
+      repo: git
+      source: https://github.com/salt-formulas/salt-formula-postgresql
+    - name: rsyslog
+      repo: git
+      source: https://github.com/salt-formulas/salt-formula-rsyslog
+
+
+platforms:
+  - name: <%=ENV['PLATFORM'] ||  'saltstack-ubuntu-xenial-salt-stable' %>
+    driver_config:
+      image: <%=ENV['PLATFORM'] || 'epcim/salt-formulas:saltstack-ubuntu-xenial-salt-stable'%>
+      platform: ubuntu
+
+
+verifier:
+  name: inspec
+  sudo: true
+
+
+suites:
+
+
+  - name: maas_cluster
+    provisioner:
+      pillars-from-files:
+        maas.sls: tests/pillar/maas_cluster.sls
+
+  #- name: disk_layout
+    #provisioner:
+      #pillars-from-files:
+        #maas.sls: tests/pillar/disk_layout.sls
+
+  #- name: maas_mirror
+    #provisioner:
+      #pillars-from-files:
+        #maas.sls: tests/pillar/maas_mirror.sls
+
+  #- name: maas_region
+    #provisioner:
+      #pillars-from-files:
+        #maas.sls: tests/pillar/maas_region.sls
+
+# vim: ft=yaml sw=2 ts=2 sts=2 tw=125
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..abc6b38
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,46 @@
+sudo: required
+services:
+  - docker
+
+addons:
+  apt:
+    packages:
+    - apt-transport-https
+
+install:
+  - pip install PyYAML
+  - pip install virtualenv
+  - |
+    test -e Gemfile || cat <<EOF > Gemfile
+    source 'https://rubygems.org'
+    gem 'rake'
+    gem 'test-kitchen'
+    gem 'kitchen-docker'
+    gem 'kitchen-inspec'
+    gem 'inspec'
+    gem 'kitchen-salt'   #, :git => 'https://github.com/salt-formulas/kitchen-salt.git'
+  - bundle install
+
+env:
+    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2017.7
+    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-xenial-salt-2016.3
+#    - PLATFORM=epcim/salt-formulas:saltstack-ubuntu-bionic-salt-2017.7
+
+before_script:
+  - set -o pipefail
+  - make test | tail
+
+script:
+  - test ! -e .kitchen.yml || bundle exec kitchen converge ${SUITE} || true
+  - test ! -e .kitchen.yml || bundle exec kitchen verify ${SUITE} -t tests/integration
+
+notifications:
+  webhooks:
+    urls:
+      - https://webhooks.gitter.im/e/6123573504759330786b
+    on_success: change # options: [always|never|change] default: always
+    on_failure: never  # options: [always|never|change] default: always
+    on_start: never    # options: [always|never|change] default: always
+    on_cancel: never   # options: [always|never|change] default: always
+    on_error: never    # options: [always|never|change] default: always
+  email: false
diff --git a/Makefile b/Makefile
index d166862..f9b4f47 100644
--- a/Makefile
+++ b/Makefile
@@ -34,6 +34,7 @@ all:
 	@echo "make release-major  - Generate new major release"
 	@echo "make release-minor  - Generate new minor release"
 	@echo "make changelog      - Show changes since last release"
+	@echo "make test-model-validate      - Run salt jsonschema validation"
 
 install:
 	# Formula
@@ -41,6 +42,7 @@ install:
 	cp -a $(FORMULANAME) $(DESTDIR)/$(SALTENVDIR)/
 	[ ! -d _modules ] || cp -a _modules $(DESTDIR)/$(SALTENVDIR)/
 	[ ! -d _states ] || cp -a _states $(DESTDIR)/$(SALTENVDIR)/ || true
+	[ ! -d _engines ] || cp -a _engines $(DESTDIR)/$(SALTENVDIR)/ || true
 	[ ! -d _grains ] || cp -a _grains $(DESTDIR)/$(SALTENVDIR)/ || true
 	# Metadata
 	[ -d $(DESTDIR)/$(RECLASSDIR)/service/$(FORMULANAME) ] || mkdir -p $(DESTDIR)/$(RECLASSDIR)/service/$(FORMULANAME)
@@ -52,6 +54,10 @@ lint:
 test:
 	[ ! -d tests ] || (cd tests; ./run_tests.sh)
 
+test-model-validate:
+	# TODO make it actually fail
+	[ ! -d $(FORMULANAME)/schemas/ ] || (cd tests; ./run_tests.sh model-validate)
+
 release-major: check-changes
 	@echo "Current version is $(VERSION), new version is $(NEW_MAJOR_VERSION)"
 	@[ $(VERSION_MAJOR) != $(NEW_MAJOR_VERSION) ] || (echo "Major version $(NEW_MAJOR_VERSION) already released, nothing to do. Do you want release-minor?" && exit 1)
diff --git a/README.rst b/README.rst
index e466959..351b097 100644
--- a/README.rst
+++ b/README.rst
@@ -16,6 +16,27 @@ Single maas service
       server:
         enabled: true
 
+Configure node interfaces.
+
+Interfaces are identified by provided `name` or by `mac` if `name` is not provided or not found.
+When configured name is not found interface name will be renamed.
+
+.. code-block:: yaml
+
+  maas:
+    region:
+      machines:
+        machine1:
+          pxe_interface_mac: "11:22:33:44:55:66"
+          interfaces:
+            nic01:
+              name: eth0
+              mac: "11:22:33:44:55:66"
+              mode: "static"
+              ip: "2.2.3.19"
+              subnet: "subnet1"
+              gateway: "2.2.3.2"
+
 Single MAAS region service [single UI/API]
 
 .. code-block:: yaml
@@ -471,6 +492,14 @@ MAAS region service with backup data
             source: cfg01.local
             host: 192.168.0.11
 
+Test pillars
+==============
+
+Mind the postgresql and rsyslog `.sls`. Database and syslog service are required for MAAS to properly install and work.
+
+* https://github.com/salt-formulas/salt-formula-rsyslog/tree/master/tests/pillar
+
+
 Module function's example:
 ==========================
 
diff --git a/_modules/maas.py b/_modules/maas.py
index 426aff5..1c80c5f 100644
--- a/_modules/maas.py
+++ b/_modules/maas.py
@@ -509,6 +509,18 @@ def _get_nic_id_by_mac(self, machine, req_mac=None):
                                 'node:{}'.format(req_mac, machine['fqdn']))
         return data
 
+    def _get_nic_id_by_name(self, machine, req_name=None):
+        data = {}
+        for nic in machine['interface_set']:
+            data[nic['name']] = nic['id']
+        if req_name:
+            if req_name in data.keys():
+                return data[req_name]
+            else:
+                raise Exception('NIC with name:{} not found at '
+                                'node:{}'.format(req_name, machine['fqdn']))
+        return data
+
     def _disconnect_all_nic(self, machine):
         """
             Maas will fail, in case same config's will be to apply
@@ -538,7 +550,18 @@ def _process_interface(self, nic_data,  machine):
             external "process" method. Those broke old-MaasObject logic,
             though make functions more simple in case iterable tasks.
         """
-        nic_id = self._get_nic_id_by_mac(machine, nic_data['mac'])
+
+        if nic_data.has_key('name'):
+            try:
+                nic_id = self._get_nic_id_by_mac(machine, nic_data['name'])
+            except Exception as e:
+                LOG.warn("Failed to find interface: {} on node: {}. Will try now by its MAC: {}".format(
+                    nic_data['name'], machine['fqdn'], nic_data['mac_address']))
+                nic_id = False
+
+        if not nic_id:
+            # assume MAC is always provided
+            nic_id = self._get_nic_id_by_mac(machine, nic_data['mac'])
 
         # Process op=link_subnet
         link_data = {}
diff --git a/maas/cluster.sls b/maas/cluster.sls
index 9fe61bf..59284db 100644
--- a/maas/cluster.sls
+++ b/maas/cluster.sls
@@ -62,5 +62,8 @@ maas_cluster_services:
     - file: /etc/maas/rackd.conf
   - watch:
     - file: /etc/maas/rackd.conf
+  {%- if grains.get('kitchen-test') %}
+  - onlyif: /bin/false
+  {%- endif %}
 
 {%- endif %}
diff --git a/maas/files/regiond.conf b/maas/files/regiond.conf
index 8c9e8df..83b06e8 100644
--- a/maas/files/regiond.conf
+++ b/maas/files/regiond.conf
@@ -1,7 +1,15 @@
 {%- from "maas/map.jinja" import region with context %}
 
+{%- if region.database.host is defined %}
 database_host: {{ region.database.host }}
+{%- endif %}
+{%- if region.database.name is defined %}
 database_name: {{ region.database.name }}
+{%- endif %}
+{%- if region.database.password is defined %}
 database_pass: {{ region.database.password }}
+{%- endif %}
+{%- if region.database.username is defined %}
 database_user: {{ region.database.username }}
+{%- endif %}
 maas_url: http://{{ region.bind.host }}/MAAS
diff --git a/maas/region.sls b/maas/region.sls
index e9711ea..81e0d49 100644
--- a/maas/region.sls
+++ b/maas/region.sls
@@ -109,8 +109,9 @@ maas_apache_headers:
   - require:
     - pkg: maas_region_packages
 
-/root/.pgpass:
+Configure /root/.pgpass for MAAS:
   file.managed:
+  - name: /root/.pgpass
   - source: salt://maas/files/pgpass
   - template: jinja
   - user: root
@@ -125,11 +126,14 @@ maas_region_services:
     - cmd: maas_region_syncdb
   - watch:
     - file: /etc/maas/regiond.conf
+  {%- if grains.get('kitchen-test') %}
+  - onlyif: /bin/false
+  {%- endif %}
 
 maas_region_syncdb:
   cmd.run:
   - names:
-    - maas-region syncdb
+    - maas-region syncdb --noinput
   - require:
     - file: /etc/maas/regiond.conf
 
@@ -139,16 +143,27 @@ maas_set_admin_password:
   - creates: /var/lib/maas/.setup_admin
   - require:
     - service: maas_region_services
+  {%- if grains.get('kitchen-test') %}
+  - onlyif: /bin/false
+  {%- endif %}
 
 maas_login_admin:
   cmd.run:
   - name: "maas-region apikey --username {{ region.admin.username }} > /var/lib/maas/.maas_credentials"
+  - require:
+    - cmd: maas_set_admin_password
+  {%- if grains.get('kitchen-test') %}
+  - onlyif: /bin/false
+  {%- endif %}
 
 maas_config:
   module.run:
   - name: maas.process_maas_config
   - require:
     - cmd: maas_login_admin
+  {%- if grains.get('kitchen-test') %}
+  - onlyif: /bin/false
+  {%- endif %}
 
 {%- if region.get('boot_sources', False)  %}
 maas_boot_sources:
@@ -243,6 +258,9 @@ maas_domain:
   - name: maas.process_domain
   - require:
     - module: maas_config
+  {%- if grains.get('kitchen-test') %}
+  - onlyif: /bin/false
+  {%- endif %}
 
 {%- if region.fabrics is defined %}
 {%- for fabric_name, fabric in region.fabrics.iteritems() %}
diff --git a/metadata.yml b/metadata.yml
index dacbd6f..72d1aea 100644
--- a/metadata.yml
+++ b/metadata.yml
@@ -1,3 +1,8 @@
 name: "maas"
 version: "0.1"
 source: "https://github.com/salt-formulas/salt-formula-maas"
+dependencies:
+- name: postgresql
+  source: "https://github.com/salt-formulas/salt-formula-postgresql"
+- name: rsyslog
+  source: "https://github.com/salt-formulas/salt-formula-rsyslog"
diff --git a/tests/pillar/linux.sls b/tests/pillar/linux.sls
new file mode 100644
index 0000000..a150747
--- /dev/null
+++ b/tests/pillar/linux.sls
@@ -0,0 +1,3 @@
+linux:
+  system:
+    domain: ci.local
diff --git a/tests/pillar/maas_cluster.sls b/tests/pillar/maas_cluster.sls
index af63517..263fcc9 100644
--- a/tests/pillar/maas_cluster.sls
+++ b/tests/pillar/maas_cluster.sls
@@ -1,11 +1,46 @@
 maas:
   cluster:
     enabled: true
+    role: master
     region:
+      port: 80
       host: localhost
-    role: slave
+    saltstack_repo_key: |
+      -----BEGIN PGP PUBLIC KEY BLOCK-----
+      Version: GnuPG v2
+
+      mQENBFOpvpgBCADkP656H41i8fpplEEB8IeLhugyC2rTEwwSclb8tQNYtUiGdna9
+      m38kb0OS2DDrEdtdQb2hWCnswxaAkUunb2qq18vd3dBvlnI+C4/xu5ksZZkRj+fW
+      tArNR18V+2jkwcG26m8AxIrT+m4M6/bgnSfHTBtT5adNfVcTHqiT1JtCbQcXmwVw
+      WbqS6v/LhcsBE//SHne4uBCK/GHxZHhQ5jz5h+3vWeV4gvxS3Xu6v1IlIpLDwUts
+      kT1DumfynYnnZmWTGc6SYyIFXTPJLtnoWDb9OBdWgZxXfHEcBsKGha+bXO+m2tHA
+      gNneN9i5f8oNxo5njrL8jkCckOpNpng18BKXABEBAAG0MlNhbHRTdGFjayBQYWNr
+      YWdpbmcgVGVhbSA8cGFja2FnaW5nQHNhbHRzdGFjay5jb20+iQE4BBMBAgAiBQJT
+      qb6YAhsDBgsJCAcDAgYVCAIJCgsEFgIDAQIeAQIXgAAKCRAOCKFJ3le/vhkqB/0Q
+      WzELZf4d87WApzolLG+zpsJKtt/ueXL1W1KA7JILhXB1uyvVORt8uA9FjmE083o1
+      yE66wCya7V8hjNn2lkLXboOUd1UTErlRg1GYbIt++VPscTxHxwpjDGxDB1/fiX2o
+      nK5SEpuj4IeIPJVE/uLNAwZyfX8DArLVJ5h8lknwiHlQLGlnOu9ulEAejwAKt9CU
+      4oYTszYM4xrbtjB/fR+mPnYh2fBoQO4d/NQiejIEyd9IEEMd/03AJQBuMux62tjA
+      /NwvQ9eqNgLw9NisFNHRWtP4jhAOsshv1WW+zPzu3ozoO+lLHixUIz7fqRk38q8Q
+      9oNR31KvrkSNrFbA3D89uQENBFOpvpgBCADJ79iH10AfAfpTBEQwa6vzUI3Eltqb
+      9aZ0xbZV8V/8pnuU7rqM7Z+nJgldibFk4gFG2bHCG1C5aEH/FmcOMvTKDhJSFQUx
+      uhgxttMArXm2c22OSy1hpsnVG68G32Nag/QFEJ++3hNnbyGZpHnPiYgej3FrerQJ
+      zv456wIsxRDMvJ1NZQB3twoCqwapC6FJE2hukSdWB5yCYpWlZJXBKzlYz/gwD/Fr
+      GL578WrLhKw3UvnJmlpqQaDKwmV2s7MsoZogC6wkHE92kGPG2GmoRD3ALjmCvN1E
+      PsIsQGnwpcXsRpYVCoW7e2nW4wUf7IkFZ94yOCmUq6WreWI4NggRcFC5ABEBAAGJ
+      AR8EGAECAAkFAlOpvpgCGwwACgkQDgihSd5Xv74/NggA08kEdBkiWWwJZUZEy7cK
+      WWcgjnRuOHd4rPeT+vQbOWGu6x4bxuVf9aTiYkf7ZjVF2lPn97EXOEGFWPZeZbH4
+      vdRFH9jMtP+rrLt6+3c9j0M8SIJYwBL1+CNpEC/BuHj/Ra/cmnG5ZNhYebm76h5f
+      T9iPW9fFww36FzFka4VPlvA4oB7ebBtquFg3sdQNU/MmTVV4jPFWXxh4oRDDR+8N
+      1bcPnbB11b5ary99F/mqr7RgQ+YFF0uKRE3SKa7a+6cIuHEZ7Za+zhPaQlzAOZlx
+      fuBmScum8uQTrEF5+Um5zkwC7EXTdH1co/+/V/fpOtxIg4XO4kcugZefVm5ERfVS
+      MA==
+      =dtMN
+      -----END PGP PUBLIC KEY BLOCK-----
+    saltstack_repo_trusty: "http://repo.saltstack.com/apt/ubuntu/14.04/amd64/2016.3/ trusty main"
+    saltstack_repo_xenial: "http://repo.saltstack.com/apt/ubuntu/16.04/amd64/2016.3/ xenial main"
   region:
-    theme: theme
+    theme: mirantis
     bind:
       host: localhost
       port: 80
@@ -16,8 +51,8 @@ maas:
     database:
       engine: postgresql
       host: localhost
-      name: maasdb
-      password: password
-      username: maas
+      #name: maasdb
+      #password: password
+      #username: maas
     enabled: true
     salt_master_ip: 127.0.0.1
diff --git a/tests/pillar/postgresql.sls b/tests/pillar/postgresql.sls
new file mode 100644
index 0000000..cc2d3ed
--- /dev/null
+++ b/tests/pillar/postgresql.sls
@@ -0,0 +1,20 @@
+postgresql:
+  server:
+    enabled: true
+    clients:
+    - 127.0.0.1
+    bind:
+      address: 127.0.0.1
+      port: 5432
+      protocol: tcp
+    #database:
+      #maasdb:
+        #enabled: true
+        #encoding: 'UTF8'
+        #locale: 'en_US'
+        #users:
+        #- name: maas
+          #password: password
+          #host: localhost
+          #createdb: true
+          #rights: all privileges
diff --git a/tests/pillar/rsyslog.sls b/tests/pillar/rsyslog.sls
new file mode 100644
index 0000000..32c26c1
--- /dev/null
+++ b/tests/pillar/rsyslog.sls
@@ -0,0 +1,13 @@
+rsyslog:
+  #server:
+    #enabled: true
+  client:
+    enabled: true
+    #output:
+      #file:
+        #/var/log/syslog:
+          #filter: "*.*;auth,authpriv.none"
+          #owner: syslog
+          #group: adm
+          #createmode: 0640
+          #umask: 0022
diff --git a/tests/run_tests.sh b/tests/run_tests.sh
index 9761585..a348912 100755
--- a/tests/run_tests.sh
+++ b/tests/run_tests.sh
@@ -1,5 +1,9 @@
 #!/usr/bin/env bash
 
+###
+# Script requirments:
+#apt-get install -y python-yaml virtualenv git
+
 set -e
 [ -n "$DEBUG" ] && set -x
 
@@ -14,32 +18,40 @@ BUILDDIR=${BUILDDIR:-${CURDIR}/build}
 VENV_DIR=${VENV_DIR:-${BUILDDIR}/virtualenv}
 MOCK_BIN_DIR=${MOCK_BIN_DIR:-${CURDIR}/mock_bin}
 DEPSDIR=${BUILDDIR}/deps
+SCHEMARDIR=${SCHEMARDIR:-"${CURDIR}/../${FORMULA_NAME}/schemas/"}
 
 SALT_FILE_DIR=${SALT_FILE_DIR:-${BUILDDIR}/file_root}
 SALT_PILLAR_DIR=${SALT_PILLAR_DIR:-${BUILDDIR}/pillar_root}
 SALT_CONFIG_DIR=${SALT_CONFIG_DIR:-${BUILDDIR}/salt}
 SALT_CACHE_DIR=${SALT_CACHE_DIR:-${SALT_CONFIG_DIR}/cache}
+SALT_CACHE_EXTMODS_DIR=${SALT_CACHE_EXTMODS_DIR:-${SALT_CONFIG_DIR}/cache_master_extmods}
 
 SALT_OPTS="${SALT_OPTS} --retcode-passthrough --local -c ${SALT_CONFIG_DIR} --log-file=/dev/null"
 
+IGNORE_MODELVALIDATE_MASK=${IGNORE_MODELVALIDATE_MASK:-"novalidate"}
+
 if [ "x${SALT_VERSION}" != "x" ]; then
     PIP_SALT_VERSION="==${SALT_VERSION}"
 fi
 
 ## Functions
 log_info() {
-    echo "[INFO] $*"
+    echo -e "[INFO] $*"
 }
 
 log_err() {
-    echo "[ERROR] $*" >&2
+    echo -e "[ERROR] $*" >&2
 }
 
 setup_virtualenv() {
     log_info "Setting up Python virtualenv"
+    dependency_check virtualenv
     virtualenv $VENV_DIR
     source ${VENV_DIR}/bin/activate
     python -m pip install salt${PIP_SALT_VERSION}
+    if [[ -f ${CURDIR}/test-requirements.txt ]]; then
+       python -m pip install -r ${CURDIR}/test-requirements.txt
+    fi
 }
 
 setup_mock_bin() {
@@ -65,6 +77,7 @@ setup_salt() {
     [ ! -d ${SALT_FILE_DIR} ] && mkdir -p ${SALT_FILE_DIR}
     [ ! -d ${SALT_CONFIG_DIR} ] && mkdir -p ${SALT_CONFIG_DIR}
     [ ! -d ${SALT_CACHE_DIR} ] && mkdir -p ${SALT_CACHE_DIR}
+    [ ! -d ${SALT_CACHE_EXTMODS_DIR} ] && mkdir -p ${SALT_CACHE_EXTMODS_DIR}
 
     echo "base:" > ${SALT_FILE_DIR}/top.sls
     for pillar in ${PILLARDIR}/*.sls; do
@@ -76,6 +89,7 @@ setup_salt() {
     cat << EOF > ${SALT_CONFIG_DIR}/minion
 file_client: local
 cachedir: ${SALT_CACHE_DIR}
+extension_modules:  ${SALT_CACHE_EXTMODS_DIR}
 verify_env: False
 minion_id_caching: False
 
@@ -83,7 +97,6 @@ file_roots:
   base:
   - ${SALT_FILE_DIR}
   - ${CURDIR}/..
-  - /usr/share/salt-formulas/env
 
 pillar_roots:
   base:
@@ -93,13 +106,14 @@ EOF
 }
 
 fetch_dependency() {
+    # example: fetch_dependency "linux:https://github.com/salt-formulas/salt-formula-linux"
     dep_name="$(echo $1|cut -d : -f 1)"
     dep_source="$(echo $1|cut -d : -f 2-)"
     dep_root="${DEPSDIR}/$(basename $dep_source .git)"
     dep_metadata="${dep_root}/metadata.yml"
 
-    [ -d /usr/share/salt-formulas/env/${dep_name} ] && log_info "Dependency $dep_name already present in system-wide salt env" && return 0
-    [ -d $dep_root ] && log_info "Dependency $dep_name already fetched" && return 0
+    dependency_check git
+    [ -d $dep_root ] && { log_info "Dependency $dep_name already fetched"; return 0; }
 
     log_info "Fetching dependency $dep_name"
     [ ! -d ${DEPSDIR} ] && mkdir -p ${DEPSDIR}
@@ -109,6 +123,19 @@ fetch_dependency() {
     METADATA="${dep_metadata}" install_dependencies
 }
 
+link_modules(){
+    # Link modules *.py files to temporary salt-root
+    local SALT_ROOT=${1:-$SALT_FILE_DIR}
+    local SALT_ENV=${2:-$DEPSDIR}
+
+    mkdir -p "${SALT_ROOT}/_modules/"
+    # from git, development versions
+    find ${SALT_ENV} -maxdepth 3 -mindepth 3 -path '*_modules*' -iname "*.py" -type f -print0 | while read -d $'\0' file; do
+      ln -fs $(readlink -e ${file}) "$SALT_ROOT"/_modules/$(basename ${file}) ;
+    done
+    salt_run saltutil.sync_all
+}
+
 install_dependencies() {
     grep -E "^dependencies:" ${METADATA} >/dev/null || return 0
     (python - | while read dep; do fetch_dependency "$dep"; done) << EOF
@@ -129,13 +156,30 @@ salt_run() {
 }
 
 prepare() {
-    [ -d ${BUILDDIR} ] && mkdir -p ${BUILDDIR}
+    if [[ -f ${BUILDDIR}/.prepare_done ]]; then
+      log_info "${BUILDDIR}/.prepare_done exist, not rebuilding BUILDDIR"
+      return
+    fi
+    [[ -d ${BUILDDIR} ]] && mkdir -p ${BUILDDIR}
 
-    which salt-call || setup_virtualenv
+    [[ ! -f "${VENV_DIR}/bin/activate" ]] && setup_virtualenv
     setup_mock_bin
     setup_pillar
     setup_salt
     install_dependencies
+    link_modules
+    touch ${BUILDDIR}/.prepare_done
+}
+
+lint_releasenotes() {
+    [[ ! -f "${VENV_DIR}/bin/activate" ]] && setup_virtualenv
+    source ${VENV_DIR}/bin/activate
+    reno lint ${CURDIR}/../
+}
+
+lint() {
+#    lint_releasenotes
+    log_err "TODO: lint_releasenotes"
 }
 
 run() {
@@ -152,7 +196,7 @@ run() {
             meta_name=$(basename ${meta})
             echo "Checking meta ${meta_name} ..."
             salt_run --out=quiet --id=${state_name} cp.get_template ${meta} ${SALT_CACHE_DIR}/${meta_name} \
-              || (log_err "Failed to render meta ${meta} using pillar ${FORMULA_NAME}.${state_name}"; exit 1)
+              || { log_err "Failed to render meta ${meta} using pillar ${FORMULA_NAME}.${state_name}"; exit 1; }
             cat ${SALT_CACHE_DIR}/${meta_name}
         done
     done
@@ -161,8 +205,43 @@ run() {
 real_run() {
     for pillar in ${PILLARDIR}/*.sls; do
         state_name=$(basename ${pillar%.sls})
-        salt_run --id=${state_name} state.sls ${FORMULA_NAME} || (log_err "Execution of ${FORMULA_NAME}.${state_name} failed"; exit 1)
+        salt_run --id=${state_name} state.sls ${FORMULA_NAME} || { log_err "Execution of ${FORMULA_NAME}.${state_name} failed"; exit 1; }
+    done
+}
+
+run_model_validate(){
+  # Run modelschema.model_validate validation.
+  # TEST iterateble, run for `each formula ROLE against each ROLE_PILLARNAME`
+  # Pillars should be named in conviend ROLE_XXX.sls or ROLE.sls
+  # Example:
+  # client.sls  client_auth.sls  server.sls  server_auth.sls
+  if [ -d ${SCHEMARDIR} ]; then
+    # model validator require py modules
+    fetch_dependency "salt:https://github.com/salt-formulas/salt-formula-salt"
+    link_modules
+    salt_run saltutil.clear_cache; salt_run saltutil.refresh_pillar; salt_run saltutil.sync_all;
+    for role in ${SCHEMARDIR}/*.yaml; do
+      role_name=$(basename "${role%*.yaml}")
+      for pillar in $(ls pillar/${role_name}*.sls | grep -v ${IGNORE_MODELVALIDATE_MASK} ); do
+        pillar_name=$(basename "${pillar%*.sls}")
+        local _message="FORMULA:${FORMULA_NAME} ROLE:${role_name} against PILLAR:${pillar_name}"
+        log_info "model_validate ${_message}"
+        # Rendered Example:
+        # python $(which salt-call) --local -c /test1/maas/tests/build/salt --id=maas_cluster modelschema.model_validate maas cluster
+        salt_run -m ${DEPSDIR}/salt-formula-salt --id=${pillar_name} modelschema.model_validate ${FORMULA_NAME} ${role_name} || { log_err "Execution of model_validate ${_message} failed"; exit 1 ; }
+      done
     done
+  else
+    log_info "${SCHEMARDIR} not found!";
+  fi
+}
+
+dependency_check() {
+  local DEPENDENCY_COMMANDS=$*
+
+  for DEPENDENCY_COMMAND in $DEPENDENCY_COMMANDS; do
+    which $DEPENDENCY_COMMAND > /dev/null || ( log_err "Command \"$DEPENDENCY_COMMAND\" can not be found in default path."; exit 1; )
+  done
 }
 
 _atexit() {
@@ -187,14 +266,23 @@ case $1 in
     prepare)
         prepare
         ;;
+    lint)
+        lint
+        ;;
     run)
         run
         ;;
     real-run)
         real_run
         ;;
+    model-validate)
+       prepare
+       run_model_validate
+        ;;
     *)
         prepare
+#        lint
         run
+        run_model_validate
         ;;
 esac