diff --git a/makefiles/jjb/help.mk b/makefiles/jjb/help.mk
new file mode 100644
index 0000000..331c68a
--- /dev/null
+++ b/makefiles/jjb/help.mk
@@ -0,0 +1,38 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+# Intent: Helper makefile target used to setup for a release
+# -----------------------------------------------------------------------
+
+## ---------------------------------------------------------------------------
+## Intent: Display supported targets
+## ---------------------------------------------------------------------------
+help-jjb:
+	@echo
+	@echo '[JJB]'
+	@echo '  jjb-gen             Generate a local set of JJB pipelines'
+
+  ifdef VERBOSE
+	@echo '    LOGS=1            Display log from jjb-gen target'
+	@echo '    VERBOSE=1         Display generated pipeline files'
+  endif
+
+## ---------------------------------------------------------------------------
+## ---------------------------------------------------------------------------
+help ::
+	@echo '  help-jjb            Display Jenkins Job Builder targets'
+
+# [EOF]
diff --git a/makefiles/jjb/include.mk b/makefiles/jjb/include.mk
new file mode 100644
index 0000000..7d213b4
--- /dev/null
+++ b/makefiles/jjb/include.mk
@@ -0,0 +1,36 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##--------------------##
+##---]  INCLUDES  [---##
+##--------------------##
+include $(ONF_MAKEDIR)/jjb/help.mk
+include $(ONF_MAKEDIR)/jjb/required.mk
+
+ifdef USE-ONF-JJB-MK
+  # Dynamic loading when targets are requested by name
+  include $(ONF_MAKEDIR)/jjb/targets.mk
+endif
+
+# [EOF]
+
+
diff --git a/makefiles/jjb/required.mk b/makefiles/jjb/required.mk
new file mode 100644
index 0000000..17371e9
--- /dev/null
+++ b/makefiles/jjb/required.mk
@@ -0,0 +1,33 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+# Intent: Conditionally load when named targets are requested.
+#   var ?= $(error ...) definitions are fatal to "make help" and others
+# -----------------------------------------------------------------------
+
+onf-mk-jjb-targets := $(NULL)
+onf-mk-jjb-targets += jjb-gen
+onf-mk-jjb-targets += sterile
+
+# -----------------------------------------------------------------------
+# Define a flag to only load release targets when mentioned by name
+# Makefile can also explicitly define the flag to force always loading.
+# -----------------------------------------------------------------------
+$(foreach tgt,$(onf-mk-jjb-targets),\
+  $(if $(findstring $(tgt),$(MAKECMDGOALS)),$(eval USE-ONF-JJB-MK := true))\
+)
+
+# [EOF]
diff --git a/makefiles/jjb/targets.mk b/makefiles/jjb/targets.mk
new file mode 100644
index 0000000..9778337
--- /dev/null
+++ b/makefiles/jjb/targets.mk
@@ -0,0 +1,71 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+# Intent: Helper makefile target used to setup for a release
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+jjb-gen-dir := build
+# JJB_DEBUG := true
+
+##-------------------##
+##---]  TARGETS  [---##
+##-------------------##
+all: help
+
+## -----------------------------------------------------------------------
+## Intent: Generate pipeline jobs
+## -----------------------------------------------------------------------
+.PHONY: jjb-gen
+
+jjb-gen-args := $(null)
+$(if $(JJB_DEBUG),$(eval jjb-gen-args += --log_level DEBUG))
+
+jjb-gen-log := $(jjb-gen-dir)/jjb-gen.log
+jjb-gen: $(venv-activate-script)
+
+	$(call banner-enter,Target $@)
+	@mkdir -p $(jjb-gen-dir)
+	@touch "$(jjb-gen-dir)/.sentinel"
+	( \
+	  $(activate) \
+	     && jenkins-jobs $(jjb-gen-args) test $(PWD)/jjb -o $(jjb-gen-dir) 3>&1 2>&1 \
+	) | tee "$(jjb-gen-log)"
+
+  ifdef LOGS
+	-@less "$(jjb-gen-log)"
+  endif
+
+  ifdef VERBOSE
+	@echo
+	@echo "** Display generated pipelines"
+	find "$(jjb-gen-dir)" -newer "$(jjb-gen-dir)/.sentinel" -ls
+  endif
+
+	$(call banner-leave,Target $@)
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+sterile ::
+	$(RM) -r $(jjb-gen-dir)
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/doc8/excl.mk b/makefiles/lint/doc8/excl.mk
new file mode 100644
index 0000000..efa71da
--- /dev/null
+++ b/makefiles/lint/doc8/excl.mk
@@ -0,0 +1,48 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2022 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+
+## excl := $(wildcar */*/.git)
+lint-doc8-excl-raw += '$(venv-name)'
+lint-doc8-excl-raw += '*/$(venv-name)'
+$(if $(BUILDDIR),\
+  $(excl lint-doc8-excl-raw += '$(BUILDDIR)'))
+
+# YUCK! -- overhead
+#   o Submodule(s) use individual/variant virtualenv install paths.
+#   o Exclude special snowflakes to enable library makefile use.
+#   o All can use virtualenv.mk for consistent names and cleanup
+#   o [TODO] Ignore submodules, individual repos should check their sources.
+
+lint-doc8-excl-raw += '*/venv_cord'
+lint-doc8-excl-raw += '*/vst_venv'
+
+lint-doc8-excl-raw += './cord-tester'
+lint-doc8-excl-raw += './repos/cord-tester'
+
+lint-doc8-excl-raw += './bbsim/internal/bbsim/responders/sadis/dp.txt'
+lint-doc8-excl-raw += './repos/bbsim/internal/bbsim/responders/sadis/dp.txt'
+lint-doc8-excl-raw += './repos/voltha-helm-charts/voltha-infra/templates/NOTES.txt'
+lint-doc8-excl-raw += './voltha-helm-charts/voltha-infra/templates/NOTES.txt'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/doc8/include.mk b/makefiles/lint/doc8/include.mk
new file mode 100644
index 0000000..56b5e49
--- /dev/null
+++ b/makefiles/lint/doc8/include.mk
@@ -0,0 +1,67 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2022 Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: lint-doc8 lint-doc8-all lint-doc8-modified
+
+have-doc8-files := $(if $(strip $(DOC8_SOURCE)),true)
+DOC8_SOURCE     ?= $(error DOC8_SOURCE= is required)
+
+##--------------------##
+##---]  INCLUDES  [---##
+##--------------------##
+# include $(ONF_MAKEDIR)/lint/doc8/help.mk
+include $(ONF_MAKEDIR)/lint/doc8/install.mk
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+ifndef NO-LINT-DOC8
+  lint-doc8-mode := $(if $(have-doc8-files),modified,all)
+  lint : lint-doc8-$(lint-doc8-mode)
+endif# NO-LINT-DOC8
+
+# Consistent targets across lint makefiles
+lint-doc8-all      : lint-doc8
+lint-doc8-modified : lint-doc8
+
+## -----------------------------------------------------------------------
+## https://github.com/pycqa/doc8
+##   create .config/doc8.ini
+## -----------------------------------------------------------------------
+lint-doc8-excl := $(foreach dir,$(onf-excl-dirs),--ignore-path "$(dir)")
+lint-doc8-excl += --ignore-path $(venv-name)
+lint-doc8: lint-doc8-cmd-version
+
+	$(call banner-enter,Target $@)
+	$(activate) && doc8 --version
+	@echo
+	$(activate) && doc8 $(lint-doc8-excl)
+	$(call banner-leave,Target $@)
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-doc8          Syntax check python using the doc8 command'
+  ifdef VERBOSE
+	@echo '  lint-doc8-all       doc8 checking: exhaustive'
+	@echo '  lint-doc8-modified  doc8 checking: only modified'
+  endif
+
+# [EOF]
diff --git a/makefiles/lint/doc8/install.mk b/makefiles/lint/doc8/install.mk
new file mode 100644
index 0000000..0e62260
--- /dev/null
+++ b/makefiles/lint/doc8/install.mk
@@ -0,0 +1,65 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+## -----------------------------------------------------------------------
+## Intent: Install the doc8 tool
+## -----------------------------------------------------------------------
+.PHONY: lint-doc8-install
+
+## Define a macro to standardize and simplify access
+# DOC8 ?= $(venv-activate-bin)/doc8
+# DOC8 ?= $(activate) && doc8
+
+## -----------------------------------------------------------------------
+## Intent: Display doc8 command version string.
+##   Note: As a side effect, install doc8 by dependency
+## -----------------------------------------------------------------------
+.PHONY: lint-doc8-cmd-version
+lint-doc8-cmd-version : $(venv-activate-bin)/doc8
+
+	$(HIDE) echo
+	$< --version
+
+## -----------------------------------------------------------------------
+## Intent: On-demand instalation of the doc8 command
+## -----------------------------------------------------------------------
+lint-doc8-install := $(venv-activate-bin)/doc8
+$(lint-doc8-install) : $(venv-activate-script)
+
+	$(call banner-enter,Target $@)
+	$(activate) && pip install doc8
+	$(call banner-leave,Target $@)
+
+## -----------------------------------------------------------------------
+## Intent: Purge doc8 tool installation
+## -----------------------------------------------------------------------
+sterile ::
+	$(HIDE)$(RM) "$(venv-abs-bin)/doc8"
+# HIDE)$(RM) -r .venv/lib/*/site-packages/doc8
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-doc8-install       Install the doc8 tool'
+
+# [EOF]
diff --git a/makefiles/lint/groovy/include.mk b/makefiles/lint/groovy/include.mk
index 6baf70c..5959fe0 100644
--- a/makefiles/lint/groovy/include.mk
+++ b/makefiles/lint/groovy/include.mk
@@ -34,18 +34,52 @@
 endif
 
 ## -----------------------------------------------------------------------
+## All or on-demand
+##   make lint-groovy BY_SRC="a/b/c.groovy d/e/f.groovy"
+## -----------------------------------------------------------------------
+ifdef LINT_SRC
+  lint-groovy : lint-groovy-src
+else
+  lint-groovy : lint-groovy-all
+endif
+
+## -----------------------------------------------------------------------
 ## Intent: Perform a lint check on command line script sources
 ## -----------------------------------------------------------------------
-lint-groovy:
+lint-groovy-all:
 	$(groovy-check) --version
 	@echo
 	$(HIDE)$(env-clean) find . -iname '*.groovy' -print0 \
   | $(xargs-n1) $(groovy-check) $(groovy-check-args)
 
 ## -----------------------------------------------------------------------
+## Intent: Perform lint check on a named list of files
+## -----------------------------------------------------------------------
+BY_SRC ?= $(error $(MAKE) $@ BY_SRC= is required)
+lint-groovy-src:
+	$(groovy-check) --version
+	@echo
+#	$(foreach fyl,$(BY_SRC),$(groovy-check) $(groovy-check-args) $(fyl))
+	$(groovy-check) $(groovy-check-args) $(BY_SRC)
+
+## -----------------------------------------------------------------------
+## Intent: Perform lint check on a named list of files
+## -----------------------------------------------------------------------
+BYGIT = $(shell git diff --name-only HEAD | grep '\.groovy')
+lint-groovy-mod:
+	$(groovy-check) --version
+	@echo
+	$(foreach fyl,$(BYGIT),$(groovy-check) $(groovy-check-args) $(fyl))
+
+## -----------------------------------------------------------------------
 ## Intent: Display command help
 ## -----------------------------------------------------------------------
 help-summary ::
-	@echo '  lint-groovy          Syntax check groovy sources'
-
+	@echo '  lint-groovy          Conditionally lint groovy source'
+	@echo '      BY_SRC=a/b/c.groovy d/e/f.groovy'
+  ifdef VERBOSE
+	@echo '  lint-groovy-all    Lint all available sources'
+	@echo '  lint-groovy-mod    Lint locally modified (git status)'
+	@echo '  lint-groovy-src    Lint individually (BY_SRC=list-of-files)'
+  endif
 # [EOF]
diff --git a/makefiles/lint/groovy/install.mk b/makefiles/lint/groovy/install.mk
new file mode 100644
index 0000000..fcfa8d6
--- /dev/null
+++ b/makefiles/lint/groovy/install.mk
@@ -0,0 +1,49 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+lint-groovy-cmds += $(shell which npm-groovy-lint)
+lint-groovy-cmds += $(HOME)/.npm/bin/npm-groovy-lint
+lint-groovy-cmds += /usr/bin/npm-groovy-lint
+# lint-groovy-cmds += /dev/null#                     # force existence
+
+lint-groovy-cmd = $(firstword $(wildcard $(lint-groovy-cmds)))
+
+##-------------------##
+##---]  TARGETS  [---##
+##-------------------##
+ifndef NO-LINT-GROOVY
+
+  lint : lint-groovy
+endif
+
+## -----------------------------------------------------------------------
+## Intent: Install npm-groovy-lint
+## -----------------------------------------------------------------------
+$(lint-groovy-cmd) : lint-groovy-install
+lint-groovy-install:
+
+## -----------------------------------------------------------------------
+## Intent: Display command help
+## -----------------------------------------------------------------------
+help-summary ::
+	@echo '  lint-groovy-install          Syntax check groovy sources'
+
+# [EOF]
+
diff --git a/makefiles/lint/groovy/urls b/makefiles/lint/groovy/urls
index aa5c5eb..4d9ba27 100644
--- a/makefiles/lint/groovy/urls
+++ b/makefiles/lint/groovy/urls
@@ -5,4 +5,7 @@
 
 https://github.com/nvuillam/npm-groovy-lint
 
+# Homepage
+installhttps://nvuillam.github.io/npm-groovy-lint/
+
 # [EOF]
diff --git a/makefiles/lint/include.mk b/makefiles/lint/include.mk
index 4cb5b39..be19569 100644
--- a/makefiles/lint/include.mk
+++ b/makefiles/lint/include.mk
@@ -42,7 +42,7 @@
 include $(ONF_MAKEDIR)/lint/python/include.mk
 include $(ONF_MAKEDIR)/lint/shell.mk
 include $(ONF_MAKEDIR)/lint/tox/include.mk
-include $(ONF_MAKEDIR)/lint/yaml.mk
+include $(ONF_MAKEDIR)/lint/yaml/include.mk
 
 include $(ONF_MAKEDIR)/lint/help.mk
 
diff --git a/makefiles/lint/python.mk b/makefiles/lint/python.mk
new file mode 100644
index 0000000..d3fe4fd
--- /dev/null
+++ b/makefiles/lint/python.mk
@@ -0,0 +1,53 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+
+# Gather sources to check
+# TODO: implement deps, only check modified files
+python-check-find := find . -name '*venv*' -prune\
+  -o \( -name '*.py' \)\
+  -type f -print0
+
+# python-check    := $(env-clean) pylint
+python-check    := pylint
+
+# python-check-args += --dry-run
+
+##-------------------##
+##---]  TARGETS  [---##
+##-------------------##
+ifndef NO-LINT-PYTHON
+  lint : lint-python
+endif
+
+## -----------------------------------------------------------------------
+## Intent: Perform a lint check on makefile sources
+## -----------------------------------------------------------------------
+lint-python:
+	$(HIDE)$(env-clean) $(python-check-find) \
+	    | $(xargs-n1) $(python-check) $(python-check-args)
+
+## -----------------------------------------------------------------------
+## Intent: Display command help
+## -----------------------------------------------------------------------
+help-summary ::
+	@echo '  lint-python         Syntax check python sources (*.py)'
+
+# [EOF]
diff --git a/makefiles/lint/shell.mk b/makefiles/lint/shell.mk
index 3c33bb2..b1a083b 100644
--- a/makefiles/lint/shell.mk
+++ b/makefiles/lint/shell.mk
@@ -14,9 +14,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 # -----------------------------------------------------------------------
-# https://gerrit.opencord.org/plugins/gitiles/onf-make
-# ONF.makefile.version = 1.0
-# -----------------------------------------------------------------------
 
 ##-------------------##
 ##---]  GLOBALS  [---##
@@ -30,11 +27,10 @@
 shell-check-find += -o \( -name '*.sh' \)
 shell-check-find += -type f -print0
 
-shell-check    := $(env-clean) shellcheck
-# shell-check      := shellcheck
+# shell-check    := $(env-clean) pylint
+shell-check      := shellcheck
 
-shell-check-args += --check-sourced
-shell-check-args += --external-sources
+shell-check-args += -a
 
 ##-------------------##
 ##---]  TARGETS  [---##
@@ -58,8 +54,4 @@
 help-summary ::
 	@echo '  lint-shell          Syntax check shell sources'
 
-# [SEE ALSO]
-# -----------------------------------------------------------------------
-#   o https://www.shellcheck.net/wiki/Directive
-
 # [EOF]
diff --git a/makefiles/lint/tox/include.mk b/makefiles/lint/tox/include.mk
new file mode 100644
index 0000000..7d7cf3e
--- /dev/null
+++ b/makefiles/lint/tox/include.mk
@@ -0,0 +1,27 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+include $(ONF_MAKEDIR)/lint/tox/tox.mk
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/tox/tox.mk b/makefiles/lint/tox/tox.mk
new file mode 100644
index 0000000..35cec00
--- /dev/null
+++ b/makefiles/lint/tox/tox.mk
@@ -0,0 +1,91 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: lint-tox lint-tox-all lint-tox-modified
+
+PYTHON_FILES      ?= $(error PYTHON_FILES= required)
+
+## -----------------------------------------------------------------------
+## Intent: Sanity check incoming JJB config changes.
+##   Todo: Depend on makefiles/lint/jjb.mk :: lint-jjb
+## -----------------------------------------------------------------------
+ifndef NO-LINT-TOX
+  lint-tox-mode := $(if $(have-python-files),modified,all)
+  lint     : lint-tox
+  lint-tox : lint-tox-$(lint-tox-mode)
+endif# NO-LINT-TOX
+
+## -----------------------------------------------------------------------
+## Intent: Invoke tox on all sources
+## -----------------------------------------------------------------------
+lint-tox-all: $(venv-activate-script)
+	$(MAKE) --no-print-directory lint-tox-install
+
+	$(activate) && tox -e py310
+
+## -----------------------------------------------------------------------
+## Intent: Invoke tox on modified sources (target is mainly for consistency)
+## -----------------------------------------------------------------------
+lint-tox-modified: $(venv-activate-script)
+	$(MAKE) --no-print-directory lint-tox-install
+
+	$(activate) && tox -e py310 $(PYTHON_FILES)
+
+## -----------------------------------------------------------------------
+## Intent: https://tox.wiki/en/4.6.4/installation.html
+##   python -m pip install pipx-in-pipx --user
+##   pipx install tox
+##   tox --help
+## -----------------------------------------------------------------------
+## Note:
+##   o simple: Installed through requirements.txt
+##   o This target can make usage on-demand.
+## -----------------------------------------------------------------------
+.PHONY: lint-tox-install
+lint-tox-install: $(venv-activate-script)
+	@echo
+	@echo "** -----------------------------------------------------------------------"
+	@echo "** python tox syntax checking"
+	@echo "** -----------------------------------------------------------------------"
+	$(activate) && pip install --upgrade tox
+	$(activate) && tox --version
+	@echo
+
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-tox             Invoke the tox test command'
+  ifdef VERBOSE
+	@echo '  $(MAKE) lint-tox PYTHON_FILES=...'
+	@echo '  lint-tox-modified  tox checking: only modified'
+	@echo '  lint-tox-all       tox checking: exhaustive'
+	@echo '  lint-tox-install     Install the tox command'
+  endif
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/yaml/.yamllint b/makefiles/lint/yaml/.yamllint
new file mode 100644
index 0000000..c42c6d5
--- /dev/null
+++ b/makefiles/lint/yaml/.yamllint
@@ -0,0 +1,45 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+---
+
+yaml-files:
+  - '*.yaml'
+  - '*.yml'
+  - '.yamllint'
+
+rules:
+  document-start: disable
+  line-length:
+    max: 160
+
+# -----------------------------------------------------------------------
+# .. seealso: https://gerrit.opencord.org/plugins/gitiles/helm-repo-tools/+/refs/heads/master/yamllint.conf
+# -----------------------------------------------------------------------
+#
+# extends: default
+#
+#rules:
+#  empty-lines:
+#    max-end: 1
+#  line-length:
+#    max: 120
+#  braces:
+#    min-spaces-inside: 0
+#    max-spaces-inside: 1
diff --git a/makefiles/lint/yaml/byrepo/ci-management/yamllint.conf b/makefiles/lint/yaml/byrepo/ci-management/yamllint.conf
new file mode 100644
index 0000000..32d76ab
--- /dev/null
+++ b/makefiles/lint/yaml/byrepo/ci-management/yamllint.conf
@@ -0,0 +1,8 @@
+extends: default
+
+rules:
+  empty-lines:
+    max-end: 1
+  line-length:
+    max: 120
+
diff --git a/makefiles/lint/yaml/byrepo/voltha-lib-go/include.mk b/makefiles/lint/yaml/byrepo/voltha-lib-go/include.mk
new file mode 100644
index 0000000..6cbd0ea
--- /dev/null
+++ b/makefiles/lint/yaml/byrepo/voltha-lib-go/include.mk
@@ -0,0 +1,27 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##--------------------##
+##---]  INCLUDES  [---##
+##--------------------##
+include $(ONF_MAKEDIR)/lint/yaml/byrepo/$(--repo-name--)/yamllint.mk
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/yaml/byrepo/voltha-lib-go/python.mk b/makefiles/lint/yaml/byrepo/voltha-lib-go/python.mk
new file mode 100644
index 0000000..cf0eef5
--- /dev/null
+++ b/makefiles/lint/yaml/byrepo/voltha-lib-go/python.mk
@@ -0,0 +1,41 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+YAML_FILES ?= $(error YAML_FILES= is required)
+
+lint-yaml-dep = $(addsuffix ^lint-yaml,$(YAML_FILES))
+lint-yaml-src = $(firstword $(subst ^,$(space),$(1)))
+
+##-------------------##
+##---]  TARGETS  [---##
+##-------------------##
+.PHONY : lint-yaml
+lint   : lint-yaml
+
+lint-yaml: $(venv-activate)
+lint-yaml: $(lint-yaml-dep)
+
+$(lint-yaml-dep):
+	$(vst-env) && yamllint -s $(call lint-yaml-src,$@)
+
+help::
+	@echo "  lint-yaml            Syntax check yaml sources"
+
+# [EOF]
diff --git a/makefiles/lint/yaml/byrepo/voltha-lib-go/repo b/makefiles/lint/yaml/byrepo/voltha-lib-go/repo
new file mode 100644
index 0000000..99e8451
--- /dev/null
+++ b/makefiles/lint/yaml/byrepo/voltha-lib-go/repo
@@ -0,0 +1 @@
+Source from voltha-lib-go
\ No newline at end of file
diff --git a/makefiles/lint/yaml/byrepo/voltha-lib-go/todo b/makefiles/lint/yaml/byrepo/voltha-lib-go/todo
new file mode 100644
index 0000000..8400c64
--- /dev/null
+++ b/makefiles/lint/yaml/byrepo/voltha-lib-go/todo
@@ -0,0 +1,39 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+# -----------------------------------------------------------------------
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+env-clean = /usr/bin/env --ignore-environment
+xargs-n1      := xargs -0 -t -n1 --no-run-if-empty
+
+yamllint      := $(env-clean) $(YAMLLINT)
+yamllint-args := -c .yamllint
+
+##-------------------##
+##---]  TARGETS  [---##
+##-------------------##
+lint : lint-yaml
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+lint-yaml:
+	$(HIDE)$(env-clean) find . -name '*.yaml' -type f -print0 \
+	    | $(xargs-n1) $(yamllint) $(yamllint-args)
+
+## -----------------------------------------------------------------------
+## -----------------------------------------------------------------------
+help:
+	@echo
+	@echo "USAGE: $(MAKE)"
+	@echo "  lint        perform syntax checks on source"
+	@echo "  test        perform syntax checks on source"
+	@echo "  pre-check   Verify tools and deps are available for testing"
+	@echo
+	@echo "[LINT]"
+	@echo "  lint-json   Syntax check .json sources"
+	@echo "  lint-yaml   Syntax check .yaml sources"
+	@echo
+# [EOF]
diff --git a/makefiles/lint/yaml/byrepo/voltha-lib-go/urls b/makefiles/lint/yaml/byrepo/voltha-lib-go/urls
new file mode 100644
index 0000000..8747658
--- /dev/null
+++ b/makefiles/lint/yaml/byrepo/voltha-lib-go/urls
@@ -0,0 +1,5 @@
+# -*- makefile -*-
+
+https://yamllint.readthedocs.io/en/stable/configuration.html
+
+# [EOF]
\ No newline at end of file
diff --git a/makefiles/lint/yaml/byrepo/voltha-lib-go/yamllint.helm b/makefiles/lint/yaml/byrepo/voltha-lib-go/yamllint.helm
new file mode 100644
index 0000000..bf1d2b9
--- /dev/null
+++ b/makefiles/lint/yaml/byrepo/voltha-lib-go/yamllint.helm
@@ -0,0 +1,32 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+---
+# yamllint.conf
+
+extends: default
+
+rules:
+  empty-lines:
+    max-end: 1
+  line-length:
+    max: 120
+  braces:
+    min-spaces-inside: 0
+    max-spaces-inside: 1
diff --git a/makefiles/lint/yaml/byrepo/voltha-lib-go/yamllint.mk b/makefiles/lint/yaml/byrepo/voltha-lib-go/yamllint.mk
new file mode 100644
index 0000000..fb56e3a
--- /dev/null
+++ b/makefiles/lint/yaml/byrepo/voltha-lib-go/yamllint.mk
@@ -0,0 +1,72 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+--onf-mk-lint-yaml-- := true#       # Inhibit loading downstream lint-yaml targets
+
+# yamllint      := $(env-clean) yamllint
+# yamllint      := $(activate) && yamllint
+
+YAMLLINT = $(activate) && yamllint
+
+## -------------------------------
+## Add requirement(s) for checking
+## -------------------------------
+yamllint-cfg  := yamllint.helm
+yamllint-conf = $(wildcard $(yamllint-cfg) $(ONF_MAKEDIR)/lint/yaml/$(yamllint-cfg))
+yamllint-args += $(addprefix --config-file$(space),$(yamllint-conf))
+yamllint-args += --strict
+
+## -----------------------------------------------------------------------
+## Intent: Use the yaml command to perform syntax checking.
+## -----------------------------------------------------------------------
+ifndef NO-LINT-YAML
+  # lint-yaml-mode := $(if $(have-yaml-files),modified,all)
+  lint      : lint-yaml
+  lint-yaml : lint-yaml-votlha-lib-go
+#  lint-yaml : lint-yaml-all-votlha-lib-go-$(lint-yaml-mode)
+endif# NO-LINT-YAML
+
+## -----------------------------------------------------------------------
+## ----------------------------------------------------------------------
+lint-yaml-votlha-lib-go: lint-yaml-cmd-version
+
+	$(call banner-enter,Target $@)
+	$(HIDE)$(MAKE) --no-print-directory lint-yaml-install
+
+	$(HIDE)$(env-clean) $(call gen-yaml-find-cmd) \
+	    | $(env-clean) $(xargs-cmd) -I'{}' \
+		bash -c "$(YAMLLINT) $(yamllint-args) {}"
+	$(call banner-leave,Target $@)
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+  # lint-yaml help already displayed by lint/yaml/help.mk
+  ifdef VERBOSE
+	@echo '  $(MAKE) lint-yaml YAML_FILES=...'
+	@echo '  lint-yaml-votlha-lib-go   lint-yaml for repo:voltha-lib-go'
+  endif
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/yaml/find_utils.mk b/makefiles/lint/yaml/find_utils.mk
new file mode 100644
index 0000000..49d4cb0
--- /dev/null
+++ b/makefiles/lint/yaml/find_utils.mk
@@ -0,0 +1,32 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Intent:
+#   o Construct a find command able to gather python files with filtering.
+#   o Used by library makefiles flake8.mk and pylint.mk for iteration.
+# -----------------------------------------------------------------------
+
+## -----------------------------------------------------------------------
+## Intent: Construct a string for invoking find \( excl-pattern \) -prune
+# -----------------------------------------------------------------------
+gen-yaml-find-excl = \
+  $(strip \
+	-name '__ignored__' \
+	$(foreach dir,$($(1)),-o -name $(dir)) \
+  )
+
+## -----------------------------------------------------------------------
+## Intent: Construct a find command to gather a list of python files
+##         with exclusions.
+## -----------------------------------------------------------------------
+## Usage:
+#	$(activate) & $(call gen-python-find-cmd) | $(args-n1) pylint
+## -----------------------------------------------------------------------
+gen-yaml-find-cmd = \
+  $(strip \
+    find . \
+      \( $(call gen-yaml-find-excl,onf-excl-dirs) \) -prune \
+      -o \( -iname '*.yaml' -o -iname '*.yml' \) \
+      -print0 \
+  )
+
+# [EOF]
diff --git a/makefiles/lint/yaml/help.mk b/makefiles/lint/yaml/help.mk
new file mode 100644
index 0000000..ef8621e
--- /dev/null
+++ b/makefiles/lint/yaml/help.mk
@@ -0,0 +1,41 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+## ---------------------------------------------------------------------------
+## Intent: Display a help banner early so includes below that also define
+##         help targets will be displayed beneath a high level banner.
+## ---------------------------------------------------------------------------
+help ::
+  ifndef VERBOSE
+	@echo '  lint-yaml          Invoke all yaml linting targets'
+  else
+	$(HIDE)$(MAKE) --no-print-directory help-lint-yaml
+  endif
+
+## ---------------------------------------------------------------------------
+## Intent: Display extended target help
+## ---------------------------------------------------------------------------
+help-lint-yaml:
+	@echo
+	@echo '[LINT: yaml]   (make lint-yaml VERBOSE=1)'
+	@echo '  lint-yaml          Invoke all yaml linting targets'
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/lint/yaml/include.mk b/makefiles/lint/yaml/include.mk
new file mode 100644
index 0000000..26c4a7f
--- /dev/null
+++ b/makefiles/lint/yaml/include.mk
@@ -0,0 +1,42 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+ifndef --onf-mk-lint-yaml--
+
+$(if $(DEBUG),$(warning ENTER))
+
+##--------------------##
+##---]  INCLUDES  [---##
+##--------------------##
+include $(ONF_MAKEDIR)/lint/yaml/help.mk
+include $(ONF_MAKEDIR)/lint/yaml/find_utils.mk
+include $(ONF_MAKEDIR)/lint/yaml/install.mk
+
+# [TODO] Consolidate and refactor to support a simpler answer
+# Special snowflake linting requirements
+-include $(ONF_MAKEDIR)/lint/yaml/byrepo/$(--repo-name--)/include.mk
+
+# Standard lint-yaml targets
+include $(ONF_MAKEDIR)/lint/yaml/yamllint.mk
+
+--onf-mk-lint-yaml-- := true#        # Flag to inhibit re-including
+
+$(if $(DEBUG),$(warning LEAVE))
+
+endif # --onf-mk-lint-yaml--
+
+# [EOF]
diff --git a/makefiles/lint/yaml/install.mk b/makefiles/lint/yaml/install.mk
new file mode 100644
index 0000000..62b777d
--- /dev/null
+++ b/makefiles/lint/yaml/install.mk
@@ -0,0 +1,73 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2022-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-FileCopyrightText: 2022 Open Networking Foundation (ONF) and the ONF Contributors
+# SPDX-License-Identifier: Apache-2.0
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+## -----------------------------------------------------------------------
+## Intent: Install the yamllint tool
+## -----------------------------------------------------------------------
+.PHONY: lint-yaml-install
+
+# -----------------------------------------------------------------------
+# We can(/should?) define a command macro
+# wait a bit until use cases are better known.
+# Initial use required inserting xargs bash -c "$(YAMLLINT) {}"
+# -----------------------------------------------------------------------
+# YAMLLINT ?= $(venv-activate-bin)/yamllint
+# YAMLLINT ?= $(activate) && yamllint
+
+## -----------------------------------------------------------------------
+## Intent: Display yamllint command version string.
+##   Note: As a side effect, install yamllint by dependency
+## -----------------------------------------------------------------------
+.PHONY: lint-yaml-cmd-version
+lint-yaml-cmd-version : $(venv-activate-bin)/yamllint
+
+	$(HIDE) echo
+	$< --version
+
+## -----------------------------------------------------------------------
+## Intent: On-demand instalation of the yamllint command
+## -----------------------------------------------------------------------
+lint-yaml-install := $(venv-activate-bin)/yamllint
+$(lint-yaml-install) : $(venv-activate-script)
+
+	$(call banner-enter,Target $@)
+	$(activate) && pip install yamllint
+	$(call banner-leave,Target $@)
+
+## -----------------------------------------------------------------------
+## Intent: Purge yamllint tool installation
+## -----------------------------------------------------------------------
+sterile ::
+	$(HIDE)$(RM) "$(venv-abs-bin)/yamllint"
+	$(HIDE)$(RM) -r .venv/lib/*/site-packages/yamllint
+
+        # Remove both file:command and dir:libraries
+        # find "$(venv-abs-path)" -iname 'yamllint' -print0 \
+        #    | $(xargs-n1-clean) $(RM) -r {}
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-yaml-install       Install the yamllint tool'
+
+# [EOF]
diff --git a/makefiles/lint/yaml/yamllint.mk b/makefiles/lint/yaml/yamllint.mk
new file mode 100644
index 0000000..1563c7c
--- /dev/null
+++ b/makefiles/lint/yaml/yamllint.mk
@@ -0,0 +1,78 @@
+# -*- makefile -*-
+# -----------------------------------------------------------------------
+# Copyright 2017-2023 Open Networking Foundation (ONF) and the ONF Contributors
+#
+# Licensed under the Apache License, Version 2.0 (the "License")
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+# -----------------------------------------------------------------------
+
+$(if $(DEBUG),$(warning ENTER))
+
+##-------------------##
+##---]  GLOBALS  [---##
+##-------------------##
+.PHONY: lint-yaml lint-yaml-all lint-yaml-modified
+
+have-yaml-files := $(if $(strip $(YAML_FILES)),true)
+YAML_FILES      ?= $(error YAML_FILES= is required)
+
+YAMLLINT = $(activate) && yamllint
+yamllint-args += --strict
+
+## -----------------------------------------------------------------------
+## Intent: Use the yaml command to perform syntax checking.
+## -----------------------------------------------------------------------
+ifndef NO-LINT-YAML
+  lint-yaml-mode := $(if $(have-yaml-files),modified,all)
+  lint      : lint-yaml
+  lint-yaml : lint-yaml-$(lint-yaml-mode)
+endif# NO-LINT-YAML
+
+## -----------------------------------------------------------------------
+## Intent: exhaustive yaml syntax checking
+## -----------------------------------------------------------------------
+lint-yaml-all: lint-yaml-cmd-version
+
+	$(call banner-enter,Target $@)
+	$(HIDE)$(MAKE) --no-print-directory lint-yaml-install
+	$(HIDE)$(activate) && $(call gen-yaml-find-cmd) \
+	    | $(env-clean) $(xargs-cmd) -I'{}' \
+		bash -c "$(YAMLLINT) $(yamllint-args) {}"
+	$(call banner-leave,Target $@)
+
+## -----------------------------------------------------------------------
+## Intent: check deps for format and python3 cleanliness
+## Note:
+##   yaml --py3k option no longer supported
+## -----------------------------------------------------------------------
+lint-yaml-modified: lint-yaml-cmd-version
+
+	$(call banner-enter,Target $@)
+	$(HIDE)$(MAKE) --no-print-directory lint-yaml-install
+	$(YAMLLINT) $(yamllint-args) $(YAML_FILES)
+	$(call banner-leave,Target $@)
+
+## -----------------------------------------------------------------------
+## Intent: Display command usage
+## -----------------------------------------------------------------------
+help::
+	@echo '  lint-yaml          Syntax check python using the yaml command'
+  ifdef VERBOSE
+	@echo '  $(MAKE) lint-yaml YAML_FILES=...'
+	@echo '  lint-yaml-all       yaml checking: exhaustive'
+	@echo '  lint-yaml-modified  yaml checking: only locally modified'
+	@echo '  lint-yaml-install   Install the pylint command'
+  endif
+
+$(if $(DEBUG),$(warning LEAVE))
+
+# [EOF]
diff --git a/makefiles/virtualenv.mk b/makefiles/virtualenv.mk
index c6904da..cf24024 100644
--- a/makefiles/virtualenv.mk
+++ b/makefiles/virtualenv.mk
@@ -15,7 +15,7 @@
 # limitations under the License.
 # -----------------------------------------------------------------------
 # https://gerrit.opencord.org/plugins/gitiles/onf-make
-# ONF.makefile.version = 1.0
+# ONF.makefile.version = 1.2
 # -----------------------------------------------------------------------
 
 $(if $(DEBUG),$(warning ENTER))
@@ -30,8 +30,8 @@
 ##------------------##
 venv-name            ?= .venv#                            # default install directory
 venv-abs-path        := $(PWD)/$(venv-name)
-
-venv-activate-script := $(venv-name)/bin/activate#        # dependency
+venv-activate-bin    := $(venv-name)/bin
+venv-activate-script := $(venv-activate-bin)/activate#    # dependency
 
 # Intent: activate= is a macro for accessing the virtualenv activation script#
 #  Usage: $(activate) && python
@@ -51,7 +51,10 @@
 	virtualenv -p python3 $(venv-name)
 	$(activate) && python -m pip install --upgrade pip
 	$(activate) && pip install --upgrade setuptools
-	$(activate) && { [[ -r requirements.txt ]] && python -m pip install -r requirements.txt; }
+	$(activate) && [[ -r requirements.txt ]] \
+	    && { python -m pip install -r requirements.txt; } \
+	    || { /bin/true; }
+
 	$(activate) && python --version
 
 ## -----------------------------------------------------------------------