healthchecks: start to implement container healthchecks

This is the first in a series of patches that will implement
healthchecks for containerized services, conforming to the Docker
HEALTHCHECK api and to the container-healthchecks blueprint.  This
commit includes an example healtcheck (for heat-api), and modifies the
pep8 check to error out on duplicate jinja blocks in
container-images/tripleo_kolla_template_overrides.j2, since we will be
adding or modifying the _footer block for each service.

Change-Id: Id9fc19dd386e395317093d1723b836ae2807fdf0
Implements: blueprint container-healthchecks
Co-authored-by: Dan Prince <dprince@redhat.com>
Co-authored-by: Ian Main <imain@redhat.com>

container-images/tripleo_kolla_template_overrides.j2

@@ -8,7 +8,7 @@
 # This installs the puppet dependency in the base container and includes helper scripts
 # Rsync is required for docker-puppet.py to move the generated config to /var/lib/config-data
 # Cron is required by multiple services
-{% set base_centos_binary_packages_append = ['openstack-tripleo-common-container-base', 'rsync', 'cronie'] %}
+{% set base_centos_binary_packages_append = ['openstack-tripleo-common-container-base', 'rsync', 'cronie', 'crudini'] %}
 {% set nova_scheduler_packages_append = ['openstack-tripleo-common'] %}
 
 # Required for mistral-db-populate to load tripleo custom actions on

healthcheck/heat-api

@@ -0,0 +1,5 @@
+#!/bin/sh
+
+bind_host=$(crudini --get /etc/heat/heat.conf heat_api bind_host 2> /dev/null || echo 127.0.0.1)
+bind_port=$(crudini --get /etc/heat/heat.conf heat_api bind_port 2> /dev/null || echo 8004)
+curl --fail http://${bind_host}:${bind_port}/ || exit 1

setup.cfg

@@ -39,6 +39,7 @@ data_files =
     share/tripleo-common/container-images = container-images/*
     share/tripleo-common/image-yaml = image-yaml/*
     share/tripleo-common/workbooks = workbooks/*
+    share/tripleo-common/healthcheck = healthcheck/*
 
 [build_sphinx]
 source-dir = doc/source

tools/check_duplicate_jinja_blocks.sh

@@ -0,0 +1,21 @@
+#!/bin/sh
+
+myname=${0##*/}
+path=container-images/tripleo_kolla_template_overrides.j2
+
+grep '{% block' $path |
+sort |
+uniq -c |
+awk -v myname=$myname '
+	$1 == 2 {
+		printf "%s: found duplicate block for %s\n", myname, $4
+		retval=1
+	}
+
+	END {exit retval}
+'
+
+if [ $? -ne 0 ]; then
+	echo "$myname: duplicate jinja block declarations found in $path" >&2
+	exit 1
+fi

tox.ini

@@ -12,9 +12,11 @@ setenv =
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = python setup.py test --slowest --testr-args='{posargs}'
+whitelist_externals = bash
 
 [testenv:pep8]
 commands = flake8
+           bash -c tools/check_duplicate_jinja_blocks.sh
 
 [testenv:venv]
 commands = {posargs}