Add a doc describing a quick live environment
Discussion in IRC suggested that https://anticdent.org/quick-placement-development.html ought to do in the contributor docs, so here is a version of it, translated from Markdown to RST. Change-Id: I7a014e96d2f4c01594d977c5a4af9894278dd511
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Chris Dent
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@ -366,8 +366,10 @@ examples. Gabbi can provide a useful way of doing test driven development of a
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new handler: create a YAML file that describes the desired URLs and behavior
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and write the code to make it pass.
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It is also possible to use gabbi against a running placement service, for
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example in devstack. See `gabbi-run`_ to get started.
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It's also possible to use gabbi against a running placement service, for
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example in devstack. See `gabbi-run`_ to get started. If you don't want to
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go to the trouble of using devstack, but do want a live server see
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:doc:`quick-dev`.
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Database Schema Changes
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=======================
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@ -0,0 +1,196 @@
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..
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Licensed under the Apache License, Version 2.0 (the "License"); you may
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not use this file except in compliance with the License. You may obtain
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a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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License for the specific language governing permissions and limitations
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under the License.
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===========================
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Quick Placement Development
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===========================
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.. note:: This is one of many ways to achieve a simple *live* development
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enviroment for the placement service. This isn't meant to be the
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best way, or the only way. Its purpose is more to demonstrate the
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steps involved, so that people can learn from those steps and choose
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to assemble them in whatever ways work best for them.
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This content was originally written in a `blog post
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<https://anticdent.org/quick-placement-development.html>`_, which
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perhaps explains its folksy tone.
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Here are some instructions on how to spin up the placement wsgi script with
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uwsgi and a stubbed out ``placement.conf``, in case you want to see what
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happens. The idea here is that you want to experiment with the current
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placement code, using a live database, but you're not concerned with other
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services, don't want to deal with devstack, but need a level of interaction
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with the code and process that something like `placedock
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<https://github.com/cdent/placedock>`_ can't provide.
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*As ever, even all of the above has lots of assumptions about experience and
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context. This document assumes you are someone who either is an OpenStack (and
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probably placement) developer, or would like to be one.*
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To make this go you need a unix-like OS, with a python3 dev environment, and
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git and mysql (or postgresql) installed. We'll be doing this work from within a
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virtualenv, built from the ``tox.ini`` in the placement code.
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Get The Code
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============
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The placement code lives at
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https://git.openstack.org/cgit/openstack/placement . We want to clone that::
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git clone git://git.openstack.org/openstack/placement
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cd placement
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Setup The Database
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==================
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We need to 1) create the database, 2) create a virtualenv to have the command,
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3) use it to create the tables.
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The database can have whatever name you like. Whatever you choose, use it
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throughout this process. We choose ``placement``. You may need a user and
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password to talk to your database, setting that up is out of scope for this
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document::
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mysql -uroot -psecret -e "DROP DATABASE IF EXISTS placement;"
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mysql -uroot -psecret -e "CREATE DATABASE placement CHARACTER SET utf8;"
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You may also need to set permissions::
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mysql -uroot -psecret \
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-e "GRANT ALL PRIVILEGES ON placement.* TO 'root'@'%' identified by 'secret';"
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Create a bare minimum placement.conf in the ``/etc/placement``
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directory (which you may need to create)::
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[placement_database]
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connection = mysql+pymysql://root:secret@127.0.0.1/placement?charset=utf8
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.. note:: You may choose the location of the configuration file on the command
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line when using the ``placement-manage`` command.
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Make the ``placement-manage`` command available by updating a virtualenv::
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tox -epy36 --notest
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Run the command to create the tables::
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.tox/py36/bin/placement-manage db sync
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You can confirm the tables are there with ``mysqlshow placement``
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Run The Service
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===============
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Now we want to run the service. We need to update ``placement.conf`` so it will
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produce debugging output and use the ``noauth`` strategy for authentication (so
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we don't also have to run Keystone). Make ``placement.conf`` look like this
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(adjusting for your database settings)::
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[DEFAULT]
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debug = True
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[placement_database]
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connection = mysql+pymysql://root:secret@127.0.0.1/placement?charset=utf8
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[api]
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auth_strategy = noauth2
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We need to install the uwsgi package into the virtualenv::
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.tox/py36/bin/pip install uwsgi
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And then use uwsgi to run the service. Start it with::
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.tox/py36/bin/uwsgi --http :8000 --wsgi-file .tox/py36/bin/placement-api --processes 2 --threads 10
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.. note:: Adjust ``processes`` and ``threads`` as required. If you do not
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provide these arguments the server will be a single process and
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thus perform poorly.
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If that worked you'll see lots of debug output and ``spawned uWSGI worker``.
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Test that things are working from another terminal with curl::
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curl -v http://localhost:8000/
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Get a list of resource providers with (the ``x-auth-token`` header is
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required, ``openstack-api-version`` is optional but makes sure we are getting
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the latest functionality)::
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curl -H 'x-auth-token: admin' \
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-H 'openstack-api-version: placement latest' \
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http://localhost:8000/resource_providers
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The result ought to look something like this::
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{"resource_providers": []}
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If it doesn't then something went wrong with the above and there should be more
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information in the terminal where ``uwsgi`` is running.
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From here you can experiment with creating resource providers and related
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placement features. If you change the placement code, ``ctrl-c`` to kill the
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uwsgi process and start it up again. For testing, you might enjoy
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`placecat <https://github.com/cdent/placecat>`_.
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Here's all of the above as single script. As stated above this is for
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illustrative purposes. You should make your own::
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#!/bin/bash
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set -xe
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# Change these as required
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CONF_DIR=/etc/placement
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DB_DRIVER=mysql+pymysql # we assume mysql throughout, feel free to change
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DB_NAME=placement
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DB_USER=root
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DB_PASS=secret
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REPO=git://git.openstack.org/openstack/placement
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# Create a directory for configuration to live.
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[[ -d $CONF_DIR ]] || (sudo mkdir $CONF_DIR && sudo chown $USER $CONF_DIR)
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# Establish database. Some of this may need sudo powers. Don't be shy
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# about changing the script.
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mysql -u$DB_USER -p$DB_PASS -e "DROP DATABASE IF EXISTS $DB_NAME;"
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mysql -u$DB_USER -p$DB_PASS -e "CREATE DATABASE $DB_NAME CHARACTER SET utf8;"
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mysql -u$DB_USER -p$DB_PASS -e "GRANT ALL PRIVILEGES ON $DB_NAME.* TO '$DB_USER'@'%' IDENTIFIED BY '$DB_PASS';"
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# clone the right code
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git clone $REPO
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cd placement
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# establish virtenv
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tox -epy36 --notest
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# write placement.conf
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cat<<EOF > $CONF_DIR/placement.conf
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[DEFAULT]
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debug = True
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[placement_database]
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connection = $DB_DRIVER://${DB_USER}:${DB_PASS}@127.0.0.1/${DB_NAME}?charset=utf8
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[api]
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auth_strategy = noauth2
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EOF
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# Create database tables
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.tox/py36/bin/placement-manage db sync
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# install uwsgi
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.tox/py36/bin/pip install uwsgi
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# run uwsgi
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.tox/py36/bin/uwsgi --http :8000 --wsgi-file .tox/py36/bin/placement-api --processes 2 --threads 10
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@ -363,6 +363,7 @@ contribute to the placement project.
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configuration/index
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contributor/index
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contributor/api-ref-guideline
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contributor/quick-dev
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install/controller-install-obs
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install/controller-install-rdo
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install/controller-install-ubuntu
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