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Qinling Installation Guide

Prerequisites

It is necessary to install some specific system libs for installing Qinling. They can be installed on most popular operating system using their package manager (for Ubuntu - apt, for Fedora - dnf, CentOS - yum, for Mac OS -brew or macports). The list of needed packages is shown below:

  1. python-dev
  2. python-setuptools
  3. python-pip
  4. libffi-dev
  5. libxslt1-dev (or libxslt-dev)
  6. libxml2-dev
  7. libyaml-dev
  8. libssl-dev

In case of Ubuntu, just run:

$ apt-get install -y python-dev python-setuptools python-pip libffi-dev libxslt1-dev \
  libxml2-dev libyaml-dev libssl-dev

NOTE: Qinling can be used without authentication at all or it can work with OpenStack. In case of OpenStack, it works only on Keystone v3, make sure Keystone v3 is installed.

Installation

First of all, clone the repo and go to the repo directory:

$ git clone https://github.com/openstack/qinling.git
$ cd qinling

Generate config:

$ tox -egenconfig

Configure Qinling as needed. The configuration file is located in etc/qinling.conf.sample. You will need to modify the configuration options and then copy it into /etc/qinling/qinling.conf. For details see Qinling Configuration Guide </guides/configuration_guide>

Virtualenv installation:

$ tox

This will install necessary virtual environments and run all the project tests. Installing virtual environments may take significant time (~10-15 mins).

Local installation:

$ pip install -e .

or:

$ pip install -r requirements.txt
$ python setup.py install

NOTE: Differences pip install -e and setup.py install. pip install -e works very similarly to setup.py install or the EasyInstall tool, except that it doesn’t actually install anything. Instead, it creates a special .egg-link file in the deployment directory, that links to your project’s source code.

Before the first run

After installation you will see qinling-server and qinling-db-manage commands in your environment, either in system or virtual environment.

NOTE: In case of using virtualenv, all Qinling related commands available via tox -evenv --. For example, qinling-server is available via tox -evenv -- qinling-server.

qinling-db-manage command can be used for migrations.

For updating the database to the latest revision type:

$ qinling-db-manage --config-file <path-to-qinling.conf> upgrade head

Before starting Qinling server, run qinling-db-manage populate command. It prepares the DB, creates in it with all standard actions and standard workflows which Qinling provides for all Qinling users.:

$ qinling-db-manage --config-file <path-to-qinling.conf> populate

For more detailed information about qinling-db-manage script please see Qinling Upgrade Guide </guides/upgrade_guide>.

NOTE: For users who want a dry run with SQLite database backend(not used in production), qinling-db-manage is not recommended for database initialization because of SQLite limitations. Please use sync_db script described below instead for database initialization.

If you use virtualenv:

$ tools/sync_db.sh --config-file <path-to-qinling.conf>

Or run sync_db directly:

$ python tools/sync_db.py --config-file <path-to-qinling.conf>

Running Qinling API server

To run Qinling API server perform the following command in a shell:

$ qinling-server --server api --config-file <path-to-qinling.conf>

Running Qinling Engines

To run Qinling Engine perform the following command in a shell:

$ qinling-server --server engine --config-file <path-to-qinling.conf>

Running Qinling Task Executors

To run Qinling Task Executor instance perform the following command in a shell:

$ qinling-server --server executor --config-file <path-to-qinling.conf>

Note that at least one Engine instance and one Executor instance should be running so that workflow tasks are processed by Qinling.

Running Multiple Qinling Servers Under the Same Process

To run more than one server (API, Engine, or Task Executor) on the same process, perform the following command in a shell:

$ qinling-server --server api,engine --config-file <path-to-qinling.conf>

The --server command line option can be a comma delimited list. The valid options are "all" (by default if not specified) or any combination of "api", "engine", and "executor". It's important to note that the "fake" transport for the rpc_backend defined in the config file should only be used if "all" the Qinling servers are launched on the same process. Otherwise, messages do not get delivered if the Qinling servers are launched on different processes because the "fake" transport is using an in process queue.

Qinling Client Installation

Please refer to Qinling Client / CLI Guide </guides/mistralclient_guide>