Will Szumski a3d3649c5e Install libffi headers

This is to resolve the following issue in CI:

    c/_cffi_backend.c:15:17: fatal error: ffi.h: No such file or directory
     #include <ffi.h>
                     ^
    compilation terminated.
    error: command 'gcc' failed with exit status 1
    ----------------------------------------
ERROR: Command errored out with exit status 1: /home/zuul/kayobe-venv/bin/python -u -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/tmp/pip-install-PV3WhJ/cffi/setup.py'"'"'; __file__='"'"'/tmp/pip-install-PV3WhJ/cffi/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' install --record /tmp/pip-record-ZvlZVY/install-record.txt --single-version-externally-managed --compile --install-headers /home/zuul/kayobe-venv/include/site/python2.7/cffi Check the logs for full command output.

Change-Id: I1bd724be7dc77058870f37cb1c9404472fa466ca
see: https://zuul.opendev.org/t/openstack/build/c20a316a699b4073abf75960634ebfcd

2019-10-15 13:35:15 +01:00

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Installation

Kayobe can be installed via the released Python packages on PyPI, or from source. Installing from PyPI ensures the use of well used and tested software, whereas installing from source allows for the use of unreleased or patched code. Installing from a Python package is supported from Kayobe 5.0.0 onwards.

Prerequisites

Currently Kayobe supports the following Operating Systems on the Ansible control host:

CentOS 7.6
Ubuntu 16.04

To avoid conflicts with python packages installed by the system package manager it is recommended to install Kayobe in a virtualenv. Ensure that the virtualenv python module is available on the Ansible control host. It is necessary to install the GCC compiler chain in order to build the extensions of some of kayobe's python dependencies.

On CentOS:

$ yum install -y python-devel python-virtualenv gcc libffi-devel

On Ubuntu:

$ apt install -y python-dev python-virtualenv gcc libffi-dev

If installing Kayobe from source, then Git is required for cloning and working with the source code repository.

On CentOS:

$ yum install -y git

On Ubuntu:

$ apt install -y git

Local directory structure

The directory structure for a Kayobe Ansible control host environment is configurable, but the following is recommended, where <base_path> is the path to a top level directory:

<base_path>/
    src/
        kayobe/
        kayobe-config/
        kolla-ansible/
    venvs/
        kayobe/
        kolla-ansible/

This pattern ensures that all dependencies for a particular environment are installed under a single top level path, and nothing is installed to a shared location. This allows for the option of using multiple Kayobe environments on the same control host.

Creation of a kayobe-config source code repository will be covered in the configuration guide <configuring-kayobe>. The Kolla Ansible source code checkout and Python virtual environment will be created automatically by kayobe.

Not all of these directories will be used in all scenarios - if Kayobe or Kolla Ansible are installed from a Python package then the source code repository is not required.

Installation from PyPI

This section describes how to install Kayobe from a Python package in a virtualenv. This is supported from Kayobe 5.0.0 onwards.

First, change to the top level directory, and make the directories for source code repositories and python virtual environments:

$ cd <base_path>
$ mkdir -p src venvs

Create a virtualenv for Kayobe:

$ virtualenv <base_path>/venvs/kayobe

Activate the virtualenv and update pip:

$ source <base_path>/venvs/kayobe/bin/activate
(kayobe) $ pip install -U pip

If using the latest version of Kayobe:

(kayobe) $ pip install kayobe

Alternatively, to install a specific release of Kayobe:

(kayobe) $ pip install kayobe==5.0.0

Finally, deactivate the virtualenv:

(kayobe) $ deactivate

Installation from source

This section describes how to install Kayobe from source in a virtualenv.

First, change to the top level directory, and make the directories for source code repositories and python virtual environments:

$ cd <base_path>
$ mkdir -p src venvs

Next, obtain the Kayobe source code. For example:

$ cd <base_path>/src
$ git clone https://opendev.org/openstack/kayobe.git

Create a virtualenv for Kayobe:

$ virtualenv <base_path>/venvs/kayobe

Activate the virtualenv and update pip:

$ source <base_path>/venvs/kayobe/bin/activate
(kayobe) $ pip install -U pip

Install Kayobe and its dependencies using the source code checkout:

(kayobe) $ cd <base_path>/src/kayobe
(kayobe) $ pip install .

Finally, deactivate the virtualenv:

(kayobe) $ deactivate

Editable source installation

From Kayobe 5.0.0 onwards it is possible to create an editable install of Kayobe. In an editable install, any changes to the Kayobe source tree will immediately be visible when running any Kayobe commands. To create an editable install, add the -e flag:

(kayobe) $ cd <base_path>/src/kayobe
(kayobe) $ pip install -e .

This is particularly useful when installing Kayobe for development.

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