create virtualenv with pip modle and centos scl (rh-python36)

[Peter Hudec]

Hi all,

I’m trying to solve following problem.

I need to create virtualenv for python using centos scl rh-python36

Manual way is easy, there are several way how to do that

/opt/rh/rh-python36/root/bin/python -m venv env
. ./env/bin/activate
pip install -U pip setuptools
pip install -t requirements.txt

But but with ansible I’m a little bit lost.

- name: create virtualenv
pip:
virtualenv: "{{ haproxy_tools_remote_dir }}/{{ haproxy_tools_version }}/env"
virtualenv_python: "/opt/rh/{{ haproxy_tools_scl_python }}/root/bin/python"
requirements: "{{ haproxy_tools_remote_dir }}/{{ haproxy_tools_version }}/requirements.txt"
tags:
- debug

The output is
fatal: [lb01.test.host.sk]: FAILED! => {"changed": false, "msg": "No setuptools found in remote host, please install it first.”}

Any idea, please ?

regards
Peter

[Matt Martz]

I believe the problem is that the system python at /usr/bin/python doesn't have python-setuptools installed

You would need to either install python-setuptools via yum, or set `ansible_python_interpreter` to `/opt/rh/rh-python36/root/bin/python` so that ansible is using that SCL python also.

By default ansible will use /usr/bin/python on the remote, and use that to configure the virtualenv, but configure the virtualenv to use the SCL python.  So basically ansible is using 1 python to run another.

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Matt Martz
@sivel
sivel.net