Add Support for over proxy installation

[matanbaruch]

What happened?
Cannot fetch binaries over proxy

How to reproduce it (as minimally and precisely as possible):
We would like to export a proxy to the machine and use that proxy
export https_proxy=https://proxy-server:8080; ansible-playbook -i hosts playbook.yml

Environment

Linux

• Ansible version information:

ansible 2.8.0

• Ansible playbook execution Logs:

fatal: [host01]: FAILED! => {"msg": "An unhandled exception occurred while running the lookup plugin 'url'. Error was a <class 'ansible.errors.AnsibleError'>, original message: Failed lookup url for https://github.com/prometheus/node_exporter/releases/download/v0.18.1/sha256sums.txt : <urlopen error [Errno 111] Connection refused>"}

Anything else we need to know?:
Please add

validate_certs: False

In here
https://github.com/cloudalchemy/ansible-node-exporter/blob/master/tasks/preflight.yml#L78
https://github.com/cloudalchemy/ansible-node-exporter/blob/master/tasks/install.yml#L23

Same as
https://github.com/cloudalchemy/ansible-node-exporter/blob/master/tasks/preflight.yml#L58

[paulfantom]

validate_certs: False reduces security of any installation and shouldn't be made a default setting. We follow "secure-by-default" policy and try to make a good example. But thanks for finding one case where we did something wrong 👍

For proxied environments, you should distribute valid certificates and either have a CA server or add CA bundle to every host so the cert is trusted.

---

Closing as this won't be implemented
PR #148 fixes one case of validate_certs: false which was left out for unknown reason.

[mickaeltr]

Hello,
We're hitting the same problem with a Squid proxy.
Would that be an option to add a flag to disable certificate validation, to workaround this: ansible/ansible#32750 ?