Error fetching the checksums file

[nop33]

What happened?

Runninig a minimal playbook with the default vars of the role generates this error:

TASK [cloudalchemy.prometheus : Get checksum list] *******************************************************************
/usr/lib/python3.8/site-packages/requests/__init__.py:89: RequestsDependencyWarning: urllib3 (1.26.0) or chardet (3.0.4) doesn't match a supported version!
  warnings.warn("urllib3 ({}) or chardet ({}) doesn't match a supported "
fatal: [my.domain.name]: 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/prometheus/releases/download/v2.22.0/sha256sums.txt : <urlopen error [Errno -2] Name does not resolve>"}

Did you expect to see some different?

Yes, to fetch the checksums file.

How to reproduce it (as minimally and precisely as possible):

Using a minimal playbook after downloading the role:

# monitoring.yml
---
- hosts: monitoring
  roles:
    - role: cloudalchemy.prometheus

and running it:

ansible-playbook monitoring.yml

Environment

• Role version:

  2.22.0

• Ansible version information:

  ansible 2.10.2

• Variables:

all the default ones

• Ansible playbook execution Logs:

PLAY [monitoring] ****************************************************************************************************

TASK [Gathering Facts] ***********************************************************************************************
ok: [my.domain.name]

TASK [cloudalchemy.prometheus : Gather variables for each operating system] ******************************************
ok: [my.domain.name] => (item=/etc/ansible/vendor_roles/cloudalchemy.prometheus/vars/debian.yml)

TASK [cloudalchemy.prometheus : Assert usage of systemd as an init system] *******************************************
ok: [my.domain.name] => {
    "changed": false,
    "msg": "All assertions passed"
}

TASK [cloudalchemy.prometheus : Get systemd version] *****************************************************************
ok: [my.domain.name]

TASK [cloudalchemy.prometheus : Set systemd version fact] ************************************************************
ok: [my.domain.name]

TASK [cloudalchemy.prometheus : Assert no duplicate config flags] ****************************************************
ok: [my.domain.name] => {
    "changed": false,
    "msg": "All assertions passed"
}

TASK [cloudalchemy.prometheus : Assert external_labels aren't configured twice] **************************************
ok: [my.domain.name] => {
    "changed": false,
    "msg": "All assertions passed"
}

TASK [cloudalchemy.prometheus : Set prometheus external metrics path] ************************************************
ok: [my.domain.name]

TASK [cloudalchemy.prometheus : Fail when prometheus_config_flags_extra duplicates parameters set by other variables] ***
skipping: [my.domain.name] => (item=storage.tsdb.retention)
skipping: [my.domain.name] => (item=storage.tsdb.path)
skipping: [my.domain.name] => (item=storage.local.retention)
skipping: [my.domain.name] => (item=storage.local.path)
skipping: [my.domain.name] => (item=config.file)
skipping: [my.domain.name] => (item=web.listen-address)
skipping: [my.domain.name] => (item=web.external-url)

TASK [cloudalchemy.prometheus : Get all file_sd files from scrape_configs] *******************************************
ok: [my.domain.name]

TASK [cloudalchemy.prometheus : Fail when file_sd targets are not defined in scrape_configs] *************************

TASK [cloudalchemy.prometheus : Alert when prometheus_alertmanager_config is empty, but prometheus_alert_rules is specified] ***
ok: [my.domain.name] => {
    "msg": "No alertmanager configuration was specified. If you want your alerts to be sent make sure to specify a prometheus_alertmanager_config in defaults/main.yml.\n"
}

TASK [cloudalchemy.prometheus : Get latest release] ******************************************************************
skipping: [my.domain.name]

TASK [cloudalchemy.prometheus : Set prometheus version to {{ _latest_release.json.tag_name[1:] }}] *******************
skipping: [my.domain.name]

TASK [cloudalchemy.prometheus : Get checksum list] *******************************************************************
/usr/lib/python3.8/site-packages/requests/__init__.py:89: RequestsDependencyWarning: urllib3 (1.26.0) or chardet (3.0.4) doesn't match a supported version!
  warnings.warn("urllib3 ({}) or chardet ({}) doesn't match a supported "
fatal: [my.domain.name]: 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/prometheus/releases/download/v2.22.0/sha256sums.txt : <urlopen error [Errno -2] Name does not resolve>"}

NO MORE HOSTS LEFT ***************************************************************************************************

PLAY RECAP ***********************************************************************************************************
my.domain.name         : ok=10   changed=0    unreachable=0    failed=1    skipped=4    rescued=0    ignored=0

Anything else we need to know?:
🤷

[nop33]

After upgrading the requests package on the target machine, the warning disappeared but the error remains:

TASK [cloudalchemy.prometheus : Get checksum list] *******************************************************************
fatal: [my.domain.name]: 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/prometheus/releases/download/v2.22.0/sha256sums.txt : <urlopen error [Errno -2] Name does not resolve>"}

[nop33]

My ansible controller was running alpine:edge. Changing it to alpine:3.12.1, the error disappeared. This issue helped: gliderlabs/docker-alpine#539

Closing issue.