ansible-playbook: "Failed to update cache: unknown reason" - ansible

Question

I am trying to deploy kypo cyber range and am following its official guide. While deploying the whole range using ansible-playbook, I am stuck on above error:
TASK [docker : install prerequisites] ******************************************************************
fatal: [192.168.211.208]: FAILED! => {"changed": false, "msg": "Failed to update apt cache: unknown reason"}
I have manually checked apt-get update which initially gave me a notification of:
N: Skipping acquire of configured file 'stable/binary-i386/Packages' as repository 'https://download.docker.com/linux/ubuntu focal InRelease' doesn't support architecture 'i386'
I followed this to add [amd=64] to repository which cleaned the error. Now apt-get update runs with without any warnings or errors, but ansible-playbook keeps on generating this error.
I changed the verbosity level and got:
fatal: [192.168.211.208]: FAILED! => {
"changed": false,
"invocation": {
"module_args": {
"allow_unauthenticated": false,
"autoclean": false,
"autoremove": false,
"cache_valid_time": 0,
"deb": null,
"default_release": null,
"dpkg_options": "force-confdef,force-confold",
"force": false,
"force_apt_get": false,
"install_recommends": null,
"name": [
"apt-transport-https",
"ca-certificates"
],
"only_upgrade": false,
"package": [
"apt-transport-https",
"ca-certificates"
],
"policy_rc_d": null,
"purge": false,
"state": "present",
"update_cache": true,
"update_cache_retries": 5,
"update_cache_retry_max_delay": 12,
"upgrade": null
}
},
"msg": "Failed to update apt cache: unknown reason"
}
How can I fix this?

Answer 1

In Kypo CRP, while playing the ansible playbook the error was actually coming from one of the instances of openstack which I found out by increasing verbosity in command -vvvv. Everything was fine with the host machine. So I look for changes in instances and the root cause was there was no internet access. Once I managed to connect them to external world, the error went away.