By default firewalld is not installed (CentOS Cloud image), the playbook drops this error, this patch aims to fix the issue :

TASK: [mariadb | insert firewalld rule] ***************************************
failed: [localhost] => {"failed": true, "parsed": false}
failed=True msg='firewalld required for this module'
OpenSSH_6.6.1, OpenSSL 1.0.1e-fips 11 Feb 2013
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 56: Applying options for *
debug1: auto-mux: Trying existing master
debug1: mux_client_request_session: master session id: 2
Shared connection to localhost closed.


FATAL: all hosts have already failed -- aborting

PLAY RECAP ********************************************************************
           to retry, use: --limit @/root/site.retry

localhost                  : ok=10   changed=9    unreachable=0    failed=1