To use Ansible, generally you create a “playbooks” directory in your /home/user/, then get the following filesystem inside :

playbooks:-> <role_name>.yml  (Playbooks to run, often matches the name of a single role you want to run, or 
         |                     another when you run several roles)
         |-> inventory.ini    (List of all servers to run playbooks on, with host specific variables)
         |-> isc_compute.ini  (Chacha Disco and Tango for example)
         |-> labs.ini         (Calypso lab nodes)
         |-> test.ini         (Custom list for testing)
         |-> users.yml        (The main source for users IDs and assignation of groups, since we don't have access
         |                     to the HES LDAP to manage groups ourselves there. Contains UID/GID, shell and pass
         |                     only for the default/rescue user)
         |-> ansible.cfg      (Ansible local configuration for your user : python interpreter version for example)
         |
         L-> roles:-> <rolename>:
                                |
                                L-> files:       (Contains all files needed for your playbook, ansible checks this directory 
                                |        |        first when you reference a file)
                                |        L-> authorized_keys/remi.key
                                |        L-> remi_home.tar.gz
                                |
                                L-> handlers:    (Small repetitive tasks to be called in a playbook, like restart a systemd service)
                                |           L-> restart_mysql_then_apache.yml
                                |
                                L-> tasks:       (Main dir for all tasks to run)
                                |        L-> main.yml    (The first task called when the role is run)
                                |        L-> isc3.yml    (Supplementary tasks you can call in your main task)
                                |
                                L-> vars:
                                        L-> Specific variable file for the role
               

For now that we don't really have a server for this purpose, I'm using my laptop to deploy configurations using Ansible. (Remi)

playbooks:-> <role_name>.yml  (Playbooks to run)
         |-> inventory.ini    (List of all servers to run playbooks on)
         |-> isc_compute.ini  (Chacha and Disco for example)
         |-> labs.ini         (Calypso nodes)
         |-> test.ini         (Custom list)
         |-> users.yml        (The main source for users IDs and assignation of groups, since we don't have access
         |                     to the HES LDAP to manage groups ourselves there. Contains UID/GID, shell and pass
         |                     only for the default/rescue user)
         |
         L-> roles:-> calypso-sys:    (Configures all calypso worker nodes, with all
                  |                    users, software, and system configs)
                  |-> rumba-sys:      (Configures rumba master, with all
                  |                    users, software, and system configs)
                  |-> isc_compute:    (Configures Disco and Chacha users, software and system configs)
                  |-> julia:          (Installs Julia for a user, since there are no system-wide install)
                  |-> k8s:            (Configures Kubernetes on all Calypso nodes)       
                  |-> master-sys:     (Configures system configs specific on calypsomaster only)
                  |-> munge:          (Needed to authenticate SLURM nodes on Calypso and ISC Compute)
                  |-> nvidia-cuda:    (Needed to allow servers to use Nvidia GPUs)
                  |-> prometheus:     (TODO : Installs prometheus exporters and server, separate in 2 playbooks)
                  |-> slurm_research: (TODO : redo all installation part from compilation 
                  |                    install, separate install from config)
                  |-> slurm_calypso:  (TODO : redo all installation part from compilation
                                       install, separate install from config)

Manages all Calypso lab servers configurations.

calypso-sys/-> tasks/-> main.yml    (All tasks to configure timezone, system umask, groups and users, default user,
           |        |               base packages, ssh keys deployment, NFS homes configs, symlinks in each home,
           |        |               fastfetch install, systemd tweaks to fasten boot time, set /etc/hosts entries,
           |        |               put sudoers files, install Apptainer, then run isc[1,2,3].yml tasks )
           |        |-> root.yml    (Specific root user configuration)
           |        |-> iscx.yml    (Configures students accounts for isc[1,2,3] class)
           |
           |-> files/-> authorized_keys/-> user.name  (SSH public keys to deploy for each user)
                    |
                    |-> admin_user_home_config/       (Containing configs like .zshrc, .config/ and .oh-my-zsh/ )
                    |
                    |-> sudoers.d/username            (Containing sudoers specific files for a user, without
                                                         dot in the name)