Most of the available ansible variables used by the galaxykickstart playbook scripts galaxy.yml and galaxy_tool_install.yml can be found in the group_vars/all file and are reproduced below, with there default values:

GKS: true
galaxy_virtualenv_python: python3
ansible_python_interpreter: python3
proxy_env: {}
install_galaxy: true
install_maintainance_packages: false
galaxy_manage_trackster: true
galaxy_create_user: true
# Privilege separation mode switch
galaxy_separate_privileges: true
# User that Galaxy runs as
galaxy_user: "{{ galaxy_user_name }}"
# User that owns Galaxy code, configs, and virutalenv, and that runs `pip install` for dependencies
galaxy_privsep_user: "{{ galaxy_user_name }}"
gks_run_data_managers: false
galaxy_hostname: "{{ inventory_hostname }}"
nginx_galaxy_location: ""
# galaxy_become_users: {} # for compatibility with ansible.galaxy. as doc seems to say
pip_virtualenv_command: virtualenv
galaxy_user_name: galaxy
galaxy_user_gid: 1450
galaxy_user_uid: 1450
postgres_user_uid: 1550
postgres_user_gid: 1550
galaxy_server_dir: /home/{{ galaxy_user_name }}/{{ galaxy_user_name }}
galaxy_venv_dir: "{{ galaxy_server_dir }}/.venv"
galaxy_local_tools_dir: "{{ galaxy_server_dir }}/tools"
galaxy_data: /home/{{ galaxy_user_name }}/{{ galaxy_user_name }}
galaxy_config_dir: "{{ galaxy_server_dir }}/config"
galaxy_database: /home/galaxy_database
galaxy_db: postgresql://{{ galaxy_user_name }}:{{ galaxy_user_name }}@localhost:5432/galaxy?client_encoding=utf8
galaxy_git_repo: https://github.com/galaxyproject/galaxy.git
galaxy_changeset_id: release_20.05
galaxy_reports_config_file: "{{ galaxy_config_dir }}/reports.yml.sample"  # Change this to "{{ galaxy_config_dir }}/reports.ini.sample" for galaxy < 17.09
galaxy_admin: admin@galaxy.org
galaxy_admin_pw: artbio2020
# use the most recent PBKDF2 function for galaxy (and proftpd) authentication
use_pbkdf2: true
proftpd_sql_auth_type: PBKDF2
proftpd_files_dir: "{{ galaxy_data }}/database/ftp"
postgresql_version: "{{ '9.3' if ansible_distribution=='Ubuntu'
                                 and ansible_distribution_version is version('15.04', '<=')
                              else '9.5' if ansible_distribution=='Ubuntu'
                                            and ansible_distribution_version is version('17.04', '<')
                              else '10' if ansible_distribution=='Ubuntu'
                                           and ansible_distribution_version is version('18.04', '<=')
                              else '12' if ansible_distribution=='Ubuntu'
                                           and ansible_distribution_version is version('20.04', '<=')
                              else '9.4' if ansible_distribution=='Debian'
                                            and ansible_distribution_version is version('8.0', '>=') }}"
supervisor_postgres_database_path: /var/lib/postgresql/{{ postgresql_version }}/main
supervisor_postgres_database_config: /etc/postgresql/{{ postgresql_version }}/main/postgresql.conf
supervisor_postgres_options: "-D {{ supervisor_postgres_database_path }} -c \"config_file={{ supervisor_postgres_database_config }}\""

# set to 'no' to skip reinitialisation and clear docker images (docker must then be already installed)
configure_docker: yes
galaxy_extras_apt_package_state: present
install_apparmor: false
tool_dependency_dir: /home/{{ galaxy_user_name }}/tool_dependencies
shed_tools_dir: "{{ galaxy_server_dir }}/../shed_tools"
tool_data_dir: "{{ galaxy_server_dir  }}/tool-data"
galaxy_mutable_data_dir: "{{ galaxy_server_dir  }}/database"
miniconda_python: 3
miniconda_version: "4.6.14"
miniconda_installer_checksum: ""
miniconda_prefix: "{{ tool_dependency_dir }}/_conda"
miniconda_manage_dependencies: False

additional_files_list:
  - { src: "extra-files/tool_sheds_conf.xml", dest: "{{ galaxy_config_dir }}" }

supervisor_env_vars:
    # Use pre-exsting env vars if they are defined
    - export IP_ADDRESS=${IP_ADDRESS:-`curl --silent icanhazip.com`}
    - export MASQUERADE_ADDRESS=${MASQUERADE_ADDRESS:-$IP_ADDRESS}
    - export GALAXY_GID="${GALAXY_GID:-{{ galaxy_user_gid }}}"
    - export GALAXY_UID="${GALAXY_UID:-{{ galaxy_user_uid }}}"
    - export NATIVE_SPEC="${NATIVE_SPEC:---ntasks=`/usr/bin/nproc` --share}"
    - export NGINX_GALAXY_LOCATION="${NGINX_GALAXY_LOCATION:-{{ nginx_galaxy_location }}}"
    - export GALAXY_CONFIG_FTP_UPLOAD_SITE="${GALAXY_CONFIG_FTP_UPLOAD_SITE:-ftp://$IP_ADDRESS}"
    - export GALAXY_CONFIG_NGINX_X_ACCEL_REDIRECT_BASE="${GALAXY_CONFIG_NGINX_X_ACCEL_REDIRECT_BASE:-$NGINX_GALAXY_LOCATION/_x_accel_redirect}"
    - export GALAXY_CONFIG_NGINX_X_ARCHIVE_FILES_BASE="{$GALAXY_CONFIG_NGINX_X_ARCHIVE_FILES_BASE:-$NGINX_GALAXY_LOCATION/_x_accel_redirect}"
    - export GALAXY_CONFIG_CONDA_AUTO_INIT="${GALAXY_CONFIG_CONDA_AUTO_INIT:-True}"

# galaxy role variables

#persistent data
galaxy_persistent_directory: /export # default value
galaxy_manage_mutable_setup: yes
galaxy_mutable_config_dir: "{{ galaxy_config_dir }}"
galaxy_config_style: "yaml"
galaxy_config_file: "{{ galaxy_config_dir }}/galaxy.yml"
#other vars
galaxy_manage_database: yes
# does not actually fetch eggs if galaxy uses pip
galaxy_fetch_eggs: yes
galaxy_vcs: git
galaxy_force_checkout: yes
# galaxykickstart adopts the yml standard for config file `galaxy.yml`
galaxy_config:
  "uwsgi":
    # other uwsgi option are defaulted in ansible-galaxy-os role
    module: galaxy.webapps.galaxy.buildapp:uwsgi_app()
    # warning the above line should be dropped when prefixing
    # upon guide-lines in  https://docs.galaxyproject.org/en/latest/admin/nginx.html
    logfile-chmod: 644
  'galaxy':
    filter-with: proxy-prefix
    prefix: "{{ nginx_galaxy_location }}" # this is not clear from the galaxy.yml.sample which in addition is not consistent with https://docs.galaxyproject.org/en/latest/admin/nginx.html
    admin_users: "{{ galaxy_admin }}"
    database_connection: "{{ galaxy_db }}"
    tool_dependency_dir: "{{ tool_dependency_dir }}"
    ftp_upload_dir: "{{ proftpd_files_dir }}"
    ftp_upload_site: "ftp://{{ ipify_public_ip }}"
    allow_user_dataset_purge: True
    allow_user_impersonation: True
    enable_quotas: True
    allow_user_deletion: True
    allow_library_path_paste: True
    tool_sheds_config_file: "{{ galaxy_config_dir }}/tool_sheds_conf.xml"
    static_enabled: False
    watch_tool_data_dir: True
    use_pbkdf2: "{{ use_pbkdf2 }}"
    len_file_path: "{{ galaxy_config_dir }}/len"
    nginx_x_accel_redirect_base: /_x_accel_redirect
    interactive_environment_plugins_directory: config/plugins/interactive_environments
    visualization_plugins_directory: config/plugins/visualizations
    # interactive environments - set dynamic_proxy_manage to true #
    dynamic_proxy_manage: false
    dynamic_proxy_session_map: database/session_map.sqlite
    dynamic_proxy_bind_port: 8800
    dynamic_proxy_bind_ip: 0.0.0.0
    dynamic_proxy_debug: true
    dynamic_proxy_external_proxy: true
    dynamic_proxy_prefix: gie_proxy

# galaxy-extras role variables
galaxy_uwsgi_static_conf: true
galaxy_web_processes: 2
galaxy_handler_processes: 4
supervisor_slurm_config_dir: "{{ galaxy_data }}"
galaxy_root: "{{ galaxy_server_dir }}"
galaxy_log_dir: "{{ galaxy_data }}"
galaxy_database_connection: "{{ galaxy_db }}"
galaxy_errordocs_dest: "/usr/share/nginx/html"
galaxy_extras_config_scripts: true
galaxy_extras_install_packages: true
galaxy_extras_config_nginx: true
galaxy_extras_config_supervisor: true
galaxy_extras_config_proftpd: true
galaxy_extras_config_uwsgi: false
galaxy_extras_config_galaxy_job_metrics: false
galaxy_extras_config_slurm: true
galaxy_extras_config_galaxy_root: true
supervisor_manage_nginx: true
supervisor_manage_proftp: true
supervisor_manage_slurm: true
supervisor_manage_reports: true
supervisor_manage_docker: false
proftpd_nat_masquerade: false
supervisor_proftpd_autostart: true
galaxy_extras_config_cvmfs: false

# To enable interactive environments set the following 3 variables to true
galaxy_extras_config_ie_proxy: false
supervisor_manage_ie_proxy: false
supervisor_ie_proxy_autostart: false
# specific ie for ipython and rstudio
galaxy_extras_ie_fetch_jupyter: false
galaxy_extras_ie_jupyter_image: quay.io/bgruening/docker-jupyter-notebook:17.09
galaxy_extras_ie_fetch_rstudio: false
galaxy_extras_ie_rstudio_image: artbio/rstudio-notebook:latest


# galaxy-tools role variables
galaxy_tools_install_tools: true
galaxy_tools_admin_user: "{{ galaxy_admin }}"
galaxy_tools_admin_username: admin
galaxy_tools_admin_user_password: "{{ galaxy_admin_pw }}"
galaxy_tools_admin_user_preset_api_key: true
default_admin_api_key: artbio2020
galaxy_tools_api_key: "{{ default_admin_api_key }}"
galaxy_tools_create_bootstrap_user: true
galaxy_tools_delete_bootstrap_user: false
galaxy_tools_galaxy_instance_url: http://"{{ galaxy_hostname }}{{ nginx_galaxy_location }}"/
galaxy_tools_tool_list_files: []
galaxy_tools_install_workflows: true
galaxy_tools_workflows: []