Ansible templates 

{% for host in groups['db_servers'] %}
   {{ host }}
   {{ hostvars[host]['ansible_eth0']['ipv4']['address'] }}
{% endfor %}

{% elif  student.department.upper() != "MATHS DEPARTMENT" %}
    Maths department
{% endif %}

# generate SSH config
{% for host in groups['vm.example.com'] %}
Host {{ host }}
  Hostname {{ hostvars[host]['ansible_eth0']['ipv4']['address'] }}
{% endfor %}

{% for host in groups['all'] %}
  "{{ host }}"{% if not loop.last %},{% endif %}
{% endfor %}

# value by group (condition)
{% if 'www' in group_names and ansible_fqdn in groups['www'] %}
foo=true
{% else %}
foo=false
{% endif %}

{% if 'index.html' in request.build_absolute_uri %}
    hello
{% else %}
    bye
{% endif %}

{% if grains['os'] == 'Fedora' -%}
mailq_path = /usr/bin/mailq.postfix
{% elif grains['os'] == 'Arch' -%}
mailq_path = /usr/bin/mailq
{-% endif %}

{% if os_env == "stage" and 'control-node' in inventory_hostname %}
    storage-extern:
      id: 1234
{% endif %}

{% if ( (foo == 'foo' or bar == 'bar') and (fooo == 'fooo' or baar == 'baar') ) %}
 ...
{% endif %}
{% set keystone_cmd = 'apache2' if kolla_base_distro in ['ubuntu', 'debian'] else 'httpd' %}
{% set keystone_dir = 'apache2/conf-enabled' if kolla_base_distro in ['ubuntu', 'debian'] else 'httpd/conf.d' %}
{
    "command": "/usr/sbin/{{ keystone_cmd }}",

Links
http://jinja.pocoo.org/docs/dev/templates/#line-statements

Ansible

Release and maintenance / latest versions
# stable
https://docs.ansible.com/ansible/latest/reference_appendices/release_and_maintenance.html#release-status
# devel
https://docs.ansible.com/ansible/devel/modules/list_of_all_modules.html

Ansible playbook repository
https://github.com/panticz/ansible

Install Ansible
http://www.panticz.de/install-ansible

Configuration
https://gist.github.com/wbcurry/f38bc6d8d1ee4a70ee2c
https://docs.ansible.com/ansible/2.4/intro_configuration.html#remote-tmp
https://docs.ansible.com/ansible/latest/reference_appendices/config.html#ansible-configuration-settings-locations
https://raw.githubusercontent.com/ansible/ansible/devel/examples/ansible.cfg

# include order
./ansible.cfg
~/.ansible.cfg
/etc/ansible/ansible.cfg

[defaults]
retry_files_enabled = False
stdout_callback = debug
bin_ansible_callbacks = True
ansible_python_interpreter = /usr/bin/python
host_key_checking = False
inventory = hosts
forks = 99
retry_files_enabled = false
roles_path = ./my_roles
pipelining = True
scp_if_ssh = True
max_fail_percentage = 0

[privilege_escalation]
become=True


cat <> ~/.bashrc
export ANSIBLE_VAULT_PASSWORD_FILE=~/.ansible/.vault_pass
export ANSIBLE_STDOUT_CALLBACK=debug
export ANSIBLE_HOST_KEY_CHECKING=false
# export ANSIBLE_DEBUG=True
# export ANSIBLE_LOG_PATH=/var/log/ansible.log
# export ANSIBLE_PYTHON_INTERPRETER=/usr/bin/python3
EOF

DISPLAY_SKIPPED_HOSTS=0

Callback plugin

# test me
nixy, dense, or debug.
export ANSIBLE_STDOUT_CALLBACK=debug

Configuration

[defaults]
log_path=/var/log/ansible.log
#stdout_callback = yaml
stdout_callback = debug
# inventory = ./inventory
host_key_checking = False
retry_files_enabled = False

[ssh_connection]
retries=999999

Ansible syntax (YAML)
http://docs.ansible.com/ansible/YAMLSyntax.html

Configuration files
http://docs.ansible.com/ansible/intro_configuration.html#host-key-checking

ansible