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phgrau/gist:4048239

Forked from anonymous/gist:4047604
Created November 9, 2012 21:07
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  1. @invalid-email-address Anonymous created this gist Nov 9, 2012.
    89 changes: 89 additions & 0 deletions gistfile1.txt
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    Variables
    ==========
    predefined variables :
    - inventory_hostname (fqdn) (normally the same as ansible.fqdn)
    - inventory_hostname_short

    To know the return codes returned by ansible modules, just use plain ansible -vvv to see them :
    ansible -i ~/ansible/arrfab.net/hosts/hosts.cfg -vvv -m copy -a 'src=files/sysinfo dest=/etc/sysinfo' tungstene.arrfab.net
    tungstene.arrfab.net | success >> {
    "changed": true,
    "daisychain_args": "src=files/sysinfo dest=/etc/sysinfo src=/var/tmp/ansible-1351514206.18-224994873189361/sysinfo",
    "dest": "/etc/sysinfo",
    "group": "root",
    "md5sum": "e5e0af8c573543d6beb837ce2ef3e019",
    "mode": "0644",
    "owner": "root",
    "path": "/etc/sysinfo",
    "secontext": "root:object_r:etc_t",
    "src": "/var/tmp/ansible-1351514206.18-224994873189361/sysinfo",
    "state": "file"
    }
    so you know you can use ${status.changed} as a variable for logging/mails, etc...
    example :
    action: template ...
    register: mytemplate

    action: blablah
    only_if: '${mytemplate.changed}' #other way of saying only_if: "'${mytemplate.changed}' == 'True'"

    If your variables is a list containing one iteam on each line , you can use
    register: users
    and used ${users.stdout_lines}

    only_if
    =========

    Test if a variable is defined
    only_if: "is_set('${ansible_default_ipv4.gateway}')"

    String comparison
    only_if: "'$declared_user' == 'arrfab'"

    Misc
    only_if: "'$ansible_distribution_version'.startswith('5.')"

    only_if: "'${blah}' == 'blah' or '${blah}' == 'otherblah'"
    only_if: "'${blah}' in ('blah', 'otherblah')"

    Templates
    ==========
    You can just use variables in jinja2 templates like this : ${my_variable} (attention, variables can't contain . as in my.variable !
    Some default variables can be used, like {{ ansible_managed }}, $template_host, $template_uid and $template_path

    a for loop :
    {% for a in name_of_your_list %}
    blabla
    { %endfor %}(name of your list being defined somewhere else in the vars section like name_of_your_list: [one,two,three]

    {% if 'webserver' in group_names %}
    # some part of a configuration file that only applies to webservers

    {% endif %}

    {% for host in groups['app_servers'] %}
    # something that applies to all app servers.
    {{ hostvars[host].ansible_eth0.ipv4.address }}
    {% endfor %}

    # resolv.in by {{ name | upper }}
    # for {{ ansible_eth0.ipv4.address }}
    {% if domain is defined -%}
    domain {{ domain }}
    {% endif -%}
    {% for ns in resolvers -%}
    nameserver {{ ns }}
    {% endfor %}

    {% if is_cluster_member == True %}
    This machine is member of a cluster
    {% else %}
    {% endif %}

    Using nesting variables: trying to show ansible_eth0.macaddress, but eth0 itself being a variable defined in the playbook or vars_prompt (user_interface)
    user interface: {{ user_interface }}
    {% set iface = 'ansible_' + user_interface %}
    show: iface = {{ iface }}
    show: inventory_hostname = {{ inventory_hostname }}
    {% set ifacedata = hostvars[inventory_hostname][iface] %}
    mac address of {{ iface }} is {{ ifacedata.macaddress }}