How to use hosts listed in a group in a template, excluding the current host.

[John Wang]

I'm new to Ansible and want use it to configure a NTP service. here is my situation:

my hosts file:

    

    [ntp_servers]

    s1.aaa.com

    s2.aaa.com

    s3.aaa.com

    s4.aaa.com

The "/taskts/mail.yaml"  for role "ntp_server":

   - name: install ntp

     apt: name=ntp state=present

   - name: config ntpd

     template: src=ntp.conf dest=/etc/ntp.conf

The "templates/ntp.conf" for role "ntp_server":

   

    ...

    restrict {{ ntp_net }} mask {{ ntp_netmask }} nomodify notrap

    {% for svr in servers %}

    peer svr

    {% endfor %}

    ...

My questions are about for loop in the template file (please leave along the NTP specific things): 

1. How to refer the hosts defined in the hosts file from within the template file? In another words, I need the value of "servers" variable in the for loop to be a list of "s1.aaa.com", "s2.aaa.com" ... 
   
2. How to know the current host so that the for loop could exclude it(it should not be peer to itself) ?

Thanks and Regards

John

 

[Michael Peters]

Try something like this:

{% for svr in groups.ntp_servers %}
{% if not svr == inventory_hostname %}
peer svr
{% endif %}
{% endfor %}

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[Brian Coca]

also:

{% for svr in groups.ntp_servers|difference([inventory_hostname]) %}

  peer svr

{% endfor %}

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Brian Coca
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[John Wang]

I know it should be simple, but never imagine it is soooo simple. Thanks guys.