Jinja/Python String Conditionals in State Files?

[Robert Parker]

I have a set of more or less identical servers with very similar names and they are arbitrarily grouped into app clusters.  I need a way, based on arbitrary hostname with an ordinal on the end, to group them together and give them a unique config file within a salt state file.  

So, I have a group of 12 servers, named server1, server2, server3 [..] server12, etc.    Servers 1-4 are in cluster 1, 5-8 are in cluster 2, and 9-12 are in cluster 3.  What I want is something like this:

/etc/sysconfig/tomcat7:

   file.managed:

     - source:

     # Cluster 1

     {% if grains['host'].endswith ('1|2|3|4)' %}             

       - salt://files/config/tomcat7.conf.cluster1

     {% endif %}

     # Cluster 2

     {% if grains['host'].endswith ('3|4|5|6)' %}             

       - salt://files/config/tomcat7.conf.cluster2

     {% endif %}

     # Cluster 3

     {% if grains['host'].endswith ('7|8|9|10)' %}             

       - salt://files/config/tomcat7.conf.cluster3

     {% endif %}

     - user: tomcat

     - group: tomcat

     - mode: 644

However the "  {% if grains['host'].endswith ('x|y|z)' %} " statement doesn't seem to work.  What is the right syntax to do something like this?

Thanks,

Robert

[Umberto Nicoletti]

Totally untested, but should/might work (with minor adjustments):

 {% if grains['host']|truncate(6,True,'') in range(1,4) %}      

truncate and | are respectively documented at:

http://jinja.pocoo.org/docs/templates/#filters

http://jinja.pocoo.org/docs/templates/#list-of-builtin-filters

hth,

Umberto

[Robert Parker]

Hmm, this is nice but I need something more flexible that can work with hostnames of varyling lengths if need be.  is there no way to invoke a regexp within a jinja conditional?

Robert

[Avi Marcus]

Perhaps: set a grain to specify which cluster the machine is in. That will let you cleanly use this information in more places.

-Avi

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[Miguel]

Check this conversation out for how to get a helper set up to do what you want:

https://groups.google.com/forum/#!msg/salt-users/EUbnCGlroAA/JcW-U9r66PsJ

[Mrten]

On 16/7/2013 21:24 , Robert Parker wrote:

> Hmm, this is nice but I need something more flexible that can work with
> hostnames of varyling lengths if need be. is there no way to invoke a
> regexp within a jinja conditional?

if you need to go there it is imho more effective to jump over to a mako
renderer which allows easy escapes into python, or even write a pure
python renderer.

jinja is only practical for simple logic (which makes sense, given
jinja's original goal).

M.

[Ethan Erchinger]

{% set shortname = grains['id'].split('.')[0] %}

{% set cluster = shortname.rstrip('1234567890') %}

{% set hostid = shortname.split(cluster)[1]|int %}

{% if hostid in range(1,4) %}