gistfile1.txt

error output
# salt 'ch11' state.sls zookeeper
ch11:
----------
    State: - pkg
    Name:      zookeeper
    Function:  installed
        Result:    True
        Comment:   Package zookeeper is already installed
        Changes:
----------
    State: - file
    Name:      /etc/zookeeper/conf/zoo.cfg
    Function:  managed
        Result:    False
        Comment:   unknown tag 'idx'; line 11 in template
        Changes:

my file context

maxClientCnxns={{maxcliconns}}
tickTime={{ticktime}}
initLimit={{initlimit}}
syncLimit={{synclimit}}
dataDir={{datadir}}
clientPort={{clientport}}

{% for i in pillar['cluster'] %}
{% set idx=0 %}
{{'server.'~idx~'='~i~':2888:3888'}}
{% idx=idx+1 %}
{% endfor %}

and my sls file

zookeeper:
  pkg.installed:
    - skip_verify: False

/etc/zookeeper/conf/zoo.cfg:
  file.managed:
   - source: salt://zookeeper/zoo.cfg
   - template: jinja
   - require:
      - pkg: zookeeper
   - defaults:
       maxcliconns: {{pillar['maxcliconns']}}
       ticktime: {{pillar['ticktime']}}
       initlimit: {{pillar['initlimit']}}
       synclimit: {{pillar['synclimit']}}
       datadir: {{pillar['datadir']}}
       clientport: {{pillar['clientport']}}