Bind Zone File in Saltstack

bind.sls

/etc/bind/db.salt.example.com:
  file.managed:
    - source: salt://templates/db.salt.example.com.pyt
    - template: jinja
    - user: root
    - group: bind
    - mode: 644

bind_reload:
  service.running:
    - name: bind9
    - watch:
        - file: /etc/bind/db.salt.example.com

db.salt.example.com.pyt

$ORIGIN salt.example.com.
$TTL 60	    ; 1 minute
{% set serial = salt['cmd.run']('date +%Y%m%d%H') %}
@	IN  SOA ns1.salt.example.com. root.salt.example.com. (
		{{ serial }}        ; serial
		604800     ; refresh (1 week)
		86400      ; retry (1 day)
		2419200    ; expire (4 weeks)
		604800     ; minimum (1 week)
		)
@		NS	ns1.salt.example.com.
@		NS	ns2.salt.example.com.
{% for host, grains in salt['mine.get']('*', 'grains.items').items() %}{{ grains['host'] }}		A	{{ grains['ip_interfaces']['eth0'][0] }}
{% endfor %}