Ansibleのjoinとsequenceのサンプル

join.yml

- name: join and sequence example
  hosts: localhost
  become: no
  gather_facts: False
  vars:
    data: [foo, bar, baz]
  tasks:
  -
    name: join example
    debug: msg="{{ data|join(', ') }}"
  -
    name: sequence example
    debug: msg="{{ 'count %02d'|format(item|int) }}"
    with_sequence: count=4
  -
    name: sequence example 2
    debug: var=item
    with_sequence: start=3 end=1 stride=-1 format=%08d

予測はつくでしょーが、以下のような出力が得られます。

PLAY [join and sequence example] *********************************************************************

TASK [join example] **********************************************************************************
ok: [localhost] =>
  msg: foo, bar, baz

TASK [sequence example] ******************************************************************************
ok: [localhost] => (item=1) =>
  msg: count 01
ok: [localhost] => (item=2) =>
  msg: count 02
ok: [localhost] => (item=3) =>
  msg: count 03
ok: [localhost] => (item=4) =>
  msg: count 04

TASK [sequence example 2] ****************************************************************************
ok: [localhost] => (item=00000003) =>
  ansible_loop_var: item
  item: '00000003'
ok: [localhost] => (item=00000002) =>
  ansible_loop_var: item
  item: '00000002'
ok: [localhost] => (item=00000001) =>
  ansible_loop_var: item
  item: '00000001'

PLAY RECAP *******************************************************************************************
localhost                  : ok=3    changed=0    unreachable=0    failed=0    skipped=0    rescued=0   ignored=0

詳しくは Jinja2のドキュメントなどを参照

• Template Designer Documentation — Jinja Documentation (2.11.x)
• sequence – generate a list based on a number sequence — Ansible Documentation