ansible使用7-Loops
Standard Loops
with_items
- name: add several users
user: name={{ item }} state=present groups=wheel
with_items:
- testuser1
- testuser2
#
with_items: somelist
- name: add several users
user: name={{ item.name }} state=present groups={{ item.groups }}
with_items:
- { name: 'testuser1', groups: 'wheel' }
- { name: 'testuser2', groups: 'root' }
Nested Loops(with_nested)
- name: give users access to multiple databases
mysql_user: name={{ item[0] }} priv={{ item[1] }}.*:ALL append_privs=yes password=foo
with_nested:
- [ 'alice', 'bob' ]
- [ 'clientdb', 'employeedb', 'providerdb' ]
- name: here, 'users' contains the above list of employees
mysql_user: name={{ item[0] }} priv={{ item[1] }}.*:ALL append_privs=yes password=foo
with_nested:
- users
- [ 'clientdb', 'employeedb', 'providerdb' ]
Looping over Hashes(with_dict)
---
users:
alice:
name: Alice Appleworth
telephone: 123-456-7890
bob:
name: Bob Bananarama
telephone: 987-654-3210
tasks:
- name: Print phone records
debug: msg="User {{ item.key }} is {{ item.value.name }} ({{ item.value.telephone }})"
with_dict: users
Looping over Fileglobs(with_fileglob)
---
- hosts: all
tasks:
# first ensure our target directory exists
- file: dest=/etc/fooapp state=directory
# copy each file over that matches the given pattern
- copy: src={{ item }} dest=/etc/fooapp/ owner=root mode=600
with_fileglob:
- /playbooks/files/fooapp/*
Looping over Parallel Sets of Data
---
alpha: [ 'a', 'b', 'c', 'd' ]
numbers: [ 1, 2, 3, 4 ]
tasks:
- debug: msg="{{ item.0 }} and {{ item.1 }}"
with_together:
- alpha
- numbers
# ('a',1), ('b',2), ('c',3)
Looping over Subelements(with_subelements)
# group_vars/all
---
users:
- name: alice
authorized:
- /tmp/alice/onekey.pub
- /tmp/alice/twokey.pub
- name: bob
authorized:
- /tmp/bob/id_rsa.pub
- user: name={{ item.name }} state=present generate_ssh_key=yes
with_items: users
- authorized_key: "user={{ item.0.name }} key='{{ lookup('file', item.1) }}'"
with_subelements:
- users
- authorized
Looping over Integer Sequences(with_sequence)
---
- hosts: all
tasks:
# create groups
- group: name=evens state=present
- group: name=odds state=present
# create some test users
- user: name={{ item }} state=present groups=evens
with_sequence: start=0 end=32 format=testuserx
# create a series of directories with even numbers for some reason
- file: dest=/var/stuff/{{ item }} state=directory
with_sequence: start=4 end=16 stride=2
# a simpler way to use the sequence plugin
# create 4 groups
- group: name=group{{ item }} state=present
with_sequence: count=4
Random Choices(with_random_choice)
- debug: msg={{ item }}
with_random_choice:
- "go through the door"
- "drink from the goblet"
- "press the red button"
- "do nothing"
Do-Until Loops
- action: shell /usr/bin/foo
register: result
until: result.stdout.find("all systems go") != -1
retries: 5
delay: 10
# retried for 5 times with a delay of 10 seconds
Finding First Matched Files(with_first_found)
- name: INTERFACES | Create Ansible header for /etc/network/interfaces
template: src={{ item }} dest=/etc/foo.conf
with_first_found:
- "{{ansible_virtualization_type}}_foo.conf"
- "default_foo.conf"
- name: some configuration template
template: src={{ item }} dest=/etc/file.cfg mode=0444 owner=root group=root
with_first_found:
- files:
- "{{inventory_hostname}}/etc/file.cfg"
paths:
- ../../../templates.overwrites
- ../../../templates
- files:
- etc/file.cfg
paths:
- templates
Iterating Over The Results of a Program Execution(with_lines)
- name: Example of looping over a command result
shell: /usr/bin/frobnicate {{ item }}
with_lines: /usr/bin/frobnications_per_host --param {{ inventory_hostname }}
- name: Example of looping over a REMOTE command result
shell: /usr/bin/something
register: command_result
- name: Do something with each result
shell: /usr/bin/something_else --param {{ item }}
with_items: command_result.stdout_lines
Looping Over A List With An Index(with_indexed_items)
- name: indexed loop demo
debug: msg="at array position {{ item.0 }} there is a value {{ item.1 }}"
with_indexed_items: some_list
Flattening A List
# file: roles/foo/vars/main.yml
packages_base:
- [ 'foo-package', 'bar-package' ]
packages_apps:
- [ ['one-package', 'two-package' ]]
- [ ['red-package'], ['blue-package']]
to
- name: flattened loop demo
yum: name={{ item }} state=installed
with_flattened:
- packages_base
- packages_apps
Using register with a loop
- shell: echo "{{ item }}"
with_items:
- one
- two
register: echo
{
"changed": true,
"msg": "All items completed",
"results": [
{
"changed": true,
"cmd": "echo \"one\" ",
"delta": "0:00:00.003110",
"end": "2013-12-19 12:00:05.187153",
"invocation": {
"module_args": "echo \"one\"",
"module_name": "shell"
},
"item": "one",
"rc": 0,
"start": "2013-12-19 12:00:05.184043",
"stderr": "",
"stdout": "one"
},
{
"changed": true,
"cmd": "echo \"two\" ",
"delta": "0:00:00.002920",
"end": "2013-12-19 12:00:05.245502",
"invocation": {
"module_args": "echo \"two\"",
"module_name": "shell"
},
"item": "two",
"rc": 0,
"start": "2013-12-19 12:00:05.242582",
"stderr": "",
"stdout": "two"
}
]
}
- name: Fail if return code is not 0
fail:
msg: "The command ({{ item.cmd }}) did not have a 0 return code"
when: item.rc != 0
with_items: echo.results
posted on
2015-01-04 15:29
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转载于:https://www.cnblogs.com/liujitao79/p/4201259.html
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