使用ansible循环遍历多个字典列表

Question

我正试图使用ansible在以下变量结构上循环，我想要的是在每个子网上循环。对于子网-1，我想获得网络、cidr、vlan类似地循环其他密钥子网-2，个子网-3

flavor.json

{
"subnets-1": [
{
"network": "test1",
"cidr": 21,
"vlan": 123
},
{
"network": "test2",
"cidr": 22,
"vlan": 234
}
],
"subnets-2": [
{
"network": "test3",
"cidr": 43,
"vlan": 879
},
{
"network": "test4",
"cidr": 21,
"vlan": "12fsd"
},
{
"network": "test5",
"cidr": "22sdf",
"vlan": "234sdfd"
}
],
"subnets-3": [
{
"network": "test44",
"cidr": "fg",
"vlan": "dsfsd"
}
]
}

我使用with_dict 尝试了如下操作

playbook.yml(ansible 2.9.7(

---
- hosts: local
gather_facts: no  
tasks:
- name: lookup yaml
set_fact:
flavors: "{{ lookup('file','flavor.json') | from_json }}"
- name: json out
debug:
msg: "{{ flavors }}"
- name: check keys
shell: |
echo "s_name = {{ item.network }}"
echo "s_cidr = {{ item.cidr }}"
echo "s_vlan = {{ item.vlan }}"
with_dict:
"{{ flavors }}"

这是我在执行时遇到的错误

错误：

fatal: [192.168.110.128]: FAILED! => {
"msg": "The task includes an option with an undefined variable. The error was: 'dict object' has no attribute 'network'nnThe error appears to be in '/root/fla.yml': line 19, column 5, but maynbe elsewhere in the file depending on the exact syntax problem.nnThe offending line appears to be:nnn  - name: check keysn    ^ heren"
}

Answer 1

使用include_vars。与查找和from _yaml相比，它更简单，例如

- include_vars:
file: flavor.json
name: flavors

给出

flavors:
subnets-1:
- {cidr: 21, network: test1, vlan: 123}
- {cidr: 22, network: test2, vlan: 234}
subnets-2:
- {cidr: 43, network: test3, vlan: 879}
- {cidr: 21, network: test4, vlan: 12fsd}
- {cidr: 22sdf, network: test5, vlan: 234sdfd}
subnets-3:
- {cidr: fg, network: test44, vlan: dsfsd}

然后将字典转换为列表，并使用_subelements迭代，例如

- debug:
msg: "{{ item.0.key }}
{{ item.1.network }}
{{ item.1.cidr }}
{{ item.1.vlan }}"
with_subelements:
- "{{ flavors|dict2items }}"
- value

给出

msg: subnets-1 test1 21 123
msg: subnets-1 test2 22 234
msg: subnets-2 test3 43 879
msg: subnets-2 test4 21 12fsd
msg: subnets-2 test5 22sdf 234sdfd
msg: subnets-3 test44 fg dsfsd

Answer 2

Ansible不能很好地执行嵌套循环。在这种情况下，您知道最多有三个数组元素。所以你可以这样循环：

- name: loop over flavors
debug:
msg: "{{ flavors[item.0][item.1] }}"
with_nested:
- "{{ flavors }}"
- [ 0, 1, 2 ]
when: flavors[item.0][item.1] is defined

结果是这样的：

TASK [loop over flavors] *********************************************************************************************
ok: [localhost] => (item=['subnets-1', 0]) => {
"msg": {
"cidr": 21,
"network": "test1",
"vlan": 123
}
}
ok: [localhost] => (item=['subnets-1', 1]) => {
"msg": {
"cidr": 22,
"network": "test2",
"vlan": 234
}
}
skipping: [localhost] => (item=['subnets-1', 2]) 
ok: [localhost] => (item=['subnets-2', 0]) => {
"msg": {
"cidr": 43,
"network": "test3",
"vlan": 879
}
}
ok: [localhost] => (item=['subnets-2', 1]) => {
"msg": {
"cidr": 21,
"network": "test4",
"vlan": "12fsd"
}
}
ok: [localhost] => (item=['subnets-2', 2]) => {
"msg": {
"cidr": "22sdf",
"network": "test5",
"vlan": "234sdfd"
}
}
ok: [localhost] => (item=['subnets-3', 0]) => {
"msg": {
"cidr": "fg",
"network": "test44",
"vlan": "dsfsd"
}
}
skipping: [localhost] => (item=['subnets-3', 1]) 
skipping: [localhost] => (item=['subnets-3', 2])