我有一个示例剧本在其中，我使用with_nested从两个ansible变量匹配主机。这两个变量采用json格式。记录正确匹配。但是由于ansible 2.x的变化，它在寄存器变量中显示匹配和不匹配的记录。
---
- hosts: 127.0.0.1
connection: local
tasks:
- shell: "echo {{ item[0] }}"
with_nested:
- [{"host": "host1","description": "This is host1 server"}, {"host": "host2","description": "This is host2 server"}]
- [{"host_name": "host1"},{"host_name": "host2"},{"host_name": "host3"},{"host_name":"host4"}]
register: all_hosts
when: item[0].host == item[1].host_name
- debug: var=all_hosts.results
all_hosts
"all_hosts.results": [
{
"_ansible_no_log": false,
"changed": true,
"cmd": "echo {u'host': u'host1', u'description': u'This is host1 server'}",
"delta": "0:00:00.005456",
"end": "2016-04-07 02:34:37.151824",
"invocation": {
"module_args": {
"_raw_params": "echo {u'host': u'host1', u'description': u'This is host1 server'}",
"_uses_shell": true,
"chdir": null,
"creates": null,
"executable": null,
"removes": null,
"warn": true
},
"module_name": "command"
},
"item": [
{
"description": "This is host1 server",
"host": "host1"
},
{
"host_name": "host1"
}
],
"rc": 0,
"start": "2016-04-07 02:34:37.146368",
"stderr": "",
"stdout": "{uhost: uhost1, udescription: uThis is host1 server}",
"stdout_lines": [
"{uhost: uhost1, udescription: uThis is host1 server}"
],
"warnings": []
},
{
"_ansible_no_log": false,
"changed": false,
"item": [
{
"description": "This is host1 server",
"host": "host1"
},
{
"host_name": "host2"
}
],
"skip_reason": "Conditional check failed",
"skipped": true
},
{
"_ansible_no_log": false,
"changed": false,
"item": [
{
"description": "This is host1 server",
"host": "host1"
},
{
"host_name": "host3"
}
],
"skip_reason": "Conditional check failed",
"skipped": true
},
{
"_ansible_no_log": false,
"changed": false,
"item": [
{
"description": "This is host1 server",
"host": "host1"
},
{
"host_name": "host4"
}
],
"skip_reason": "Conditional check failed",
"skipped": true
},
{
"_ansible_no_log": false,
"changed": false,
"item": [
{
"description": "This is host2 server",
"host": "host2"
},
{
"host_name": "host1"
}
],
"skip_reason": "Conditional check failed",
"skipped": true
},
{
"_ansible_no_log": false,
"changed": true,
"cmd": "echo {u'host': u'host2', u'description': u'This is host2 server'}",
"delta": "0:00:00.005470",
"end": "2016-04-07 02:34:37.310095",
"invocation": {
"module_args": {
"_raw_params": "echo {u'host': u'host2', u'description': u'This is host2 server'}",
"_uses_shell": true,
"chdir": null,
"creates": null,
"executable": null,
"removes": null,
"warn": true
},
"module_name": "command"
},
"item": [
{
"description": "This is host2 server",
"host": "host2"
},
{
"host_name": "host2"
}
],
"rc": 0,
"start": "2016-04-07 02:34:37.304625",
"stderr": "",
"stdout": "{uhost: uhost2, udescription: uThis is host2 server}",
"stdout_lines": [
"{uhost: uhost2, udescription: uThis is host2 server}"
],
"warnings": []
},
{
"_ansible_no_log": false,
"changed": false,
"item": [
{
"description": "This is host2 server",
"host": "host2"
},
{
"host_name": "host3"
}
],
"skip_reason": "Conditional check failed",
"skipped": true
},
{
"_ansible_no_log": false,
"changed": false,
"item": [
{
"description": "This is host2 server",
"host": "host2"
},
{
"host_name": "host4"
}
],
"skip_reason": "Conditional check failed",
"skipped": true
}
]
所以有两个匹配的记录。有没有办法计算这些匹配的记录？
东西
- debug: msg="Task if matching record count more than one"
when: all_hosts.changed | length > 0
答案 0 :(得分：1)
您真的需要计数还是想检查是否至少有一条匹配的记录？怎么样：
- debug: msg="Task if matching record count more than one"
when: all_hosts.changed