Ansible：通过迭代注册和显示结果

我的剧本是

---
- name: Running Checks on ACTIVATION VMs of ECM
  hosts: activationvms
  tasks:
   - name: Checking File System status
     shell: df -PTh
     register: filesystem_check
   - name: Display File System Statistics
     debug:
      msg: "{{ filesystem_check.stdout_lines }}"
   - name: Check the status of list of services
     shell: systemctl list-units|grep "{{ item }}"|awk '{ print $1,$2,$3,$4}'
     with_items:
     - zookeeper.service
     - cassandra.service
     register: service_status
   - name: Display services status
     debug:
      msg: "{{ item.stdout }}"
     with_items: "{{ service_status.results }}"

我想把结果缩小到只有msg行

ok: [10.142.6.79] => (item={u'_ansible_parsed': True, u'changed': True, u'stdout': u'cassandra.service loaded active running', u'_ansible_no_log': False, u'stdout_lines': [u'cassandra.service loaded active running'], u'warnings': [], u'_ansible_item_result': True, u'start': u'2019-11-15 07:50:39.047456', u'delta': u'0:00:00.011821', u'cmd': u'systemctl list-units|grep "cassandra.service"|awk \'{ print $1,$2,$3,$4}\'', u'item': u'cassandra.service', u'rc': 0, u'invocation': {u'module_name': u'command', u'module_args': {u'warn': True, u'executable': None, u'_uses_shell': True, u'_raw_params': u'systemctl list-units|grep "cassandra.service"|awk \'{ print $1,$2,$3,$4}\'', u'removes': None, u'creates': None, u'chdir': None}}, u'end': u'2019-11-15 07:50:39.059277', u'stderr': u''}) => {
    "item": {
        "changed": true,
        "cmd": "systemctl list-units|grep \"cassandra.service\"|awk '{ print $1,$2,$3,$4}'",
        "delta": "0:00:00.011821",
        "end": "2019-11-15 07:50:39.059277",
        "invocation": {
            "module_args": {
                "_raw_params": "systemctl list-units|grep \"cassandra.service\"|awk '{ print $1,$2,$3,$4}'",
                "_uses_shell": true,
                "chdir": null,
                "creates": null,
                "executable": null,
                "removes": null,
                "warn": true
            },
            "module_name": "command"
        },
        "item": "cassandra.service",
        "rc": 0,
        "start": "2019-11-15 07:50:39.047456",
        "stderr": "",
        "stdout": "cassandra.service loaded active running",
        "stdout_lines": [
            "cassandra.service loaded active running"
        ],
        "warnings": []
    },
    "msg": "cassandra.service loaded active running"
}
ok: [10.142.6.72] => (item={u'_ansible_parsed': True, u'changed': True, u'stdout': u'cassandra.service loaded active running', u'_ansible_no_log': False, u'stdout_lines': [u'cassandra.service loaded active running'], u'warnings': [], u'_ansible_item_result': True, u'start': u'2019-11-15 07:50:39.429296', u'delta': u'0:00:00.011853', u'cmd': u'systemctl list-units|grep "cassandra.service"|awk \'{ print $1,$2,$3,$4}\'', u'item': u'cassandra.service', u'rc': 0, u'invocation': {u'module_name': u'command', u'module_args': {u'warn': True, u'executable': None, u'_uses_shell': True, u'_raw_params': u'systemctl list-units|grep "cassandra.service"|awk \'{ print $1,$2,$3,$4}\'', u'removes': None, u'creates': None, u'chdir': None}}, u'end': u'2019-11-15 07:50:39.441149', u'stderr': u''}) => {
    "item": {
        "changed": true,
        "cmd": "systemctl list-units|grep \"cassandra.service\"|awk '{ print $1,$2,$3,$4}'",
        "delta": "0:00:00.011853",
        "end": "2019-11-15 07:50:39.441149",
        "invocation": {
            "module_args": {
                "_raw_params": "systemctl list-units|grep \"cassandra.service\"|awk '{ print $1,$2,$3,$4}'",
                "_uses_shell": true,
                "chdir": null,
                "creates": null,
                "executable": null,
                "removes": null,
                "warn": true
            },
            "module_name": "command"
        },
        "item": "cassandra.service",
        "rc": 0,
        "start": "2019-11-15 07:50:39.429296",
        "stderr": "",
        "stdout": "cassandra.service loaded active running",
        "stdout_lines": [
            "cassandra.service loaded active running"
        ],
        "warnings": []
    },
    "msg": "cassandra.service loaded active running"

---

您需要使用循环控制工具。像这样重写你的上一部剧本

- name: Display services status
  debug:
   msg: "{{ item.stdout }}"
  with_items: "{{ service_status.results }}"
  loop_control:
    label: "{{ item.item }}"

---

这会将输出限制为仅迭代到先前命令中的内容，以便您可以知道当前处于循环的哪一部分。

您遇到了什么样的错误？我只是在本地运行了它，它起了作用，所以共享错误可能会帮助我了解问题所在。这个循环控制：{item.item}和标签{{item.item}}只在Ansible的更高版本上起作用吗？？我使用2.1.1.0。我没有得到任何错误，但结果是相同的。有问题的行似乎是：loop_control:label:“{{item.item}}”^这里我们可能是错的，但这一行看起来可能是缺少引号的问题。当模板表达式括号开始一个值时，始终引用它们。例如：with_items:-{{foo}}应该写为：with_items:-“{{foo}”我认为您在版本问题上是正确的。这是在2.7版本上测试的。我对2.1没有任何经验，所以我很难说出这两个版本之间的区别。