Ansible 在标准输出输出中搜索子字符串答案

【问题标题】：Ansible search for a substring in stdout outputAnsible 在标准输出输出中搜索子字符串
【发布时间】：2019-12-05 02:16:48
【问题描述】：

团队，我正在尝试匹配一个版本，但当整个字符串不匹配时会失败。所以我只想匹配前两个八位字节。我尝试了几个组合，但没有运气。

      - name: "Validate k8s version"
        shell: "kubectl version --short"
        register: k8s_version_live
        failed_when: k8s_version_live.stdout_lines is not search("{{ k8s_server_version }}")
        #failed_when: "'{{ k8s_server_version }}' not in k8s_version_live.stdout_lines"
        ignore_errors: yes
      - debug:
          var: k8s_version_live.stdout_lines

输出：


[WARNING]: conditional statements should not include jinja2 templating delimiters such as {{ }} or {% %}. Found: k8s_version_live.stdout_lines is not search("{{
k8s_server_version }}")

fatal: [localhost]: FAILED! => {"changed": true, "cmd": "kubectl version --short", "delta": "0:00:00.418128", "end": "2019-12-05 02:13:15.108997", "failed_when_result": true, "rc": 0, "start": "2019-12-05 02:13:14.690869", "stderr": "", "stderr_lines": [], "stdout": "Client Version: v1.13.3\nServer Version: v1.13.10", "stdout_lines": ["Client Version: v1.13.3", "Server Version: v1.13.10"]}
...ignoring

TASK [team-services-pre-install-checks : debug] *************************************************************************************************************************
Thursday 05 December 2019  02:13:15 +0000 (0:00:00.902)       0:00:01.039 *****
ok: [localhost] => {
    "k8s_version_live.stdout_lines": [
        "Client Version: v1.13.3",
        "Server Version: v1.13.10"
    ]
}```

【问题讨论】：

标签： ansible ansible-2.x ansible-facts

【解决方案1】：

问："匹配一个版本...匹配前两个八位字节"

答：使用Version Comparison。例如，从注册的输出中创建变量 k8s_server_version

- set_fact:
    k8s_server_version: "{{ k8s_version_live.stdout_lines.1.split(':').1[2:] }}"

比较版本的前两个数字

- debug:
    msg: "{{ k8s_server_version }} match 1.13"
  when:
    - k8s_server_version is version('1.13', '>=')
    - k8s_server_version is version('1.14', '<')

给予

    }
    localhost | SUCCESS => {
        "msg": "1.13.10 match 1.13"
    }

版本不匹配时失败

- fail:
    msg: "{{ k8s_server_version }} does not match 1.12"
  when: not (k8s_server_version is version('1.12', '>=') and
             k8s_server_version is version('1.13', '<'))

给予

    localhost | FAILED! => {
        "changed": false, 
        "msg": "1.13.10 does not match 1.12"
    }

【讨论】：

【解决方案2】：

正如错误所说：

条件语句不应包含 jinja2 模板分隔符，例如 {{ }} 或 {% %}。

在条件语句中，您已经在 Jinja 模板上下文中。您可以只按名称引用变量：

- name: "Validate k8s version"
  shell: "kubectl version --short"
  register: k8s_version_live
  failed_when: k8s_version_live.stdout_lines is not search(k8s_server_version)
  ignore_errors: yes

虽然您可能想要k8s_version_live.stdout 而不是k8s_version_live.stdout_lines。

我可能会把任务写成：

- name: "Validate k8s version"
  command: "kubectl version --short"
  register: k8s_version_live
  failed_when: k8s_server_version not in k8s_version_live.stdout
  ignore_errors: true

【讨论】：