如何将 Ansible 模块 wait_for 与循环一起使用? [英] How to use Ansible module wait_for together with loop?

问题描述

在 Ansible 2.7.11 中并想使用模块 waif_for 与 loops 一起用于连接测试到我的 System Center Operations Manager (SCOM) 服务器.

In Ansible 2.7.11 and wanted to use the module waif_for together with loops for connection test to my System Center Operations Manager (SCOM) servers.

目前我正在使用一个任务

Currently I'm using a task

- name: "Test connection to SCOM_MGMT_SRV_PROD: {{ SCOM_MGMT_SRV_PROD }}"
  wait_for:
    host: "{{ item }}"
    port: "{{ SCOM_PORT }}"
    state: drained         # Port should be open
    delay: 0               # No wait before first check (sec)
    timeout: 3             # Stop checking after timeout (sec)
    active_connection_states: SYN_RECV
  with_items:
    - server1
    - server2
    - server3
    - server4
  ignore_errors: yes
  tags: connectionTest,testSCOM

其中变量 SCOM_PORT 设置为 1270，SCOM_MGMT_SRV_PROD 设置为服务器列表 "server1,server2,server3,server4".

where the variable SCOM_PORT is set to 1270 and SCOM_MGMT_SRV_PROD to a list of servers "server1,server2,server3,server4".

这种方法有效，但我希望在一个中心位置维护一个服务器变量列表，就像库存文件中的全局变量 SCOM_MGMT_SRV_PROD.

This approach is working but I wanted to have a variable list of servers maintained at a central place, like a global variable SCOM_MGMT_SRV_PROD in inventory file.

可以通过

- debug:
    msg="{{ item }}"
  loop: "{{ [SCOM_MGMT_SRV_PROD] }}"

但是在任务中使用这种方法时

but when using this approach in the task

- name: "Test connection to SCOM_MGMT_SRV_PROD: {{ SCOM_MGMT_SRV_PROD }}"
  wait_for:
    host: "{{ item }}"
    port: "{{ SCOM_PORT }}"
    state: drained         # Port should be open
    delay: 0               # No wait before first check (sec)
    timeout: 3             # Stop checking after timeout (sec)
    active_connection_states: SYN_RECV
  loop: "{{ [SCOM_MGMT_SRV_PROD] }}"
  ignore_errors: yes
  tags: connectionTest,testSCOM

我收到一个错误

failed: [host] (item=server1,server2,server3,server4) => ... /tmp/ansible_wait_for_payload_zNj2ac/__main__.py\", line 380, in _convert_host_to_hex\r\n  File \"/tmp/ansible_wait_for_payload_zNj2ac/__main__.py\", line 354, in _convert_host_to_ip\r\nsocket.gaierror: [Errno -2] Name or service not known\r\n", "msg": "MODULE FAILURE\nSee stdout/stderr for the exact error", "rc": 1}

这对我来说表明模块 wait_for 将完整列表作为项目而不是列表中的一台服务器.所描述行为的原因似乎得到了回答@在特定主机组中检查 Ansible 中的 wait_for 不起作用.

which for me indicates that the module wait_for got the full list as item instead of one server from the list. The reason for the described behavior seems to be answered @Checking wait_for in Ansible in a particular host group does not work.

知道如何让 wait_for 模块与服务器的变量列表一起工作吗?

Any idea how to get the module wait_for working with a variable list of servers?

其他组件

• RHEL 7.6
• python 版本 = 2.7.5(默认，2019 年 6 月 11 日，12:19:05)[GCC 4.8.5 20150623 (Red Hat 4.8.5-36)]
• 模块 dig 已安装，但未使用它不会与 lookup
一起改变行为

• RHEL 7.6
• python version = 2.7.5 (default, Jun 11 2019, 12:19:05) [GCC 4.8.5 20150623 (Red Hat 4.8.5-36)]
• Module dig is installed, but not used since it doesn't change the behavior together with lookup

推荐答案

与同事协商后发现清单中的(服务器)列表没有正确定义，只是一个经典的语法错误.请参阅Ansible，如何在主机清单中定义列表?.

After consulting with colleagues it turned out that the list (of servers) wasn't defined correctly in inventory, just a classical syntax error. Please see Ansible, how to define a list in host inventory?.

要使其工作，必须在清单文件中将变量定义为

To get it working it is necessary to define in inventory file the variable as

SCOM_MGMT_SRV_PROD="['server1','server2','server3','server4']"

而不是逗号分隔的字符串列表并使用 for 循环

instead of an just comma separated list of strings and use for loop

loop: "{{ SCOM_MGMT_SRV_PROD }}"

通过这样做，我意识到实际上调试消息也没有遍历列表.现在它工作正常

By doing this I've realized that actually the debug message wasn't iterating over the list either. Now it is working properly

TASK [debug] ************************************************************************************************************************
ok: [host] => (item=server1) => {
    "msg": "server1"
}
ok: [host] => (item=server2) => {
    "msg": "server2"
}
ok: [host] => (item=server3) => {
    "msg": "server3"
}
ok: [host] => (item=server4) => {
    "msg": "server4"
}

TASK [Test connection to SCOM_MGMT_SRV_PROD: ['server1','server2','server3','server4']] ***
ok: [host] => (item=server1)
ok: [host] => (item=server2)
ok: [host] => (item=server3)
ok: [host] => (item=server4)

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