ansible：ansible_ssh_user 覆盖组中主机的值

Question

我有一个清单文件，其中包含多个 hosts.But 的不同登录信息，同时在剧本中调用 ansible_ssh_user 值时我只得到最后一个条目。

为什么它需要最后一个条目 ansible_ssh_user？

库存文件：

[local]
10.41.42.2 ansible_ssh_user=root ansible_ssh_pass=root123

[DSC_root]
10.41.42.2  ansible_ssh_user=root ansible_ssh_pass=root123
10.41.42.70 ansible_ssh_user=root ansible_ssh_pass=root
10.41.42.71 ansible_ssh_user=root ansible_ssh_pass=root

[DSC_admin]
10.41.42.2  ansible_ssh_user=root ansible_ssh_pass=root123
10.41.42.70 ansible_ssh_user=dscadmin ansible_ssh_pass=dscadmin
10.41.42.71 ansible_ssh_user=dscadmin ansible_ssh_pass=dscadmin

剧本：

---
- hosts: DSC_root 
  remote_user: root
  tasks:
- name: get root user home grep and register
  shell: >
         grep "^{{ansible_ssh_user}}:" /etc/passwd | awk -F: '{ print  }'
  changed_when: false
  register: v_getuserhome
- debug: var=v_getuserhome

日志：

    [root@mavosdsc ansible]# ansible-playbook -i inventory1 get_home.yml

    PLAY [DSC_root] ****************************************************************

    TASK [setup] *******************************************************************
    ok: [10.41.42.71]
    ok: [10.41.42.70]
    ok: [10.41.42.2]

    TASK [get root user home grep and register] ************************************
    ok: [10.41.42.70]
    ok: [10.41.42.71]
    ok: [10.41.42.2]

    TASK [debug] *******************************************************************
    ok: [10.41.42.70] => {
        "v_getuserhome": {
            "changed": false, 
            "cmd": "grep \"^dscadmin:\" /etc/passwd | awk -F: '{ print  }'", 
            "delta": "0:00:00.005985", 
            "end": "2016-07-31 09:23:42.743393", 
            "rc": 0, 
            "start": "2016-07-31 09:23:42.737408", 
            "stderr": "", 
            "stdout": "/home/dscadmin", 
            "stdout_lines": [
                "/home/dscadmin"
            ], 
            "warnings": []
        }
    }
    ok: [10.41.42.2] => {
        "v_getuserhome": {
            "changed": false, 
            "cmd": "grep \"^root:\" /etc/passwd | awk -F: '{ print  }'", 
            "delta": "0:00:00.005801", 
            "end": "2016-07-31 18:53:44.074155", 
            "rc": 0, 
            "start": "2016-07-31 18:53:44.068354", 
            "stderr": "", 
            "stdout": "/root", 
            "stdout_lines": [
                "/root"
            ], 
            "warnings": []
        }
    }
    ok: [10.41.42.71] => {
        "v_getuserhome": {
            "changed": false, 
            "cmd": "grep \"^dscadmin:\" /etc/passwd | awk -F: '{ print  }'", 
            "delta": "0:00:00.006740", 
            "end": "2016-07-31 09:23:43.347801", 
            "rc": 0, 
            "start": "2016-07-31 09:23:43.341061", 
            "stderr": "", 
            "stdout": "/home/dscadmin", 
            "stdout_lines": [
                "/home/dscadmin"
            ], 
            "warnings": []
        }
    }

    PLAY RECAP *********************************************************************
    10.41.42.2                : ok=3    changed=0    unreachable=0    failed=0   
    10.41.42.70               : ok=3    changed=0    unreachable=0    failed=0   
    10.41.42.71               : ok=3    changed=0    unreachable=0    failed=0

Answer 1

实际上，ansible 就是这样工作的。当你运行你的剧本时； ansible-playbook -i inventory my_playbook.yml ，ansible 会按照您指定的顺序读取您在那里定义的主机及其变量。如果它遇到稍后在另一组中定义的同一主机的相同变量，即使在您的游戏中您瞄准了在清单顶部定义的一组主机，也会使用最后一个变量。

ansible：ansible_ssh_user 覆盖组中主机的值

ansible: ansible_ssh_user Overriding values for hosts in a group

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