Question

此任务集合并不像我希望的那样工作：

- name: Find out whether syslog-ng is installed (yum)
  tags: syslog_forwarding
  command: yum -q list installed syslog-ng
  register: syslog_ng_check
  failed_when: False
  changed_when: False
  when: ansible_pkg_mgr == 'yum'

- name: Find out whether syslog-ng is installed (apt)
  tags: syslog_forwarding
  command: dpkg -s syslog-ng
  register: syslog_ng_check
  failed_when: False
  changed_when: False
  when: ansible_pkg_mgr == 'apt'

- name: Configure syslog-ng to forward all logs to syslog servers (apt)
  tags: syslog_forwarding
  template:
    src: syslog_ng_forward_all.conf.j2
    dest: /etc/syslog-ng/conf.d/syslog_forward.conf
  notify: restart syslog_ng
  when: syslog_ng_check is defined and syslog_ng_check.rc == 0

- name: Configure syslog-ng to forward all logs to syslog servers (yum)
  tags: syslog_forwarding
  template:
    src: syslog_ng_forward_all.conf.j2
    dest: /etc/syslog-ng/conf.d/syslog_forward.conf
  notify: restart syslog_ng
  when: syslog_ng_check is defined and syslog_ng_check.rc == 0

我想先了解系统上是否安装了syslog-ng（系统可能是CentOS还是Debian/Ubuntu），然后采取相应措施（放置配置文件））当这样时，并保持任务独立配置文件分发。我发现如果第一个任务实际返回0并将syslog-ng-check.rc设置为0，那么第二个任务会使其再次未定义（或至少为空），即使任务被跳过（因为没有）系统可以同时使用yum和apt，至少不是我的。）

当然，我可以为每个yum和apt检查注册不同的变量，但是在我的when：子句中我需要更多的逻辑，这是我想要避免的。

关于这个的任何好主意？

Answer 1

只有解决方法。跳过的任务将始终覆盖已注册的变量。

一种可能的方式：

- name: Find out whether syslog-ng is installed (yum)
  tags: syslog_forwarding
  command: yum -q list installed syslog-ng
  register: syslog_ng_check
  failed_when: False
  changed_when: False
  when: ansible_pkg_mgr == 'yum'

- set_fact:
    syslog_ng_flag: True
  when: syslog_ng_check.rc == 0

- name: Find out whether syslog-ng is installed (apt)
  tags: syslog_forwarding
  command: dpkg -s syslog-ng
  register: syslog_ng_check
  failed_when: False
  changed_when: False
  when: ansible_pkg_mgr == 'apt'

- set_fact:
    syslog_ng_flag: True
  when: syslog_ng_check.rc == 0

- name: Configure syslog-ng to forward all logs to syslog servers (apt)
  tags: syslog_forwarding
  template:
    src: syslog_ng_forward_all.conf.j2
    dest: /etc/syslog-ng/conf.d/syslog_forward.conf
  notify: restart syslog_ng
  when: syslog_ng_flag | default(false)

Answer 2

为什么不稍微重新排序你的任务，使你的“配置”任务立即跟随测试（“找出...”）成对，即：

- name: Find out whether syslog-ng is installed (yum)
- name: Configure syslog-ng to forward all logs to syslog servers (yum)
- name: Find out whether syslog-ng is installed (yum)
- name: Configure syslog-ng to forward all logs to syslog servers (apt)

这样即使其他测试重置syslog_ng_check，你也不在乎，因为你已经使用过了。

在由when: ansible_pkg_mgr == ...保护的块中为两个pkg管理器中的每一个放置查找/配置对将是另一种方式，并且将使订单/分组更重要。

如何在一个或另一个任务中注册var

2 个答案: