Question

我正在使用ansible来读取安装在我的redhat主机上的RPM的列表，并且还想指定一种格式。如何在命令字符串中转义单个大括号？

- hosts: localhost
  gather_facts: no
  tasks:
  - name: rpm -qa
    command: rpm -qa --qf "{NAME}: %{VERSION}\n" | sort
    register: rpmout

  - debug:
      msg: Your rpms are {{ rpmout.stdout }}

运行上述剧本的输出：

$ ansible-playbook -vvv ./a.yml 
ansible-playbook 2.7.10
  config file = None
  configured module search path = [u'/home/ansible/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible-playbook
  python version = 2.7.5 (default, Apr  9 2019, 14:30:50) [GCC 4.8.5 20150623 (Red Hat 4.8.5-36)]
No config file found; using defaults
/etc/ansible/hosts did not meet host_list requirements, check plugin documentation if this is unexpected
/etc/ansible/hosts did not meet script requirements, check plugin documentation if this is unexpected
Parsed /etc/ansible/hosts inventory source with ini plugin
ERROR! Syntax Error while loading YAML.
  mapping values are not allowed in this context

The error appears to have been in '/home/ansible/a.yml': line 5, column 34, but may
be elsewhere in the file depending on the exact syntax problem.

The offending line appears to be:

  - name: rpm -qa
    command: rpm -qa --qf "{NAME}: %{VERSION}\n" | sort
                                 ^ here

Answer 1

要“混淆” YAML解析器，您需要将整个字符串放在单引号中：

command: 'rpm -qa --qf "{NAME}: %{VERSION}\n" | sort'

或者如果您需要换行符：

command: |
    rpm -qa --qf "{NAME}: %{VERSION}
    " | sort

将单个花括号转义为ansible变量

1 个答案: