如何在没有模板错误的情况下正确使用 Ansible jinja2 map() 和 join() 过滤器？

Question

http://docs.ansible.com/ansible/playbooks_filters.html 网站上说我可以执行以下操作：

  # get a comma-separated list of the mount points (e.g. "/,/mnt/stuff") on a host
  {{ ansible_mounts|map(attribute='mount')|join(',') }}

我这样做的：

    - debug: var="{{ ansible_mounts|map(attribute='mount')|join(', ') }}"

这会导致以下每个错误...

 FAILED! => {"failed": true, "msg": "template error while templating string: unexpected '/'. String: {{/, /homedata, /edbdata, /db1data, /db2data}}"}

我是否遗漏了某种异常或默认语句？

打印出 ansible_mounts

   root@ip-10-200-241-204:/etc/ansible# ansible -u ubuntu -m setup 10.200.240.10 -a 'filter=ansible_mounts'
 10.200.240.10 | SUCCESS => {
       "ansible_facts": {
           "ansible_mounts": [
        {
            "device": "/dev/xvda1",
            "fstype": "ext4",
            "mount": "/",
            "options": "rw,noatime,data=ordered",
            "size_available": 7024513024,
            "size_total": 8318783488,
            "uuid": "35634654356"
        },
        {
            "device": "/dev/xvdb",
            "fstype": "xfs",
            "mount": "/homedata",
            "options": "rw,noatime,attr2,inode64,noquota",
            "size_available": 13914439680,
            "size_total": 13948157952,
            "uuid": "345634564356"
        },
        {
            "device": "/dev/xvdc",
            "fstype": "xfs",
            "mount": "/edbdata",
            "options": "rw,noatime,attr2,inode64,noquota",
            "size_available": 16061923328,
            "size_total": 16095641600,
            "uuid": "23452345235"
        },
        {
            "device": "/dev/xvdc",
            "fstype": "xfs",
            "mount": "/db1data",
            "options": "rw,noatime,attr2,inode64,noquota",
            "size_available": 16061923328,
            "size_total": 16095641600,
            "uuid": 234523452"
        },
        {
            "device": "/dev/xvdd",
            "fstype": "xfs",
            "mount": "/db2data",
            "options": "rw,noatime,attr2,inode64,noquota",
            "size_available": 16061923328,
            "size_total": 16095641600,
            "uuid": "23423452"
        }
    ]
},
"changed": false

}

Answer 1

在使用 var 时，ansible 2.2.0 中不需要花括号。试试这个：

- debug: var=ansible_mounts|map(attribute='mount')|join(', ')

注意在ansible 2.2.0中使用msg时需要花括号。试试这个：

- debug: msg={{ansible_mounts|map(attribute='mount')|join(', ')}}

如何在没有模板错误的情况下正确使用 Ansible jinja2 map() 和 join() 过滤器？

How do I use Ansible jinja2 map() and join() filters correctly without template error?

jinja2

amazon-web-services

ansible

ansible-playbook