accessing inventory host variable in ansible playbook

问题

I am using ansible 2.1. I have the following inventory host file and a role being called by a play that needs access to the host file variable. Any thoughts on how to access it (currently getting an error):

host file

[test1]
test-1 ansible_ssh_host=abc.def.ghi.jkl ansible_ssh_port=1212

[test2]
test2-1 ansible_ssh_host=abc.def.ghi.mno ansible_ssh_port=1212

[test3]
test3-1 ansible_ssh_host=abc.def.ghi.pqr ansible_ssh_port=1212
test3-2 ansible_ssh_host=abc.def.ghi.stu ansible_ssh_port=1212

[all:children]
test1
test2
test3

role I have tried accessing the role in the following fashions:

{{ hostvars.ansible_ssh_host }} 

&&

{{ hostvars.test1.ansible_ssh_host }}

I am trying to access the ansible_ssh_host in the test1 section.

Error

fatal: [localhost]: FAILED! => {"failed": true, "msg": "'ansible.vars.hostvars.HostVars object' has no attribute 'ansible'"}

回答1:

You are on the right track about hostvars.
This magic variable is used to access information about other hosts.

hostvars is a hash with inventory hostnames as keys.
To access fields of each host, use hostvars['test-1'], hostvars['test2-1'], etc.

ansible_ssh_host is deprecated in favor of ansible_host since 2.0.
So you should first remove "_ssh" from inventory hosts arguments (i.e. to become "ansible_user", "ansible_host", and "ansible_port"), then in your role call it with:

{{ hostvars['your_host_group'].ansible_host }}

回答2:

[host_group]
host-1 ansible_ssh_host=192.168.0.21 node_name=foo
host-2 ansible_ssh_host=192.168.0.22 node_name=bar

[host_group:vars]
custom_var=asdasdasd

You can access host group vars using:

{{ hostvars['host_group'].custom_var }}

If you need a specific value from specific host, you can use:

{{ hostvars[groups['host_group'][0]].node_name }}

回答3:

You should be able to use the variable name directly

ansible_ssh_host

Or you can go through hostvars without having to specify the host literally by using the magic variable inventory_hostname

hostvars[inventory_hostname].ansible_ssh_host

回答4:

I struggled with this, too. My specific setup is: Your host.ini (with the modern names):

[test3]
test3-1 ansible_host=abc.def.ghi.pqr ansible_port=1212
test3-2 ansible_host=abc.def.ghi.stu ansible_port=1212

plus a play fill_file.yml

---
- remote_user: ec2-user
  hosts: test3
  tasks:
   - name: fill file
     template:
       src: file.j2
       dest: filled_file.txt

plus a template file.j2 , like

{% for host in groups['test3'] %}
   {{ hostvars[host].ansible_host }}
{% endfor %}

This worked for me, the result is

abc.def.ghi.pqr
abc.def.ghi.stu

I have to admit it's ansible 2.7, not 2.1. The template is a variation of an example in https://docs.ansible.com/ansible/latest/user_guide/playbooks_variables.html.

The accepted answer didn't work in my setup. With a template

{{ hostvars['test3'].ansible_host }}

my play fails with "AnsibleUndefinedVariable: \"hostvars['test3']\" is undefined" .

Remark: I tried some variations, but failed, occasionally with "ansible.vars.hostvars.HostVars object has no element "; Some of this might be explained by what they say. in https://github.com/ansible/ansible/issues/13343#issuecomment-160992631

hostvars emulates a dictionary [...]. hostvars is also lazily loaded

回答5:

Thanks a lot this note was very useful for me! Was able to send the variable defined under /group_var/vars in the ansible playbook as indicated below.

tasks:
- name: check service account password expiry
- command:

sh /home/monit/get_ldap_attr.sh {{ item }} {{ LDAP_AUTH_USR }}

回答6:

I've found also a nice and simple way to address hostsvars right on one of Ansible's Github issues

Looks like you can do this as well:

 - debug:
    msg: "{{ ansible_ssh_host }}"

来源：https://stackoverflow.com/questions/40027847/accessing-inventory-host-variable-in-ansible-playbook