问题
In one of my ansible roles I would like to set up a basic network/interfaces stanza, like this:
auto eth1
ifaces eth1 inet dhcp
dns-nameserver {{ ansible_eth1.ipv4.address }}
dns-search maas
I have variables, and I create the stanza with the jinja2 template:
auto {{ iface }}
ifaces {{ iface}} inet dhcp
dns-nameserver {{ ansible_{{ iface }}.ipv4.address }}
dns-search maas
Can I reference a variable variable in a template? I also tried creating a variable in the ansible yaml, like nserver: ansible_{{iface}}.ipv4.address, that didn't work either!
回答1:
You can use built-in hostvars dict variable to reference variables of host.
auto {{ iface }}
iface {{ iface }} inet dhcp
dns-nameserver {{ hostvars[inventory_hostname]['ansible_'+ iface]['ipv4']['address'] }}
dns-search maas
inventory_hostname is name of current host as known by Ansible.
来源：https://stackoverflow.com/questions/32525652/how-to-reference-variable-variable-in-jinja2-template