I have variable named "network" registered in Ansible:
{
"addresses": {
"private_ext": [
{
"type": "fixed",
"addr": "172.16.2.100"
}
],
"private_man": [
{
"type": "fixed",
"addr": "172.16.1.100"
},
{
"type": "floating",
"addr": "10.90.80.10"
}
]
}
}
Is it possible to get the IP address ("addr") with type="floating" doing something like this?
- debug: var={{ network.addresses.private_man | filter type="fixed" | get "addr" }}
I know the syntax is wrong but you get the idea.
I've submitted a pull request (available in Ansible 2.2+) that will make this kinds of situations easier by adding jmespath query support on Ansible. In your case it would work like:
- debug: msg="{{ addresses | json_query(\"private_man[?type=='fixed'].addr\") }}"
would return:
ok: [localhost] => {
"msg": [
"172.16.1.100"
]
}
Not necessarily better, but since it's nice to have options here's how to do it using Jinja statements:
- debug:
msg: "{% for address in network.addresses.private_man %}\
{% if address.type == 'fixed' %}\
{{ address.addr }}\
{% endif %}\
{% endfor %}"
Or if you prefer to put it all on one line:
- debug:
msg: "{% for address in network.addresses.private_man if address.type == 'fixed' %}{{ address.addr }}{% endfor %}"
Which returns:
ok: [localhost] => {
"msg": "172.16.1.100"
}
To filter a list of dicts you can use the selectattr filter together with the equalto test:
network.addresses.private_man | selectattr("type", "equalto", "fixed")
The above requires Jinja2 v2.8 or later (regardless of Ansible version).
Ansible also has the tests match and search, which take regular expressions:
matchwill require a complete match in the string, whilesearchwill require a match inside of the string.
network.addresses.private_man | selectattr("type", "match", "^fixed$")
To reduce the list of dicts to a list of strings, so you only get a list of the addr fields, you can use the map filter:
... | map(attribute='addr') | list
Or if you want a comma separated string:
... | map(attribute='addr') | join(',')
Combined, it would look like this.
- debug: msg={{ network.addresses.private_man | selectattr("type", "equalto", "fixed") | map(attribute='addr') | join(',') }}
Source: Stackoverflow.com