Ansible - get variables from group_vars and host_vars together into a list
You need to use extract
and map
combination:
kafka_hosts: "{{ groups['kafka'] | map('extract',hostvars,'ansible_host') | list }}"
Serge Hartmann
Updated on June 28, 2022Comments
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Serge Hartmann almost 2 years
I am trying to get from an inventory group a list of IP addresses instead of host names. These IP addresses are already in my hostvars but I cant make them matching a list from their group name.
Here is my original playbook :
- name: Install Kafka hosts: kafka roles: - role: kafka kafka_hosts: "{{ groups['kafka'] | list }}" kafka_zookeeper_hosts: "{{ groups['zookeeper'] | list }}"
As you can see, kafka_hosts and kafka_zookeeper_hosts are lists. The result of this playbook to my servers configuration is correct :
/etc/kafka/consumer.properties:zookeeper.connect=opo-4:2181,opo-5:2181,opo-6:2181 /etc/kafka/producer.properties:metadata.broker.list=opo-1:9092,opo-2:9092,opo-3:9092
Unfortunately, this configuration does not work for all my servers because of DNS issues. I need a list of IP addresses instead of hostnames.
If I set manually the IP addresses in my playbook, my configuration works, unfortunately not dynamically :
kafka_hosts: - 192.168.48.1 - 192.168.48.2 - 192.168.48.3 kafka_zookeeper_hosts: - 192.168.48.4 - 192.168.48.5 - 192.168.48.6
And the result on my servers make it working :
/etc/kafka/consumer.properties:zookeeper.connect=192.168.48.4:2181,192.168.48.5:2181,192.168.48.6:2181 /etc/kafka/producer.properties:metadata.broker.list=192.168.48.1:9092,192.168.48.2:9092,192.168.48.3:9092
In this configuration I have to maintain manually my groups and my playbook with the same information. So I would like to get the hostvars from groups kafka and zookeeper.
Here are hostvars and groups, defined in the main inventory file :
[opo] opo-1 ansible_host=192.168.48.1 opo-2 ansible_host=192.168.48.2 ... opo-6 ansible_host=192.168.48.6 [zookeeper] opo-1 opo-2 opo-3 [kafka] opo-4 opo-5 opo-6
What I have tried - based on answers found on stackoverflow from similar issues :
- kafka_hosts: "{{ groups[['kafka']['ansible_host']] | list }}"
- kafka_hosts: "{{ [hostvars[groups['kafka'][0]]['ansible_host']] | list }}" # the list contains only the first ip address
- kafka_hosts: "{{ [hostvars[groups['kafka']]['ansible_host']] | list }}"
- kafka_hosts: "{{ hostvars[groups['kafka']].ansible_host | list }}"
- kafka_hosts: "{{ [hostvars.[groups['kafka']].ansible_host] | list }}"
- kafka_hosts: "{{ groups['kafka'].ansible_host | list }}"
None of them gives the expected list of IP addresses.
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Serge Hartmann almost 7 yearsThis was the right syntax. Works fine ! Thank you Konstantin.