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 :
None of them gives the expected list of IP addresses.
You need to use extract
and map
combination:
kafka_hosts: "{{ groups['kafka'] | map('extract',hostvars,'ansible_host') | list }}"