Ansible array variable

Question

I have a template file config.j2.

{% for host in groups['dbs'] %} ips= {{ hostvars[host].ansible_default_ipv4.address }} {% endfor %} 

My output is:

 ips= 192.168.231.91 ips= 192.168.231.92 ips= 192.168.231.93 

I want save the output in an array variable like this:

ips=192.168.231.91,192.168.231.92,192.168.231.93

How can do this? thanks.

Edit and output after finding a solution:

 - set_fact: ips: [] run_once: true - set_fact: ips: "{{ips}} + ['{{hostvars[item].ansible_default_ipv4.address}}']" with_inventory_hostnames: - dbs run_once: true - name: Save ip servers template: src=conf.j2 dest=/root TASK [Gathering Facts] ************************************************************************************************************************* ok: [db1] ok: [db2] ok: [db3] TASK [get-var : set_fact] ********************************************************************************************************************** ok: [db1] TASK [get-var : set_fact] ********************************************************************************************************************** ok: [db1] => (item=db1) ok: [db1] => (item=db3) ok: [db1] => (item=db2) TASK [get-var : Save ip servers] *************************************************************************************************************** ok: [db1] ok: [db2] ok: [db3] PLAY RECAP ************************************************************************************************************************************* db1 : ok=4 changed=0 unreachable=0 failed=0 db2 : ok=2 changed=0 unreachable=0 failed=0 db3 : ok=2 changed=0 unreachable=0 failed=0 

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Finally output in template on hosts (dbs):

[root@db1 ~]# cat conf.j2 ips=[] [root@db1 ~]# 

Answer 1

One solution in a playbook would be to initialize an empty list, then append to it looping over hostnames in your inventory group:

- set_fact: ips: [] run_once: true - set_fact: ips: "{{ips}} + ['{{hostvars[item].ansible_default_ipv4.address}}']" with_inventory_hostnames: - dbs run_once: true - template: src: config.j2 dest: /tmp/whatever 

with a template file config.j2 containing

ips={{ ips|to_yaml }} 

Answer 2

Here is how I got it working

 - set_fact: ips="[]" run_once: true - set_fact: ips="{{ ips }} + ['{{ hostvars[item].ansible_default_ipv4.address }}']" with_inventory_hostnames: - dbs run_once: true - name: get ip list locally local_action: copy content="{{ ips }}" dest=files/nodes run_once: true 

files/nodes

["192.168.1.13", "192.168.1.8", "192.168.1.14", "192.168.1.6", "192.168.1.9"] 

Answer 3

if you use variable ansible_host for each host in your inventory You can do it like this:

- set_fact: nodelist={%for host in groups['dbs']%}{{hostvars[host].ansible_host}}{% if not loop.last %},{% endif %}{% endfor %} 

OR by your conditions:

- set_fact: nodelist={%for host in groups['dbs']%} {{ hostvars[host].ansible_default_ipv4.address }}{% if not loop.last %},{% endif %}{% endfor %} 

Note: code should be in one line.