Having issues with rs.add() in ansible playbook for mongo - mongodb

Question

I am using below tasks in my playbook to initialize cluster and add secondary to primary:
- name: Initialize replica set
run_once: true
delegate_to: host1
shell: >
mongo --eval 'printjson(rs.initiate())'
- name: Format secondaries
run_once: true
local_action:
module: debug
msg: '"{{ item }}:27017"'
with_items: ['host2', 'host3']
register: secondaries
- name: Add secondaries
run_once: true
delegate_to: host1
shell: >
/usr/bin/mongo --eval 'printjson(rs.add({{ item.msg }}))'
with_items: secondaries.results
I am getting below error:
TASK [mongodb-setup : Add secondaries] *******************************
fatal: [host1]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'ansible.utils.unsafe_proxy.AnsibleUnsafeText object' has no attribute 'msg'\n\nThe error appears to have been in '/var/lib/awx/projects/_dev/roles/mongodb-setup/tasks/users.yml': line 15, column 3, but may\nbe elsewhere in the file depending on the exact syntax problem.\n\nThe offending line appears to be:\n\n\n- name: Add secondaries\n ^ here\n"}
Thanks for the response, I have amended my code as below
- name: Add secondaries
run_once: true
delegate_to: host-1
shell: >
/usr/bin/mongo --eval 'printjson(rs.add({{ item }}:27017))'
with_items:
- host2
- host3
but getting below error
failed: [host-2 -> host-1] (item=host-2) => {"changed": true, "cmd": "/usr/bin/mongo --eval 'printjson(rs.add(host-2:27017))'", "delta": "0:00:00.173077", "end": "2019-08-06 13:29:09.422560", "item": "host-2", "msg": "non-zero return code", "rc": 252, "start": "2019-08-06 13:29:09.249483", "stderr": "", "stderr_lines": [], "stdout": "MongoDB shell version: 3.2.22\nconnecting to: test\n2019-08-06T13:29:09.419-0500 E QUERY [thread1] SyntaxError: missing ) after argument list #(shell eval):1:37", "stdout_lines": ["MongoDB shell version: 3.2.22", "connecting to: test", "2019-08-06T13:29:09.419-0500 E QUERY [thread1] SyntaxError: missing ) after argument list #(shell eval):1:37"]}

Answer 1

You issue is not with rs.add() but with the data you loop over. In your last task, your item list is a single string.
# Wrong #
with_items: secondaries.results
You want to pass an actual list form your previously registered result:
with_items: "{{ secondaries.results }}"
That being said, registering the result of a debug task is rather odd. You should use set_fact to register what you need in a var, or better directly loop other your list of hosts in your task. It also looks like the rs.add funcion is exepecting a string so you should quote the argument in your eval. Something like:
- name: Add secondaries
shell: >
/usr/bin/mongo --eval 'printjson(rs.add("{{ item }}:27017"))'
with_items:
- host2
- host3
And the way you use delegation seems rather strange to me in this context but it's hard to give any valid clues without a complete playbook example of what you are trying to do (that you might give in a new question if necessary).