Does not enable as a systemd service

[methodmain]

Using this role I found that systemctl status redis-server would return

redis-server.service - Advanced key-value store
   Loaded: loaded (/lib/systemd/system/redis-server.service; disabled; vendor preset: enabled)
   Active: active (running) since Wed 2018-12-05 19:35:24 UTC; 2min 39s ago
     Docs: http://redis.io/documentation,
           man:redis-server(1)
 Main PID: 13355 (redis-server)
    Tasks: 4 (limit: 4383)
   CGroup: /system.slice/redis-server.service
           `-13355 /usr/bin/redis-server 127.0.0.1:6379

In tasks/main.yml there is the line service: "name={{ redis_daemon }} state=started enabled=yes" which should enable the service.

To get around this I added my own task after the geerlingguy.redis role completed:

- name: enable redis-server
  systemd:
    name: redis-server
    enabled: yes
  when: ansible_service_mgr == 'systemd'

which effectively didn't change anything. I finally tried:

- name: Ensure redis-server is enabled
  shell: systemctl enable redis-server
  register: enable_result
  when: ansible_service_mgr == 'systemd'
  changed_when: "'Created symlink' in enable_result.stderr" 

this did work with the output:

changed: [voltserv-app-04] => {
    "changed": true,
    "cmd": "systemctl enable redis-server",
    "delta": "0:00:00.500761",
    "end": "2018-12-05 19:03:05.330731",
    "invocation": {
        "module_args": {
            "_raw_params": "systemctl enable redis-server",
            "_uses_shell": true,
            "argv": null,
            "chdir": null,
            "creates": null,
            "executable": null,
            "removes": null,
            "stdin": null,
            "warn": true
        }
    },
    "rc": 0,
    "start": "2018-12-05 19:03:04.829970",
    "stderr": "Synchronizing state of redis-server.service with SysV service script with /lib/systemd/systemd-sysv-install.\nExecuting: /lib/systemd/systemd-sysv-install enable redis-server\nCreated symlink /etc/systemd/system/redis.service -> /lib/systemd/system/redis-server.service.",
    "stderr_lines": [
        "Synchronizing state of redis-server.service with SysV service script with /lib/systemd/systemd-sysv-install.",
        "Executing: /lib/systemd/systemd-sysv-install enable redis-server",
        "Created symlink /etc/systemd/system/redis.service -> /lib/systemd/system/redis-server.service."
    ],
    "stdout": "",
    "stdout_lines": []
}changed: [voltserv-app-04] => {
    "changed": true,
    "cmd": "systemctl enable redis-server",
    "delta": "0:00:00.500761",
    "end": "2018-12-05 19:03:05.330731",
    "invocation": {
        "module_args": {
            "_raw_params": "systemctl enable redis-server",
            "_uses_shell": true,
            "argv": null,
            "chdir": null,
            "creates": null,
            "executable": null,
            "removes": null,
            "stdin": null,
            "warn": true
        }
    },
    "rc": 0,
    "start": "2018-12-05 19:03:04.829970",
    "stderr": "Synchronizing state of redis-server.service with SysV service script with /lib/systemd/systemd-sysv-install.\nExecuting: /lib/systemd/systemd-sysv-install enable redis-server\nCreated symlink /etc/systemd/system/redis.service -> /lib/systemd/system/redis-server.service.",
    "stderr_lines": [
        "Synchronizing state of redis-server.service with SysV service script with /lib/systemd/systemd-sysv-install.",
        "Executing: /lib/systemd/systemd-sysv-install enable redis-server",
        "Created symlink /etc/systemd/system/redis.service -> /lib/systemd/system/redis-server.service."
    ],
    "stdout": "",
    "stdout_lines": []
}

I would expect that the service should be enabled to start with, and also that the initial attempt to enable would work. I wouldn't rule out user error but figured I'd submitted an issue anyway. Let me know if I can provide any other info.

- Ansible version: ansible 2.6.2
  config file = None
  configured module search path = [u'/Users/greggbailey/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/local/lib/python2.7/site-packages/ansible
  executable location = /usr/local/bin/ansible
  python version = 2.7.15 (default, Jun 17 2018, 12:46:58) [GCC 4.2.1 Compatible Apple LLVM 9.1.0 (clang-902.0.39.2)]
- Machine running ansible playbook: macOS Mojave 10.14.1
- Linux version: NAME="Ubuntu"
VERSION="18.04.1 LTS (Bionic Beaver)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 18.04.1 LTS"
VERSION_ID="18.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=bionic
UBUNTU_CODENAME=bionic
- geerlinguy.redis: 1.6.0 (also experienced issue on 1.5.1)

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