Add Secondary Groups to Linux Users with Ansible Playbook

By Luca Berton · Published 2024-01-01 · Category: troubleshooting

Learn how to add secondary groups to Linux users with an Ansible playbook. This step-by-step guide includes YAML configuration and execution details.

Add Secondary Groups to Linux Users with Ansible Playbook

How to add a user to a second group on Linux with Ansible?

Ansible adds a user to second a group

ansible.builtin.user
Manage user accounts

Today we're talking about the Ansible module user. The full name is ansible.builtin.user, which means that is part of the collection of modules "builtin" with ansible and shipped with it. It's a module pretty stable and out for years, it manages user accounts. It supports a huge variety of Linux distributions, SunOS and macOS and FreeBSD. For Windows, use the ansible.windows.win_user module instead.

Parameters

name string - username
group - user's primary group (only one)
groups list / elements=string - list of groups user will be added to
append boolean - no/yes - If yes, add the user to the groups specified in groups. If no, replace.

This module has many parameters, let me highlight the use for our use-case. The only required is "name", which is the username. The primary group is specified in the "group" parameter, every user needs to be part of only one group. The "groups" parameter specifies the list of additional groups that the user will be added to. This type of group sometimes is called also "secondary", "additional" or "supplementary". The parameter "append" is very important. With the "yes" option, the user is going to be added to the specified groups. With the "no" option, all group members are going to be overwritten with the specified groups. So to Conclusion is you specify the "no" option you are going to lose all the previous group associations, please be careful!

Playbook

Add a user to second a group with Ansible Playbook.

code

user_group_addsecondary.yml

---
- name: user module Playbook
  hosts: all
  become: true
  vars:
    myuser: "example"
    mygroups:
      - adm
      - sys
  tasks:
    - name: adding secondary group(s)
      ansible.builtin.user:
        name: "{{ myuser }}"
        groups: "{{ mygroups }}"
        append: true

execution

$ ansible-playbook -i virtualmachines/demo/inventory users_and_groups/user_group_addsecondary.yml
PLAY [user module Playbook] ***************************************************************************
TASK [Gathering Facts] ****************************************************************************
ok: [demo.example.com]
TASK [adding secondary groups] ********************************************************************
changed: [demo.example.com]
PLAY RECAP ****************************************************************************************
demo.example.com           : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0

before execution

$ ssh devops@demo.example.com
[devops@demo ~]$ sudo su
[root@demo devops]# cat /etc/os-release 
NAME="Red Hat Enterprise Linux"
VERSION="8.5 (Ootpa)"
ID="rhel"
ID_LIKE="fedora"
VERSION_ID="8.5"
PLATFORM_ID="platform:el8"
PRETTY_NAME="Red Hat Enterprise Linux 8.5 (Ootpa)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:redhat:enterprise_linux:8::baseos"
HOME_URL="https://www.redhat.com/"
DOCUMENTATION_URL="https://access.redhat.com/documentation/red_hat_enterprise_linux/8/"
BUG_REPORT_URL="https://bugzilla.redhat.com/"
REDHAT_BUGZILLA_PRODUCT="Red Hat Enterprise Linux 8"
REDHAT_BUGZILLA_PRODUCT_VERSION=8.5
REDHAT_SUPPORT_PRODUCT="Red Hat Enterprise Linux"
REDHAT_SUPPORT_PRODUCT_VERSION="8.5"
[root@demo devops]# getent passwd | grep example
example:x:1002:1002:Ansible example:/home/example:/bin/bash
[root@demo devops]# id example
uid=1002(example) gid=1002(example) groups=1002(example),10(wheel)
[root@demo devops]# groups example
example : example wheel
[root@demo devops]# grep example /etc/group
wheel:x:10:example
example:x:1002:
[root@demo devops]#

after execution

$ ssh devops@demo.example.com
[devops@demo ~]$ sudo su
[root@demo devops]# id example
uid=1002(example) gid=1002(example) groups=1002(example),3(sys),4(adm),10(wheel)
[root@demo devops]# groups example
example : example sys adm wheel
[root@demo devops]# getent passwd | grep example
example:x:1002:1002:Ansible example:/home/example:/bin/bash
[root@demo devops]# grep example /etc/group
sys:x:3:example
adm:x:4:example
wheel:x:10:example
example:x:1002:
[root@demo devops]#

code with ❤️ in GitHub

Conclusion

Now you know how to add a user to second a group with Ansible.

Category: troubleshooting

Watch the video: Add Secondary Groups to Linux Users with Ansible Playbook — Video Tutorial

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