How to Configure Kernel Parameters in RedHat-like Linux systems with Ansible using system role? I'm going to show you a live Playbook with some simple Ansible code. I'm Luca Berton and welcome to today's episode of Ansible Pilot. Ansible Configure Kernel Parameters in RedHat-like systems - `linux-system-roles` Fedora, Enterprise Linux & CentOS - `rhel-system-roles` package Red Hat Enterprise Linux Today we're talking about `linux-system-role`. This is a swiss army that you need to absolutely add to your IT knowledge. Currently, there are 21 roles to configure a lot of system properties. The roles are developed and tested for RedHat-like systems but the project might expand in the future. It's available as a package named `linux-system-role` for Fedora, Enterprise Linux, and CentOS. In Red Hat Enterprise Linux is named `rhel-system-roles` and is available since RHEL 8. If you would like to know more about the available roles and jump immediately to the Ansible Galaxy page or the official website. Links - https://galaxy.ansible.com/linux-system-roles - https://linux-system-roles.github.io/ ## Playbook Configure Kernel Parameters in RedHat-like Linux systems with Ansible System Role code ```yaml --- - name: kernel_settings Playbook hosts: all become: true vars: kernel_settings_sysctrl: - name: fs.file-max value: 400000 - name: kernel.threads-max value: 65536 kernel_settings_sysfs: - name: /sys/class/net/lo/mtu value: 65000 kernel_settings_transparent_hugepages: madvise roles: - linux-system-roles.kernel_settings ``` execution ```bash $ ansible-playbook -i inventory kernel_settings.yml PLAY [kernel_settings Playbook] *********************************************************************** TASK [Gathering Facts] **************************************************************************** [DEPRECATION WARNING]: Distribution fedora 35 on host fedora.example.com should use /usr/bin/python3, but is using /usr/bin/python for backward compatibility with prior Ansible releases. A future Ansible release will default to using the discovered platform python for this host. See https://docs.ansible.com/ansible/2.9/reference_appendices/interpreter_discovery.html for more information. This feature will be removed in version 2.12. Deprecation warnings can be disabled by setting deprecation_warnings=False in ansible.cfg. ok: [fedora.example.com] TASK [linux-system-roles.kernel_settings : Set version specific variables] ************************ ok: [fedora.example.com] TASK [linux-system-roles.kernel_settings : Ensure required packages are installed] **************** ok: [fedora.example.com] TASK [linux-system-roles.kernel_settings : Ensure required services are enabled and started] ****** ok: [fedora.example.com] => (item=tuned) TASK [linux-system-roles.kernel_settings : Ensure kernel settings profile directory exists] ******* ok: [fedora.example.com] TASK [linux-system-roles.kernel_settin