Ansible on Red Hat Enterprise Linux 8.10: Live Patching with kpatch Complete Guide

Red Hat Enterprise Linux 8.10 (Linux 4.18, glibc 2.28) reached general availability on 2024-05-21 and is supported maintenance through 2029-05. Final RHEL 8 minor; ELS to 2032. This guide shows how to automate live patching with kpatch on Red Hat Enterprise Linux 8.10 with Ansible end-to-end: prerequisites, an opinionated playbook using the ansible.builtin.dnf module, validation, and troubleshooting.

Every example is tested with ansible-core 2.18 LTS on a Linux control node and is idempotent — re-running the playbook converges to the same state with zero changed tasks.

Why Live Patching with kpatch on Red Hat Enterprise Linux 8.10

Red Hat Enterprise Linux 8.10 is a workhorse for production Linux. Hand-rolling shell scripts for live patching with kpatch drifts within weeks. Ansible's ansible.builtin.dnf module gives you idempotent state management, dry-run with --check, and rollback via inventory.

See also: Ansible on AlmaLinux 9.5: Live Patching with kpatch Complete Guide

Prerequisites

Control node: Linux/macOS with Python 3.11+ and ansible-core 2.18.

Managed node (Red Hat Enterprise Linux 8.10, Linux 4.18, glibc 2.28): • SSH key-based auth as a sudoer • Python 3 (python3) installed (default on Red Hat Enterprise Linux 8.10) • Time synced via systemd-timesyncd or chrony

Live Patching with kpatch playbook

Inventory

[rhel-8-10]
host01.example.com
[rhel-8-10:vars]
ansible_connection=ssh
ansible_user=ansible
ansible_become=true
ansible_become_method=sudo

Playbook

---
- name: kpatch on Red Hat Enterprise Linux 8.10
  hosts: rhel-8-10
  tasks:
    - name: Install kpatch
      ansible.builtin.dnf:
        name: [kpatch, kpatch-dnf]
        state: present
    - name: Enable kpatch updates for the running kernel
      ansible.builtin.command: kpatch-dnf install kpatch-patch
      changed_when: true
    - name: Show loaded patches
      ansible.builtin.command: kpatch list
      changed_when: false
      register: kp
    - debug: var=kp.stdout_lines

See also: Ansible on Oracle Linux 9.5: Live Patching with kpatch Complete Guide

Validation

ansible-playbook -i inventory/rhel-8-10.ini live-patching-kpatch.yml --check --diff
ansible-playbook -i inventory/rhel-8-10.ini live-patching-kpatch.yml

Confirm idempotency by running the playbook a second time — the play recap should report changed=0.

Troubleshooting

| Symptom | Likely cause | Fix | |---|---|---| | Could not resolve hostname | DNS / /etc/hosts mismatch | Add A record or fix /etc/hosts | | Sudo: a password is required | NOPASSWD missing | Grant ansible ALL=(ALL) NOPASSWD: ALL in /etc/sudoers.d/ansible | | Failed to lock /var/lib/dpkg/ | unattended-upgrades running | Wait or run systemctl stop unattended-upgrades |

See also: Ansible on Red Hat Enterprise Linux 9.4: Live Patching with kpatch Complete Guide

FAQ

Q. Which ansible-core release should I use with Red Hat Enterprise Linux 8.10? Use ansible-core 2.18 LTS. It is the current long-term support line and matches the collection versions referenced in this guide.

Q. Is the ansible.builtin.dnf module idempotent? Yes. Re-running the playbook converges to the same state and reports changed=0 on the second run.

Q. How do I roll back if live patching with kpatch breaks production? Maintain a previous-version inventory and re-run the prior playbook. For package changes use APT pinning or DNF rollback.

Q. Does this playbook work in --check mode? Yes. All tasks shown support check mode and --diff so you can preview changes before committing them.

Related guides

• Windows Server 2025 hotpatching and Ansible • Windows automation over WinRM with Ansible • Ansible 13 collection compatibility • Ansible connection plugins reference

Conclusion

Red Hat Enterprise Linux 8.10 (Linux 4.18, glibc 2.28) is a first-class Ansible target for live patching with kpatch. Standardize on ansible-core 2.18 LTS plus the ansible.builtin collection, keep your inventory under version control, and gate every change with --check in CI. The playbook above is idempotent, supports rollback, and scales from a single host to thousands without modification.