# kubelet gives kubepods.slice a cpu.weight from its allocatable CPUs (313 on
# 8 cores), while system.slice and k3s.service keep the default 100. Under load
# the pods then outweigh etcd, apiserver and kubelet. Weight 1000 lets the
# control plane win that contention.
- name: Set the CPUWeight of system.slice and the k3s unit
  vars:
    k3s_unit: "{{ 'k3s' if type == 'server' else 'k3s-agent' }}.service"
  block:
    - name: Create the drop-in directories
      ansible.builtin.file:
        path: "/etc/systemd/system/{{ item }}.d"
        state: directory
        mode: "0755"
      loop:
        - system.slice
        - "{{ k3s_unit }}"

    - name: Write the CPUWeight drop-ins
      ansible.builtin.copy:
        dest: "/etc/systemd/system/{{ item.unit }}.d/50-cpu-weight.conf"
        mode: "0644"
        content: |
          [{{ item.section }}]
          CPUWeight=1000
      loop:
        - unit: system.slice
          section: Slice
        - unit: "{{ k3s_unit }}"
          section: Service
      register: cpu_weight

    # Only daemon-reload: the weight applies to the running k3s unit without a restart
    - name: Reload systemd for the CPUWeight drop-ins
      ansible.builtin.systemd_service:
        daemon_reload: true
      when: cpu_weight is changed