Set iops and read write limit using cgroup

set-iops.yaml

---
- name: Set system-wide IOPS limitation via cgroups v2
  hosts: all
  become: true
  vars:
    main_blk_name: /dev/vda
    iops_limit: 10000
    rw_total_limit: 104857600  # 100mb in bytes
  tasks:
    - name: Get block device major:minor
      become: true
      ansible.builtin.shell: |
        lsblk -nd -o MAJ:MIN {{ main_blk_name }}
      register: _blk_dev
      changed_when: false

    - name: Set IOPS limit in the root cgroup
      become: true
      ansible.builtin.shell: |
        echo "{{ _blk_dev.stdout }} riops={{ iops_limit }} wiops={{ iops_limit }} rbps={{ rw_total_limit }} wbps={{ rw_total_limit }}" > {{ item }}
      loop:
        - /sys/fs/cgroup/init.scope/io.max
        - /sys/fs/cgroup/machine.slice/io.max
        - /sys/fs/cgroup/system.slice/io.max
        - /sys/fs/cgroup/user.slice/io.max
      ignore_errors: true

    - name: Verify the IOPS limit
      ansible.builtin.shell: |
        echo "init";
        cat /sys/fs/cgroup/init.scope/io.max;
        echo "machine";
        cat /sys/fs/cgroup/machine.slice/io.max;
        echo "syste";
        cat /sys/fs/cgroup/system.slice/io.max;
        echo "user"
        cat /sys/fs/cgroup/user.slice/io.max;
      register: _current_io_max

    - name: Print the current io.max value
      ansible.builtin.debug:
        msg: "{{ _current_io_max.stdout_lines }}"