chaos.yml

---

- name: Run chaos experiments
  become: true
  become_method: sudo
  hosts: all
  tasks:

  - name: Install chaos-tools
    ansible.builtin.package:
      name:
        - stress-ng
        - iproute2
        - htop
        - psmisc
      state: latest

  - name: Clear rules before making network errors
    command: tc qdisc del dev {{ ansible_default_ipv4.interface }} root
    ignore_errors: true

- name: Choose random host for every group
  hosts: localhost
  gather_facts: false
  tasks:
    - name: Network problems
      add_host:
        name: "{{ item }}"
        groups: network
      with_random_choice: "{{ groups.all }}"

    - name: Etcd service stop
      add_host:
        name: "{{ item }}"
        groups: etcd
      with_random_choice: "{{ groups['etcd_cluster'] }}"

    - name: Patroni service stop
      add_host:
        name: "{{ item }}"
        groups: psql
      with_random_choice: "{{ groups['postgres_cluster'] }}"

    - name: Cpu load
      add_host:
        name: "{{ item }}"
        groups: cpu
      with_random_choice: "{{ groups.all }}"

    - name: Ram load
      add_host:
        name: "{{ item }}"
        groups: ram
      with_random_choice: "{{ groups.all }}"
      
    - name: IO load
      add_host:
        name: "{{ item }}"
        groups: io
      with_random_choice: "{{ groups.all }}"

- name: Checking hosts
  hosts: all
  gather_facts: false
  tasks:
    - debug: var=group_names
      
- name: Make chaos!!!
  hosts: all
  become: true
  gather_facts: false
  vars_files: vars.yml
  roles: 
    - { role: network , when: "'network' in group_names and run_network == true"  }
    - { role: systemd , when: "'etcd' in group_names" , service: etcd}
    - { role: systemd , when: "'psql' in group_names", service: patroni }
    - { role: os , when: run_os == 'true' }

- name: Waiting "{{ chaos_timeout }}" seconds for system reaction
  hosts: localhost
  vars_files: vars.yml
  gather_facts: false
  tasks:
   - pause:
       seconds: "{{ chaos_timeout }}" 

- name: Rollback chaos
  become: true
  gather_facts: false
  hosts: all
  vars_files: vars.yml
  roles: 
    - role: rollback
  tags: rollback