Ansible 可分配角色工作流问题

我想（第1步）更改postgresql配置文件，（第2步）重新启动服务，然后（第3步）添加db用户

../roles/postgres/tasks/main.yml

- name: change postgre pg_hba.conf
  template: src=pg_hba.conf.j2 dest=/etc/postgresql/9.4/main/pg_hba.conf 
  notify: restart postgresql service
  tags: pg_hba

- name: set password for postgres
  postgresql_user:
    db: postgres
    user: postgres
    password: postgres

---
- name: restart postgresql service
  service: name=postgresql state=restarted enabled='yes'

../roles/postgres/handlers/main.yml

- name: change postgre pg_hba.conf
  template: src=pg_hba.conf.j2 dest=/etc/postgresql/9.4/main/pg_hba.conf 
  notify: restart postgresql service
  tags: pg_hba

- name: set password for postgres
  postgresql_user:
    db: postgres
    user: postgres
    password: postgres

---
- name: restart postgresql service
  service: name=postgresql state=restarted enabled='yes'

博士后

- hosts: postgresql_server
  remote_user: ubuntu
  become: true
  become_method: sudo
  become_user: root

  roles:
    - role: postgres

问题：ansible角色中的真正工作流是：step1->step3->step2

我可以通过将handlers任务移动到

。/roles/postgres/tasks/main.yml

来修复它，但无论配置文件是否更改，它都将重新启动服务

这种请求的最佳做法是什么？

在需要它的任务之前刷新处理程序：

- name: change postgre pg_hba.conf
  template: src=pg_hba.conf.j2 dest=/etc/postgresql/9.4/main/pg_hba.conf 
  notify: restart postgresql service
  tags: pg_hba

- meta: flush_handlers

- name: set password for postgres
  postgresql_user:
    db: postgres
    user: postgres
    password: postgres

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