Ansible how restart service one after one on different hosts - ansible

Question

Hy every one !
pls help .
I have 3 server. Each of them have one systemd service. I need reboot this service by one.
So after i reboot service on host 1 , and this service is up ( i can check tcp port), i need reboot service on host 2 and so on.
How i can do it with ansible
Now i have such playbook:
---
- name: Install business service
hosts: business
vars:
app_name: "e-service"
app: "{{ app_name }}-{{ tag }}.war"
app_service: "{{ app_name }}.service"
app_bootstrap: "{{ app_name }}_bootstrap.yml"
app_folder: "{{ eps_client_dir }}/{{ app_name }}"
archive_folder: "{{ app_folder }}/archives/arch_{{ansible_date_time.date}}_{{ansible_date_time.hour}}_{{ansible_date_time.minute}}"
app_distrib_dir: "{{ eps_distrib_dir }}/{{ app_name }}"
app_dependencies: "{{ app_distrib_dir }}/dependencies.tgz"
tasks:
- name: Copy app {{ app }} to {{ app_folder }}
copy:
src: "{{ app_distrib_dir }}/{{ app }}"
dest: "{{ app_folder }}/{{ app }}"
group: ps_group
owner: ps
mode: 0644
notify:
- restart app
- name: Copy service setting to /etc/systemd/system/{{app_service}}
template:
src: "{{ app_distrib_dir }}/{{ app_service }}"
dest: /etc/systemd/system/{{ app_service }}
mode: 0644
notify:
- restart app
- name: Start service {{ app }}
systemd:
daemon-reload: yes
name: "{{ app_service }}"
state: started
enabled: true
handlers:
- name: restart app
systemd:
daemon-reload: yes
name: "{{ app_service }}"
state: restarted
enabled: true
and all service restart at one time.

Answer 1

try serial and max_fail_percentage, max_fail_percentage value is percent of the whole number of your hosts, if server 1 failed, then the rest server will not run,
---
- name: Install eps-business service
hosts: business
serial: 1
max_fail_percentage: 10

Answer 2

Try with
---
- name: Install eps-business service
hosts: business
serial: 1
By default, Ansible will try to manage all of the machines referenced in a play in parallel. For a rolling update use case, you can define how many hosts Ansible should manage at a single time by using the serial keyword
https://docs.ansible.com/ansible/latest/user_guide/playbooks_delegation.html

Answer 3

create a script that reboots your service and then add a loop that will check whether the service is up or not and once it is executed successfully based on the status it has returned you can go for the next service.