EX294 Manage task execution and roles — All Questions With Answers

Refer to the exhibit.

```yaml
---
- hosts: all
  tasks:
    - name: Create user
      ansible.builtin.user:
        name: jdoe
        state: present
      register: user_result

    - name: Show user info
      ansible.builtin.debug:
        var: user_result
```

Refer to the exhibit.

```
TASK [Gathering Facts] *********************************************************
ok: [server1.example.com]

TASK [role1 : Install package] *************************************************
fatal: [server1.example.com]: FAILED! => {"changed": false, "msg": "No package matching 'httpd' found available, tried all mirrors", "rc": 126, "results": []}
```

Refer to the exhibit.

```yaml
- name: Deploy web server
  hosts: webservers
  roles:
    - common
    - nginx
```

And the output of `ansible-playbook site.yml --check` shows:

```
PLAY [Deploy web server] *************************
TASK [common : include_vars] *********************
ok: [web1]
TASK [nginx : install nginx] *********************
fatal: [web1]: FAILED! => {"msg": "The task includes an option with an undefined variable. The error was: 'nginx_version' is undefined"}
```

- hosts: all
  tasks:
    - name: Import tasks
      import_tasks: "{{ item }}.yml"
      loop:
        - setup
        - configure

TASK [Start long running process] *************************
changed: [host1]
ASYNC POLL on host1: jid=j1234567890 started, poll=0
TASK [Check on async job] *********************************
ok: [host1] => {
    "ansible_job_id": "j1234567890",
    "finished": 0,
    "started": 1
}

dependencies:
  - role: common
    allow_duplicates: false

Refer to the exhibit.

---
- hosts: webservers
  roles:
    - role: common
    - role: nginx
      vars:
        http_port: 8080
  tasks:
    - name: ensure nginx is running
      ansible.builtin.service:
        name: nginx
        state: started

Refer to the exhibit.

TASK [Install packages] ********************************************************
fatal: [db1]: FAILED! => {"changed": false, "msg": "No package matching 'mariadb' found"}
...ignoring

Refer to the exhibit.

roles/
└── myrole/
    ├── defaults/
    │   └── main.yml
    ├── tasks/
    │   └── main.yml
    ├── handlers/
    │   └── main.yml
    ├── templates/
    ├── files/
    ├── vars/
    │   └── main.yml
    ├── meta/
    │   └── main.yml
    └── README.md

---
- hosts: dbservers
  tasks:
    - name: Create postgres user
      user:
        name: postgres
        state: present
      become: yes
      become_user: postgres
      become_method: sudo

Error: 

fatal: [server1]: FAILED! => {"msg": "Missing sudo password"}

---
- hosts: webservers
  vars:
    http_port: 80
  tasks:
  - name: Ensure Apache is running
    service:
      name: httpd
      state: started
  - name: Check if port is open
    wait_for:
      host: "{{ ansible_facts['default_ipv4']['address'] }}"
      port: "{{ http_port }}"
      state: started
    delegate_to: localhost

[root@control ansible]# cat roles/apache/tasks/main.yml
---
- name: Install httpd
  yum:
    name: httpd
    state: present
  notify: restart httpd

- name: Ensure httpd is running
  service:
    name: httpd
    state: started
    enabled: yes

[root@control ansible]# cat roles/apache/handlers/main.yml
---
- name: restart httpd
  service:
    name: httpd
    state: restarted

[root@control ansible]# cat playbook.yml
---
- hosts: all
  roles:
    - apache

[root@control ansible]# ansible-playbook playbook.yml
...
TASK [apache : Install httpd] *************************************************
changed: [server1.example.com]

TASK [apache : Ensure httpd is running] ***************************************
ok: [server1.example.com]

RUNNING HANDLER [apache : restart httpd] **************************************
changed: [server1.example.com]

[root@control ansible]# cat ansible.cfg
[defaults]
host_key_checking = False
inventory = ./inventory
roles_path = ./roles

[inventory]
enable_plugins = host_list, script, auto, yaml, ini, toml

[privilege_escalation]
become = True
become_method = sudo
become_user = root
become_ask_pass = False

[root@control ansible]# cat inventory
[webservers]
web1 ansible_host=192.168.1.10 ansible_user=admin
web2 ansible_host=192.168.1.11 ansible_user=admin

[dbservers]
db1 ansible_host=192.168.1.20 ansible_user=admin

[all:vars]
ansible_python_interpreter=/usr/bin/python3

[root@control ansible]# ansible webservers -m ping
web1 | SUCCESS => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python3"
    },
    "changed": false,
    "ping": "pong"
}
web2 | SUCCESS => {
    "ansible_facts": {
        "discovered_interpreter_python": "/usr/bin/python3"
    },
    "changed": false,
    "ping": "pong"
}