Ansible practical Series II_ Getting started with Playbook

Preface

 demand ：  Operate multiple hosts ,  by Kubespray Do matting 

Environmental Science

Ubuntu 20.04

1、 command

-k(–ask-pass)  For interactive input ssh password 
-K(-ask-become-pass)  For interactive input sudo password 
-u  Designated user 

		# ansible-playbook a.yml --syntax-check    # Check yaml Is the syntax of the file correct 
		# ansible-playbook a.yml --list-task       # Check tasks Mission 
		# ansible-playbook a.yml --list-hosts      # Check the active host 
		# ansible-playbook a.yml --start-at-task='Copy Nginx.conf'     # Designate from a task Began to run 

2、 Example

demo 1: How to get started

• edit

sudo nano demo1.yaml
#  Revised as follows 
- hosts: 172.16.106.20                  # Designated host 
  remote_user: ubuntu20                         # Specifies the user who performs tasks on the managed host 
  tasks:                                            # Task list ↓
  - name: hello world                # Task name close firewall 
    command: 'echo hello world'    # call command modular   Execute the turn off firewall command 

• perform

ansible-playbook demo1.yml --syntax-check
ansible-playbook demo1.yaml

• Output is as follows

PLAY [172.16.106.20] ***************************************************************************************

TASK [Gathering Facts] *************************************************************************************
ok: [172.16.106.20]

TASK [hello world] *****************************************************************************************
changed: [172.16.106.20]

PLAY RECAP *************************************************************************************************
172.16.106.20              : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   

demo 2: Specify user groups

The default is /etc/ansible/hosts Inside

• see

cat /etc/ansible/hosts
#  Output 
[web]
172.16.106.20 ansible_ssh_user='ubuntu20'
172.16.106.21 ansible_ssh_user='ubuntu20'
172.16.106.22 ansible_ssh_user='ubuntu20'

• edit

sudo nano demo2.yaml
#  Revised as follows 
- hosts: web                # Designated host 
  remote_user: ubuntu20                         # Specifies the user who performs tasks on the managed host 
  tasks:                                            # Task list ↓
  - name: hello world                # Task name close firewall 
    command: 'echo hello world'    # call command modular   Execute the turn off firewall command 

• perform

ansible-playbook demo2.yml --syntax-check
ansible-playbook demo2.yaml

• Output is as follows

PLAY [web] *********************************************************************************************************************************

TASK [Gathering Facts] *********************************************************************************************************************
ok: [172.16.106.20]
ok: [172.16.106.21]
ok: [172.16.106.22]

TASK [hello world] *************************************************************************************************************************
changed: [172.16.106.20]
changed: [172.16.106.21]
changed: [172.16.106.22]

PLAY RECAP *********************************************************************************************************************************
172.16.106.20              : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
172.16.106.21              : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
172.16.106.22              : ok=2    changed=1    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0  

demo 3: Approximate folder structure

tree
#  Output is as follows 
.
├── demo3.yaml
└── hosts
    └── demo3.ini

• edit hosts Folder

sudo nano hosts/demo3.ini
#  Revised as follows ：
[web]
172.16.106.20 ansible_ssh_user='ubuntu20'
172.16.106.21 ansible_ssh_user='ubuntu20'
172.16.106.22 ansible_ssh_user='ubuntu20'

• edit yaml file

sudo nano demo3.yaml
#  Revised as follows ：
- hosts: web
  tasks:
  - name: echo hello world
    command: 'echo hello world'

• function

ansible-playbook demo3.yaml --syntax-check
ansible-playbook -i hosts/demo3.ini demo3.yaml

demo 4: add to roles Folder

#  undetermined   Write it yourself 

other

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