日拱一卒

[greg@control ansible]$ ansible dev -m shell -a 'cat /etc/group | grep webdev'
node1 | CHANGED | rc=0 >>
webdev:x:1003:
[greg@control ansible]$ vim /home/greg/ansible/webcontent.yml
---
- name: 创建 Web 内容目录
  hosts: dev
  roles:
  - apache
  tasks:
  - name: Create a directory if it does not exist
    file:
      path: /webdev
      state: directory
      group: webdev
      mode: '2775'
  - name: Create a symbolic link
    file:
      src: /webdev
      dest: /var/www/html/webdev
      state: link
  - name: Copy using inline content
    copy:
      content: 'Development'
      dest: /webdev/index.html
      setype: httpd_sys_content_t
[greg@control ansible]$ ansible-playbook webcontent.yml 
[greg@control ansible]$ curl http://172.25.250.9/webdev/
Development

[greg@control ansible]$ vim /home/greg/ansible/issue.yml
---
- name: 修改文件内容
  hosts: all
  tasks:
  - name: Copy using inline content
    copy:
      content: 'Development'
      dest: /etc/issue
    when: inventory_hostname in groups['dev']
  - name: Copy using inline content
    copy:
      content: 'Test'
      dest: /etc/issue
    when: inventory_hostname in groups['test']
  - name: Copy using inline content
    copy:
      content: 'Production'
      dest: /etc/issue
    when: inventory_hostname in groups['prod']
[greg@control ansible]$ ansible-playbook issue.yml 
[greg@control ansible]$ ansible dev -a 'cat /etc/issue'
node1 | CHANGED | rc=0 >>
Development
[greg@control ansible]$ ansible test -a 'cat /etc/issue'
node2 | CHANGED | rc=0 >>
Test
[greg@control ansible]$ ansible prod -a 'cat /etc/issue'
node4 | CHANGED | rc=0 >>
Production
node3 | CHANGED | rc=0 >>
Production

[greg@control ansible]$ wget http://materials/hosts.j2
[greg@control ansible]$ vim hosts.j2 
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

{% for host in groups['all'] %}
{{ hostvars[host]['ansible_facts']['default_ipv4']['address'] }} {{ hostvars[host]['ansible_facts']['nodename'] }} {{ hostvars[host]['ansible_facts']['hostname'] }}
{% endfor %}
[greg@control ansible]$ vim /home/greg/ansible/hosts.yml
---
- name: 生成主机文件
  hosts: all
  tasks:
  - name: Template a file to /etc/myhosts
    template:
      src: hosts.j2
      dest: /etc/myhosts
    when: inventory_hostname in groups['dev']
[greg@control ansible]$ ansible-playbook hosts.yml 
[greg@control ansible]$ ansible dev -a 'cat /etc/myhosts'
node1 | CHANGED | rc=0 >>
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6

172.25.250.9 node1.lab.example.com node1
172.25.250.10 node2.lab.example.com node2
172.25.250.13 node5.lab.example.com node5
172.25.250.11 node3.lab.example.com node3
172.25.250.12 node4.lab.example.com node4

[greg@control ansible]$ vim /home/greg/ansible/lv.yml
---
- name: 创建和使用逻辑卷
  hosts: all
  tasks:
  - block:
    - name: Create a logical volume of 1500m
      lvol:
        vg: research
        lv: data
        size: 1500m
    - name: Create a ext4 filesystem on /dev/research/data
      filesystem:
        fstype: ext4
        dev: /dev/research/data
    rescue:
    - debug:
        msg: Could not create logical volume of that size
    - name: Create a logical volume of 800m
      lvol:
        vg: research
        lv: data
        size: 800m
    when: ansible_facts['lvm']['vgs']['research'] is defined
  - debug:
      msg: Volume group does not exist
    when: ansible_facts['lvm']['vgs']['research'] is undefined
[greg@control ansible]$ ansible-playbook lv.yml 

[greg@control ansible]$ vim /home/greg/ansible/partition.yml
---
- name: 创建和使用分区
  hosts: all
  tasks:
  - block:
    - name: Create a new primary partition with a size of 1500MiB
      parted:
        device: /dev/vdb
        number: 1
        state: present
        part_end: 1500MiB
    - name: Create a ext4 filesystem on /dev/vdb1
      filesystem:
        fstype: ext4
        dev: /dev/vdb1
    - name: Mount /data
      mount:
        path: /data
        src: /dev/vdb1
        fstype: ext4
        state: mounted
      when: inventory_hostname in groups.prod
    rescue:
    - debug:
        msg: Could not create partition of that size
    - name: Create a new primary partition with a size of 800MiB
      parted:
        device: /dev/vdb
        number: 1
        state: present
        part_end: 800MiB
    when: ansible_facts['devices']['vdb'] is defined
  - debug:
      msg: this disk is not exist
    when: ansible_facts['devices']['vdb'] is undefined
[greg@control ansible]$ ansible-playbook partition.yml