备注：以下下示例主机组均为pxg
####系统符合就安装apache###
- name: Install Apache on CentOS 7
hosts: pxg
remote_user: root # 使用root身份执行命令
tasks:
- name: Install Apache
yum:
name: httpd # Apache软件包名称
state: present # 安装Apache
when: ansible_os_family == 'RedHat' # 仅对Red Hat/CentOS系统执行
- name: Start Apache service
service:
name: httpd # Apache服务名称
state: started # 启动Apache服务
when: ansible_os_family == 'RedHat' # 仅对Red Hat/CentOS系统执行
...
###变量存在与否在回显提示###
- name: Conditional Task Execution
hosts: pxg
remote_user: root # 使用root身份执行命令
vars:
user: peng
home: /home/peng
tasks:
- name: Check if user is defined
debug:
msg: "user is defined"
when: user is defined
- name: Check if home is defined
debug:
msg: "home is defined"
when: home is defined
...
####判断发行版本然后停止httpd服务###
- name: 停止httpd服务
hosts: pxg
remote_user: root # 使用root身份执行命令
tasks:
- name: 获取发行版信息
ansible.builtin.setup:
filter: "ansible_distribution"
register: dist_info # register 关键字用于将任务执行的结果保存到一个变量(dist_info)中，然后可以使用这个变量的值在 playbook 中的其他地方进行处理。
- name: 停止httpd服务（如果发行版是CentOS或Fedora）
ansible.builtin.service:
name: httpd
state: stopped
when: dist_info.ansible_facts.ansible_distribution in ['CentOS', 'Fedora']
...
####判断根分区大小####
- name: Check Root Partition Space and Stop vsftpd
hosts: pxg
remote_user: root # 使用root身份执行命令
tasks:
- name: Get Root Partition Space
shell: df -h / | awk 'NR==2 {print $4}' # 获取根分区可用空间（以G为单位）
register: root_partition_space
- name: Stop vsftpd Service
systemd:
name: vsftpd
state: stopped
when: root_partition_space |int < 3 # 当可用空间小于3G时停止服务
handlers:
- name: Start vsftpd Service
systemd:
name: vsftpd
state: started
...