Ansible varialbes
1.什么是变量?
? 以一个固定的字符串,表示一个不固定的值 version: 1.12
2.定义变量?
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1.在playbook中定义变量?
[root@manager project1]
- hosts: webservers
vars:
- file_name: playbook_vars
tasks:
- name: Create New File
file:
path: /tmp/{{ file_name }}
state: touch
[root@manage project]
[root@manager project1]
web_packages: httpd
ftp_packages: vsftpd
[root@manager project1]
- hosts: webservers
vars:
- file_name: playbook_vars
vars_files: ./vars_file.yml
tasks:
- name: Create New File
file:
path: /tmp/{{ file_name }}
state: touch
- name: Installed Packages {{ web_packages }}
yum:
name: "{{ web_packages }}"
state: present
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2.在inventory主机清单中定义变量?
[webservers]
172.16.1.7
172.16.1.8
[webservers:vars]
file_name=hostsfile_group_vars
- 2.创建hosts_vars group_vars 目录
[root@manager project1]
[root@manager project1]
[root@manager project1]
host_vars_name: 172.16.1.7
[root@manager project1]
host_vars_name: 172.16.1.8
[root@manager project1]
- hosts: webservers
tasks:
- name: Create New File
file:
path: /opt/{{ host_vars_name }}
state: touch
[root@manager project1]
group_host_vars: webservers
[root@manager project1]
- hosts: webservers
tasks:
- name: Create New File {{ group_host_vars }}
file:
path: /opt/{{ group_host_vars }}
state: touch
[root@manager project1]
group_host_vars: all
[root@manager project1]
- hosts: webservers
tasks:
- name: Create New File {{ group_host_vars }}
file:
path: /opt/{{ group_host_vars }}
state: touch
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3.通过外置传参定义变量? -e
[root@manager project1]
3.变量冲突,优先级?
6.定义相同的变量不同的值,来测试变量的优先级。操作步骤如下 file_name:
??1)在plabook中定义vars变量
??2)在playbook中定义vars_files变量
??3)在inventory主机定义变量
??4)在inventory主机组定义变量
??5)在host_vars中定义变量
??6)在group_vars中定义变量 组 all组
??7)通过执行命令传递变量
?
?
优先级测试:
外置传入参数优先级最高 ---> playbook ( vars_files(共享)--->vars(私有) )
---> host_vars --> group_vars/group_name ---> group_vars/all
4.变量注册?
[root@manager project1]
- hosts: webservers
tasks:
- name: Get Network Status
shell: netstat -lntp | grep "nginx"
register: System_Status
- name: Debug output Variables
debug:
msg: "{{ System_Status.stdout_lines }}"
5.facts变量
[root@manage project]
例如:
A: 1核心 work_process 1;
B: 2核心 work_process 2;
[root@manage project]
- hosts: webservers
tasks:
- name: Configure Nginx.conf
template:
src: ./file/nginx.conf.j2
dest: /etc/nginx/nginx.conf
[root@manage project]
worker_processes {{ ansible_processor_vcpus }};
zabbix_agent
Server: ===> 指向172.16.1.61
Hostname: web01 web02
[root@manager project1]
Server={{ zabbix_server_ip }}
ServerActive={{ zabbix_server_ip }}
Hostname={{ ansible_hostname }}
[root@manager project1]
- hosts: webservers
vars:
- zabbix_server_ip: 172.16.1.61
tasks:
- name: Configure zabbix-agent.conf
template:
src: ./file/zabbix_agent.conf.j2
dest: /tmp/zabbix-agent.conf
[root@manager project1]
- hosts: webservers
tasks:
- name: Installed Memcached Server
yum:
name: memcached
state: present
- name: Configure Memcached Server
template:
src: ./file/memcached.j2
dest: /etc/sysconfig/memcached
notify: Restart Memcached Server
- name: System Memcached Server
systemd:
name: memcached
state: started
enabled: yes
handlers:
- name: Restart Memcached Server
systemd:
name: memcached
state: restarted
[root@manager project1]
PORT="11211"
USER="memcached"
MAXCONN="1024"
CACHESIZE="{{ ansible_memtotal_mb //2 }}"
OPTIONS=""
[root@manage project]
- hosts: webservers
tasks:
- name: Centos Installed Httpd Server
yum:
name: httpd
state: present
when: ( ansible_distribution == "CentOS" )
- name: Ubuntu Installed Httpd Server
yum:
name: httpd
state: present
when: ( ansible_distribution == "Ubuntu" )
[root@manage project]
1.根据cpu
2.根据内存
3.根据主机名
4.Redis配置文件 bind本地地址
5.操作系统不统一
变量可以进行运算 + - * //
playbook
vars 私有
vars_files 共享
inventory
host_vars
group_vars
group_vars/group_name
group_vars/all
外置传参
-e
在不改变playbook变量的情况下,使用新的值测试.
1.将任务执行的结果存储至特定的变量中
2.可以使用debug模块将变量进行打印输出
python: 字典
json 格式化数据
{
k1: v1
k2: v2
}
[root@manager project1]
- hosts: webservers
tasks:
- name: RANDOM
shell: echo "$RANDOM"
register: System_SJ
- name: Debug
debug:
msg: "web_{{ System_SJ.stdout }}"
ansible_default_ipv4.address
[root@manager project1]
- hosts: webservers
tasks:
- name: Debug
debug:
msg: "web_{{ ansible_default_ipv4.address }}"
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