When we use the playbook to write tasks, if an httpd needs to be installed repeatedly, we need to rewrite a yml in the playbook. The role can be defined separately for tasks, templates, etc. Store tasks and templates in separate directories. Multiple rules can be called together to achieve the realization of complex scenarios
role storage rules
Each role has its own corresponding directory structure for organization.
Step-by-step example
Take nginx as an example to realize that the ansible host provides the nginx anti-generation function, and the two back-end nginx servers provide access to static resources and dynamic resources respectively
1) Define the host list
[root@nginx ~]# cat /etc/ansible/hosts
[local_nginx]
11.2.3.25
[http_server]
11.2.3.63
[php_server]
11.2.2.228
2) Create the nginx folder under /etc/ansible/roles, and create directories such as tasks, template, var
[root@nginx ansible]# tree
.
├── ansible.cfg
├── hosts
├── nginx_roles.yaml
└── roles
└── nginx
├── default
├── files
│ ├── index.html
│ └── index.php
├── handlers
│ └── main.yaml
├── meta
├── tasks
│ └── main.yaml
├── templates
│ ├── php_server.conf.j2
│ ├── proxy_server.conf.j2
│ ├── server.conf.j2
│ └── www.conf.j2
└── vars
└── main.yaml
3) Examples of each file,
[root@nginx ansible]# cat roles/nginx/tasks/main.yaml
- name: install epel-release
yum: name=epel-release.noarch state=present
- name: install nginx
yum: name=nginx state=present
- name: start nginx
service: name=nginx state=started
- name: install php-fpm
yum: name=php-fpm state=present
when: ansible_hostname == 'php_nginx'
- name: start php-fpm
service: name=php-fpm state=started
when: ansible_hostname == 'php-fpm'
- name: install php-fpm_conf
template: src=www.conf.j2 dest=/etc/php-fpm.d/www.conf
notify: restart php-fpm
when: ansible_hostname == 'php_nginx'
- name: install http_server_conf
template: src=server.conf.j2 dest=/etc/nginx/conf.d/server.conf
notify: reload nginx
when: ansible_hostname == 'http_nginx'
- name: install php_server_conf
template: src=php_server.conf.j2 dest=/etc/nginx/conf.d/server.conf
notify: reload nginx
when: ansible_hostname == 'php_nginx'
- name: install proxy_nginx_conf
template: src=proxy_server.conf.j2 dest=/etc/nginx/conf.d/server.conf
notify: reload nginx
when: ansible_hostname == 'nginx'
- name: make directory
file: name={
{
index_root }} state=directory
- name: cp file
copy: src=index.html dest={
{
index_root }}
when: ansible_hostname == 'http_nginx'
- name: cp php_file
copy: src=index.php dest={
{
index_root }}
when: ansible_hostname == 'php_nginx'
[root@nginx nginx]# cat templates/proxy_server.conf.j2 #这是nginx作为反代的配置文件
server{
listen 80;
server_name {
{ domain_name }};
root {
{ index_root }};
location ~ .*\.(htm|html|gif|jpg|jpeg|png|bmp|swf|ioc|rar|zip|txt|flv|mid|doc|ppt|pdf|xls|mp3|wma){
index index.html;
proxy_pass http://{
{ http_server }};
}
location ~ .*\.php$ {
index index.php;
proxy_pass http://{
{ php_server }};
}
}
[root@nginx nginx]# cat templates/server.conf.j2 # 这是处理静态的nginx主机配置文件
server{
listen 80 default_server; #此处加了default_server，所以在tasks中需要也添加一个nginx.conf.j2的文件，将nginx.conf中的default_server去掉，避免影响冲突。
server_name {
{ domain_name }};
location /{
index index.html;
root {
{ index_root }};
}
}
[root@nginx nginx]# cat templates/php_server.conf.j2 #处理动态资源的nginx主机配置文件
server{
listen 80 default_server;
server_name {
{ domain_name }};
index index.php;
root {
{ index_root }};
location / {
root {
{ index_root }};
index index.php;
fastcgi_pass {
{ php_server }}:9000;
fastcgi_index index.php;
fastcgi_param SCRIPT_FILENAME {
{ index_root }}$fastcgi_script_name;
include fastcgi_params;
}
}
[root@nginx nginx]# cat templates/www.conf.j2 #这个是php-fpm的配置文件，可以根据自己修改
[root@nginx nginx]# cat vars/main.yaml #这个是变量设置文件
index_root: /data/root/
http_server: 11.2.3.63
php_server: 11.2.2.228
domain_name: www.ydong.com
[root@nginx nginx]# ls files/ #这个是后端nginx的网页
index.html index.php
Result after running directly
