1.Playbook详解
playbook是一个非常简单的配置管理和多主机部署系统,可以定制配置,可以按照指定的操作步骤有序执行,支持同步和异步方式.
核心元素
Hosts:主机
Tasks:任务,由模板定义的操作列表
Variables:变量
Templates:模板,即使用模板语法的文件
Handlers:处理器,当某条件满足时,触发执行的操作
Roles:角色
cat test.yaml
- hosts: all
remote_user: root
tasks:
- name: install redis
yum: name=redis state=latest
- name: copy config file
copy: src=/root/playbook/redis.conf dest=/etc/redis.conf owner=redis
notify: restart redis
tags: ChangeConfigFile
- name: start redis
service: name=redis state=started
handlers:
- name: restart redis
service: name=redis state=restarted
# 检查yaml文件的语法是否正确
ansible-playbook test.yaml --syntax-check
# 检查tasks任务
ansible-playbook test.yaml --list-task
# 检查生效的主机
ansible-playbook test.yaml --list-hosts
# 干跑一遍
ansible-playbook -C test.yaml
# 指定从某个task开始运行
ansible-playbook test.yaml --start-at-task=‘Copy Nginx.conf‘
ansible-playbook test.yaml -t ChangeConfigFile
Handlers:如果触发了指定条件,则notify就会通知handlers执行对应操作.
2.引入变量
# 引用变量,收集主机facts变量
ansible-doc -s setup
ansible 10.0.0.51 -m setup
直接引用Ansible变量
- hosts: all
remote_user: root
tasks:
- name: copy file
copy: content={{ ansible_env }} dest=/opt/ansibel_env.txt
自定义变量
- hosts: all
remote_user: root
tasks:
- name: install package {{ pkgname }}
yum: name={{ pkgname }} state=latest
ansible-playbook -e pkgname=memcache -C forth.yaml
引用主机变量,在组的主机后面添加变量
[webservers]
10.0.0.51 ansibel_ssh_port=9122 ansibel_ssh_user=lixiang ansibel_ssh_pass=lixiang
10.0.0.52
第二种方式
[webservers:vars]
http_port=8080
三种调用方式示例
- hosts: webservers
remote_user: root
vars:
- pbvar: playbook Var test
tasks:
- name: command line var
copy: content={{ cmdvar }} dest=/tmp/cmd.var
- name: playbook var
copy: content={{ pbvar }} dest=/tmp/pb.var
- name: host iventory var
copy: content={{ http_port }} dest=/tmp/host.var
# cmdvar传值,中间有空格,会不识别
ansible-playbook -e cmdvar="command line var" vars.yaml
3.Templates介绍
# redis.conf.j2这个文件是从一个redis文件拷贝而来,修改了bind这一行
head /root/playbook/redis.conf.j2
bind {{ ansibel_eth0.ipv4.address4}}
cat templete.yaml
- hosts: webservers
remote_user: root
tasks:
- name: templete config file
templete: src=/root/playbook/redis.conf.j2 dest=/tmp/redis.conf
4.条件判断
条件测试-when语句:
tasks:
- name: install conf file to centos7
templete: src=/path/nginx.conf.c7.j2 dest=/etc/nginx/conf.d/nginx.conf
when: ansible_distribution_major_version == "7"
- name: install conf file to centos6
templete: src=/path/nginx.conf.c6.j2 dest=/etc/nginx/conf.d/nginx.conf
when: ansible_distribution_major_version == "6"
多条件判断
tasks:
- name: install conf file to centos7
templete: src=/path/nginx.conf.c7.j2 dest=/etc/nginx/conf.d/nginx.conf
when:
- ansible_distribution == "CentOS"
- ansible_distribution_major_version == "7"
组合条件判断
tasks:
- name: install conf file to centos7
templete: src=/path/nginx.conf.c7.j2 dest=/etc/nginx/conf.d/nginx.conf
when: (ansible_distribution == "CentOS" and ansible_distribution_major_version == "7" ) or
(ansible_distribution == "RedHat" and ansible_distribution_major_version == "7" )
迭代:有需要循环执行任务时,可以使用迭代机制
cat iter.yaml
- hosts: webservers
remote_user: root
tasks:
- name: install {{ item }} package
yum: name={{ item }} state=latest
with_item:
- nginx
- tomcat
- mariadb-server
- redis
5.角色(roles)
每个角色,以特定的层级目录结构进行组织.
mysql/
files/:存放由copy或script等模块调用的文件;
templetes/:templete模块查找所需要模板文件的目录;
tasks/:至少应该包含一个名为main.yml的文件,其它的文件需要在此文件中通过include进行包含;
handlers/:至少应该包含一个名为main.yml的文件,其它的文件需要在此文件中通过include进行包含;
vars/:至少应该包含一个名为main.yml的文件,其它的文件需要在此文件中通过include进行包含;
meta/:至少应该包含一个名为main.yml的文件,定义当前角色的特殊设定及其依赖关系,其它的文件需要在此文件中通过include进行包含;
default/:设定默认变量时使用此目录中的main.yaml文件.
原文：https://www.cnblogs.com/fawaikuangtu123/p/10889728.html