ansible - 从入门到放弃

CLI

ansible               ansible-config        ansible-console-2     ansible-doc-2         ansible-galaxy-2      ansible-playbook      ansible-pull          ansible-vault
ansible-2             ansible-connection    ansible-console-2.7   ansible-doc-2.7       ansible-galaxy-2.7    ansible-playbook-2    ansible-pull-2        ansible-vault-2
ansible-2.7           ansible-console       ansible-doc           ansible-galaxy        ansible-inventory     ansible-playbook-2.7  ansible-pull-2.7      ansible-vault-2.7

cli 根据 ansible-* 切割，动态 import ansible.cli.*，parse -> run

如果是 ansible 命令，那么内部调用 AdHocCLI.run（点对点），直接 Play().load，然后扔给 tqm.run，例：

ansible localhost -m ping
ansible localhost -m setup
ansible all -i $host, -m command -a whoami

all 指 inventory 中的全部主机
如果直接指定 host 需要','隔开，只有一个也要
-m 是模块名，默认是 command
-a 是模块参数
默认是 key 登录，-k 使用密码登录

Inventory & Variables

Playbook

Playbooks are expressed in YAML format
Each playbook is composed of one or more ‘plays’ in a list.
The goal of a play is to map a group of hosts to some well defined roles, represented by things ansible calls tasks. At a basic level, a task is nothing more than a call to an ansible module

Playbook的构造函数只接收一个loader参数，有一个load静态方法用以设置_entries属性，该属性存储plays。
loader返回中间结果ds（dict-list），遍历ds，如果有import_playbook则执行PlaybookInclude.load并把结果extend进来，否则直接append Play.load

Play

class Play(Base, Taggable, Become)
A play is a language feature that represents a list of roles and/or task/handler blocks to execute on a given set of hosts.

Play也有个load方法，根据不同的类型，还有_load_tasks, _load_handlers, _load_roles，最终全部设置到_attributes字典中。
play最终会交由tqm执行（根据不同的strategy有不同的运行方式）。

Role

module

plugin