学习笔记2

使用远程用户执行命令的话

先在远程创建用户，其次复制ssh公钥到该用户的ssh目录下（密钥验证）

AD-HOC：
ansible test -m shell -a 'source ~/.bash_profile && echo $VAR'  -u wboss

playbook：
---
- hosts: all
  gather_facts: False
  remote_user: wboss
  tasks:
  - name: test user
    shell: touch ab.txt

Variables:
In an inventory file, a variable’s value is assigned using an equals sign:
foo=bar

In a playbook or variables include file, a variable’s value is assigned using a colon, like so:
foo: bar

Playbook Variables
Variablescanbepassedinviathecommandline,whencalling ansible-playbook ,withthe --extra-vars option:
ansible-playbook example.yml --extra-vars "foo=bar"

或者可以传递json，ymal格式的文件
like --extra-vars "@even_more_vars.json" or --extra-vars "@even_more_vars.yml

在playbook中使用vars section:
---
2 - hosts: example
3 vars:
4 foo: bar
5 tasks:
6 # Prints "Variable 'foo' is set to bar".
7 - debug: msg="Variable 'foo' is set to {{ foo }}"

或者使用文件
1 ---
2 # Main playbook file.
3 - hosts: example
4 vars_files:
5 - vars.yml
6 tasks:
7 - debug: msg="Variable 'foo' is set to {{ foo }}"

Inventory variables
1 # Host-specific variables (defined inline).
2 [washington]
3 app1.example.com proxy_state=present
4 app2.example.com proxy_state=absent
5
6 # Variables defined for the entire group.
7 [washington:vars]
8 cdn_host=washington.static.example.com
9 api_version=3.0.1

变量优先级
1. Variables from the command line ( -e in the command line) always win.
2. Connection variables defined in inventory ( ansible_ssh_user , etc.).
3. “Mosteverythingelse”(commandlineswitches,variablesdefinedinaplay,includedvariables,
role variables, etc.).
4. Other (non-connection) inventory variables.
5. Local facts and automatically discovered facts (via gather_facts ).
6. Role default variables (inside a role’s defaults/main.yml file).