Ansible Automated Transport Koriyuki Yaml, base element

About YAML:

* YAML是一种用来表达资料序列的格式。YAML是YAML Ain‘t Markup Lanaguage的缩写，即YAML不是XML。* 特点：    1.具有很好的可续性，易于实现；    2.表达能力强，扩展性好；    3.和脚本语言的交互性好；    4.有一个一致的信息模型；    5.可以基于流来处理；

YAML Syntax:

* YAML的语法和其他语言类似，也可以表达散列表、标量等数据结构。* YAML结构通过空格来展示；序列里的项用“-”来代表；Map里的键值对用“：”来分割。YAML文件扩展名通常为：yaml，如：example.yaml* 基本语法规则：    1.大小写敏感    2.使用缩进表示层级关系    3.缩进时不允许使用Tab键，只允许使用空格。    4.缩进的空格数目不重要，只要相同层级的元素左侧对齐即可* 示例：name:zhangsanage:20name:lisiage:22people：-name:zhangsan      age:20      -name:lisi      age:22

Common Types of data:

YAML支持的数据结构：1.对象：键值对的集合，又称为映射（mapping）/ 哈希（hashes） / 字典（dictionary）   例如：name:Example Developer （键值）2.数组：一组按次序排列的值，又称为序列（sequence） / 列表（list）   例如：   -Apple   -Orange3.纯量：单个的、不可再分的值   例如：   number：10.10   sure：true

Ansible Basic elements:

**Ansible基本元素主要包括：Inventory（主机清单）、变量、条件测试****其中：*** **Inventory（主机清单）**：①、主机变量 ②、组变量 ③、组嵌套 ④、Inventory参数* **变量**：①、通过命令行传递变量 ②、通过roles传递变量* **条件测试**：when语句和迭代

Ansible Basic elements:

** Inventory（主机清单）*** Ansible为了更加便捷的管理主机，在主机清单中将被管理主机进行分组命名，默认的主机清单为/etc/ansible/hosts文件。* Inventory文件中以中括号中的字符标识为组名，将主机分组管理，也可以将同一主机同时划分到不同的组中。* 如：[webserver]192.168.72.129[mysql]192.168.72.130

**①, Host variables * * You can add host variables when you define them for use in subsequent playbook, such as: [Webserver]www1.magedu.com http_port=80 Maxrequestschild=808**②, group variables * * Group variables are variables that can be used directly in playbook for the specified host settings, such as: [Webserver]ntp_server=ntp.example.orgnfs_server=nfs.example.org**③, group nesting **[                          Tomcat]http.example.org[nginx]nginx.example.org[webserver:children]tomcatnginx**④, Inventory parameters * * Parameters Meaning Ansible_ssh_host//the remote hostname to which the connection is to be connected. This variable can be set with the alias of the host you want to set. Ansible_ssh_port SSH//port number. If it is not the default port number, this variable is set. ANSI Ble_ssh_user//default SSH username ansible_ssh_pass ssh//password (this method is not secure, we strongly recommend using--ask-pass or SSH key) ansible_ssh_private _key_file SSH//used private key file. Applies to multiple keys, and you don't want to use an SSH proxy. Ansible_ssh_common_args//This setting is appended to the default command line for SFTP,SCP and SSH ansible_sftp_e Xtra_args//This setting is appended to the default SFTP command line. Ansible_scp_extra_args//This setting is appended to the default SCP command line. Ansible_ssh_extra_args//This setting is attached to the default SSH command line. Ansible_ssh_pipelining//Determines whether to use the SSH pipeline. This can override the Ansible.cfg setting. The shell type of the Ansible_shell_type//target system. By default, the execution of the command uses the ' SH ' syntax, which can be set to ' csh ' or ' fish '. AnsiblThe python path of the E_python_interpreter//target host. The case: There are multiple python in the system, or the command path is not "/usr/bin/python", such as *bsd, or/usr/bin/pythonan Sible_*_interpreter//The "*" here can be a ruby or Perl or other language interpreter, function and Ansible_python_interpreter similar to ansible_shell_executable// This sets the shell that the Ansible controller will use on the target machine, overwriting the configuration in Ansible.cfg, which defaults to/bin/sh.

Ansible Automation Koriyuki Yaml, base element