Shulou(Shulou.com)06/02 Report--

1. Introduction of ansible

Ansible is an automatic operation and maintenance tool, based on paramiko module development, used for batch execution of tasks and release work, is widely used in daily operation and maintenance work.

II. Ansible architecture

Architecture diagram:

Introduction of ansible core module:

Core models: modules included in ansible, file,shell,copy, etc.

Custom models: when the ansible built-in module is not enough to meet the needs of the work, the user adds an extension module

Host inventory: hosts managed by ansible, including hostname, ip, port, etc.

Playbook: yaml format file. Multi-tasks are defined in a yaml file, which mainly defines which functions are performed by which modules and are executed sequentially.

Connection plugins: ansible is connected to each target host through this plug-in, and the paramiko module ssh protocol is used internally by default

III. Ansible characteristics

The managed side does not need to install agnet, as long as the qualified python version is configured, and the ssh service no server only needs to install ansible software. after configuration, the command line can complete the work to develop new modules based on any language because the controlled side does not install agent software. The task module can only be pushed through the command side is idempotent, and if the defined task already exists, nothing will be done, which means that executing the same playbook multiple times on the same server has the same effect as once.

IV. Ansible task execution mode

1.ad-hoc mode

Single module, batch execution of single command

2.playbook mode

Batch execution of multiple tasks, multiple tasks to complete a large function, equivalent to multiple ad-hoc configuration files

V. Workflow

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