Ansible Study Notes

Ansible is based on modularity, with specific modules to complete specific tasks

Based on the Python language implementation, implemented by three key modules of Paramiko, Pyyaml and JINJA2

Simple deployment, agentless (no client deployment, client management via SSH protocol)

Based on master-slave mode

Supports custom modules (other programming language-written modules can also be called via Ansible interface)

Support Playbook continuous tasks in order of completion

Components of the Ansible:

Ansible core:ansible own Core module

Host Inventory: Master Library, defining a manageable list of hosts

Connection plugins: Connection plug-in, default SSH-based protocol connection

Modules:core modules (with module or core module), custom modules (user-defined module, users can write custom modules based on any programming language)

Configuration file:

(1) Main profile of the Ansible application:/etc/ansible/ansible.cfg

(2) Host Inventory definition control console:/etc/ansible/hosts

Installation: yum-y install epel-release yum-y Install Ansible

Use format for commands: Ansible

Vim/etc/ansible/ansible.cfg

Above is a sample custom single host

To customize a single group example, the characters in brackets are group names, and a host can belong to more than one master

You can use Ansible-i/somefile to indicate the inventory host file path

customizing two groups

Ansible-doc commands to see the Help, Ansible-doc-l lists which modules ansible support, Ansible-doc-s module-name See what the module supports

Parameters

The simplest command: ansible web1-m Ping, because SSH is not based on key authentication, this is shown here unreachable

First you have to configure the key verification on each host, first create a key pair, the command is simple Ssh-keygen, add three times enter

Cat/root/.ssh/id_rsa.pub >/root/.ssh/authorized_keys chmod 700/root/.ssh/authorized_keys

Scp-p/root/.ssh/authorized_keys 192.168.238.170:/root/.ssh/(the key is sent to each host via SCP)

At this point, test ansible all-m Ping All to indicate that all hosts

Ansible Common Module Introduction

Ansible

Args: is the key=value format

Command: Default module, can be omitted. Operation command on the remote host, command not key=value format, followed directly

Example: Ansible all-m command-a ' ifconfig '

Note: command cannot be executed for pipe class

User: Add Delete user command

For example: Ansible web1-m user-a "Name=apache state=present" name specifies user name, present means create, absent means delete

To delete a home directory, to use Remove=true, create a system user to add System=true

Cron defines the entries in the Crontab

Example: Ansible all-m cron-a "minute= ' */5 ' job= '/usr/sbin/ntpdate 210.72.145.44 &>/dev/null ' name= ' Sync Time '"

The name above must specify

Delete: ansible all-m cron-a "name= ' Sync Time ' state=absent", additional parameters month= day= weekday=

File Settings Files Properties

Example: Ansible web1-m file-a "Path=/tmp/dir state=directory" Create dir directory

Ansible web1-m file-a "Path=/tmp/nihao owner=root state=touch" Create a Nihao empty file

Yum Package Manager

Example: Ansible web1-m yum-a "name=httpd state=present" Install httpd package

Copy complete File replication

Example: Ansible all-m copy-a ' src=/etc/fstab dest=/tmp/fstab mode=100 ' src Specifies the local file absolute path, dest specifies that the target host is absolutely

The path

Service startup shuts down individual services

Example: Ansible web1-m service-a ' name=httpd state=started enabled=true ' Start HTTP service, enabled=true specify boot

Shell runs shell commands in the shell environment

Example: ansible all-m shell-a ' echo "0" | passwd--stdin Root '

Script specifies a local scripting file that is passed to the remote host for execution once

vim/tmp/date.sh

Example: Ansible all-m script-a '/tmp/date.sh ' executes a script on all hosts to set the time zone

Ansible Study Notes