ansible入门

ansible入门

一.ansible 背景介绍

• Ansible 是一个广受欢迎的 IT 自动化系统。可以用来处理配置管理、应用自动化部署、云资源配给、网络
  自动化和多借点部署等任务。其也可以使得复杂的变更如带负载均衡的零停机滚动更新更加容易。Ansible.com

1.1 自动化运维概念

1.1.1 运维自动化的内容

• 运维自动化是指将 IT 运维中的大量手工的日常任务(日常检查、配置变更、软件安装等)转为自动化完成。
  高度的自动化是 IT 运维追求的目标，是未来 IT 运维发展的趋势。简单的说，IT 自动化就是基于事先建立的
  框架和流程，将某些不可预测的事件与 IT 流程关联起来，一旦某个系统一有风吹草动，就会被相应的监控
  系统检测到，并根据相关的预定义的流程执行相应的补救措施，这些自动补救的措施都是在无人干涉的情
  况下自动完成的。从而大幅减少系统不可用时间。

1.1.2 运维工程师核心职能

• 平台架构组件
  负责参与并审核架构设计的合理性和可运维性，搭建运维平台技术架构，通过开源解决方案，以确保在
  产品发布之后能高效稳定的运行，保障并不断提升服务的可用性，确保用户数据安全，提升用户体验。

• 日常运营保障
  负责用运维技术或者运维平台确保产品可以高效的发布上线，负责保障产品 7*24H 稳定运行，在此期间
  对出现的各种问题可以快速定位并解决;在日常工作中不断优化系统架构和部署的合理性，以提升系统服务
  的稳定性。

• 性能、效率优化
  用自动化的工具/平台提升软件在研发生命周期中的工程效率。不断优化系统架构、提升部署效率、优化
  资源利用率支持产品的不断迭代，需要不断的进行架构优化调整。以确保整个产品能够在功能不断丰富和
  复杂的条件下，同时保持高可用性。

  运维开发工程师的职能和使用的工具

• 对于运维工程师来说，掌握这些自动化运维工具并能够相应的扩展功能是必备的技能。

1.2 常见自动化运维工具介绍

• 常见自动化运维工具在 Github 的受欢迎程度–统计于 2019.12.8

自动化运维工具	Github Watch	Star	Fork	Contributors	Used by	Build language
Ansible	2000	40800	17700	4800	9400	Python
Saltstack	596	10500	4700	2163	not included	Python
Puppet	489	5600	2100	528	7300	Ruby
Chef	420	6000	2400	581	5800	Ruby
Fabric	519	11900	1800	9	not include	Python

• 能看出 ansible 和 saltstack 是比较受欢迎的工具。

• 各工具的源码托管地址：
  Github-Ansible
  Github-Saltstack
  Github-Puppet
  Github-Chef
  Github-Fabric

1.3 ansible 背景

• Ansible 由 Michael DeHaan(Cobbler 与 Func 作者)使用 Python 在 2012 年开发，ansible 的名称来自
  《安德的游戏》中跨越时空的即时通信工具。 于 2012-03-09，发布 0.0.1 版。在 2015-10-17，Red Hat
  宣布 1.5 亿美元收购 Ansible。新版本的 RedHt 系统集成 Ansible。可以工作在 Linu、BSD、Mac OS 等
  平台，目前是三大自动化运维工具(Ansible,Saltstack,Puppet)中最受欢迎的工具。

• Andible 官网和官方文档
  官网
  官方文档
  Ansible 中文文档

• Michael DeHaan 信息和博客
  Linkedin-MichaelDehaan
  Medium
  ansible.com

二.ansible 特性介绍

• ansible 特性
  • 模块化：调用特定的模块，完成特定任务
  • Paramiko（python 对 ssh 的实现），PyYAML，Jinja2（模板语言）三个关键模块
  • 支持自定义模块，可使用任何编程语言写模块
  • 基于 Python 语言实现
  • 部署简单，基于 python 和 SSH(默认已安装)，agentless，无需代理不依赖 PKI（无需 ssl），
    去中心化部署
  • 安全，基于 OpenSSH
  • 幂等性：一个任务执行 1 遍和执行 n 遍效果一样，不因重复执行带来意外情况
  • 支持 playbook 编排任务，YAML 格式，编排任务，支持丰富的数据结构
  • 较强大的多层解决方案 role

三.ansible 架构介绍

3.1 Ansible 整体架构

Ansible 整体架构

3.2 Ansible 的核心模块

• ansible 核心模块包括：
  INVENTRY:ansible 控制和管理的主机清单默认使用的文件为/etc/ansible/hosts
  API: 供第三方程序调用的应用程序编程接口
  MODULES:ansible 执行命令的功能模块，多数为内置核心，也可以自定义(基于 Python)
  PLUGINS:模块功能的补充，如连接类的插件、循环插件、过滤插件等。

• ANSIBLE 命令执行来源
  USER:普通用户，即 SYSTEM ADMINISTRATOR
  PLAYBOOKS:任务剧本（任务集），编排定义 Ansible 任务集的配置文件，由 Ansible 顺序依次
  执行，通常是 JSON 格式的 YML 文件
  CMDB(配置管理数据库): API 调用
  PUBLIC/PRIVATE CLOUD: API 调用
  USER-> Ansible Playbook -> Ansibile

• Tips
  执行 ansible 的主机一般称为主控端，中控，master 或堡垒机
  主控端 Python 版本需要 2.6 或以上
  被控端 Python 版本小于 2.4 需要安装 python-simplejson
  被控端如开启 SELinux 需要安装 libselinux-python
  windows 不能做为主控端

四.Ansible 安装和入门

4.1 Ansible 安装

• RedHat 系列系统配置各版本的 epel 源直接 yum 安装
  yum install ansible

• 编译安装

$yum -y install python-jinja2 PyYAML python-paramiko python-babel python-crypto
$tar xf ansible-1.5.4.tar.gz
$cd ansible-1.5.4
$python setup.py build
$python setup.py install
$mkdir /etc/ansible
$cp -r examples/* /etc/ansible

• Git 安装

$git clone git://github.com/ansible/ansible.git --recursive
$cd ./ansible
$source ./hacking/env-setup

• 使用 Python 包管理器 pip 安装

yum install python-pip python-devel
yum install gcc glibc-devel zibl-devel  rpm-bulid openssl-devel
pip install  --upgrade pip
pip install ansible --upgrade

4.2 Ansible 配置

• 相关配置文件

/etc/ansible/ansible.cfg 主配置文件，配置 ansible 工作特性
/etc/ansible/hosts       默认的Inventory主机清单
/etc/ansible/roles/      存放角色的目录

• Ansible 主配置文件/etc/ansible/ansible.cfg

# config file for ansible -- https://ansible.com/
# ===============================================

# nearly all parameters can be overridden in ansible-playbook
# or with command line flags. ansible will read ANSIBLE_CONFIG,
# ansible.cfg in the current working directory, .ansible.cfg in
# the home directory or /etc/ansible/ansible.cfg, whichever it
# finds first

[defaults]

# some basic default values...

#inventory      = /etc/ansible/hosts
#library        = /usr/share/my_modules/
#module_utils   = /usr/share/my_module_utils/
#remote_tmp     = ~/.ansible/tmp
#local_tmp      = ~/.ansible/tmp
#plugin_filters_cfg = /etc/ansible/plugin_filters.yml
#forks          = 5
#poll_interval  = 15
#sudo_user      = root
#ask_sudo_pass = True
#ask_pass      = True
#transport      = smart
#remote_port    = 22
#module_lang    = C
#module_set_locale = False


# implicit - gather by default, turn off with gather_facts: False
# explicit - do not gather by default, must say gather_facts: True
#gathering = implicit | explicit
#gather_subset = all | network | hardware | virtual | facter | ohai
# gather_timeout = 10
# inject_facts_as_vars = True
#roles_path    = /etc/ansible/roles
#host_key_checking = False
host_key_checking = False
#stdout_callback = skippy
#callback_whitelist = timer, mail
#task_includes_static = False
#handler_includes_static = False
#error_on_missing_handler = True
#sudo_exe = sudo
#sudo_flags = -H -S -n

# SSH timeout
#timeout = 10

# default user to use for playbooks if user is not specified
# (/usr/bin/ansible will use current user as default)
#remote_user = root

# logging is off by default unless this path is defined
# if so defined, consider logrotate
log_path = /var/log/ansible.log

# default module name for /usr/bin/ansible
module_name = shell

# use this shell for commands executed under sudo
# you may need to change this to bin/bash in rare instances
# if sudo is constrained
#executable = /bin/sh

# if inventory variables overlap, does the higher precedence one win
# or are hash values merged together?  The default is 'replace' but
# this can also be set to 'merge'.
#hash_behaviour = replace

# by default, variables from roles will be visible in the global variable
# scope. To prevent this, the following option can be enabled, and only
# tasks and handlers within the role will see the variables there
#private_role_vars = yes

# list any Jinja2 extensions to enable here:
#jinja2_extensions = jinja2.ext.do,jinja2.ext.i18n

# if set, always use this private key file for authentication, same as
# if passing --private-key to ansible or ansible-playbook
#private_key_file = /path/to/file

# If set, configures the path to the Vault password file as an alternative to
# specifying --vault-password-file on the command line.
#vault_password_file = /path/to/vault_password_file

# format of string {{ ansible_managed }} available within Jinja2
# templates indicates to users editing templates files will be replaced.
# replacing {file}, {host} and {uid} and strftime codes with proper values.
#ansible_managed = Ansible managed: {file} modified on %Y-%m-%d %H:%M:%S by {uid} on {host}
# {file}, {host}, {uid}, and the timestamp can all interfere with idempotence
# in some situations so the default is a static string:
#ansible_managed = Ansible managed

#display_skipped_hosts = True
#display_args_to_stdout = False
#error_on_undefined_vars = False
#system_warnings = True
#deprecation_warnings = True
# command_warnings = False

# set plugin path directories here, separate with colons
#action_plugins     = /usr/share/ansible/plugins/action
#cache_plugins      = /usr/share/ansible/plugins/cache
#callback_plugins   = /usr/share/ansible/plugins/callback
#connection_plugins = /usr/share/ansible/plugins/connection
#lookup_plugins     = /usr/share/ansible/plugins/lookup
#inventory_plugins  = /usr/share/ansible/plugins/inventory
#vars_plugins       = /usr/share/ansible/plugins/vars
#filter_plugins     = /usr/share/ansible/plugins/filter
#test_plugins       = /usr/share/ansible/plugins/test
#terminal_plugins   = /usr/share/ansible/plugins/terminal
#strategy_plugins   = /usr/share/ansible/plugins/strategy

#strategy = free
#bin_ansible_callbacks = False
#nocows = 1
#cow_selection = default
#cow_selection = random
#cow_whitelist=bud-frogs,bunny,cheese,daemon,default,dragon,elephant-in-snake,elephant,eyes,\
#              hellokitty,kitty,luke-koala,meow,milk,moofasa,moose,ren,sheep,small,stegosaurus,\
#              stimpy,supermilker,three-eyes,turkey,turtle,tux,udder,vader-koala,vader,www
#nocolor = 1
#fact_caching = memory
#For the redis plugin, the value is a host:port:database triplet: fact_caching_connection = localhost:6379:0
#fact_caching_connection=/tmp
#retry_files_enabled = False
#retry_files_save_path = ~/.ansible-retry
#squash_actions = apk,apt,dnf,homebrew,pacman,pkgng,yum,zypper

# prevents logging of task data, off by default
#no_log = False

# prevents logging of tasks, but only on the targets, data is still logged on the master/controller
#no_target_syslog = False

# controls whether Ansible will raise an error or warning if a task has no
# choice but to create world readable temporary files to execute a module on
# the remote machine.  This option is False by default for security.  Users may
# turn this on to have behaviour more like Ansible prior to 2.1.x.  See
# https://docs.ansible.com/ansible/become.html#becoming-an-unprivileged-user
# for more secure ways to fix this than enabling this option.
#allow_world_readable_tmpfiles = False

# controls the compression level of variables sent to
# worker processes. At the default of 0, no compression
# is used. This value must be an integer from 0 to 9.
#var_compression_level = 9

# controls what compression method is used for new-style ansible modules when
# they are sent to the remote system.  The compression types depend on having
# support compiled into both the controller's python and the client's python.
# The names should match with the python Zipfile compression types:
# * ZIP_STORED (no compression. available everywhere)
# * ZIP_DEFLATED (uses zlib, the default)
# These values may be set per host via the ansible_module_compression inventory
# variable
#module_compression = 'ZIP_DEFLATED'

# This controls the cutoff point (in bytes) on --diff for files
# set to 0 for unlimited (RAM may suffer!).
#max_diff_size = 1048576

# This controls how ansible handles multiple --tags and --skip-tags arguments
# on the CLI.  If this is True then multiple arguments are merged together.  If
# it is False, then the last specified argument is used and the others are ignored.
# This option will be removed in 2.8.
#merge_multiple_cli_flags = True

# Controls showing custom stats at the end, off by default
#show_custom_stats = True

# Controls which files to ignore when using a directory as inventory with
# possibly multiple sources (both static and dynamic)
#inventory_ignore_extensions = ~, .orig, .bak, .ini, .cfg, .retry, .pyc, .pyo

# This family of modules use an alternative execution path optimized for network appliances
# only update this setting if you know how this works, otherwise it can break module execution
#network_group_modules=eos, nxos, ios, iosxr, junos, vyos

# When enabled, this option allows lookups (via variables like {{lookup('foo')}} or when used as
# a loop with `with_foo`) to return data that is not marked "unsafe". This means the data may contain
# jinja2 templating language which will be run through the templating engine.
# ENABLING THIS COULD BE A SECURITY RISK
#allow_unsafe_lookups = False

# set default errors for all plays
#any_errors_fatal = False

[inventory]
# enable inventory plugins, default: 'host_list', 'script', 'yaml', 'ini', 'auto'
#enable_plugins = host_list, virtualbox, yaml, constructed

# ignore these extensions when parsing a directory as inventory source
#ignore_extensions = .pyc, .pyo, .swp, .bak, ~, .rpm, .md, .txt, ~, .orig, .ini, .cfg, .retry

# ignore files matching these patterns when parsing a directory as inventory source
#ignore_patterns=

# If 'true' unparsed inventory sources become fatal errors, they are warnings otherwise.
#unparsed_is_failed=False

[privilege_escalation]
#become=True
#become_method=sudo
#become_user=root
#become_ask_pass=False

[paramiko_connection]

# uncomment this line to cause the paramiko connection plugin to not record new host
# keys encountered.  Increases performance on new host additions.  Setting works independently of the
# host key checking setting above.
#record_host_keys=False

# by default, Ansible requests a pseudo-terminal for commands executed under sudo. Uncomment this
# line to disable this behaviour.
#pty=False

# paramiko will default to looking for SSH keys initially when trying to
# authenticate to remote devices.  This is a problem for some network devices
# that close the connection after a key failure.  Uncomment this line to
# disable the Paramiko look for keys function
#look_for_keys = False

# When using persistent connections with Paramiko, the connection runs in a
# background process.  If the host doesn't already have a valid SSH key, by
# default Ansible will prompt to add the host key.  This will cause connections
# running in background processes to fail.  Uncomment this line to have
# Paramiko automatically add host keys.
#host_key_auto_add = True

[ssh_connection]

# ssh arguments to use
# Leaving off ControlPersist will result in poor performance, so use
# paramiko on older platforms rather than removing it, -C controls compression use
#ssh_args = -C -o ControlMaster=auto -o ControlPersist=60s

# The base directory for the ControlPath sockets.
# This is the "%(directory)s" in the control_path option
#
# Example:
# control_path_dir = /tmp/.ansible/cp
#control_path_dir = ~/.ansible/cp

# The path to use for the ControlPath sockets. This defaults to a hashed string of the hostname,
# port and username (empty string in the config). The hash mitigates a common problem users
# found with long hostames and the conventional %(directory)s/ansible-ssh-%%h-%%p-%%r format.
# In those cases, a "too long for Unix domain socket" ssh error would occur.
#
# Example:
# control_path = %(directory)s/%%h-%%r
#control_path =

# Enabling pipelining reduces the number of SSH operations required to
# execute a module on the remote server. This can result in a significant
# performance improvement when enabled, however when using "sudo:" you must
# first disable 'requiretty' in /etc/sudoers
#
# By default, this option is disabled to preserve compatibility with
# sudoers configurations that have requiretty (the default on many distros).
#
#pipelining = False

# Control the mechanism for transferring files (old)
#   * smart = try sftp and then try scp [default]
#   * True = use scp only
#   * False = use sftp only
#scp_if_ssh = smart

# Control the mechanism for transferring files (new)
# If set, this will override the scp_if_ssh option
#   * sftp  = use sftp to transfer files
#   * scp   = use scp to transfer files
#   * piped = use 'dd' over SSH to transfer files
#   * smart = try sftp, scp, and piped, in that order [default]
#transfer_method = smart

# if False, sftp will not use batch mode to transfer files. This may cause some
# types of file transfer failures impossible to catch however, and should
# only be disabled if your sftp version has problems with batch mode
#sftp_batch_mode = False

# The -tt argument is passed to ssh when pipelining is not enabled because sudo
# requires a tty by default.
#use_tty = True

# Number of times to retry an SSH connection to a host, in case of UNREACHABLE.
# For each retry attempt, there is an exponential backoff,
# so after the first attempt there is 1s wait, then 2s, 4s etc. up to 30s (max).
#retries = 3

[persistent_connection]

# Configures the persistent connection timeout value in seconds.  This value is
# how long the persistent connection will remain idle before it is destroyed.
# If the connection doesn't receive a request before the timeout value
# expires, the connection is shutdown. The default value is 30 seconds.
#connect_timeout = 30

# Configures the persistent connection retry timeout.  This value configures the
# the retry timeout that ansible-connection will wait to connect
# to the local domain socket. This value must be larger than the
# ssh timeout (timeout) and less than persistent connection idle timeout (connect_timeout).
# The default value is 15 seconds.
#connect_retry_timeout = 15

# The command timeout value defines the amount of time to wait for a command
# or RPC call before timing out. The value for the command timeout must
# be less than the value of the persistent connection idle timeout (connect_timeout)
# The default value is 10 second.
#command_timeout = 10

[accelerate]
#accelerate_port = 5099
#accelerate_timeout = 30
#accelerate_connect_timeout = 5.0

# The daemon timeout is measured in minutes. This time is measured
# from the last activity to the accelerate daemon.
#accelerate_daemon_timeout = 30

# If set to yes, accelerate_multi_key will allow multiple
# private keys to be uploaded to it, though each user must
# have access to the system via SSH to add a new key. The default
# is "no".
#accelerate_multi_key = yes

[selinux]
# file systems that require special treatment when dealing with security context
# the default behaviour that copies the existing context or uses the user default
# needs to be changed to use the file system dependent context.
#special_context_filesystems=nfs,vboxsf,fuse,ramfs,9p

# Set this to yes to allow libvirt_lxc connections to work without SELinux.
#libvirt_lxc_noseclabel = yes

[colors]
#highlight = white
#verbose = blue
#warn = bright purple
#error = red
#debug = dark gray
#deprecate = purple
#skip = cyan
#unreachable = red
#ok = green
#changed = yellow
#diff_add = green
#diff_remove = red
#diff_lines = cyan

[diff]
# Always print diff when running ( same as always running with -D/--diff )
# always = no

# Set how many context lines to show in diff
# context = 3

• Ansible 默认被控主机清单/etc/ansible/hosts
• ansible 的主要功用在于批量主机操作，为了便捷地使用其中的部分主机，可以在 inventory file 中将其
  分组命名。默认的 inventory file 为/etc/ansible/hosts，inventory file 可以有多个，且也可以通过
  Dynamic Inventory 来动态生成
• 主机清单文件格式
  inventory 文件遵循 INI 文件风格，中括号中的字符为组名。可以将同一个主机同时归并到多个不同的组中。
  此外， 当如若目标主机使用了非默认的 SSH 端口，还可以在主机名称之后使用冒号加端口号来标明如果
  主机名称遵循相似的命名模式，还可以使用列表的方式标识各主机。如下面的例子:

# websrvs 组的主机清单
[websrvs]
172.20.1.67
172.20.1.68
172.20.1.69

# websrvs 组的主机变量
[websrvs:vars]
web67=172.20.1.67
web68=172.20.1.68
web69=172.20.1.69

# appsrvs 组的主机清单
[appsrvs]
172.20.1.84
172.20.1.86
172.20.1.87

# appsrvs 组的主机变量
[appsrvs:vars]
app84=172.20.1.84
app86=172.20.1.86
app87=172.20.1.87

# dnssrvs 组的主机清单
[dnssrvs]
172.20.1.79
172.20.1.88
172.20.1.89

# dnssrvs 组的主机别名(变量)
[dnssrvs:vars]
dns79=172.20.1.79
dns88=172.20.1.88
dns89=172.20.1.89

4.3 Ansible 附带的工具

• 安装 Ansible 时会附带一些必要的工具
• 加粗的工具经常使用，其它不常使用

/usr/bin/ansible	主程序，临时命令执行工具
/usr/bin/ansible-doc	查看配置文档，模块功能查看工具
/usr/bin/ansible-galaxy	下载/上传优秀代码或 Roles 模块的官网平台
/usr/bin/ansible-playbook	定制自动化任务，编排剧本工具
/usr/bin/ansible-pull	远程执行命令的工具
/usr/bin/ansible-vault	文件加密工具
/usr/bin/ansible-console	基于 Console 界面与用户交互的执行工具

• ansible-doc 命令，用来显示个模块的帮助，一般直接跟模块名即可

ansible-doc [options] [module...]
-l, --list          #列出可用模块
-s, --snippet       #显示指定模块的playbook片段
#列出所有模块
ansible-doc -l  
#查看指定模块帮助用法
ansible-doc ping  
#查看指定模块帮助用法
ansible-doc -s  pin

eg:
root@ubuntu1904:~#ansible-doc ping -s
- name: Try to connect to host, verify a usable python and return `pong' on success
  ping:
      data:                  # Data to return for the `ping' return value. If this parameter is set to `crash', the module will cause an exception.

4.4 ansible 命令

• ansible 命令通过 ssh 协议，实现对远程主机的配置管理、应用部署、任务执行等功能，使用-k 选项来输入
  远程主机的密码。由于每台主机的密码可能不一样。建议：使用此工具前，先配置 ansible 主控端能基于
  密钥认证的方式联系各个被管理节点。如下面的脚本可以实现 ansible 主控机与被控主机基于 Key 验证
  范例：利用 sshpass 批量实现基于 key 验证

#!/bin/bash
#
#*******************************************************************************
#Author:            steveli
#QQ:                1049103823
#Data:              2019-12-08
#FileName:          key_cert.sh
#URL:               https://blog.csdn.net/YouOops
#Description:       Test scrpting.
#Copyright (C):     2019 All rights reserved
#*******************************************************************************
ssh-keygen -f /root/.ssh/id_rsa  -P ''
NET=172.20.1
export SSHPASS=stevenux
for IP in {80..99}; do
    sshpass -e ssh-copy-id  ${NET}.${IP}
done

• ansible 命令用法

ansible [ options [-m module_name] [-a args] ]

• options

--version           #显示版本
-m module           #指定模块，默认为command
-v                  #详细过程 –vv  -vvv更详细
--list-hosts        #显示主机列表，可简写 --list
-k, --ask-pass      #提示输入ssh连接密码，默认Key验证
-C, --check         #检查，并不执行
-T, --timeout=TIMEOUT #执行命令的超时时间，默认10s
-u, --user=REMOTE_USER #执行远程执行的用户
-b, --become        #代替旧版的sudo 切换
--become-user=USERNAME  #指定sudo的runas用户，默认为root
-K, --ask-become-pass  #提示输入sudo时的口令

• 用于匹配控制的主机列表，筛选出特定的主机来执行特定任务

模式	意义	例子
all	所有 Inventory 中定义的主机	ansible all –m ping
*	通配符	ansible “*” -m ping
		ansible 192.168.1.* -m ping
		ansible “websrvss” -m ping
:	逻辑或关系	ansible “webwebsrvss:appwebsrvss” -m ping
		ansible “192.168.1.10:192.168.1.20” -m ping
:&	逻辑与关系	ansible “webwebsrvss:&dbwebsrvss” –m ping #在 webwebsrvss 组并且在 dbwebsrvss 组中的主机
:!	逻辑非关系	ansible ‘webwebsrvss:!dbwebsrvss’ –m ping #在 webwebsrvss 组，但不在 dbwebsrvss 组中的主机。 注意：此处为单引号
正则表达式		ansible “webwebsrvss:&dbwebsrvss” –m ping
正则表达式		ansible “~(web | db).*.magedu.com” –m ping

• Ansible 实际管理的主要方式有两种

1.Ad-Hoc 方式，即是利用 ansible 命令临时管理的方式
2.Ansible-playbook 命令，用于长期规划好的大型项目使用，需要编写相应的 playbook

• ansible 命令执行过程

1. 加载自己的配置文件 默认/etc/ansible/ansible.cfg
2. 加载自己对应的模块文件，如：command
3. 通过 ansible 将模块或命令生成对应的临时 py 文件，并将该文件传输至远程服务器的对应执行用户
   $HOME/.ansible/tmp/ansible-tmp-数字/XXX.PY 文件
4. 给文件加执行权限执行
5. 执行并返回结果
6. 删除临时 py 文件，退出

• ansible 执行后返回状态可以在配置文件自定义/ect/ansible/ansible.cfg
  green:绿色表示执行成功且不需要做改变
  yellow:执行成功并且对被控主机有改动
  red:执行失败

root@ubuntu1904:~#grep -A 15 '\[colors\]' /etc/ansible/ansible.cfg
[colors]
#highlight = white
#verbose = blue
#warn = bright purple
#error = red
#debug = dark gray
#deprecate = purple
#skip = cyan
#unreachable = red
#ok = green
#changed = yellow
#diff_add = green
#diff_remove = red
#diff_lines = cyan

• ansible 使用范例

#以stevenux用户执行ping存活检测
ansible all -m ping -u stevenux  -k
#以stevenux sudo至root执行ping存活检测
ansible all -m ping -u stevenux -k -b
#以stevenux sudo至mage用户执行ping存活检测
ansible all -m ping -u stevenux -k -b --become-user=mage
#以stevenux sudo至root用户执行ls
ansible all -m command  -u stevenux -a 'ls /root' -b --become-user=root -k -K

• ansible-galaxy 此工具用来下载网上的 roles
  此工具连接到:galaxy.ansibl.com下载 roles
  下载的 roles 默认放到~/.ansible/roles

#列出所有已安装的galaxy
ansible-galaxy list

#安装galaxy
ansible-galaxy install geerlingguy.redis

root@ubuntu1904:~/.ansible#tree roles/
roles/
└── geerlingguy.redis
    ├── defaults
    │   └── main.yml
    ├── handlers
    │   └── main.yml
    ├── LICENSE
    ├── meta
    │   └── main.yml
    ├── README.md
    ├── tasks
    │   ├── main.yml
    │   ├── setup-Archlinux.yml
    │   ├── setup-Debian.yml
    │   └── setup-RedHat.yml
    ├── templates
    │   └── redis.conf.j2
    ├── tests
    │   ├── README.md
    │   └── test.yml
    └── vars
        ├── Archlinux.yml
        ├── Debian.yml
        └── RedHat.yml

#删除galaxy
ansible-galaxy remove geerlingguy.redis

• ansible-pull
  此工具会推送 ansible 的命令至远程，效率无限提升，对运维要求较高

• ansible-playbook
  此工具用于执行编写好的 playbook 任务

• Playbook 例子

root@ubuntu1904:~#cat .ansible/roles/geerlingguy.redis/tasks/main.yml
---
# Variable setup.
- name: Include OS-specific variables.
  include_vars: "{{ ansible_os_family }}.yml"

- name: Define redis_package.
  set_fact:
    redis_package: "{{ __redis_package }}"
  when: redis_package is not defined

# Setup/install tasks.
- include_tasks: setup-RedHat.yml
  when: ansible_os_family == 'RedHat'

- include_tasks: setup-Debian.yml
  when: ansible_os_family == 'Debian'

- include_tasks: setup-Archlinux.yml
  when: ansible_os_family == 'Archlinux'

- name: Ensure Redis is configured.
  template:
    src: redis.conf.j2
    dest: "{{ redis_conf_path }}"
    mode: 0644
  notify: restart redis

- name: Ensure Redis is running and enabled on boot.
  service: "name={{ redis_daemon }} state=started enabled=yes"

• ansible-vault
  此工具可以用于加和密解密 yml 文件
  ansible-vault [create|decrypt|edit|encrypt|rekey|view]
  例子：

ansible-vault encrypt hello.yml     #加密
ansible-vault decrypt hello.yml     #解密
ansible-vault view hello.yml        #查看
ansible-vault edit  hello.yml       #编辑加密文件
ansible-vault rekey  hello.yml      #修改口令
ansible-vault create new.yml        #创建新文件

• ansible-console
  • 此工具可交互执行命令，支持 tab，ansible 2.0+新增的功能
  • 进入交互界面后的提示符格式：
    执行用户@当前操作的主机组 (当前组的主机数量)[f:并发数]$
  • 常用子命令
    设置并发数： forks n 例如： forks 10
    切换组： cd 主机组 例如： cd web
    列出当前组主机列表： list
    列出所有的内置命令： ?或 help

root@ubuntu1904:~#ansible-console
Welcome to the ansible console.
Type help or ? to list commands.

root@all (9)[f:5]$ ls
172.20.1.68 | CHANGED | rc=0 >>
anaconda-ks.cfg
auto_install_mysql_v03.sh
hello.txt
......
oot@all (9)[f:5]$ pwd
172.20.1.67 | CHANGED | rc=0 >>
/root
172.20.1.68 | CHANGED | rc=0 >>
/root
172.20.1.69 | CHANGED | rc=0 >>
/root
......
root@all (9)[f:5]$ list
172.20.1.67
172.20.1.68
172.20.1.69
172.20.1.79
172.20.1.88
172.20.1.89
172.20.1.84
172.20.1.86
172.20.1.87

4.5 Ansible 常用模块使用

常用模块参考

4.5.1 Command 模块

• 功能: 在远程主机执行命令，此为默认模块，可忽略-m 选项

• 注意点: 此命令不支持 $VARNAME < > | ; & 等符号和相应功能，用 shell 模块实现

• 例子:

root@ubuntu1904:~#ansible all -m command -a "echo 'Hello ansibleansible'"
172.20.1.79 | CHANGED | rc=0 >>
Hello ansibleansible

172.20.1.67 | CHANGED | rc=0 >>
Hello ansibleansible

172.20.1.68 | CHANGED | rc=0 >>
Hello ansibleansible

4.5.2 Shell 模块

• 功能: 和 command 功能类似，使用 shell 来在被控主机执行命令
• 注意点: 调用 bash 执行命令 类似 cat /tmp/test.md | awk -F‘|’ ‘{print $1,$2}’ &> /tmp/example.txt
  这些复杂命令，即使使用 shell 也可能会失败。解决办法：写到脚本–>copy 到远程主机–>执行；再把
  需要的结果 fetch 回来主控机器。
• 例子:

root@ubuntu1904:~#ansible all -m shell -a 'ip addr | sed -nr "s#.*(1
72.20.1...).*#\1#p"'
172.20.1.67 | CHANGED | rc=0 >>
172.20.1.67

172.20.1.68 | CHANGED | rc=0 >>
172.20.1.68

172.20.1.84 | CHANGED | rc=0 >>
172.20.1.84

4.5.3 Script 模块

• 功能: 在本地指定脚本，自动传输到远程执行并返回结果
• 注意点:
• 例子:

root@ubuntu1904:~#cat script.sh
#!/bin/bash
echo `ip a | sed -nr 's/inet (172.20.*\/..) .*/\1/p'`

root@ubuntu1904:~#ansible webwebsrvss -m script -a './script.sh'
172.20.1.67 | CHANGED => {
    "changed": true,
    "rc": 0,
    "stderr": "Shared connection to 172.20.1.67 closed.\r\n",
    "stderr_lines": [
        "Shared connection to 172.20.1.67 closed."
    ],
    "stdout": "172.20.1.67/16\r\n",
    "stdout_lines": [
        "172.20.1.67/16"   # 返回ip地址
    ]
}
172.20.1.68 | CHANGED => {
    "changed": true,
    "rc": 0,
    "stderr": "Shared connection to 172.20.1.68 closed.\r\n",
    "stderr_lines": [
        "Shared connection to 172.20.1.68 closed."
    ],
    "stdout": "172.20.1.68/16\r\n",
    "stdout_lines": [
        "172.20.1.68/16"
    ]
}
172.20.1.69 | CHANGED => {
    "changed": true,
    "rc": 0,
    "stderr": "Shared connection to 172.20.1.69 closed.\r\n",
    "stderr_lines": [
        "Shared connection to 172.20.1.69 closed."
    ],
    "stdout": "172.20.1.69/16\r\n",
    "stdout_lines": [
        "172.20.1.69/16"
    ]
}

4.5.4 Copy 模块

• 功能: 从 ansible 主控端复制文件到远程被控主机
• 注意点: 文件源在 ansible 主控机，目标是远程被控机
• 例子:

root@ubuntu1904:~#ansible all -m copy -a 'src=~/script.sh dest=/data/'
172.20.1.67 | CHANGED => {
    "changed": true,
    "checksum": "c3e89fbe08ae1d3edfa22b1c9968abd470ba8e81",
    "dest": "/data/script.sh",
    "gid": 0,
    "group": "root",
    "md5sum": "6a33896eae3ee660a6b0c0bb60a5b326",
    "mode": "0644",
    "owner": "root",
    "size": 67,
    "src": "/root/.ansible/tmp/ansible-tmp-1575851039.0323763-219776225171533/source",
    "state": "file",
    "uid": 0
}
......

# 将文本内容直接在被控机生成文件
root@ubuntu1904:~#ansible all -m copy -a 'content="Hello asible" dest=/data/hello.txt'
172.20.1.87 | CHANGED => {
    "changed": true,
    "checksum": "8754e6aac9f6b9b741c3bdf974e6a33bbc72b321",
    "dest": "/data/hello.txt",
    "gid": 0,
    "group": "root",
    "md5sum": "a131edb4211ac4a39aac74d8a04126f6",
    "mode": "0644",
    "owner": "root",
    "size": 12,
    "src": "/root/.ansible/tmp/ansible-tmp-1575851292.1085637-80128185007427/source",
    "state": "file",
    "uid": 0
}

root@ubuntu1904:~#ansible all -a  'cat /data/hello.txt'
172.20.1.89 | CHANGED | rc=0 >>
Hello asible

172.20.1.67 | CHANGED | rc=0 >>
Hello asible

172.20.1.68 | CHANGED | rc=0 >>
Hello asible

# 拷贝/etc/sysconfig/文件夹下的文件，不包括文件夹本身
root@ubuntu1904:~#ansible all -m copy -a 'src=/etc/sysconfig/ dest=/backup'

4.5.5 Fetch 模块

• 功能: 从远程被控主机拷贝文件到主控端，与 copy 模块方向相反
• 注意点: 不支持将远程被控机的问价夹拷贝到主控机
• 例子:

root@ubuntu1904:~#ansible all -m fetch -a  'src=/data/hello.txt dest=/data/'
172.20.1.87 | CHANGED => {
    "changed": true,
    "checksum": "8754e6aac9f6b9b741c3bdf974e6a33bbc72b321",
    "dest": "/data/172.20.1.87/data/hello.txt",
    "md5sum": "a131edb4211ac4a39aac74d8a04126f6",
    "remote_checksum": "8754e6aac9f6b9b741c3bdf974e6a33bbc72b321",
    "remote_md5sum": null
}
root@ubuntu1904:~#cat /data/172.20.1.67/data/hello.txt
Hello asible

4.5.6 File 模块

• 功能: 设置远程被控主机的文件、符号链接、文件夹的属性；也可以删除其
• 注意点: 创建软连接时，目标文件或文件夹是在远程被控主机上，软连接也是位于远程主机
• 例子:

# 创建文件
root@ubuntu1904:~#ansible all -m file -a 'path=/data/hello.txt state=touch'
# 删除文件
root@ubuntu1904:~#ansible all -m file -a 'path=/data/hello.txt state=absent'
# 修改文件属主和权限
root@ubuntu1904:~#ansible all -m file -a 'path=/data/hello.txt owner=steve mode=0700'
# 创建文件夹
root@ubuntu1904:~#ansible all -m file -a 'path=/data/dir state=directory mode=0700'
# 为远程主机某个文件创建文件夹
root@ubuntu1904:~#ansible all -m file -a 'src=/data/hello.txt dest=/data/hello-link state=link'

4.5.7 unarchive 模块

• 功能: 将打包压缩的文件解压缩
• 注意点: 参数 copy=yes 表示将 ansible 主控机的打包压缩文件传输到远程被控机再解压缩；copy=no 表示
  直接将远程主机某个压缩包解压缩。
• 常用参数：
  • copy：默认为 yes，当 copy=yes，拷贝的文件是从 ansible 主机复制到远程主机上，如果设置为
    copy=no，会在远程主机上寻找 src 源文件
  • remote_src：和 copy 功能一样且互斥，yes 表示在远程主机，不在 ansible 主机，no 表示文件在
    ansible 主机上；官方更推荐使用 remote_src 参数代替 copy 参数
  • src：源路径，可以是 ansible 主机上的路径，也可以是远程主机上的路径，如果是远程主机上的路
    径，则需要设置 copy=no
  • dest：远程主机上的目标路径
  • mode：设置解压缩后的文件权限
• 例子:

root@ubuntu1904:~#ansible all -m unarchive -a 'src=/data/bar.tar.gz dest=/var/lib/bar'
root@ubuntu1904:~#ansible all -m unarchive -a 'src=/data/bar.zip dest=/data copy=no mode=0700'
root@ubuntu1904:~#ansible all -m unarchive -a 'src=https://suosuoli.cn/god-of-editor.pdf.zip dest=/data'

4.5.8 Archive 模块

• 功能: 打包压缩，和 unarchive 方向相反。默认，该模块认为压缩的源文件在远程被控主机。
  压缩后指定remove=True可以删除源文件。
• 注意点:
• 例子:

root@ubuntu1904:~#ansible all -m archive  -a 'path=/data/ dest=/data/dir.tar.bz2 format=bz2 mode=0700'
172.20.1.87 | CHANGED => {
    "archived": [],
    "arcroot": "/data/",
    "changed": true,
    "dest": "/data/dir.tar.bz2",
    "expanded_exclude_paths": [],
    "expanded_paths": [
        "/data/"
    ],
    "gid": 0,
    "group": "root",
    "missing": [],
    "mode": "0700",
    "owner": "root",
    "size": 115,
    "state": "file",
    "uid": 0
}
......
root@ubuntu1904:~#ansible all -m fetch -a 'src=/data/dir.tar.bz2 dest=/data'
172.20.1.87 | CHANGED => {
    "changed": true,
    "checksum": "e74d1ab8aad31d62cacad3a65a2a0ccc5623871c",
    "dest": "/data/172.20.1.87/data/dir.tar.bz2",
    "md5sum": "706f8ee46597a3c62e6c4597f37739a5",
    "remote_checksum": "e74d1ab8aad31d62cacad3a65a2a0ccc5623871c",
    "remote_md5sum": null
}
......
oot@ubuntu1904:~#ll /data/172.20.1.87/data/
total 8
-rwx------ 1 root root 116 Dec  9 09:04 dir.tar.bz2
-rw-r--r-- 1 root root  12 Dec  9 08:35 hello.txt

4.5.9 Hostname 模块

• 功能: hostname 模块用来管理主机名
• 注意点:
• 例子:

root@ubuntu1904:~#ansible webwebsrvss -m hostname -a 'name=webhost'
172.20.1.69 | CHANGED => {
    "ansible_facts": {
        "ansible_domain": "",
        "ansible_fqdn": "webhost",
        "ansible_hostname": "webhost",
        "ansible_nodename": "webhost"
    },
    "changed": true,
    "name": "webhost"
}
172.20.1.67 | CHANGED => {
    "ansible_facts": {
        "ansible_domain": "",
        "ansible_fqdn": "webhost",
        "ansible_hostname": "webhost",
        "ansible_nodename": "webhost"
    },
    "changed": true,
    "name": "webhost"
}
172.20.1.68 | CHANGED => {
    "ansible_facts": {
        "ansible_domain": "",
        "ansible_fqdn": "webhost",
        "ansible_hostname": "webhost",
        "ansible_nodename": "webhost"
    },
    "changed": true,
    "name": "webhost"
}
root@ubuntu1904:~#ansible webwebsrvss  -a 'hostname'
172.20.1.68 | CHANGED | rc=0 >>
webhost

172.20.1.69 | CHANGED | rc=0 >>
webhost

172.20.1.67 | CHANGED | rc=0 >>
webhost

4.5.10 Cron 模块

• 功能: 管理和删除计划任务
• 注意点:
• 例子:

#备份数据库脚本
[root@centos8 ~]#cat mysql_backup.sh
mysqldump -A -F --single-transaction --master-data=2 -q -uroot |gzip >
/data/mysql_`date +%F_%T`.sql.gz
#创建任务
ansible 192.168.39.28 -m cron -a 'hour=2 minute=30 weekday=1-5 name="backup
mysql" job=/root/mysql_backup.sh'
ansible websrvs   -m cron -a "minute=*/5 job='/usr/sbin/ntpdate 172.20.0.1
&>/dev/null' name=Synctime"
#禁用计划任务
ansible websrvs   -m cron -a "minute=*/5 job='/usr/sbin/ntpdate 172.20.0.1
&>/dev/null' name=Synctime disabled=yes"
#启用计划任务
ansible websrvs   -m cron -a "minute=*/5 job='/usr/sbin/ntpdate 172.20.0.1
&>/dev/null' name=Synctime disabled=no"
#删除任务
ansible websrvs -m cron -a "name='backup mysql' state=absent"
ansible websrvs -m cron -a ‘state=absent name=Synctime’  

4.5.11 Yum 模块

• 功能: 使用 yum 安装、升级、降级、删除和列出软件包。
• 注意点: 该软件包只适用于 python2，如果需要 python3 的支持，使用 dnf 模块
• 例子:

# 安装
root@ubuntu1904:~#ansible webwebsrvss -m yum -a 'name=nginx state=present'
# 删除
root@ubuntu1904:~#ansible webwebsrvss -m yum -a 'name=nginx state=absent'

4.5.12 Service 模块

• 功能: 控制远程被控机的服务。支持 init 启动服务的系统(包括 BSD init，OpenRC，SysV，
  Solaris SMF,systemd，upstart)。
• 注意点:
• 例子:

root@ubuntu1904:~#ansible webwebsrvss -m service -a 'name=httpd state=started enabled=yes'
root@ubuntu1904:~#ansible webwebsrvss -m service -a 'name=httpd state=stopped'
root@ubuntu1904:~#ansible webwebsrvss -m service -a 'name=httpd state=reloaded'
root@ubuntu1904:~#ansible webwebsrvss -m service -a 'name=httpd state=restarted'

4.5.13 User 模块

• 功能: 管理用户账号和属性
• 注意点:
• 例子:

# 创建系统用户nginx
root@ubuntu1904:~#ansible webwebsrvss -m user -a 'name=nginx  groups="root,daemon" system=yes shell=/sbin/nologin createhome=no home=/data/nginx non_unique=yes'
172.20.1.67 | CHANGED => {
    "changed": true,
    "comment": "",
    "create_home": false,
    "group": 995,
    "groups": "root,daemon",
    "home": "/data/nginx",
    "name": "nginx",
    "shell": "/sbin/nologin",
    "state": "present",
    "system": true,
    "uid": 995
}
172.20.1.69 | CHANGED => {
    "changed": true,
    "comment": "",
    "create_home": false,
    "group": 992,
    "groups": "root,daemon",
    "home": "/data/nginx",
    "name": "nginx",
    "shell": "/sbin/nologin",
    "state": "present",
    "system": true,
    "uid": 994
}
172.20.1.68 | CHANGED => {
    "changed": true,
    "comment": "",
    "create_home": false,
    "group": 995,
    "groups": "root,daemon",
    "home": "/data/nginx",
    "name": "nginx",
    "shell": "/sbin/nologin",
    "state": "present",
    "system": true,
    "uid": 995
}
# 删除用户
root@ubuntu1904:~#ansible webwebsrvss -m user -a 'name=nginx state=absent remove=yes'
172.20.1.69 | CHANGED => {
    "changed": true,
    "force": false,
    "name": "nginx",
    "remove": true,
    "state": "absent",
    "stderr": "userdel: nginx mail spool (/var/spool/mail/nginx) not found\nuserdel: nginx home directory (/data/nginx) not found\n",
    "stderr_lines": [
        "userdel: nginx mail spool (/var/spool/mail/nginx) not found",
        "userdel: nginx home directory (/data/nginx) not found"
    ]
}
......

4.5.14 Group 模块

• 功能: 管理用户组
• 注意点:
• 例子:

# 创建组
root@ubuntu1904:~#ansible webwebsrvss -m group -a 'name=nginx gid=123 state=present system=yes'
172.20.1.69 | CHANGED => {
    "changed": true,
    "gid": 123,
    "name": "nginx",
    "state": "present",
    "system": true
}
172.20.1.67 | CHANGED => {
    "changed": true,
    "gid": 123,
    "name": "nginx",
    "state": "present",
    "system": true
}
172.20.1.68 | CHANGED => {
    "changed": true,
    "gid": 123,
    "name": "nginx",
    "state": "present",
    "system": true
}
root@ubuntu1904:~#ansible webwebsrvss -a 'getent group nginx'
172.20.1.69 | CHANGED | rc=0 >>
nginx:x:123:

172.20.1.68 | CHANGED | rc=0 >>
nginx:x:123:

172.20.1.67 | CHANGED | rc=0 >>
nginx:x:123:

# 删除组
root@ubuntu1904:~#ansible webwebsrvss -m group -a 'name=nginx state=absent'

4.5.15 Setup 模块

• 功能: setup 模块会手机远程被控主机的详细信息，其自带的记录远程主机的变量可以用于 playbook
• 注意点:
• 例子:

root@ubuntu1904:~#ansible webwebsrvss -m setup
172.20.1.67 | SUCCESS => {
    "ansible_facts": {
        "ansible_all_ipv4_addresses": [
            "172.20.1.67"
        ],
        "ansible_all_ipv6_addresses": [
            "fe80::4d59:6b61:25f9:d67d"
        ],
        "ansible_apparmor": {
            "status": "disabled"
        },
......
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_nodename"
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_hostname"
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_domain"
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_memtotal_mb"
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_memory_mb"
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_memfree_mb"
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_os_family"
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_distribution_major_version"
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_distribution_version"
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_processor_vcpus"
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_all_ipv4_addresses"
root@ubuntu1904:~#ansible websrvs -m setup -a "filter=ansible_architecture"

# 一些比较有用的参数
{{ ansible_default_ipv4.address }}
{{ansible_distribution}}
{{ansible_distribution_major_version}}
{{ansible_fqdn}}
{{ansible_hostname}}
{{ansible_machine}}
{{ansible_memtotal_mb}}
{{ansible_memory_mb.nocache.free}}
{{ansible_memory_mb.nocache.used}}
{{ansible_memory_mb.real.total}}
{{ansible_memory_mb.real.free}}
{{ansible_memory_mb.real.used}}
{{ansible_service_mgr}}
{{ansible_processor_cores}}
{{ansible_processor_count}}
{{ansible_processor_threads_per_core}}
{{ansible_pkg_mgr}}