[DO374] Ansible 配置文件

[1. 配置文件位置](#1. 配置文件位置)
[2. 配置文件](#2. 配置文件)
[3. Ansible 配置](#3. Ansible 配置)
[4. Ansible的Ad-hoc](#4. Ansible的Ad-hoc)
[5. Ansible 模块](#5. Ansible 模块)
[6. playbook段落](#6. playbook段落)
[7. 任务执行后续](#7. 任务执行后续)
[8. Ansible 变量](#8. Ansible 变量)
- [8.1 ansible 变量的定义](#8.1 ansible 变量的定义)
- - [8.1.1 主机变量](#8.1.1 主机变量)
  - [8.1.2 主机组变量](#8.1.2 主机组变量)
- [8.2 vars的循环](#8.2 vars的循环)
[9. Ansible Collection](#9. Ansible Collection)
[10. Ansible-galaxy 安装模块](#10. Ansible-galaxy 安装模块)
- [10.1 红帽和ansible的hub配置](#10.1 红帽和ansible的hub配置)
- [10.2 私有化hub配置](#10.2 私有化hub配置)
[11. 剧本执行顺序](#11. 剧本执行顺序)
[12. 判断](#12. 判断)
- [12.1 远程文件的判断](#12.1 远程文件的判断)
- [12.2 字符串大小写的判断](#12.2 字符串大小写的判断)
- [12.3 判断ansible版本(控制端)](#12.3 判断ansible版本(控制端))
- [12.4 子集](#12.4 子集)
- [12.5 父集(超集)](#12.5 父集(超集))
- [12.6 判断字符串是否在集合内](#12.6 判断字符串是否在集合内)
- [12.7 多任务用同一条件判断](#12.7 多任务用同一条件判断)
- - [12.7.1 block](#12.7.1 block)
  - [12.7.2 rescue](#12.7.2 rescue)
  - [12.7.3 always](#12.7.3 always)
  - [12.7.4 剧本退出](#12.7.4 剧本退出)
  - [12.7.5 带有条件的退出](#12.7.5 带有条件的退出)
[13. 循环语句](#13. 循环语句)
- [13.1 遍历列表](#13.1 遍历列表)
- [13.2 遍历字典](#13.2 遍历字典)
- [13.3 loop循环](#13.3 loop循环)
[14. 任务委派](#14. 任务委派)
[15. 事实委派](#15. 事实委派)
[16. 缓存事实变量](#16. 缓存事实变量)

1. 配置文件位置

默认位置(全局)/etc/ansible/ansible.cfg
当前工作目录./ansible.cfg
当前用户家目录下的~/.ansible.cfg
当前系统的ANSIBLE_CONFIG环境变量

优先级顺序: 4 > 2 > 3 > 1

2. 配置文件

配置块	含义
[defaults]	通用配置项,配置远程用户,连接密码,文件清单位置等
[inventory]	主机清单段落,配置清单使用的插件等
[privilege_escalation]	提权配置,是否提权,提权到哪个用户
[persistent_connection]	RHEL6 连接插件,现在默认ssh连接
[ssh_connection]	SSH连接配置项
[persistent_connection]	持久连接配置项,连接超时时间,命令超时时间
[accelerate]	加速项,默认端口:5099
[selinux]	selinux的配置项,用来配置ansible支持的文件系统驱动及lxc容器配置
[colors]	配置ansible的颜色,定义执行成功,错误输出的颜色
[diff]	打印任务执行前后的差异

3. Ansible 配置

如果使用普通用户进行sudo,客户端需要

bash 复制代码

# 1. add user
useradd qiu
# 2. Set a passwd to the qiu user
echo redhat | passwd --stdin qiu
# 3. Grant sudo privileges to the qiu user
vim /etc/sudoers.d/qiu        
qiu ALL=(ALL) NOPASSWD:ALL

ansible.cfg 配置

bash 复制代码

[defaults]
inventory=./inventory		# 清单文件
remote_user = root			# 远程用户
ask_pass      = false		# 连接是用  密码/秘钥
[privilege_escalation]
become=True					# 是否提权
become_method=sudo			# 是否 sudo
become_user=root			# 提权到 root 用户
become_ask_pass=False		# 提权是否需要 密码
[ssh_connection]
ssh_args = -C -o ControlMaster=auto -o ControlPersist=60s # ssh 连接加速

通过命令添加

bash 复制代码

# Set passwd file.
echo "Asimov" > .ansible_pass
chmod 600 .ansible_pass
# Test whether the password can be used for connection.
ansible all -m shell -a "whoami" -u root --vault-pass-file .ansible_pass
# Create qiu user.
ansible all -m shell -u root --vault-pass-file .ansible_pass -a "useradd qiu"
# Grant a password to the qiu user.
ansible all -m shell -u root --vault-pass-file .ansible_pass -a "echo 'root123' qiu"
# Grant sudo privileges to the qiu user.
ansible all -m shell -u root --vault-pass-file .ansible_pass -a "echo 'qiu ALL=(ALL)  NOPASSWD: ALL' > /etc/sudoers.d/qiu"
# Grant access key to the qiu user.
ansible all -m shell -u root --vault-pass-file .ansible_pass -a "mkdir /home/qiu/.ssh;echo 'ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDGtUW3ismHyuCW4CDdTVOOOq6aySdtYenXFWWx7HJa4VTepkG00aaLId9ocra10hc+MB0GTJMCyabDv3i8NKdi6GDH/aOLVsp/Ewy8DEzZMBlJDCt4v2i4/wU4liw6KgEFkZs+5hnqU8d4QzldyGJ5onr+AGvFOKG68CS0BBl40Z1twf1HhCyx8k6nzD2ovlkxWRFZKPAFrtPCBVvQDkOfVFZF+lwzaSztgAjbFZ4A9jqQyUYx4kOJ5DtRef36ucdUdVQale0+8lICl7/gb142SPpYfhxe88/BJScLPRjvVNeu1TxRmoHtVazqnAoRxQYAn2MoI6AG+w6QuZf8f7aL LabGradingKey' >> /home/qiu/.ssh/authorized_keys;chmod 600 /home/qiu/.ssh/authorized_keys; chown -R qiu:qiu /home/qiu/.ssh"
# Try to use the qiu remote user to connect with ansible.
# Modify ansible.cfg and change remote_user to qiu user.
ansible all -m ping

4. Ansible的Ad-hoc

ad-hoc: ansible 临时命令,用ansible的模块来完成自动化任务,每次只能使用1个模块,来完成一个任务.因此ad-hoc称为ansible的临时命令

ad-hoc的语法:

格式: ansible 选择的主机 -m [模块] -a "模块的参数" (ansible参数)

bash 复制代码

# example
ansible all -m shell -a "whoami" -u root -k

5. Ansible 模块

模块查询方式:

ansible-doc -l: 列出当前支持的所有模块

命令模块:

模块名	作用
shell	相当于在被控端本机上执行linux指令
command	相当于在被控端本机上执行linux指令,但有4个符号除外 \|,>,<,& 出现这4个符号时,command将无法执行该命令
script	将主控端的shell复制到远程并执行.
raw	不支持高阶参数(chdir,creates,removes)

chdir 执行命令前修改执行路径

creates 判断文件是否存在,如果存在就不执行后面的命令,文件不存在则执行后续命令

removes 和creates相反

当ansible省略模块时,默认使用command模块,取决于ansible.cfg配置文件中module_name = command参数.

文件模块

6. playbook段落

target段落:

hosts: 定义play在那些主机上运行

remote_user: 定义运行play的远程用户是哪个

gather_facts: 定义是否收集事实变量

注意: 在target中定义的参数可以是ansible.cfg中出现的,如果play中没有定义,则按ansible.cfg中的为准

vars段落: 用来定义变量,如果没有可以省略

支持在该段落中定义变量,也支持从文件中引入变量

直接定义变量:

变量名1: 值1

变量名2: 值2

tasks段落用来定义任务,可以省略

在playbook中默认存在一个facts的任务.可以通过target中的gather_facts: false关闭

yaml 复制代码

tasks:
    - name: 任务名称
      模块名称:
        具体参数: 参数的值

7. 任务执行后续

当需要执行完一个模块后有后续动作,可以用notify通知handlers.

当一个notify需要调用多个handler时,使用listen来关联监听.

yaml 复制代码

---
- name: test notify
  hosts: servera.lab.example.com
  gather_facts: false
  tasks:
  - name: touch file
    ansible.builtin.file:
      path: /etc/foo.conf
      state: touch  
    notify: show debug info
  handlers:
  - name: handler 1
    listen: show file
    ansible.builtin.debug:
      msg: "in 1"
  - name: handler 2
    listen: show file
    ansible.builtin.debug:
      msg: "in 2"
  - name: handler 3
    listen: show file
    ansible.builtin.debug:
      msg: "in 3"

8. Ansible 变量

8.1 ansible 变量的定义

yaml 复制代码

# inventory
servera ansible_port=2222 ansible_host=192.168.31.123 ansible_user=devlop
serverb ansible_port=4422 ansible_host=192.168.31.124 ansible_user=test

变量	含义
ansible_port	ssh端口
ansible_host	服务器ip
ansible_user	ssh用户
ansible_connection	ssh连接类型:local,ssh,paramikko,默认ssh
ansible_ssh_pass	ssh 密码
ansible_ssh_privite_key_file	ssh秘钥文件路径
ansible_ssh_executable	ssh命令路径

8.1.1 主机变量

对单个主机自定义变量

yaml 复制代码

[test]
serverd.lab.example.com app=apache
servere.lab.example.com app=vsftpd

8.1.2 主机组变量

对组进行定例变量

bash 复制代码

[test]
serverd.lab.example.com app=apache
servere.lab.example.com app=vsftpd
[test:vars]
zabbix_agent=yes
prometheus_agent=no

主机的vars优先级高于主机组中的vars

8.2 vars的循环

yaml 复制代码

---
- name: test notify
  hosts: servera.lab.example.com
  gather_facts: false
  vars:
    os_version:
      redhat:
        release: '7.9'
      ubuntu:
        release: '20.04'
      openeuler:
        release: '24.03LTS'
  tasks:
  - name: print versions
    debug:
      msg: "{{ item.value.release }}"
    loop: "{{ os_version | dict2items }}"

9. Ansible Collection

通过红帽自动化中心获取

https://console.redhat.com/ansible/automation-hub

通过ansible galaxy来获取

https://galaxy.ansible.com/ui/

通过yaml安装

yaml 复制代码

# collection.yml
collections:
	- name: url

执行命令进行安装

bash 复制代码

ansible-galaxy collection install -r collection.yml -p 安装的路径和位置

10. Ansible-galaxy 安装模块

10.1 红帽和ansible的hub配置

bash 复制代码

[defaults]
ask_pass=False
forks=5
inventory=./inventory
remote_user = devops
collections_path=/root/collections
[privilege_escalation]
become_method=sudo
become_user=root
become_ask_pass=False
become=true
[galaxy]
server_list=redhat_hub
[galaxy_server.redhat_hub]
url=https://console.redhat.com/api/automation-hub/content/published/
auth_url=https://sso.redhat.com/auth/realms/redhat-external/protocol/openid-connect/token
token=eyJhbGciOiJIUzUxMiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICI0NzQzYTkzMC03YmJiLTRkZGQtOTgzMS00ODcxNGRlZDc0YjUifQ.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.QdBlhVTGUj0Z0IsAkSRXM5yR2FfnY8k0Sczj5xVUjaKCiTJ-lCk08dUP2Omcndk6oQ0LYPXDzWL7v4f9423trg

测试安装ansible.posix

bash 复制代码

ansible-galaxy collection install ansible.posix

确认安装完成

bash 复制代码

[root@foundation0 ansible]# ls /root/collections/ansible_collections/ansible
posix

添加ansible仓库

bash 复制代码

[galaxy]
# 下行追加ansible_hub定义
server_list=redhat_hub,ansible_hub
[galaxy_server.redhat_hub]
url=https://console.redhat.com/api/automation-hub/content/published/
auth_url=https://sso.redhat.com/auth/realms/redhat-external/protocol/openid-connect/token
token=eyJhbGciOiJIUzUxMiIsInR5cCIgOiAiSldUIiwia2lkIiA6ICI0NzQzYTkzMC03YmJiLTRkZGQtOTgzMS00ODcxNGRlZDc0YjUifQ.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.QdBlhVTGUj0Z0IsAkSRXM5yR2FfnY8k0Sczj5xVUjaKCiTJ-lCk08dUP2Omcndk6oQ0LYPXDzWL7v4f9423trg
# 添加以下2行
[galaxy_server.ansible_hub]
url=galaxy.ansible.com

安装一个vmware.vmware的插件

bash 复制代码

ansible-galaxy collection install vmware.vmware

安装结束后可以看到在/root/collections/ansible_collections/创建了vmware的子目录,我们下载的新插件就安装在这个位置

10.2 私有化hub配置

复制仓库配置

bash 复制代码

[galaxy]
server_list = community_repo

[galaxy_server.community_repo]
url=https://hub.lab.example.com/api/galaxy/content/community/
token=<put your token here>

生成token

修改后的ansible.cfg文件内容

bash 复制代码

[defaults]
collections_path=/home/student/collection/plugin
[galaxy]
server_list = community_repo
[galaxy_server.community_repo]
url=https://hub.lab.example.com/api/galaxy/content/community/
token=9e266577135f4a42c8612d4bb06a9dcbdb394cdc

创建galaxy collection的路径

bash 复制代码

mkdir -p /home/student/collection/plugin

安装一个community库的试一下

复制以下命令在命令行执行

11. 剧本执行顺序

pre_tasks
pre_tasks中的handler
roles
tasks
roles中的handler
post_tasks
post_tasks中的handler
pre roles和tasks post

12. 判断

12.1 远程文件的判断

yaml 复制代码

---
- name: Is the file in servera
  hosts: servera.lab.example.com
  gather_facts: false
  tasks:
  - name: get file status
    file:
      name: /etc/hosts
      state: file
    register: get_file
  - name: get file
    debug:
      msg: "The file is exists"
    when: get_file.state == "file"

12.2 字符串大小写的判断

yaml 复制代码

---
- name: Is the file in servera
  hosts: servera.lab.example.com
  gather_facts: false
  vars:
    uppercase: REDHAT
    lowercase: redhat
  tasks:
  - name: Uppercase output
    debug:
      msg: "It's Uppercase!"
    when: uppercase is upper
  - name: Lowercase output
    debug:
      msg: "It's Lowercase!"
    when: lowercase is lower

12.3 判断ansible版本(控制端)

yaml 复制代码

---
- name: Is the file in servera
  hosts: servera.lab.example.com
  gather_facts: false
  tasks:
  - name: Operating Version
    debug:
      msg: "The playbook can run."
    when: ansible_version.full is version("2.8","gt")

12.4 子集

yaml 复制代码

---
- name: Is the file in servera
  hosts: servera.lab.example.com
  gather_facts: false
  vars:
    os_type:
      - rhel
      - fedora
      - centos
      - ubuntu
      - openeuler
    redhat:
      - rhel
      - fedora
      - centos
  tasks:
  - name: Subset
    debug:
      msg: "It's subset"
    when: redhat is subset(os_type)

12.5 父集(超集)

yaml 复制代码

---
- name: Is the file in servera
  hosts: servera.lab.example.com
  gather_facts: false
  vars:
    os_type:
      - rhel
      - fedora
      - centos
      - ubuntu
      - openeuler
    redhat:
      - rhel
      - fedora
      - centos

  tasks:
  - name: SuperSet
    debug:
      msg: "It's superset"
    when: os_type is superset(redhat)

12.6 判断字符串是否在集合内

yaml 复制代码

---
- name: Is the file in servera
  hosts: servera.lab.example.com
  gather_facts: false
  vars:
    os_type:
      - rhel
      - fedora
      - centos
      - ubuntu
      - openeuler
    redhat:
      - rhel
      - fedora
      - centos
    centos: centos
    
  tasks:
  - name: SuperSet
    debug:
      msg: "It's in superset"
    when: centos in redhat

12.7 多任务用同一条件判断

12.7.1 block

block: 将多个任务包含在一个区块内,进行判断.

yaml 复制代码

---
- name: block message test
  hosts: all
  gather_facts: true
  tasks:
    - name: in block
      block:
        - name: debug1
          debug:
            msg: "msg 1"
        - name: debug2
          debug:
            msg: "msg 2"
        - name: debug3
          debug:
            msg: "msg 3"
        - name: debug4
          debug:
            msg: "msg 4"
        - name: display hostname
          debug:
            var: ansible_hostname
      when: ansible_hostname == "servera"

这样就不需要在每个模块下面都加一个重复的

yaml 复制代码

when: ansible_hostname == "servera"

12.7.2 rescue

rescue是用来处理block失败的后续手段.

yaml 复制代码

---
- name: block message test
  hosts: all
  gather_facts: true
  tasks:
  - name: in block
    block:
    - name: get file
      file:
        name: /opt/rh374.txt
        state: file
    rescue:
    - name: touch file
      file:
        name: /opt/rh374.txt
        state: touch

当block内容执行错误后,rescue的修复任务被触发.如果block执行正常,那么rescue内容不会被执行.

当第二次再次执行,修复任务不在被执行

12.7.3 always

无论如何这个命令都会被执行

yaml 复制代码

---
- name: block message test
  hosts: all
  gather_facts: true
  tasks:
  - name: in block
    block:
    - name: get file
      file:
        name: /opt/rh374.txt
        state: file
    rescue:
    - name: touch file
      file:
        name: /opt/rh374.txt
        state: touch
    always:
    - name: show the filename rh374.txt
      file:
        name: /opt/rh374.txt
        state: file

12.7.4 剧本退出

yaml 复制代码

---
- name: block message test
  hosts: servera.lab.example.com
  gather_facts: true
  tasks:
  - name: get file
    file:
      name: /etc/hosts
      state: file
  - name: exit playbook
    fail:
      msg: "exit playbook"
  - name: output message
    debug:
      msg: "I am running"

当执行到fail段落时候就直接退出了,后续任务不会再被执行

判断ansible版本是否高于2.9,如果太低那么就不执行

bash 复制代码

---
- name: block message test
  hosts: servera.lab.example.com
  gather_facts: true
  tasks:
  - name: output message
    debug:
      msg: "{{ ansible_version.full }}"
  - name: optput ansible version
    fail:
      msg: "The ansible version is lower than 2.9,you must update the ansible version."
    when: ansible_version.full is version("2.9","lt")
  - name: install applications
    debug:
      msg: "install apps....."

12.7.5 带有条件的退出

当条件触发,则退出

yaml 复制代码

---
- name: block message test
  hosts: servera.lab.example.com
  gather_facts: true
  tasks:
  - name: Determine the ansible version,then install applications
    debug:
      msg: "Install apps....."
    failed_when: ansible_version.full is version("2.9","lt")

改为failed_when之后可以将2-3个task合并成一个

13. 循环语句

13.1 遍历列表

在ansible中有很多循环场景需要批量安装或者授权.

yaml 复制代码

---
- name: loop 
  hosts: servera.lab.example.com
  gather_facts: true
  vars:
    user_list:
    - tom
    - bob
    - andy
    - tony
    - ted
  tasks:
  - name: Add users
    user:
      name: "{{ item }}"
      state: present
    with_items: "{{ user_list }}"

13.2 遍历字典

yaml 复制代码

---
- name: loop 
  hosts: servera.lab.example.com
  gather_facts: true
  vars:
    user_list:
      ituser1:
        name: tom
        uid: 3000
        home: /home/tom
      ituser2:
        name: jarry
        uid: 3001
        home: /home/jarry
  tasks:
  - name: Add users
    #debug:
    #  msg:  "{{ item.value.name }} {{ item.value.uid }} {{ item.value.home }}"
      #msg:  "{{ item.value.name }}"
    user:
      name: "{{ item.value.name }}"
      uid: "{{ item.value.uid }}"
      comment: "{{ item.value.name }}"
      home: "{{ item.value.home }}"
    with_dict: "{{ user_list }}"

到servera上确认两个用户正常创建

13.3 loop循环

loop本身是循环列表,可以通过loop dict2items来循环字典.将字典转换成列表.

yaml 复制代码

---
- name: loop 
  hosts: servera.lab.example.com
  gather_facts: true
  vars:
    user_list:
      ituser1:
        name: tom
        uid: 3000
        home: /home/tom
      ituser2:
        name: jarry
        uid: 3001
        home: /home/jarry
  tasks:
  - name: Add users
    debug:
      msg:  "{{ item.value.name }} {{ item.value.uid }} {{ item.value.home }}"
    loop: "{{ user_list |dict2items }}"

14. 任务委派

delegate_to 可以将任务交给其他服务器执行,此服务器甚至可以不在inventory中

yaml 复制代码

---
- name: delegate to pluging
  hosts:  servera,serverb
  gather_facts: true
  tasks:
  - name: Delegate the playbook to serverc.
    block:
    - name: Install Apache
      yum:
        name: httpd
        state: present
    - name: Make sure a service unit is running
      ansible.builtin.systemd:
        state: started
        name: httpd
        enabled: yes
    - name: Make sure a service unit is stopping
      ansible.builtin.systemd:
        state: stopped
        name: firewalld
        enabled: yes
    - name: Create the index file
      copy:
        dest: /var/www/html/index.html
        content: "In serverc"
    delegate_to: serverc 
  - name: Download the file
    ansible.builtin.get_url:
      url: http://serverc/index.html
      dest: /root/aaa.html

将整个block中内容由servera和serverb调度给serverc,在serverc完成了调度后,servera和serverb再从serverc上获取到该文件

15. 事实委派

主要作用就是在服务器之间的参数传递

一般delegate_facts和delegate_to 会同时出现

yaml 复制代码

---
- name: Delegate facts
 hosts: servera,serverb
 gather_facts: no
 tasks:
 - name: get servera facts
   setup:
   delegate_facts: true
   delegate_to: serverb
 - name: set ip info
   copy:
     dest: /opt/ipaddress.txt
     content: "{{ hostvars['serverb'].ansible_eth0.ipv4.address }}"

16. 缓存事实变量

缓存事实变量目的: 为了加速playbook的执行加速,不必每次运行playbook都要进行实时变量的收集.

常见有3种缓存方式:

jsonfile
memcache
redis

开启缓存方式:

在ansible.cfg中[defaults]段落中gathering= 进行设置

参数	含义
smart	智能收集,如果本地有缓存则使用缓存,如果本地没有缓存则收集事实变量并缓存.
implicit	一直收集事实变量(默认)
explict	从来不收集,除非在playbook中指定gather_facts=true

smart开启后需要指定以下参数:

参数	值	含义
fact_caching=	jsonfile/memcached/redis三选一	以哪种格式缓存
fact_cacheing_connection	./facts_cache/	jsonfile需要指定事实变量缓存的位置
fact_caching_timeout	86400 (一天)	当缓存失效后,重新开始缓存

memcache配置参数:

参数	值	含义
fact_caching	memcached	使用memcache来做缓存
fact_caching_connection	127.0.0.1:11211	memcache的地址