• ansible


    Ansible:

        Configuration、Command and Control

        

        是什么 ? SSH-based configuration management, deployment, and task execution system

        

        运维工具的分类:

        agent:基于专用的agent程序完成管理功能,puppet, func, zabbix, ...需要有代理程序的工具

    降低了系统级账号和密码泄露的风险

        agentless:基于ssh或telnet服务完成管理,ansible, fabric, ...无需代理程序的工具

            

        架构:

            Ansible Core

            Modules:

                Core Modules

                Customed Modules自定义模块

            Host Iventory 主机清单,定义要管理的主机

                Files

                CMDB

            PlayBooks剧本,定义哪个主机扮演什么角色

                Hosts

                 roles时我们定义好的调用模块完成的任务功能

            Connection Plugins:连接插件

            

        特性:

            模块化:调用特定的模块,完成特定的任务;

            基于Python语言研发,由Paramiko, PyYAML和Jinja2三个核心库实现;

            部署简单:agentless;

            支持自定义模块,使用任意编程语言;

            强大的playbook机制;

            幂等性;

            

     

    Eg: 主机67

    Yum install ansible -y

    配置主机清单

    Vim /etc/ansible/hosts

    [websrvs]组名

    10.1.0.68 ansible_ssh_user=root ansible_ssh_pass=123.com

    10.1.0.69 ansible_ssh_user=root ansible_ssh_pass=123.com

    [dbsrvs]

    10.1.0.8 ansible_ssh_user=root ansible_ssh_pass=123.com

    10.1.0.68 ansible_ssh_user=root ansible_ssh_pass=123.com

     

    ssh免密钥登录

    1、在ansible server上生成公钥/私钥

    ssh-keygen -t rsa -P ''

    1. 写入信任文件

      将在ansible server生成的公钥/私钥分发到slave服务器

      scp /root/.ssh/id_rsa.pub 192.168.100.6:/root/.ssh/authorized_keys

      ..................................................

      在slave服务器上执行如下指令:(可选项,可以不做)

      cat /root/.ssh/id_rsa.pub >> /root/.ssh/authorized_keys

      Chmod 600 /root/.ssh/authorized_keys

      当ssh免秘钥登录设置完成后,就可以在主机清单中的各主机ip或域名后面无需跟用

      户名和密码了;

       

      Ansible-doc -l 可以获取到可以使用的管理模块

      Ansible websrvs -m ping 来探测连接的主机是否ok

      Ansible all -m ping 所有主机是否都在线

       

          安装及程序环境:

              程序:

                  ansible

                  ansible-playbook

                  ansible-doc

              配置文件:

                  /etc/ansible/ansible.cfg

              主机清单:

                  /etc/ansible/hosts

              插件目录:

                  /usr/share/ansible_plugins/

                  

          基本使用入门:        

              ansible命令:

                  Usage: ansible <host-pattern> [options]

               此处的hsot-pattern一定是在/etc/ansible/hosts下定义的主机

                  常用选项:

                      -m MOD_NAME -a MOD_ARGS

                       -m 指明模块名称

      -a 指明模块参数

      调用哪个模块,传递什么参数,来完成什么样的任务。

              配置Host Inventory:

                  /etc/ansible/hosts

                  [group_id]

                  HOST_PATTERN1

                  HOST_PATTERN2

                  

              模块:

                  获取模块列表:ansible-doc -l

                  获取指定模块的使用帮助:ansible-doc -s MOD_NAME

                  

      常用模块:

      ping:探测目标主机是否存活;

                  

      command:在远程主机执行命令;

                  Ansible all -m command -a "ifconfig"    

      Eg: ansible all -m command -a "useradd centos"

      Ansible all -m command -a "echo '123.com' | passwd --stdin centos"该命令执行有问题

      shell:在远程主机上调用shell解释器运行命令,支持shell的各种功能,例如管道等 ;

                   Ansibele all -m shell -a "echo '123.com' | passwd --stdin centos"

                  注意:command和shell模块的核心参数直接为命令本身;而其它模块的参数通常为"key=value"格式;

                  

      copy: C o p i e s f i l e s t o r e m o t e l o c a t i o n s .

      复制文件到远程主机

                      用法:

                          (1) 复制文件

                              -a "src=源 dest=目标 "

      Ansible all -m copy -a "src=/etc/fstab dest=/tmp/fstab.ansible mode=640(指明授权)"

       

                          (2) 给定内容生成文件

                              -a "content= dest= "

                      Ansible all -m copy -a "content='hello word' dest=/tmp/test.ansible mode=640"

       

                          其它参数:mode(权限), owner(属主), group(属组), ...

                          

      file:Sets attributes of files 设置文件属性

      Ansible all -m file -a "path=/tmp/fstab.ansible owner(修改属主)=centos"

      state定义文件目标状态

                      用法:

                          (1) 创建目录:

                              -a "path= state=directory"

      Ansible all -m file -a "path=/tmp/dir.ansible state=directory"

                          (2) 创建链接文件:

                              -a "path= src= state=link"

      Ansible all -m file -a "path=/tmp/test.ansible.link src=/tmp/test.ansable state=link"

                          (3) 删除文件:

                              -a "path= state=absent"

      Ansible all -m file -a "path=/tmp/fstab.ansible state=absent(缺席)"

       

      fetch: fetches a file from remote nodes

                   从远程主机拉取文件到本地

      Eg:ansible 192.168.100.5 -m fetch -a "src=/testdir/1.txt dest=/testdir"

      cron:Manage cron.d and crontab entries.

      管理crontab中的周期任务的

                       -a " "

                          minute=

                          hour=

                          day=

                          month=

                          weekday=

                          job=真正要执行的命令

                          name=

                          user=为哪个用户来创建crontab

      Eg:ansible all -m cron -a "minute='*/5' job='/usr/sbin/ntpdate 10.1.0.1 & > /dev/null' name='sync time' " 每隔5分钟执行一次时间同步,无论成功失败,返回的结果都去/dev/null。这次任务的名称叫sync time;

      去客户机执行crontab -l查看计划任务

      若删除此计划任务:

      Ansible all -m cron -a "name='sync time' state=absent"             

                          state={present(创建)|absent}

                          

      hostname:Manage hostname设置主机名

                       name=

                      

      yum: Manages packages with the i(yum) package manager

                      -a ""

       

              (1) name= state={present|latest}

      state=install(prestent、 latest) remove(absent)

                          (2) name= state=absent

      Eg:ansible all -m yum -a "name=httpd state=present"

      Et: ansible all -m yum -a "name=httpd state=absent"

       

      service:M a n a g e s e r v i c e s .控制守护进程的启动停止

                      -a ""

                          name=包名

                          state=

                               started

                               stopped

                               restarted

                          enabled=表示是否开机自动启动

                          runlevel=在哪些级别下开机自启动

      Eg:ansible all -m service -a "name=httpd state=started enabled=true"

                  

      group: A d d o r r e m o v e g r o u p s用来添加或删除组

                      -a ""

                          name=

                          state=

                          system=

                          gid=

                          

      user:M a n a g e u s e r a c c o u n t s

                      -a ""

                          name=

                          group=基本组

                          groups=附加组

                          comment=注释信息

                          uid=

                          system=

                          shell=默认shell

                          expires=过期时间

                          Home=指定家目录

                          

      setup:G a t h e r s f a c t s a b o u t r e m o t e h o s t s

                   用于收集远程主机的facts

      Facts:用于实现在每一个主机上收集当前主机的各种属性信息的集合。

      Eg:ansible 10.1.0.68 -m setup    

                

      YAML:

      Yum info PyYAML

                  YAML is a data serialization format designed for human readability and interaction with scripting languages.YAML是一种数据序列化格式为人类可读性和交互设计与脚本语言

                  

                  数据结构:

                      Key : value键值对

                      列表:

                       - item1

                       - item2

                       - item3

                      

                      字典:{name:jerry, age:21}

                      

              PlayBook:剧本

                  核心元素:

                      Tasks:任务,由模块定义的操作的列表;

                      Variables:变量

                      Templates:模板,即使用了模板语法的文本文件;

                      Handlers:由特定条件触发的Tasks;

                      Roles:角色;

                      

                      playbook的基础组件:

                          Hosts:运行指定任务的目标主机;

                          remote_user:在远程主机以哪个用户身份执行;

                              sudo_user:非管理员需要拥有sudo权限;

                          tasks:任务列表

                              模块,模块参数:

                                  格式:

                                      (1) action: module arguments

                                      (2) module: arguments

                                      

                      示例1:

      Vim group.yaml

                      

              

                  运行playbook,使用ansible-playbook命令

                      (1) 检测语法

                          ansible-playbook /path/to/playbook.yaml 运行playbook.yaml

      -C或--syntax-check 语法检查

      Eg:ansible-playbook --check group.yaml

                      (2) 测试运行:

                          ansible-playbook -C /path/to/playbook.yaml

                              --list-hosts某些任务只影响哪些主机

                              --list-tasks 列出要执行的任务

                              --list-tags tags标签

                      (3) 运行

                          ansible-playbook /path/to/playbook.yaml

                              -t TAGS, --tags=TAGS只运行这里tags所标记的任务

                              --skip-tags=SKIP_TAGS跳过指定的标签所标记的任务

                              --start-at-task=START_AT从某个任务开始向后运行

                      Eg:ansible-playbook --check --list-hosts group.yaml    

               Ansible-playbook --check --list-hosts --list-tasks group.yaml 还能显示所执行的任务

       

       

       

      Ansible websrvs -m yum -a "name=httpd state=absent"

      在服务端安装httpd,只是为了生成httpd.conf文件作为模板文件

      修改监听的端口为8080

      条件:

      远程主机安装程序包

      提供配置文件

      启动服务

      Vim web.yaml

      - hosts: websrvs

                       remote_user: root

                       tasks:

                       - name: install httpd package

                       yum: name=httpd state=latest

                       - name: install conf file

                       copy: src=/root/httpd.conf dest=/etc/httpd/conf/httpd.conf

                       - name: start httpd service

                       service: name=httpd state=started

              Ansible-playbook --syntax-check web.yaml        

      Ansible-playbook --check web.yaml

      Ansible-playbook web.yaml

      在客户端检测8080端口是否启动

       

      再次把端口改为80.启动playbook,80端口不会被启动

       

                  handlers:由特定条件触发的Tasks;

                      调用及定义方式:

                      tasks:

                      - name: TASK_NAME

                       module: arguments

                       notify: HANDLER_NAME 表示通知

                      handlers:

                      - name: HANDLER_NAME

                       module: arguments

                      

                      示例:

                      - hosts: websrvs

                       remote_user: root

                       tasks:

                       - name: install httpd package

                       yum: name=httpd state=latest

                       - name: install conf file

                       copy: src=/root/httpd.conf dest=/etc/httpd/conf/httpd.conf

                       notify: restart httpd service 在handlers中定义的名称跟notify中定义的名称一致,表示通知触发参数,所以其配置文件不改,restart就不会被触发。

                       - name: start httpd service

                       service: name=httpd state=started

                       handlers:处理器

                       - name: restart httpd service

                       service: name=httpd state=restarted        

      注意:notify和handlers的name要保持一致;其copy的源文件不发生改变,handlers也不会被触发生效;

              

                      

      再次启动服务,80端口启动

       

       

      注意:若是nginx的配置文件发生修改,则不需要重启,一重启,就会发生问题,一重启意味着有些服务就会出问题。

      将state定义为reload

      。。。。。。。。。。。。。。。。。。。。。。。。。。

      notify: reload nginx service

      。。。。。。。。。。。。。。。。。。。。。。。。

      handlers:

                       - name: reload nginx service

                       Shell: nginx -s reload(此处最好写全路径,可以用which命令查)

       

       

                  tags:给指定的任务定义一个调用标识;只调用打了标签的任务

      多个任务可以使用同一个tag,也可以在一次任务中指定多个tag。

                      - name: NAME

                       module: arguments

                       tags: TAG_ID

       

                       Eg:

      Vim web.yaml

      - hosts: websrvs

                       remote_user: root

                       tasks:

                       - name: install httpd package

                       yum: name=httpd state=latest

                       - name: install conf file

                       copy: src=/root/httpd.conf dest=/etc/httpd/conf/httpd.conf

      tags:instconf

                       - name: start httpd service

                       service: name=httpd state=started

       

      Ansible-playbook --check -t instconf web.yaml

      Ansible-playbook --check -t instconf --list-tags web.yaml 显示你的标签

      Ansible-playbook -t instconf web.yaml

       

       

       

                  Variables:变量

                      类型:

                          内建:可直接调用

                              (1) facts

                          自定义:

                              (1) 命令行传递;

                                  -e VAR=VALUE

      Eg:
      vim pkg.yaml

      - hosts:websrvs

      remote_user:root

      tasks:

      - name:install a package

      yum:name={{ pkgname }} state=present

      Ansible-playbook --syntax-check pkg.yaml

      Ansible-playbook --check -e pkgname=ftp pkg.yaml

      Ansible-playbook --check -e pkgname=vsftpd pkg.yaml

       

                              (2) 在hosts Inventory中为每个主机定义专用变量值;

                                  (a) 向不同的主机传递不同的变量 ;

                                      IP/HOSTNAME variable_name=value

       

      Vim hosts

      [websrvs]

      10.1.0.68 pkgname=nginx

      10.1.0.69 pkgname=httpd

      传递给主机的单独的变量

                  Ansible-playbook --check pkg.yaml

       

       

       

                                  (b) 向组内的所有主机传递相同的变量 ;

                                      [groupname:vars]

                                      variable_name=value

      Vim hosts

      [websrvs]

      10.1.0.68

      10.1.0.69

      [websrvs:vars]

      Pkgname=memcached

      在websrvs组内有一组变量,其中有一个变量是Pkgname=memcached

      意味着websrvs组中的成员都可以使用pkgname这个便量名

       

       

       

       

                              (3) 在playbook中定义

                                  vars:

                                  - var_name: value

                                  - var_name: value

       

      vim pkg.yaml

      - hosts:websrvs

      remote_user:root

      vars:

      - pkgname:memcached

      - pkgname:vsftpd

      tasks:

      - name:install a package

      yum:name={{ pkgname }} state=present

      Ansible-playbook --check pkg.yaml

      Ansible-playbook --check pkgname=vsftpd pkg.yaml

       

       

                      

                              (4) Inventory还可以使用参数:

                                  用于定义ansible远程连接目标主机时使用的属性,而非传递给playbook的变量;较危险不常用。

      使用该功能时要安装:yum install sshpass -y

                                      ansible_ssh_host

                                      ansible_ssh_port

                                      ansible_ssh_user连接此主机使用的用户名

                                      ansible_ssh_pass连接此主机使用的密码

                                      ansible_sudo_pass

                                      ...

                                      [websrvs]

      10.1.0.68 ansible_ssh_user=root ansible_ssh_pass=123.com

      10.1.0.69

                              (5) 在角色调用时传递

                                  roles:

                                  - { role: ROLE_NAME, var: value, ...}

                      

                      变量调用:

                          {{ var_name }}

                

       

       

       

                  Templates:模板

                      文本文件,内部嵌套有模板语言脚本(使用模板语言编写)

                  Yum info python-jinja2

                      Jinja2 is a template engine written in pure Python. It provides a Django inspired non-XML syntax but supports inline expressions and an optional sandboxed environment.

                      

                      语法:

                          字面量:

                              字符串:使用单引号或双引号;

                              数字:整数、浮点数;

                              列表:[item1, item2, ...]

                              元组:(item1, item2, ...)

                              字典:{key1:value1, key2:value2, ...}

                              布尔型:true/false

                              

                          算术运算:

                              +, -, *, /, //, %, **

                              

                          比较操作:

                              ==, !=, >, <, >=, <=

                              

                          逻辑运算:and, or, not

                          

                      执行模板文件中的脚本,并生成结果数据流,需要使用template模块;

      Ansible-doc -s template

                          template:

                              -a ""

                                  src=

                                  dest=

                                  mode=

                                  onwer=

                                  group=

                                  

                          注意:此模板不能在命令行使用,而只能用于playbook;

                      

                          示例:假如每个主机所使用的nginx所使用的配置文件对应的值是其虚拟的cpu

      个数

      Ansible websrvs -m steup | grep vcpus

       

      该play-book能够基于模板复制配置文件

      在服务端安装nginx,主要使用其配置文件

      Vim /etc/nginx/nginx.conf

      Worker_press {{ ansible_processor_vcpus}};

       

      Ansible websrvs -m copy -a "src=/root/nginx.conf dest=/tmp/nginx.conf"

      此时查看客户机中的nginx.conf,copy命令将nginx.conf中的{{ ansible_processor_vcpus}}

      当成了普通字符串。

      所以在基于模板方式定义时,要将其解析为一个结果放在配置文件中。

      Vim test.yaml

      - hosts: websrvs

      Remote_user: root

      Tasks:

      - name: generate conf file

      Template: src=/root/nginx.conf.j2 dest=/tmp/nginx.conf

       

      Ansible-playbook --check test.yaml

      Ansible-playbook test.yaml

      在客户机上验证:less /tmp/nginx.conf

       

      Vim nginx.yaml

                       - hosts: ngxsrvs

                              remote_user: root

                              tasks:

      - name: download nginx package

      Shell: "wget -o /tmp/ http://nginx.org/"

                              - name: install nginx package

                              yum: name=nginx state=latest

                              - name: install conf file

                              template: src=/root/nginx.conf.j2 dest=/etc/nginx/nginx.conf

                              tags: ngxconf

                              notify: reload nginx service

                              - name: start nginx service

                              service: name=nginx state=started enabled=true

                              handlers:

                              - name: reload nginx service

                              shell: /usr/sbin/nginx -s reload或service: name=nginx state=restarted

                              

       

                  条件测试:

                      when语句:在tasks中使用,Jinja2的语法格式;

                      

      - hosts: all

      remote_user: root

      tasks:

      - name: install nginx package

      yum: name=nginx state=latest

      - name: start nginx service on CentOS6

      shell: service nginx start

                  when: ansible_distribution == "CentOS" and ansible_distribution_major_version == "6"

      - name: start nginx service

                  shell: systemctl start nginx.service

                  when: ansible_distribution == "CentOS" and ansible_distribution_major_version == "7"

                          

      实验环境:

      给两台客户机分别安装CentOS6和CentOS7

                  循环:迭代,需要重复执行的任务;

                      对迭代项的引用,固定变量名为"item",使用with_item属性给定要迭代的元素;

                          元素:列表

                              字符串

                              字典

                          

                      基于字符串列表给出元素示例:

      Vim websrvs.yaml

                           -    hosts: websrvs

                              remote_user: root

                              tasks:

                              - name: install packages

                               yum: name={{ item(只能使用item) }} state=latest

                               with_items:

                               - httpd

                               - php

                               - php-mysql

                               - php-mbstring

                               - php-gd

                              

                      基于字典列表给元素示例:创建3个用户,三个用户分别属于不同的组

                           -     hosts: all

                              remote_user: root

                              tasks:

                              - name: create groups

                              group: name={{ item }} state=present

                              with_items:

                              - groupx1

                               - groupx2

                              - groupx3

                              - name: create users

                              

      user: name={{ item.name }} group={{ item.group }} state=present

                              with_items:

                              - {name: 'userx1', group: 'groupx1'}

                              - {name: 'userx2', group: 'groupx2'}

                              - {name: 'userx3', group: 'groupx3'}                    

                      

       

      角色:roles

      以特定的层级目录结构进行组织的tasks、variables、handlers、templates、files等;

      role_name/

      files/:存储由copy或script等模块调用的文件;

                  tasks/:此目录中至少应该有一个名为main.yml的文件,用于定义各task;其它的文件

      需要由main.yml进行"包含"调用;

                  handlers/:此目录中至少应该有一个名为main.yml的文件,用于定义各handler;其它

      的文件需要由main.yml进行"包含"调用;

                  vars/:此目录中至少应该有一个名为main.yml的文件,用于定义各variable;其它的文

      件需要由main.yml进行"包含"调用;

                  templates/:存储由template模块调用的模板文本;

                  meta/:此目录中至少应该有一个名为main.yml的文件,定义当前角色的特殊设定及其

      依赖关系;其它的文件需要由main.yml进行"包含"调用;

                  default/:此目录中至少应该有一个名为main.yml的文件,用于设定默认变量;

      Eg:

      Cd /etc/ansible/roles/     Mkdir ./{nginx,memcached,httpd,mysql}/{files,templates,vars,handlers,meta,default,tasks} -pv

      Vim nginx/tesks/main.yml (将下载的nginx包放在该目录)

      - name: copy nginx package to remote host

      Copy:src=nginx-1.10.0-1.el7.ngx.x86_64.rpm

      dest=/tmp/nginx-1.10.0-1.el7.ngx.x86_64.rpm

      - name: install nginx package

      Yum: name=/tmp/nginx-1.10.0-1.el7.ngx.x86_64.rpm state=present

      - name: install conf file nginx.conf

      Template: src=nginx.conf.j2 dest=/etc/nginx/nginx.conf(不用写全路径,只要将文件放入template目录中,系统自己会去找,所以只需要去写文件名)

      Tags:ngxconf

      Notify: reload nginx service

      - name: install conf file default.conf

      Template: src=default.conf.j2 dest=/etc/nginx/conf.d/default.conf

      Tags: ngxconf

      Notify: reload nginx service

      - name: art nginx service

      Service: name=nginx enabled=true state=started

      ##################################################################

      Vim nginx/handlers/main.yml

      - name: reload nginx service

      Service: name=nginx state=restarted

      ########################################################

      Vim nginx/templates/nginx.conf.j2

      ......................................................................

      Worker_proesses {{ ansible_processor_vcpus }};

      .......................................................................

      ##########################################################################

      Cp /etc/nginx/conf.d/default.conf templates/default.conf.j2

      Vim default.conf.f2

      ......................................................

      Server {

      Listen {{ ngxport }};

      ....................................................

      }

      ############################################################################

      Vim vars/main.yml 定义变量

      ngxport: "8090"

      调用方式:

      Vim nginx.yml

      - hosts: ngxsrvs

      Remote_user: root

      Roles:

      - nginx(该名称要跟roles目录下的名称一致)

       

      或当我们想让服务监听到其他端口,而又不需要让所有服务都跑一遍,

      就可以用定义变量的方式来修改监听端口。

      Vim nginx.yml

      - hosts: ngxsrvs

      Remote_user: root

      Roles:

      - { role: nginx, ngxport: 8080 }

       

      Ansible-playbook --check --list-tags nginx.yml

      Ansible-playbook --check -t ngxconf nginx.yml

      Ansible-playbook -t ngxconf nginx.yml

       

      Vim ansible.cfg

      Roles_path = /etc/ansible/roles 取消注释

       

      Ansible-playbook --syntax-check nginx.yml

      Ansible-playbook --check nginx.yml (该处报错install nginx package,正常,

      因为是测试,第一步没有真正把文件复制过去)

      ######################################################################

       

      Vim ansible.cfg

      ............................

      Forks = 5 默认一次只影响5个主机,例如当有100个主机时,ansible

      一次只处理5个,如果机器性能还行,可以调大一点。

       

      ###########################################################

      ##############################################################################

      Yum install memcached

      Vim roles/memcached/tasks/main.yml

      - name: install memcached

      Yum : name=memcached state=latest

      - name: install conf file

      Template: src=memcached.j2 dest=/etc/sysconfig/memcached

      Tags: mcconf

      Notify: reload memcached

      - name: start memcached service

      Service: name=memcached state=started enabled=true

      Cp /etc/sysconfig/memcached roles/memcached/templates/memecached.j2

      Vim memcached.j2

      ........................................................

      CACHESIZE="{{ ansible_memtotal_mb // 4 }}"

      ..................................................

      ################################################################################

      Vim roles/memcached/handlers/main.yml

      - name: reload memcached

      Service: name=memcached state=restarted

      ###############################################

      Vim nginx.yml

      - hosts: ngxsrvs

      Remote_user: root

      Roles:

      - nginx

      - memcached

       

      Ansible-playbook --check nginx.yml

       

      在客户机上进行测试:

      Ss -ntl 11211

      Cat /etc/sysconfig/memcached

      ######################################################################################################################################################################################################################################################

      Mysql 演示

      Vim /roles/mysql/tasks/main.yml

      - name: install myaql-server

      Yum: name=myaql-server state=latest

      When: ansible_distribution == "CentOS" and ansible_distribution_major_version == "6"

      - name: install mariadb-server

      Yum: name=mariadb-server state=latest

      When: ansible_distribution == "CentOS" and ansible_distribution_major_version == "7"

      - name: start myaql service

      Service: name=mysqld state=started

      When: ansible_distribution == "CentOS" and ansible_distribution_major_version == "6"

      - name: start mariadb service

      Service: name=mariadb state=started

      When: ansible_distribution == "CentOS" and ansible_distribution_major_version == "7"

       

      Vim db.yaml

      - hosts: dbsrvs

      Remote_user: root

      Roles:

      - myaql

       

      Ansible-playbook --check db.yaml

      在客户机上分别测试 ss -ntl

       

       

                  在playbook中调用角色的方法:

                      - hosts: HOSTS

                       remote_user: USERNAME

                       roles:

                       - ROLE1

                       - ROLE2

                       - { role: ROLE3, VARIABLE: VALUE, ...}

                       - { role: ROLE4, when: CONDITION }

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  • 原文地址:https://www.cnblogs.com/zhangzhide/p/12640359.html
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