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            <p>
              Shell编程四剑客之Find通过如上基础语法的学习，读者对Shell编程有了更近一步的理解，Shell编程不在是简单命令的堆积，而是演变成了各种特殊的语句、各种语法、编程工具、各种命令的集合。
在Shell编程工具中，四剑客工具的使用更加的广泛，Shell编程四剑客包括：find、sed、grep
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                <a href="/blog/title.html" class="post-title-link" itemprop="url">在阿里云Centos7.6上面配置Mysql主从数据库(master/slave)，实现读写分离</a>


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            <p>
              MySQL的主从复制，实现读写分离
在阿里云配置端口规则：3306

测试MySQL服务


主从同步

首先准备两台阿里云服务器，一台作为主机（master），一台作为从机（slave），都安装好mysql5.7

进入master服务器

修改配置mysql配置文件 vim /etc/my.c
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            <p>
              ansible-playbook
在之前的ansible使用中，我们都是通过命令行的形式实现对应远程主机的响应管理
但这样的工作方式功能上来说还是有一定的局限性，并且维护并不方便，引入playbook可以更加方便我们对于功能的编写维护，并且具有良好的灵活性
playbook也可以理解为命令行功能的一
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            <p>
              ansible 基于Python开发，集合了众多运维工具（puppet、cfengine、chef、func、fabric）的优点，实现了批量系统配置、批量程序部署、批量运行命令等功能
在使用时，ansible不需要在被控端安装客户端，ansible工作基于ssh，只要被控端服务器有ssh服务，加上
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              什么是事务？
事务是由一步或几步数据库操作序列组成逻辑执行单元，这系列操作要么全部执行，要么全部放弃执行。程序和事务是两个不同的概念。一般而言：一段程序中可能包含多个事务。（说白了就是几步的数据库操作而构成的逻辑执行单元）
事务具有四个特性：原子性（Atomicity）、一致性（Consistenc
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            <p>
              linux常用命令
cd 目录切换

cd .. 上级目录

cd ~ 家目录home

cd /根目录

pwd 显示当前的所属目录

ls 浏览目录下的文件或文件夹


ls -a 列举所有的目录和文件包含隐藏文件

ls -l 详细信息文件和目录

ls -i 列出每个文件Inode号
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            <p>

安装MySQL

在命令行工具输入：
wget ‘https://dev.mysql.com/get/mysql57-community-release-el7-11.noarch.rpm&#39;
rpm -Uvh mysql57-community-release-el7-11.noarch.
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              str1、capitalize:首字符首字母大写，其他字符字母小写&gt;&gt;&gt; a='chinese'&gt;&gt;&gt; a.capitalize()'Chinese'

2、casefold：所有字符字母转小写&gt;&gt;&gt; a='Chinese'&gt;&gt;&gt
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              RTMP协议是Real Time Message Protocol(实时信息传输协议)的缩写它是由Adobe公司提出的一种应用层的协议，用来解决多媒体数据传输流的多路复用和分包问题随着VR技术的发展，视频直播等领域逐渐活跃起来，RTMP作为业内广泛使用的协议也重新被相关开发者重视起来。
1、总体介绍
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              python模块之PIL模块（生成随机验证码图片）PIL简介PIL：是Python Image Library的缩写，图像处理的模块。主要的类包括Image,ImageFont,ImageDraw,ImageFilterPIL的导入首先需要安装一下pillow包pip install pillow

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                    item: resultItem,
                    searchTextCount: searchTextCount,
                    hitCount: hitCount,
                    id: resultItems.length
                  });
                }
              })
            };
            if (keywords.length === 1 && keywords[0] === "") {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-search fa-5x"></i></div>'
            } else if (resultItems.length === 0) {
              resultContent.innerHTML = '<div id="no-result"><i class="fa fa-frown-o fa-5x"></i></div>'
            } else {
              resultItems.sort(function (resultLeft, resultRight) {
                if (resultLeft.searchTextCount !== resultRight.searchTextCount) {
                  return resultRight.searchTextCount - resultLeft.searchTextCount;
                } else if (resultLeft.hitCount !== resultRight.hitCount) {
                  return resultRight.hitCount - resultLeft.hitCount;
                } else {
                  return resultRight.id - resultLeft.id;
                }
              });
              var searchResultList = '<ul class=\"search-result-list\">';
              resultItems.forEach(function (result) {
                searchResultList += result.item;
              })
              searchResultList += "</ul>";
              resultContent.innerHTML = searchResultList;
            }
          }

          if ('auto' === 'auto') {
            input.addEventListener('input', inputEventFunction);
          } else {
            $('.search-icon').click(inputEventFunction);
            input.addEventListener('keypress', function (event) {
              if (event.keyCode === 13) {
                inputEventFunction();
              }
            });
          }

          // remove loading animation
          $(".local-search-pop-overlay").remove();
          $('body').css('overflow', '');

          proceedsearch();
        }
      });
    }

    // handle and trigger popup window;
    $('.popup-trigger').click(function(e) {
      e.stopPropagation();
      if (isfetched === false) {
        searchFunc(path, 'local-search-input', 'local-search-result');
      } else {
        proceedsearch();
      };
    });

    $('.popup-btn-close').click(onPopupClose);
    $('.popup').click(function(e){
      e.stopPropagation();
    });
    $(document).on('keyup', function (event) {
      var shouldDismissSearchPopup = event.which === 27 &&
        $('.search-popup').is(':visible');
      if (shouldDismissSearchPopup) {
        onPopupClose();
      }
    });
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