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在http请求的页面如果有type=password的input框，Firefox的控制台有如下提示： Password fields present on an insecure (http://) page. This is a security risk that allows user login credentials to be stolen.
为了解决这个问题，要使用https请求。用到了google code下的struts的ssl插件 struts2-ssl-plu ...
1、使用场景
定期修改可提高安全性
2、使用方式
打开配置文件：vi /etc/ssh/sshd_config 修改端口号：找到 #Port 22，去掉注释，修改成目标端口 保存文件：wq! 重启ssh管理脚本：/etc/init.d/sshd restart
3、注意事项
若服务器主机配置了安全入网规则，需添加新配置的端口
转载于:https://my.osc ...
1、使用方式
以root用户登录修改用户密码
mysql>mysql -uroot -p 回车 输入密码 回车 mysql>use mysql mysql>UPDATE user SET password=PASSWORD('输入新密码') WHERE user='root'; mysql>FLUSH PRIVILEGES;
2、忘记root密码如何处理
（1）停止当前mysql服务
service mysqld stop
（2） ...
1、简单介绍
对于系统安装的服务，根据实际情况我们需要对其进行启动、停止或重启。
2、使用场景
新安装需要启动的系统服务
停止不需要的服务
修改配置文件需要重启才能生效的服务
3、使用方式
（1）使用service脚本来调度，格式如下：
service 服务名 start
service 服务名 stop
service 服务名 restart
（2）执行服务自己的管理脚本，以ssh服务为例：
/etc/init.d/sshd start ...
1、简单介绍
crontab用于设置周期性执行的指令，每个用户都拥有自己的定时任务
2、使用场景
定时重启应用服务器
定期备份数据库、日志及其它文件
其它
3、创建定时任务
输入命令 crontab -e 进入编辑器
添加定时任务语句（一行代表一个任务，语句格式请看以下引用）
保存退出
举例：添加任务语句
0 14 * * * echo `date +%Y-%m-%d--%H:%M:%S` >> /test.txt
...
1、简单介绍
MySQL的用户可以分为两大类：
（1）超级管理员用户（root），拥有全部权限
（2）普通用户，由root创建，普通用户只拥有root所分配的权限
2、使用场景
不同的数据库由不同的用户管理。比如小李负责公司项目a，对应管理的是数据库a；而小张负责公司项目b，对应管理的则是数据库b
同一数据库，需要细分到数据表的权限控制
3、创建用户
举例：创建新用户
CREATE USER 'testUser'@'%' IDENTIFIED BY '123 ...
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