yum节省安装时间

yum install java-1.8.0-openjdk 安装jdk

yum install tomcat 安装tomcat

wget http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
rpm -ivh mysql-community-release-el7-5.noarch.rpm
yum install mysql-server 安装mysql

重置密码

重置密码前，首先要登录

$ mysql -u root
登录时有可能报这样的错：ERROR 2002 (HY000): Can‘t connect to local MySQL server through socket ‘/var/lib/mysql/mysql.sock‘ (2)，原因是/var/lib/mysql的访问权限问题。下面的命令把/var/lib/mysql的拥有者改为当前用户：

$ sudo chown -R openscanner:openscanner /var/lib/mysql
然后，重启服务：

$ service mysqld restart
接下来登录重置密码：

$ mysql -u root
mysql > use mysql;mysql > update user set password=password(‘123456‘) where user=‘root‘;mysql > exit;

systemctl status tomcat.service 查看tomcat是否死亡状态，如果死亡状态进行下一步

systemctl start tomcat.service 跑tomcat

systemctl stop tomcat.service 停止

systemctl restart tomcat.service重启

systemctl enable tomcat 设置开机启动

systemctl stop firewalld.service 关闭防火墙

如果usr/share/tomcat/apps里面为空，输入yum install tomcat-webapps tomcat-admin-webapps

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