1.安装java
https://blog.csdn.net/lyflyyvip/article/details/78265747
2.CentOS7 通过YUM安装MySQL
https://www.cnblogs.com/jorzy/p/8455519.html
3. 手动增加虚拟内存
https://blog.csdn.net/qq_23191031/article/details/50875847
4.安装tomcat
https://www.cnblogs.com/liangweiping/p/5113857.html