rpm -qa | grep XXX 查询
一：配java
https://zixuephp.net/article-406.html
二：配ftp
https://blog.csdn.net/qiantanlong/article/details/82909865
https://support.huaweicloud.com/bestpractice-ecs/zh-cn_topic_0115828034.html
三：配mysql
https://www.cnblogs.com/wangshen31/p/9556804.html