MySQL5.7
结合两篇文章
阿里云服务器CentOS8.2安装MySQL5.7_多学习，多总结-CSDN博客
Mysql安装失败-GPG验证不通过_yaoyaozaiye的博客-CSDN博客
JDK
Linux CentOS 8 安装与配置 JDK - 随风秋叶 - 博客园
# set java environment JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.181-3.b13.el7_5.x86_64 PATH=$PATH:$JAVA_HOME/bin CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export JAVA_HOME CLASSPATH PATH
改为
# set java environment JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk PATH=$PATH:$JAVA_HOME/bin CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export JAVA_HOME CLASSPATH PATH
TOMCAT
百度云下载链接：https://pan.baidu.com/s/1z09zZJJ34Ei3X__cfiOgvQ
提取码：jaof
mkdir /usr/local/java
vim /etc/profile
source /etc/profile
#TOMCAT CATALINA_base=/usr/local/java/apache-tomcat-8.5.59 PATH=$PATH:$CATALINA_base/bin #export 使上述配置⽣效 export CATALINA_base PATH
