servlet 运维解决jenkins需要jdk11，项目需要jdk8的问题

思路：jdk8 采用解压缩模式，jdk11采用安装模式，然后在jenkins中指定jdk路径

下载解压缩jdk8

https://www.oracle.com/java/technologies/downloads/#java8 解压缩：jdk-8u391-linux-i586.tar.gz

/lib/ld-linux.so.2: bad ELF interpreter: 没有那个文件或目录 yum install glibc.i686

安装jdk11

安装

yum -y install java-11-openjdk

卸载

yum remove -y java-11-openjdk.x86_64

yum remove -y java-11-openjdk-headless.x86_64

查找已经安装的

yum list installed *java*

yum list installed

找java和jdk

卸载

yum remove java-1.8.0-openjdk-headless.x86_64

其他参考命令

yum install wget

yum clean all

yum makecache

yum -y install gcc

yum -y install gcc-c++

yum install -y jenkins

yum install -y vim

yum install -y git

yum install -y unzip

yum install java-1.8.0-openjdk -y

yum remove java-1.8.0-openjdk -y

rpm -qa | grep java

jenkins中指定

金钥匙