1, yum command to install jdk
Select the version installed
yum install -y java-1.8.0-openjdk java-1.8.0-openjdk-devel
Or the following command to install all the files jdk1.8.0
yum install -y java-1.8.0-openjdk*
yum install -y java-1.8.0-openjdk.x86_64
2, see JDK installation was successful
# java -version
[root@1c164311bb8b /]# java -version openjdk version "1.8.0_222" OpenJDK Runtime Environment (build 1.8.0_222-b10) OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)
3, configure the environment variables
JDK default installation path / usr / lib / jvm
[root@1c164311bb8b jvm]# pwd /usr/lib/jvm [root@1c164311bb8b jvm]# [root@1c164311bb8b jvm]# ll total 0 drwxr-xr-x. 3 root root 17 Jul 30 05:48 java-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64 lrwxrwxrwx. 1 root root 21 Jul 30 05:48 jre -> /etc/alternatives/jre lrwxrwxrwx. 1 root root 27 Jul 30 05:48 jre-1.8.0 -> /etc/alternatives/jre_1.8.0 lrwxrwxrwx. 1 root root 35 Jul 30 05:48 jre-1.8.0-openjdk -> /etc/alternatives/jre_1.8.0_openjdk lrwxrwxrwx. 1 root root 51 Jul 30 05:48 jre-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64 -> java-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64/jre lrwxrwxrwx. 1 root root 29 Jul 30 05:48 jre-openjdk -> /etc/alternatives/jre_openjdk [root@1c164311bb8b jvm]#
In the / etc / profile file add the following command
# set java environment JAVA_HOME=/usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64 PATH=$PATH:$JAVA_HOME/bin CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar export JAVA_HOME CLASSPATH PATH
Save and close the file profile, execute the following command to take effect
source /etc/profile
4, when writing Dockerfile files, only variable to define a container (third portion may be omitted)
ENV JAVA_HOME /usr/lib/jvm/jre-1.8.0-openjdk-1.8.0.222.b10-0.el7_6.x86_64
Reference blog:
DOCKER installation CENTOS, TOMCAT, JDK other custom related (DOCKERFILE) Mirror
Installation and Configuration CentOS 7 yum JDK
https://blog.csdn.net/github_38336924/article/details/82221258