jdk 安装包下载
    https://www.oracle.com/java/technologies/javase/javase8-archive-downloads.html

    1. cd /tmp
    2. tar xf jdk-8u191-linux-x64.tar.gz -C /usr/local
    3. ln -s /usr/local/jdk1.8.0_191/ /usr/local/jdk
    5. rm -rf /usr/bin/java
    6. ln -s /usr/local/jdk/bin/java  /usr/bin/java
    9. cat >> /etc/profile << EOF
    10. export JAVA_HOME=/usr/local/jdk
    11. export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
    12. export PATH=$JAVA_HOME/bin:$PATH
    13. EOF
    14. source /etc/profile
    17. tar xf apache-maven-3.5.3-bin.tar.gz  -C /usr/local
    18. mv /usr/local/apache-maven-3.5.3 maven-3.5.3
    19. ln -s  /usr/local/maven-3.5.3/ /usr/local/maven  
    21. systemctl start jenkins
    22. chkconfig --add jenkins
    23. systemctl status jenkins
    26. sudo tee /etc/profile <<-'EOF'
    27. export JAVA_HOME=/usr/local/jdk
    28. export CLASSPATH=.:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
    29. export PATH=$JAVA_HOME/bin:$PATH
    30. MAVEN_HOME=/usr/local/maven
    31. export MAVEN_HOME
    32. export PATH=${PATH}:${MAVEN_HOME}/bin
    33. EOF
    34. source /etc/profile
    36. mvn -v
    37. java -version