Operation and Maintenance
Linux Operation and Maintenance
Detailed explanation of the steps to install JDK on Linux
Detailed explanation of the steps to install JDK on Linux
1. Check the jdk version in the system
[root@localhost software]# java -version
Display:
openjdk version "1.8.0_102"OpenJDK Runtime Environment (build 1.8.0_102-b14) OpenJDK 64-Bit Server VM (build 25.102-b14, mixed mode)
2. Check the jdk installation package
[root@localhost software]# rpm -qa | grep java
Display:
java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64 python-javapackages-3.4.1-11.el7.noarch tzdata-java-2016g-2.el7.noarch javapackages-tools-3.4.1-11.el7.noarch java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64 java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64 java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64
3. Uninstall openjdk
[root@localhost software]# rpm -e --nodeps tzdata-java-2016g-2.el7.noarch[root@localhost software]# rpm -e --nodeps java-1.7.0-openjdk-1.7.0.111-2.6.7.8.el7.x86_64[root@localhost software]# rpm -e --nodeps java-1.7.0-openjdk-headless-1.7.0.111-2.6.7.8.el7.x86_64[root@localhost software]# rpm -e --nodeps java-1.8.0-openjdk-1.8.0.102-4.b14.el7.x86_64[root@localhost software]# rpm -e --nodeps java-1.8.0-openjdk-headless-1.8.0.102-4.b14.el7.x86_64
and then enter rpm -qa | grep java again Check the uninstallation status:
[root@localhost software]# rpm -qa | grep javapython-javapackages-3.4.1-11.el7.noarch javapackages-tools-3.4.1-11.el7.noarch
4. Install a new jdk
First go to the jdk official website to download the jdk version you want. After the download is complete, you will need to install the jdk Place the installation package in the folder specified by the Linux system, and enter the command to enter the folder:
[root@localhost software]# lltotal 252664 -rw-r--r--. 1 root root 11830603 Jun 9 06:43 alibaba-rocketmq-3.2.6.tar.gz-rw-r--r--. 1 root root 43399561 Jun 9 06:42 apache-activemq-5.11.1-bin.tar.gz-rwxrw-rw-. 1 root root 185540433 Apr 21 09:06 jdk-8u131-linux-x64.tar.gz-rw-r--r--. 1 root root 1547695 Jun 9 06:44 redis-3.2.9.tar.gz-rw-r--r--. 1 root root 16402010 Jun 9 06:40 zookeeper-3.4.5.tar.gz
Extract the jdk-8u131-linux-x64.tar.gz installation package
[root@localhost software]# mkdir -p /usr/lib/jvm[root@localhost software]# tar -zxvf jdk-8u131-linux-x64.tar.gz -C /usr/lib/jvm
5. Set environment variables
[root@localhost software]# vim /etc/profile
Add at the front:
export JAVA_HOME=/usr/lib/jvm/jdk1.8.0_131
export JRE_HOME=${JAVA_HOME}/jre
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH6. Execute profile File
[root@localhost software]# source /etc/profile
This allows the configuration to take effect immediately without restarting.
7. Check the newly installed jdk
[root@localhost software]# java -version
Display:
java version "1.8.0_131"Java(TM) SE Runtime Environment (build 1.8.0_131-b11) Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)
That’s it, the entire installation process is over.
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