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Check the system version
[root@zabbix ~]# cat /etc/redhat-release CentOS Linux release 7.1.1503 (Core) [root@zabbix ~]# uname -a Linux zabbix.com 3.10.0-229.el7.x86_64 #1 SMP Fri Mar 6 11:36:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
1. Check whether the JDK that comes with Linux has been installed
# java -version
2 , View JDK information
# rpm -qa | grep java
Display:
java-x.x.x-gcj-compat-x.x.x.x-xxjpp.xxx
java-x.x.x-openjdk-x.x.x.x-x.x.bxx.exx
3. Uninstall (there are several uninstalls)
# rpm -e --nodeps java-x.x.x-gcj-compat- x.x.x.x-xxjpp.xxx
# rpm -e --nodeps java-x.x.x-openjdk-x.x.x.x-x.x.bxx.exx
There are some other commands
rpm - qa | grep gcj
rpm -qa | grep jdk
If the openjdk source cannot be found, you can also uninstall it like this
yum -y remove java java-x.x.x -gcj-compat-x.x.x.x-xxjpp.xxx
yum -y remove java java-x.x.x-openjdk-x.x.x.x-x.x.bxx.exx
4. Install JDK
Download Address: (JDK1.7)
http://download.oracle.com/otn-pub/java/jdk/7u79-b15/jdk-7u79-linux-x64.rpm
Place it under /usr/local/src and execute the following installation command:
# rpm -ivh jdk-7u79-linux-x64.rpm
It will be installed under /usr/java by default
5. Check whether it is installed
# java -version
Display: jvav version "1.7.0_79" ...indicates success
6. Configure environment variables
# vi /etc/profile
Add the following lines at the end:
JAVA_HOME=/usr/java/jdk1.7.0_71
CLASS_PATH= .:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar
PATH=$JAVA_HOME/bin:$PATH
export JAVA_HOME CLASS_PATH PATH
# reboot Restart the machine configuration to take effect
Or execute the following command to take effect immediately
#source /etc/profile
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