Java Update Guide Centos 7 / RHEL 7

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# java -version
java version "1.7.0_141"
OpenJDK Runtime Environment (rhel-2.6.10.1.el7_3-x86_64 u141-b02)
OpenJDK 64-Bit Server VM (build 24.141-b02, mixed mode)

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# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u144-b01/090f390dda5b47b9b721c7dfaa008135/jdk-8u144-linux-i586.tar.gz"

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# wget --no-cookies --no-check-certificate --header "Cookie: gpw_e24=http%3A%2F%2Fwww.oracle.com%2F; oraclelicense=accept-securebackup-cookie" "http://download.oracle.com/otn-pub/java/jdk/8u144-b01/090f390dda5b47b9b721c7dfaa008135/jdk-8u144-linux-x64.tar.gz"

# du -sh jdk-8u144-linux-x64.tar.gz
177M    jdk-8u144-linux-x64.tar.gz
# tar -xvf jdk-8u144-linux-x64.tar.gz


[root@Arkit-Serv java]# update-alternatives --install /usr/bin/java java /opt/java/jdk1.8.0_144/bin/java 100
[root@Arkit-Serv java]# update-alternatives --config java

There are 3 programs which provide 'java'.

  Selection    Command
-----------------------------------------------
*+ 1           java-1.7.0-openjdk.x86_64 (/usr/lib/jvm/java-1.7.0-openjdk-1.7.0.141-2.6.10.1.el7_3.x86_64/jre/bin/java)
   2           /usr/java/jdk1.8.0_144/jre/bin/java
   3           /opt/java/jdk1.8.0_144/bin/java

Enter to keep the current selection[+], or type selection number: 3


[root@Arkit-Serv java]# export JAVA_HOME=/opt/java/jdk1.8.0_144/
[root@Arkit-Serv java]# export JRE_HOME=/opt/java/jdk1.8.0_144/jre
[root@Arkit-Serv java]# export PATH=$PATH:/opt/java/jdk1.8.0_144/bin:/opt/java/jdk1.8.0_144/jre/bin

# java -version
java version "1.8.0_144"
Java(TM) SE Runtime Environment (build 1.8.0_144-b01)
Java HotSpot(TM) 64-Bit Server VM (build 25.144-b01, mixed mode)

That's it Java Updated.

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Failed To Load SELINUX policy. Freezing error after reboot on Centos 7/RHEL7?

system[1]: Failed to load SELinux policy. Freezing error after reboot on Centos 7/RHEL7?

 Most of the time you will get this error "while resetting the root password". That means you are not correctly reset the root password (or) mismatch words in the "touch /.autorelabel" command.

"touch /.autorelabel" -->  create an hidden file under the slash which means SELinux will automatically relabel the SELinux policy when server is booting

SELinux Load Error

1) Reboot your machine

2) Loading boot menu then press key to stop the boot menu, edit(press 'e') kernel line.

Change String SELInux

3) Goto "linux16" word and append the word "selinux=0".

4) reboot the server.

That't it.

Installing nagios core got error - Resolution

While installing nagios core got error make all command on RHEL7/centos 7:

while installing nagios core on RHEL7  got the issue that is "(cd angularjs && unzip -u angular-1.3.9.zip),/bin/sh: unzip: command not found". The error occur after enter the command make all . On my server have already installed gcc so the error was coming from some other dependency requirement.

[root@serverx nagios-4.1.1]# make all
gcc -Wall -I.. -g -O2 -DHAVE_CONFIG_H -DNSCORE -o nagiostats nagiostats.c  -lm  ../lib/libnagios.a
make[1]: Leaving directory `/tmp/nagios-4.1.1/base'
cd ./cgi && make
make[1]: Entering directory `/tmp/nagios-4.1.1/cgi'
make[1]: Nothing to be done for `all'.
make[1]: Leaving directory `/tmp/nagios-4.1.1/cgi'
cd ./html && make
make[1]: Entering directory `/tmp/nagios-4.1.1/html'
(cd angularjs && unzip -u angular-1.3.9.zip)
/bin/sh: unzip: command not found
make[1]: * [all] Error 127
make[1]: Leaving directory `/tmp/nagios-4.1.1/html'
make: * [all] Error 2
[root@serverx nagios-4.1.1]#


Observed the above error i.e "unzip command not fund", Installed the unzip package by following below command

# yum install -y unzip

After installed the unzip package, rerun the configure command issue has been resolved.


That's it.