DevOps and Middleware Engineering: Install Jenkins on Linux

Jenkins Installation Requirement for the below specific installation:

JDK : jdk1.8.0_161
Memory: 2G
DiskSpace: 50G
Operating System Version: Oracle Linux Server release 6.6
Java Container: apache-tomcat-8.5.30
Jenkins: Jenkins 2.107.2

Jenkins is a software that allows continuous integration.
Jenkins will be installed on a server where the central build will take place

Step 1) Download jdk from oracle site:
http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html

Step 2) Exact the downloaded jdk file to the directory where you want to install java. I have extracted under /home/oracle
cd /home/oracle
gunzip jdk-8u161-linux-x64.tar.gz
tar -xvf jdk-8u161-linux-x64.tar

Step 3) Setup JAVA_HOME
After the extraction you should see the extracted version /home/oracle/jdk1.8.0_161
Go to the user home directory
cd ~
update the .bash_profile

vi .bash_profile
--------------------------------
if [ -f ~/.bashrc ]; then

. ~/.bashrc

fi

# Get the aliases and functions

# User specific environment and startup programs

JAVA_HOME=/home/oracle/jdk1.8.0_161

PATH=$PATH:$JAVA_HOME/bin

export PATH

-------------------------------

Restart the Unix terminal or execute . .bash_profile for setting up JAVA_HOME variable.

Verify the java version by executing the following command.
[oracle@OracleLinux6 ~]$ java -version

java version "1.7.0_21"

Java(TM) SE Runtime Environment (build 1.7.0_21-b11)

Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01, mixed mode)

Step 4) Download and install Apache tomcat application server.

Download the tomcat version from the following site:

https://tomcat.apache.org/download-80.cgi

I have selected the highlighted version for my installation.

Step 4) Extract downloaded tomcat distribution where you want to install.

cd /home/oracle
gunzip apache-tomcat-8.5.30.tar.gz
tar -xvf apache-tomcat-8.5.30.tar

I have the extracted version at /home/oracle/apache-tomcat-8.5.30

Start the tomcat service by executing the following command
cd /home/oracle/apache-tomcat-8.5.30/bin

[oracle@OracleLinux6 bin]$ ./startup.sh

Using CATALINA_BASE: /home/oracle/apache-tomcat-8.5.30
Using CATALINA_HOME: /home/oracle/apache-tomcat-8.5.30
Using CATALINA_TMPDIR: /home/oracle/apache-tomcat-8.5.30/temp
Using JRE_HOME: /home/oracle/jdk1.8.0_151
Using CLASSPATH: /home/oracle/apache-tomcat-8.5.30/bin/bootstrap.jar:/home/oracle/apache-tomcat-8.5.30/bin/tomcat-juli.jar
Tomcat started.

Access the Tomcat console from web browser.

http://hostname:8080

Step 5) Download and deploy Jenkins war file on tomcat

Download jenkins.war from the following URL:

https://jenkins.io/download/

Step 6) Copy the jenkins.war file to the webapp directory and restart tomcat instance for deployment.

cp /home/oracle/Downloads/jenkins.war /home/oracle/apache-tomcat-8.5.30/webapps/

[oracle@OracleLinux6 webapps]$ ls -rlt
total 72924
drwxr-x---. 3 oracle oracle 4096 Apr 11 21:09 ROOT
drwxr-x---. 5 oracle oracle 4096 Apr 11 21:09 manager
drwxr-x---. 5 oracle oracle 4096 Apr 11 21:09 host-manager
drwxr-x---. 6 oracle oracle 4096 Apr 11 21:09 examples
drwxr-x---. 14 oracle oracle 4096 Apr 11 21:09 docs
-rw-rw-r--. 1 oracle oracle 74568464 Apr 11 21:17 jenkins.war

SHUTDOWN
/home/oracle/apache-tomcat-8.5.30/bin
[oracle@OracleLinux6 bin]$ ./shutdown.sh
Using CATALINA_BASE: /home/oracle/apache-tomcat-8.5.30
Using CATALINA_HOME: /home/oracle/apache-tomcat-8.5.30
Using CATALINA_TMPDIR: /home/oracle/apache-tomcat-8.5.30/temp
Using JRE_HOME: /home/oracle/jdk1.7.0_21
Using CLASSPATH: /home/oracle/apache-tomcat-8.5.30/bin/bootstrap.jar:/home/oracle/apache-tomcat-8.5.30/bin/tomcat-juli.jar

STARTUP
[oracle@OracleLinux6 bin]$ ./startup.sh
Using CATALINA_BASE: /home/oracle/apache-tomcat-8.5.30
Using CATALINA_HOME: /home/oracle/apache-tomcat-8.5.30
Using CATALINA_TMPDIR: /home/oracle/apache-tomcat-8.5.30/temp
Using JRE_HOME: /home/oracle/jdk1.7.0_21
Using CLASSPATH: /home/oracle/apache-tomcat-8.5.30/bin/bootstrap.jar:/home/oracle/apache-tomcat-8.5.30/bin/tomcat-juli.jar
Tomcat started.

Step 7) Access the Jenkins URL on your web browser.
http://hostname:8080/jenkins