How to install Jenkins in Ubuntu ?

https://jenkins.io/ : The leading open source automation server, Jenkins provides hundreds of plugins to support building, deploying and automating any project.

Inside Your Ubuntu box :

root@ip-****:~# lsb_release -a

No LSB modules are available.

Distributor ID: Ubuntu

Description: Ubuntu 16.04.3 LTS

Release: 16.04

Codename: xenial

Setup: =>

You need to have a JDK and JRE installed.
openjdk-7-jre and openjdk-7-jdk are suggested.

Install Java 8 in Ubuntu:

1)

praja@ip-****:/etc/apt/sources.list.d$ sudo add-apt-repository ppa:webupd8team/java

 Oracle Java (JDK) Installer (automatically downloads and installs Oracle JDK7 / JDK8 / JDK9). There are no actual Java files in this PPA.

…

Ubuntu 16.10 Yakkety Yak is no longer supported by Canonical (and thus, Launchpad and this PPA). The PPA supports Ubuntu 17.10, 17.04, 16.04, 14.04 and 12.04.

…

Oracle JDK 9 is now considered stable. There are currently only 64bit builds (no other builds are available for download: http://www.oracle.com/technetwork/java/javase/downloads/index.html )

 More info: https://launchpad.net/~webupd8team/+archive/ubuntu/java

Press [ENTER] to continue or ctrl-c to cancel adding it

OK

praja@ip-****:/etc/apt/sources.list.d$ ls

webupd8team-ubuntu-java-xenial.list

praja@ip-172-31-17-211:/etc/apt/sources.list.d$ cat webupd8team-ubuntu-java-xenial.list 

deb http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main

# deb-src http://ppa.launchpad.net/webupd8team/java/ubuntu xenial main

2)

praja@ip-****:~/jenkins$ sudo apt-get update

Get:1 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial InRelease [17.5 kB]

Hit:2 http://ap-south-1.ec2.archive.ubuntu.com/ubuntu xenial InRelease          

Get:3 http://ap-south-1.ec2.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]                   

Hit:4 http://security.ubuntu.com/ubuntu xenial-security InRelease                   

Get:5 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial/main amd64 Packages [2,912 B]                   

Get:6 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial/main Translation-en [1,260 B]                

Get:7 http://ap-south-1.ec2.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]

Fetched 226 kB in 0s (239 kB/s)

Reading package lists... Done

3)

praja@ip-****:~/jenkins$ sudo apt-get install oracle-java8-installer

Reading package lists... Done

Building dependency tree       

Reading state information... Done 

4)

praja@ip-****:~/jenkins$ javac -version

javac 1.8.0_151

Oracle JDK 8 installed

Optional:

set JAVA_HOME

praja@ip-****:/usr/lib$ sudo update-alternatives --config java

There is 1 choice for the alternative java (providing /usr/bin/java).

  Selection    Path                                     Priority   Status

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

  0            /usr/lib/jvm/java-8-oracle/jre/bin/java   1081      auto mode

* 1            /usr/lib/jvm/java-8-oracle/jre/bin/java   1081      manual mode

Open => <sudo nano /etc/environment>

Update java home path.

PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games"

JAVA_HOME="/usr/lib/jvm/java-8-oracle"

praja@ip-****:/usr/lib$ source /etc/environment

praja@ip-****:/usr/lib$ echo $JAVA_HOME

/usr/lib/jvm/java-8-oracle

Install Jenkins :

1)

praja@****:~/jenkins$ wget -q -O - https://pkg.jenkins.io/debian/jenkins-ci.org.key | sudo apt-key add -

OK

2)

praja@ip-****:~/jenkins$ sudo sh -c 'echo deb http://pkg.jenkins.io/debian-stable binary/ > /etc/apt/sources.list.d/jenkins.list'

3)

praja@ip-****:~/jenkins$ sudo apt-get update

Hit:1 http://ppa.launchpad.net/webupd8team/java/ubuntu xenial InRelease

Hit:2 http://security.ubuntu.com/ubuntu xenial-security InRelease        

Hit:3 http://ap-south-1.ec2.archive.ubuntu.com/ubuntu xenial InRelease            

Get:4 http://ap-south-1.ec2.archive.ubuntu.com/ubuntu xenial-updates InRelease [102 kB]           

Ign:5 http://pkg.jenkins.io/debian-stable binary/ InRelease                                                 

Get:6 http://pkg.jenkins.io/debian-stable binary/ Release [2,042 B]               

Get:7 http://ap-south-1.ec2.archive.ubuntu.com/ubuntu xenial-backports InRelease [102 kB]

Get:8 http://pkg.jenkins.io/debian-stable binary/ Release.gpg [181 B]

Get:9 http://pkg.jenkins.io/debian-stable binary/ Packages [12.5 kB]

Fetched 219 kB in 1s (181 kB/s)

Reading package lists... Done

4)

praja@ip-****:~/jenkins$ sudo apt-get install jenkins

Reading package lists... Done

Building dependency tree       

Reading state information... Done

…

Processing triggers for ureadahead (0.100.0-19) ...

Check Service -

praja@ip-****:~/jenkins$ sudo /etc/init.d/jenkins status

● jenkins.service - LSB: Start Jenkins at boot time

   Loaded: loaded (/etc/init.d/jenkins; bad; vendor preset: enabled)

   Active: active (exited) since Thu 2017-12-28 06:48:39 UTC; 3min 14s ago

     Docs: man:systemd-sysv-generator(8)

    Tasks: 0

   Memory: 0B

      CPU: 0

Dec 28 06:48:38 ip-172-31-17-211 systemd[1]: Starting LSB: Start Jenkins at boot time...

Dec 28 06:48:38 ip-172-31-17-211 jenkins[17388]:  * Starting Jenkins Automation Server jenkins

Dec 28 06:48:38 ip-172-31-17-211 su[17409]: Successful su for jenkins by root

Dec 28 06:48:38 ip-172-31-17-211 su[17409]: + ??? root:jenkins

Dec 28 06:48:38 ip-172-31-17-211 su[17409]: pam_unix(su:session): session opened for user jenkins by (uid=0)

Dec 28 06:48:39 ip-172-31-17-211 jenkins[17388]:    ...done.

Dec 28 06:48:39 ip-172-31-17-211 systemd[1]: Started LSB: Start Jenkins at boot time.

** jenkins user is created to run the service

praja@ip-****:~/jenkins$ id jenkins

uid=112(jenkins) gid=116(jenkins) groups=116(jenkins)

Log file location -

praja@ip-172-31-17-211:~/jenkins$ tail /var/log/jenkins/jenkins.log 

Dec 28, 2017 6:48:59 AM hudson.model.DownloadService$Downloadable load

INFO: Obtained the updated data file for hudson.tasks.Maven.MavenInstaller

…

Config file -

praja@ip-172-31-17-211:~/jenkins$ cat /etc/default/jenkins

For More Info:

https://wiki.jenkins.io/display/JENKINS/Installing+Jenkins+on+Ubuntu