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1. Installation Add the Jenkins repository to the yum repos, and install Jenkins from here.

sudo wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat/jenkins.repo

sudo rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key

sudo yum install jenkins

2. Installation of a stable version /n There is also a LTS YUM repository for the LTS Release Line

sudo wget -O /etc/yum.repos.d/jenkins.repo http://pkg.jenkins-ci.org/redhat-stable/jenkins.repo

sudo rpm --import https://jenkins-ci.org/redhat/jenkins-ci.org.key

sudo yum install jenkins

mohanpedala

Add Email-extension plugin

Gmail settings

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Jenkins will accept 5 parameter lets discuss one by one

* * * * * 

1. First parameter- specify minute and range will vary from 0-59

2. Second parameter- specify hours and range will vary from 0-11

3. Third parameter- specify day and range will vary from 0-7 here 0 and 7 will be Sunday

mohanpedala

Tomcat Installation

https://www.vultr.com/docs/how-to-install-apache-tomcat-8-on-centos-7

Troubleshooting:

1. Check whether catalina.sh / setenv.sh java paths match the JAVA_HOME
2. Check the logs > catalina.out / the latest timestamp log file

To get access to the Manage app page:

1. To access Manage App modify server.xml as suggested in the webpage
2. Modify the configuration in context.xml as below

mohanpedala

ICMP (Internet Control Message Protocol) is an error-reporting protocol network devices like routers use to generate error messages to the source IP address when network problems prevent delivery of IP packets.

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• Generate a private key and a CSR(Certificate Signing Request )
• Generate a CSR from an Existing Private Key
• Generate a CSR from an Existing Certificate and Private Key
• Generating SSL Certificates
  • Generate a Self-Signed Certificate
  • Generate a Self-Signed Certificate from an Existing Private Key
  • Generate a Self-Signed Certificate from an Existing Private Key and CSR
  • View Certificates
  • View CSR Entries

• View Certificate Entries

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Getting Started

• vi editor cheat sheet
• netstat
• netcat
• View Kernel IP routing table
• tcpdump
• tcpping
• Creating users, group and assigning users to groups
• Assign Sudo Permissions
• User Accounts

mohanpedala

http://www.techotopia.com/index.php/Remote_Access_to_the_CentOS_Desktop

mohanpedala

Download Oracle JDK 8

1. Visit Oracle JDK download page, look for RPM version.
2. Copy the rpm link and wget it

wget --header "Cookie: oraclelicense=accept-securebackup-cookie" Download link.rpm 

Note: Install wget if missing

sudo yum install wget -y

3. Install oracle jdk8

sudo yum localinstall jdk8 downloaded package name.rpm

4. Verfication java -version

mohanpedala

1. Create a keystore file to store the server's private key and self-signed certificate by executing the following command:

Windows:
"%JAVA_HOME%\bin\keytool" -genkey -alias tomcat -keyalg RSA

Unix:
$JAVA_HOME/bin/keytool -genkey -alias tomcat -keyalg RSA