added jenkins_installation file

Author: yankils

jenkins/jenkins_installation.md

@@ -0,0 +1,80 @@
+# Install Jenkins on AWS EC2
+Jenkins is a self-contained Java-based program, ready to run out-of-the-box, with packages for Windows, Mac OS X and other Unix-like operating systems. As an extensible automation server, Jenkins can be used as a simple CI server or turned into the continuous delivery hub for any project.
+
+
+### Prerequisites
+1. EC2 Instance 
+   - With Internet Access
+   - Security Group with Port `8080` open for internet
+1. Java v1.8.x 
+
+## Install Java
+1. We will be using open java for our demo, Get the latest version from http://openjdk.java.net/install/
+   ```sh
+   yum install java-1.8*
+   #yum -y install java-1.8.0-openjdk-devel
+   ```
+
+1. Confirm Java Version and set the java home
+   ```sh
+   java -version
+   find /usr/lib/jvm/java-1.8* | head -n 3
+   JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-<Java version which seen in the above output>
+   export JAVA_HOME
+   PATH=$PATH:$JAVA_HOME
+    # To set it permanently update your .bash_profile
+   vi ~/.bash_profile
+   ```
+   _The output should be something like this,_
+    ```sh
+   [root@~]# java -version
+   openjdk version "1.8.0_151"
+   OpenJDK Runtime Environment (build 1.8.0_151-b12)
+   OpenJDK 64-Bit Server VM (build 25.151-b12, mixed mode)
+   ```
+
+## Install Jenkins
+ You can install jenkins using the rpm or by setting up the repo. We will set up the repo so that we can update it easily in the future.
+1. Get the latest version of jenkins from https://pkg.jenkins.io/redhat-stable/ and install
+   ```sh
+   yum -y install wget
+   sudo wget -O /etc/yum.repos.d/jenkins.repo https://pkg.jenkins.io/redhat-stable/jenkins.repo
+   sudo rpm --import https://pkg.jenkins.io/redhat-stable/jenkins.io.key
+   yum -y install jenkins
+   ```
+
+   ### Start Jenkins
+   ```sh
+   # Start jenkins service
+   service jenkins start
+
+   # Setup Jenkins to start at boot,
+   chkconfig jenkins on
+   ```
+
+   ### Accessing Jenkins
+   By default jenkins runs at port `8080`, You can access jenkins at
+   ```sh
+   http://YOUR-SERVER-PUBLIC-IP:8080
+   ```
+  #### Configure Jenkins
+- The default Username is `admin`
+- Grab the default password 
+- Password Location:`/var/lib/jenkins/secrets/initialAdminPassword`
+- `Skip` Plugin Installation; _We can do it later_
+- Change admin password
+   - `Admin` > `Configure` > `Password`
+- Configure `java` path
+  - `Manage Jenkins` > `Global Tool Configuration` > `JDK`  
+- Create another admin user id
+
+### Test Jenkins Jobs
+1. Create “new item”
+1. Enter an item name – `My-First-Project`
+   - Chose `Freestyle` project
+1. Under the Build section
+	Execute shell: echo "Welcome to Jenkins Demo"
+1. Save your job 
+1. Build job
+1. Check "console output"
+

maven/How_to_deploy_warfile_on_tomcat_server_using_maven.md

@@ -16,15 +16,15 @@ Procedure
      <plugins>
      <plugin>
    			<groupId>org.apache.tomcat.maven</groupId>
-   			<artifactId>tomcat8-maven-plugin</artifactId>
+   			<artifactId>tomcat7-maven-plugin</artifactId>
    			<version>2.2</version>
-   		<configuration>
+   	  	<configuration>
       		<url>http://localhost:8080/manager/text</url>
       		<server>TomcatServer</server>
       		<path>/helloworld-webapp</path>
-   		</configuration>
-   </plugin>
-   </plugins>
+   		  </configuration>
+     </plugin>
+     </plugins>
    ```
 
 1. create settings.xml for credentials