VMware Worstation installation on Ubuntu 18.04.2 LTS - GNU C Compiler (gcc) version 7.4.0 was not found

VMware Workstation will help us to run multiple operating systems as virtual machines (VMs) on a single Linux or Windows PC, which we can leverage to build or test software as required.

Download VMware workstation Pro below:

For Linux:

For Windows:

Installing VMware Workstation pro on Ubuntu:

Once VMware workstation Download, You can make  downloaded file executable using below command:

sudo chmod +x VMware-Workstation-Full-15.1.0-13591040.x86_64.bundle

Now you can run installer as below:

sudo ./VMware-Workstation-Full-15.1.0-13591040.x86_64.bundle

Installer will prompt for few basic questions for your input, after passing those details installer will complete installation with Finish Message.

Error:GNU C Compiler (gcc) version 7.4.0 was not found

Post installation, when you are trying open workstation you will get this error and it will ask for GCC location to manually browse.

You can run below command to fix this:

sudo apt-get install build-essential linux-headers-generic

ow again you can open workstation, now it will prompt to install, once you click on install it will proceed and complete final dependent installation.

Hopefully, You enjoyed this post.

Analyzing large Java heap dumps using Memory Analyzer CLI in Linux

Description:

When you have a situation or need to analyze really large heap dump (like 30/40 GB), then most of the times MAT UI will fail to analyze such large files, in that case you can use Memory Analyzer CLI in Linux/Windows. In this post we will see how we use analyzer tool in Linux

Pre-req to setup 

• Make sure you have enough physical / virtual (VM) memory available. (~at least equal to size of the file to make memory analyzer run smooth). 
• Make Sure you have tool downloaded from here http://www.eclipse.org/mat/downloads.php 
• Make sure you have necessary privileges or access on Linux system.

Steps to Follow

• unzip download memory analyzer tool using unzip command 
• unzip MemoryAnalyzer-1.7.0.20170613-linux.gtk.x86_64.zip
• mat folder will be created then run "cd mat"
• Run command to start dump analyzer
• ./ParseHeapDump.sh /dumps/heap.date.bin ls -vmargs -Xmx40g -XX:-UseGCOverheadLimit
• Xmx40g  - Here 40g represents allocated memory in GB for this process alter this as required.
• /dumps/heap.date.bin - This file represent your dump file alter the filename with full path in it as required.
• Above command will take time based on the size of the dump file and it will generate index files on the directory where your dump file exists
• Now to generate html files run below command
• ./ParseHeapDump.sh /dumps/heap.date.bin org.eclipse.mat.api:suspects
• org.eclipse.mat.api:suspects - represents report type
• Below are the other report types available

                              org.eclipse.mat.api:suspects
                org.eclipse.mat.api:overview
                org.eclipse.mat.api:top_components 

• Above command will generate jvm_suspects.zip file which consists html files.
• Now these html reports can be shared with anybody by scp/email/ftp as required.

Installation and Setup Jenkins on Centos 7.x

Preparing Node (CenOS)

• Setup Appropriate Hostname with FQDN

          echo "jenkins.rulepaper.com" > /etc/hostname

• Install wget if your node installed with minimal OS installation

          sudo yum install wget -y

• Install Java if it is not already exists

          sudo yum install java -y

• Update system 

     sudo yum update

Installation of a stable Jenkins version

• 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 -y

• set the jenkins service to start while booting "sudo chkconfig jenkins on"

• Start the jnekins service "service jenkins start"

Configuration of Jenkins

• Open Jenkins home page using your favourite browser http://hostname:8080 or http://ip-address:8080 

• As mentioned in above pic, get your secure password from mentioned file using cat /var/lib/jenkins/secrets/initialAdminPassword

• After validating your secret password, page will proceed wot SetupWizard

• You can select "install suggested Plugin" option to proceed with plugin installation.

• Suggested plugin installation will start and right side you will see installation status.
• Post installation it will prompt us to create first admin user.

• File the user details and click on "Save and Continue", followed by instance configuration click on "Save and Finish".

• Now Jenkins is ready to start using it click on "Start using Jenkins".

• It will take you to the Jenkins home page.

Will post a video soon on about "Explore Jenkins in Realtime"