Ruby on Rails json LoadError

Problem:
Running Ruby on Rails 'bin/rails s' and you get an error

in require: cannot load such file -- json (LoadError)


Solution:
Edit the Gemfile and add

gem 'json'

Installing Ruby on Rails on AWS Linux

To install Ruby on Rails on the AWS Linux VM, you need to install some prerequisites first.

sudo su -
yum install -y ruby24
alternatives --set ruby /usr/bin/ruby2.4
yum install -y ruby24-devel rubygems ruby24-devel gcc zlib-devel patch sqlite-devel
curl -sL https://rpm.nodesource.com/setup | bash -
yum install -y nodejs

gem install rails
rails --version

Add hard disk to VMware CentOS 7 VM

There are two easy steps to add a hard disk for a a VMware CentOS 7 VM

1.  Assign a new hard disk in VMware vSphere
2.  Configure the new hard disk in CentOS

See the full picture tutorial at
https://dev.to/juttayaya/add-hard-disk-to-vmware-centos-7-vm-22m8

Get the original username of sudo

For auditing and logging purposes, I needed to get the original Unix login username and not the sudo account name.

The Unix command to get the original login username is

logname 

With the logname command, the operator can su and sudo to various accounts and it will still display the original login.

To try it on a Unix prompt

sudo su - oracle
echo My sudo id is $(whoami) and my login id is $(logname)

Output:
My sudo id is oracle and my login id is juttayaya

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Reference:https://stackoverflow.com/questions/4598001/how-do-you-find-the-original-user-through-multiple-sudo-and-su-commands