Crio-Launch-Feb-2020-thummarm097-ME_QBOX

QBox is a secure file-sharing service. It is a customized version of the popularly available VSFTPD server.

During this Micro-Experience, I:

Created pre-install scripts to run system checks, install and configure QBox.

Developed tools to automatically analyze performance and functionality issues in different versions of QBox.

QBox Modules

1. Check system requirements and install QBox

   • Scope of work:
     
     Implemented a pre-installation script that validated the minimum system requirements to be met for QBox installation. The script checked the availability of the following system resources:
     
     - Processor
     - Memory
     - Disk space
     - OS version
     
     
   • Installed the QBox server and connected it to various QBox clients.

2. Debug performance issues and identify regressions

   • Scope of work:
     
     1. Created a performance benchmark using a base version of QBox.
     2. Identified regressions in newer QBox versions (memory usage, cpu usage, file transfer speed, file permission issues).

3. Troubleshoot network issues

   • Scope of work:
     
     1. Collected and analyzed pcap files using Wireshark.
     2. Identified the following network issues in different versions of QBox: TCP retransmissions, connection refusals, dropped connections, sub-optimal TCP window sizes and retransmission delays.
     3. Identified several network issues in different versions of QBox including TCP retransmissions, connection refusals and retransmission delays.
     

4. Enable end-to-end encryption

   • Scope of work:
     
     1. Created SSL certificates and used them to enable secured file transfer.
     2. Snooped network traffic using Wireshark and ensured that it was indeed encrypted.