Should you learn CentOS or Ubuntu for most job prospects?

CentOS is a midstream of RHEL. The upstream of RHEL is Fedora. Fedora moves very fast; CentOS moves fairly quickly with the sig work, and RHEL is a snail.

Operating System Support Lifecycle

Operating System Support Lifecycle

Centos 7

The CentOS Linux distribution is a stable, predictable, manageable and reproducible platform derived from the sources of Red Hat Enterprise Linux (RHEL)

Video Tutorial

Video Tutorial

Tuesday, July 7, 2020

Tomcat Clustering - Session Replication

Tomcat Clustering - Session Replication

Web App Cart Tomcat Cluster - Session Replication 

Tomcat clustering with 2 instance on 2 webserver

How it Works

To make it easy to understand how clustering works, we are gonna to take you through a series of scenarios. In this scenario we only plan to use two tomcat instances TomcatA and TomcatB. We will cover the following sequence of events:

  1. TomcatA starts up
  2. TomcatB starts up (Wait the TomcatA start is complete)
  3. TomcatA receives a request, a session S1 is created.
  4. TomcatA crashes
  5. TomcatB receives a request for session S1
  6. TomcatA starts up
  7. TomcatA receives a request, invalidate is called on the session (S1)
  8. TomcatB receives a request, for a new session (S2)
  9. TomcatA The session S2 expires due to inactivity.

Manager Sticky Session

Check session manager tomcat - type primary and backup

Logs Session Replication - Listening for node worker 

Logs worker listening 

Session must keep with session name 48A7AF7AFFA96775AEEB6648EF82B2AC and just change name instance when crash 1 instance



Contact admin to see all video configuaration
[email protected]

Tomcat Clustering - Multi-Instance Tomcat In 1 Server

Tomcat Clustering - Multi-Instance In 1 Server

Contact admin to see all video configuaration
[email protected]

Friday, March 13, 2020

How to install SSL Tomcat on Linux Centos 7

How to install SSL Tomcat on Linux Centos 7

How to install SSL Tomcat on Linux Centos 7
 Làm sao để cài đặt SSL Tomcat on  Linux Centos 7



Đam Mê Linux

Tuesday, March 10, 2020

How to install SSL Tomcat on Window

How to install SSL Tomcat on Window

How to install SSL Tomcat on Window
 Làm sao để cài đặt SSL Tomcat on Window



How to be System Admin Centos ? 
How to master Centos ? 
Làm thế nào để trở thành System Admin Centos 
Làm thế nào giỏi Centos