Umask in Linux
What is it? Umask in Linux is a Linux command that is used to assign the default file permission sets that will be assigned when a file or a directory will be created by a…
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Linux Pacemaker – the new HA (High Availability)
In the world of running critical application, where we cannot afford downtime caused by hardware failures, it becomes necessary to run cluster of hardware, where the application can be automatically migrated to another running hardware,…
Bacula : Testing Bacula Backup Job
This is a continuation of the post “Bacula Backup Systems (Server)” which can be accessed by clicking here. In this employment the server, database and storage is hosted in one single server. To test the…
SELINUX
SELinux is a set of security rules using which we can control the processes that can access specific files, folders and ports. These processes, files, folders and ports has a special security label called SELinux…
Configuring TLS in Postfix
This post is a continuation on previous posts. It is expected that you have a working Postfix server with Virtual Domain hosting, Dovecot based authentication and filtering using Spamassassin. The previous post in this series can be…
Docker: Mounting a Windows File share to a Container
This document helps to mount a folder shared by a Windows server, to a folder in a CentOS container. Share a folder from the Windows server, so that it can be accessed from any other…
Docker: backup and restore of a database
It is very important to backup databases deployed using containers. Else once the container stops, all data in it will be gone. For this exercise we will continue the example used in previous post that created…
Python : Installing Fabric library in CentOS 7
Fabric is a Python library that can be used to execute shell commands remotely over SSH. This is a very helpful module that can be used in Python by System Administrators to execute command in local…
Jenkins : Workshop – CI/CD – Using Git, Maven and Tomcat
In this example we will first use Git CLI to upload source code to GitHub repository. Then we will use Jenkins which will check for any new code uploaded to GitHub repository every 15 minutes,…
Maven: Use Maven to package a “.war” file (Ready to deploy in Tomcat)
Tomcat is an application server that requires the jave (.jsp) and related files to be packaged in to a “.war” file before uploading then to the server. Once the war file is uploaded, the server…