Author

Bella

Data recovery using Scalpel and Foremost

by Bella March 1, 2023

written by Bella

Data recovery is the process of salvaging and handling the data through the data from damaged, failed, corrupted, or inaccessible secondary storage media when it cannot be accessed normally. The data is recoverable because the information is not immediately removed from the disk. Nowadays many tools are available for recovering lost data. Two of the most popular tool available are Scalpel and Foremost. In this article, let’s see how to recover lost data using these tools. 1. Scalpel Scalpel is an open source file system recovery for Linux and Mac …

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Technical Articles

Outgoing mail issue in Qmail using configured SMTP routes

by Bella February 19, 2023

written by Bella

If you’re having issues with outgoing mail service in Linux-Qmail server, where all outgoing emails or emails to any specific domain are getting stuck in the remote queue, don’t worry. In this article, we provide a step-by-step solution to resolve the issue. The article details the issue and error message, as well as provides a resolution that includes checking the Qmail-SMTP routing, verifying connectivity to the host mentioned as a relay, and restarting the Qmail service. We also provide guidance on checking the mail log and Qmail queue to ensure …

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server Migration

Imapsync Email Migration: Tool usage and examples

by Bella September 23, 2022

written by Bella

Email Migration is a process used to migrate mailbox content from one account to another. The command imapsync is a tool allowing incremental and recursive IMAP transfer from one mailbox to another.By default all folders are transferred, recursively. We sometimes need to transfer mailboxes from one imap server to another. This is called migration. What is imapsync command? imapsync is a good tool because it reduces the amount of data transferred by not transferring a given message if it is already on both sides. Same headers, same message size and …

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Linux Basics

CentOS-7 : Commands and Configuration files

by Bella September 11, 2022

written by Bella

CentOS-7 is now powered by version 3.10.0 of the Linux kernel, with advanced support for Linux Containers and XFS (is a high-performance 64-bit journaling file system) as the default file system. It’s also the first version of CentOS to include the systemd management engine, the firewalld dynamic firewall system, and the GRUB2 boot loader. CentOS 7 supports 64 bit x86 machines. MySQL has been switched with MariaDB. 1. Systemd Systemd is a system and service manager for Linux Operating system. Systemd uses the command ‘systemctl’ to manage service instead of …

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cPanel

Forcefully refreshing disk space usage directly from cPanel

by Bella September 7, 2022

written by Bella

If user disk space usage is reflected incorrectly or not updating in cPanel, there is a way to force refresh the disk quota of cPanel directly from cPanel dashboard. We will be able to remedy this by refreshing the cPanel cache for this user. This can be done by removing the /home/username/.cpanel/datastore directory, which will be recreated upon the next access of that account’s cPanel. ======== Login to cpanel->file manager -> ensure show hidden file is enabled. Go to /home/username/.cpanel Rename datastore/ to something else Then click disk space usage, …

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General Topics

MariaDB vs PostgreSQL vs MongoDB : Comparison

by Bella August 2, 2022

written by Bella

MariaDB is considered as the fork(replica) of MySQL database. It was developed by the same developer as that of MySQL except for the fact MariaDB offers many more additional functionalities to the MySQL engine. PostgreSQL is an alternative to MySQL working on ORDBMS (Object-Relational Database Management System). As a database server, its primary function is to store data, securely and supporting best practices, and retrieve it later, as requested by other software applications, be it those on the same computer or those running on another computer across a network. The …

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General Topics

Process Status : PS

by Bella July 10, 2022

written by Bella

A process is a single program running in its own virtual address space. Using this definition, everything running under Linux is a process. The process is a running instance of a program. Linux is a multitasking operating system, which means that more than one process can be active at once. PS can show you the running processes on your system in different ways. Several types of processes are involved with the Linux operating system. Each has its own special features and attributes: An interactive process is a process initiated from …

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Server Security Server Tweaking Technical Articles

CVE-2017-5638: Apache Struts 2 Vulnerability

by Bella March 16, 2017

written by Bella

Apache Struts 2 is an open-source development framework for Java applications. On March 6th, 2017, a vulnerability tracked as CVE-2017-5638 in Apache Struts 2 was made public. This vulnerability could allow an attacker to perform remote code execution with malicious Content. This particular vulnerability can be exploited if the attacker sends a request to upload a file to a vulnerable server that uses a Jakarta-based plugin to process the upload request. The attacker can then send malicious code in the Content-Type header to execute the command on a vulnerable server. …

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General Topics Server Tweaking Technical Articles

Configuration of HAProxy Load Balancer on CentOS

by Bella March 10, 2017

written by Bella

HAProxy stands for High Availability Proxy. It is a very fast and reliable solution for high availability and load balancing. HAProxy is used as TCP/HTTP Load Balancer and for proxy Solutions. The HAProxy application will share the workload with multiple servers. Steps for Installation and Configuring HAProxy =========== Step 1: Before proceeding with the installation of HAProxy in the server, we need to install the epel repository on our system depending on the operating system version using the following command.

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