If you are sending or forwarding emails from your own server, then it is very important and nearly mandatory to setup DKIM (DomainKeys Identified Mail). DKIM is a method of signing emails digitally with public-key cryptography so that the receiver of the email can validate and verify that the email was indeed send and authorised… Read More »
I have been using a Bluehost vps server for quite some time and it was the Legacy Hosting – “VPS Standard” plan. It came with 30GB of ssd space and 2gb ram and 2 cpu cores. However i noticed that within some time the server started running out of disk space. I was hosting around… Read More »
Memcached is a buzzword whenever it comes to the cache mechanism for modern-day web applications. It is a memory object caching system specifically designed to enhance the speed of web applications by reducing load on the database server. In simpler terms, it takes the memory from that part of the system which is not in… Read More »
Redis (Remote Dictionary Server) is an open-source software used to store structured data, which can be used as a database, cache, or message broker. It is known for its speed and versatility. In this article, you will be guided through the process of installing and securing Redis on an Ubuntu machine. Installation 1. Prerequisites There… Read More »
The command-line use systemctl, which stands for “system control,” is essential for managing services on Linux systems using the systemd init system. It is an important tool for monitoring how services, daemons, and other system components behave. To help you learn how to control services on your Linux system, we’ll go into much detail about… Read More »
The iostat command is a system monitoring tool in Linux that provides comprehensive usage information on input/output (I/O) devices, partitions, and the CPU. This information can be used in analyzing resource allocation and utilization, identifying potential performance issues, and troubleshooting. iostat monitors the active time of I/O devices in relation to their average transfer rates…. Read More »
In this article, we want to introduce you to ‘vmstat’ command, which is one of the top monitoring tools that Linux/UNIX users should know of. The vmstat command is used to retrieve the statistics of CPU, virtual memory, paging, processes, threads, disks, traps, I/O blocks, and so on. This useful command will help you a… Read More »
Maintaining a healthy and productive Linux environment requires effective system log management. The journalctl command has evolved into an essential resource for accessing and analyzing system logs with the introduction of systemd, the system and service manager for recent Linux distributions. The journalctl command’s adaptability and utility on Linux-based systems will be examined thoroughly in… Read More »
MySQL is one of the most popular relational database management systems (RDMS) available. While it’s an ideal RDMS for both small and large-scale applications, being free and open-source (before Oracle acquired it) made it even more popular and versatile. If you are running web applications or database applications on linux servers, then most likely you… Read More »
This article explores the ‘blkid’ command, whose purpose is retrieving information about block devices, LABEL, UUID, file system type, etc. The useful command can help us to identify or troubleshoot issues related to block devices and their attributes. Installation To use ‘blkid’ command, your Linux system needs to have the ‘util-linux’ package installed. blkid: command… Read More »
Iotop is an open-source and free utility Linux command used to display the statistics of disk input/output by processor/threads and print the summary which gets refreshed every second. It is quite similar to the top command, except that iotop monitors just disk i/o and not other metrics. This command is particularly useful for system administrators… Read More »
sar (System Activity Reporter) is a command line tool used to collect, report, and analyze system activity information in Linux and other Unix-based operating systems. In other words, it gathers information and provides insights on system activity, such as CPU utilization, memory usage, I/O operations, network activity, disk usage, power management, and much more, which… Read More »
Spam free email with SpamAssassin If you are running your own mailbox on a server using Postfix and Dovecot then it is imperative to install an anti-spam software to protect your mailbox from getting bombed with incoming spam mails. And for this SpamAssassin is one of the best solutions available out there. It is quite… Read More »
Dante Socks5 Server Dante is a socks5 server that you can use to setup a socks5 proxy on your ubuntu or debian machine. In this quick tutorial we shall learn how to setup dante and use authentication. With authentication enabled, the dante proxy server would require all clients to provide login details in order to… Read More »
Running desktop on remote server Usually you would use the ssh terminal when working on a remote linux server. But there can be times when you need to run a gui app on the server and keep it running for quite some time. Recently I had to do something similar and therefore I setup an… Read More »
Socks proxy via ssh Tunnel I often come across websites that block me because my isp is on some blacklist somewhere. The only option then is to access the website through some kind of proxy server, which are quite hard to find. The best solution for me was to use my own linux servers as… Read More »
Monit is a powerful tool to monitor background services and processes on your linux server. This post shows how to setup and configure Monit on Ubuntu and Debian based servers.
This tutorial shows you how to install and configure a mail server with Postfix and Dovecot on a Ubuntu or Debian based linux server. Postfix is the SMTP server and Dovecot is the IMAP/POP server.
Quick tutorial with simple examples of how to use the mailx command on Linux to send emails from command line with features like attachments and external smtp servers.
Tutorial on how to monitor network and socket connections on linux with ss command ( socket statistics )