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How to stop using TLS-SNI-01 with Certbot

Let’s Encrypt is removing support for domain validation with TLS-SNI-01. If you’re using Certbot and received an email titled “Action required: Let’s...

Hypervisor KVM

Have you ever wondered how a cloud works? It is the most fast-growing IT-trend which attracts billions...

How To Make Changes In resolv.conf Permanent in Ubuntu

When you change the DNS configuration using /etc/resolv.conf file, you must have noticed that the changes are not permanent. A reboot and...

How to Setup FTP with ProFTPD in Webmin

After installing Webmin on a VPS or Dedicated Server, you may be wondering how to add and...

How To Backup Mailbox Daily, Weekly and Monthly

For backup mailbox, i am usually using zmmailbox command who has been provided by Zimbra. The command...

Installing PHP 7 on CentOS 6

Installing PHP 7 on CentOS 6 1. To install latest PHP 7, you need to...

How To Find Folder or File Older Than x Days and Move Them To Other Directory or Path

– Create folder /var/www/old_www-7days/ as destination path – Run find and move (in this case older than 7 days) to old_www-7days

How to Install JAVA 8 on Ubuntu 18.04/16.04 using PPA

There are two standard types of installation available are JDK and JRE. JDK (Java Development Kit) provides...

Enable Nginx Status Page

Nginx status page can give realtime data about Nginx’s health. It can help you tweak few Nginx config. Status data can be...

How to install and use snmpwalk

Snmpwalk is a great tool for Linux boxes. You can easily list all OIDs an SNMP host has to offer then filter...
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How To Import QCOW2 Image Into Proxmox

In this guide, we will see how to import QCOW2 into Proxmox hypervisor and how to create a virtual machine using the QCOW2 image...

Remove frozen emails from mail queue – Exim

Emails can build up for a variety of different reasons but mainly results from emails which were undelivered.  When...

Safe Reboot Of Linux Using Magic SysRq Key

If you are working on kernel development, or device drivers, or running a code that could cause a kernel panic, the SysRq...

How to set a MySQL database to read-only mode

When we need to set the database as read-only on the fly (such as rebuild MySQL replication purpose) and we will use...