Monday, October 25, 2021

How to

Converting between image formats

qemu-img convert: raw, qcow2, qed, vdi, vmdk, vhd The qemu-img convert command can do conversion between multiple formats, including qcow2, qed, raw, vdi, vhd, and vmdk.

Migrate MyISAM tables to INNODB using mysqldump

In this article you will find information how to convert MyISAM tables to INNODB.  The procedure here is an...

Test TCP Port 25 (smtp) access with telnet

In this article I show you how to use telnet to test the access to a mail server on TCP port 25.

Configure Disk Quota on Ubuntu Server

Scenario: Disk quotas can be used to limit the amount of disk space or the number of files allocated...

Zimbra Server Status shows all failed services

Step by step guide to solve problem zimbra some services are not running the following: To fix this issue:Check...

How to stop bad bots from visiting your website

Recently I noticed in Google Analytics a lot of referral to the page https://www.mydomain-name.com//h/1486338.html that doesn’t exist on one of my website....

Cannot access disk on zfs, Don’t Panic!!

I was having an issue with one of my Proxmox 5.0 version. When I was trying to start my VM it states...

Set-Up Master-Slave Replication for PostgreSQL 9.6 on Ubuntu 16.04

What we will do: Install PostgreSQL 9.6.Configure MASTER Server.Configure SLAVE Server.Copy PostgreSQL Data from MASTER to SLAVE.Testing.

Zimbra XXE / SSRF Vulnerability Disclosure

At March 18, 2019 , Rene Ottom, Vice President Product eMail and Collaboration announced that The Zimbra Security team has been...

How To Install Elasticsearch, Logstash, and Kibana (Elastic Stack) on Ubuntu 16.04

Introduction The Elastic Stack — formerly known as the ELK Stack — is a collection...

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...

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...
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MySQL – Restore a Single Table from a FULL mysqldump file

Use the sed command on your bash shell to separate the data of the table that you want to restore. For example, if we want...

Physical Volume is using an old PV header

Situation When running the pvs command the following warning is displayed: 

MegaCLI CheatSheet (2)

Get raid controller log MegaCli64 -adpeventlog -getevents -f lsi-events.log -a0 -nolog Raid Controller and Drive Status

SSH Issue no kex alg

So what is happened? What’s causing it? Well, a modern operating system like Debian Jessie is packaged with OpenSSH 6.7 or newer ...