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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...

Ubuntu updates for TCP SACK Panic vulnerabilities

14.04 , 16.04 , 18.04 , ESM , Extended Security Maintenance , livepatch , sack panic , Security , TCP Sack Panic , Trusty Tahr Issues have been identified in the way the Linux kernel’s TCP implementation...

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...

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.

Security Advisory – TCP SACK PANIC – Kernel vulnerabilities – CVE-2019-11477, CVE-2019-11478 & CVE-2019-11479

Redhat Ubuntu reference:https://access.redhat.com/security/vulnerabilities/tcpsackhttps://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-11477.htmlhttps://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md Primarily Impacted Products Red Hat...

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...

Active-Active vs Active-Passive High Availability Cluster

Overview The two most commonly used high availability (HA) cluster configurations are active-active and active-passive. What’s the difference between...

Disable MySQL Strict Mode

This is enabled by default, but you can disable it in one of a couple ways.

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.
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MegaCLI CheatSheet

How to show all LSI RAID info with MegaCLI: Show basic configuration: /opt/MegaRAID/MegaCli/MegaCli64 -LDInfo -Lall -aAll

Proxmox 5x “e1000 driver hang” fix

Problem: I started to experience proxmox servers going up and down, an intermittent response on the network (SSH),...

How To Fix “Device eth0 does not seem to be present, delaying initialization” Error on Centos

check network: # ifconfig lo        Link encap:Local Loopback           inet addr:127.0.0.1  Mask:255.0.0.0           inet6 addr: ::1/128 Scope:Host           UP...

Create Blocking Bad Bots Through Apache in WHM/cPanel

we see a lot of traffic from 'bad robots', these bots cause problems such as high server load, server instability and can...