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SaaS vs PaaS vs IaaS: What’s The Difference

The cloud is a hot topic for small businesses all the way to global enterprises, but remains a broad concept that covers...

Proxmox 6.0 Bug, hung kernel and how to fix it.

We have been running Proxmox 6.0 in some servers and after a few weeks, they were having a hung issue. one-by-one all...

How to enable write cache for 3ware Raid controller

You can check the current cache status and then enable or disable it using the 3ware command line utility tw_cli. First lets see how...

Delete OLD data from Zabbix database

If you are using Zabbix for a long time, then you might notice that the database size of Zabbix is increasing every day. Then...

HTTP/2 Vulnerabilities in Nginx

In August 2019, NGINX Updates Mitigate in many implementations of HTTP/2. NGINX and Cloudflare are aware in this Mandatory case, Fortunately, For...

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...

Disable MySQL Strict Mode

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

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...

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...

Bash For Loop Examples

for loop syntax How do I use bash for loop to repeat certain task...

Vim Cheat Sheet

Global :help keyword – open help for keyword:saveas file – save file as:close – close current paneK – open man page for word under the cursor

The 3 Pillars of Email Authentication: SPF, DKIM, DMARC

If you’re an email marketer or maybe troubleshooting with email issue, you’ve probably heard acronyms like “SPF,”...
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Most Read

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...