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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...

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...

Disable MySQL Strict Mode

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

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,”...

March 13, 2019: End-of-Life for All TLS-SNI-01 Validation Support

Let’s Encrypt allows subscribers to validate domain control using any one of a few different validation methods....
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Tools for load-testing HTTP servers

Knowing how much traffic your web server can handle when under stress is essential for planning future grow of your website or...

Set Up Routing with ip Command in Linux

Can you explain the ip command to setup routing on Linux based systems? How do I use the ip command to configure the routing...

How to Kill MySQL Queries

MySQL queries can sometimes be long-running and may prevent transactions from accessing necessary tables to complete a...

Managing Journal Systemd Ubuntu

By default, systemd-journald ensures older journal records or journal files are deleted in order to keep a certain amount of disk space...