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CentOS

How To Install IPtables On CentOS 8/7 RHEL 8/7

August 24, 2022arstech Leave a Comment
How To Install IPtables On CentOS 8/7

In this article, you will learn How To Install IPtables On CentOS 8/7 RHEL 8/7. FirewallD provides a dynamically managed firewall with support for network/firewall zones that define the trust level of network connections or interfaces. Starting from CentOS 7,… Continue Reading →

CentOS, Linux centos, iptables, RHEL

[SOLVED] Error: Failed to download metadata for repo ‘appstream’ – CentOS 8

August 23, 2022arstech Leave a Comment
Error Failed to download metadata for repo appstream

In this article you will learn how to fix Error: Failed to download metadata for repo ‘appstream’: Cannot prepare internal mirrorlist: No URLs in mirrorlist. If you try update CentOS 8 with dnf update or yum update commands you will… Continue Reading →

CentOS, Linux CentOS 8, DNF, yum

[SOLVED] How to fix error: GPT PMBR size mismatch

April 21, 2022arstech Leave a Comment
GPT PMBR size mismatch

In this article you will learn how to fix the Linux error: GPT PMBR size mismatch will be corrected by write after executing fdisk command. The problem can happen when the partition table was set up for a smaller disk… Continue Reading →

CentOS, Linux, Ubuntu fdisk, Linux, parted, Ubuntu

How To Resize Linux Partition Using Command Line

April 21, 2022arstech Leave a Comment
Resize Linux Partition Command Line

In this article you will learn how to resize Linux partition from Command Line on virtual machine (VMware, Proxmox, AWS, ..). Тhis example is applicable for increase only for NON LVM partitions. In our example we will use Debian, but… Continue Reading →

CentOS, Linux, Ubuntu centos, fdisk, Linux, resize2fs, Ubuntu

How To Check Ethernet Connection Speed in Linux

December 2, 2021arstech Leave a Comment
Check Ethernet Connection Speed in Linux

In this article I will show How To Check Ethernet Connection Speed in Linux using 3 different ways. Ethtool Show Speed ethtool is powerful utility for query or control network driver and hardware settings for wired Ethernet devices. To determine… Continue Reading →

CentOS, Linux, Ubuntu Connection Speed, eth, Ethernet, ethtool command, link speed

[Solved] How to fix “Error: Let’s Encrypt validation status 400”

November 2, 2021arstech Leave a Comment
Let's Encrypt validation status 400

While trying add new WEB domain with SSL support or installing Let’s Encrypt SSL Certificate in Vesta / Hestia / MyVesta Control Panel yo may have receive an error “Error: Let’s Encrypt validation status 400”. That’s It! Discuss this topic… Continue Reading →

CentOS, Linux, Ubuntu Hestia, myvesta, vesta control panel, vestacp

How to Securely Wipe Hard Drive in Linux

October 18, 2021arstech Leave a Comment
Securely Wipe Hard Drive in Linux

In this article you will learn how to securely wipe hard drive Linux, also how to securely delete files in Linux. First you need found correct disk path to hard drive which you want securely wipe, list hard drives in… Continue Reading →

CentOS, Linux, Ubuntu Hard drive, Linux, scrub, Wipe

[SOLVED] Fail2ban High Memory Usage

October 13, 2021arstech Leave a Comment
fail2ban

In this article you will learn a couple of methods on how to fix Fail2ban High Memory Usage problem. There may be several reasons for Fail2ban consumption a very large amount of memory (in my case it was about 2,5… Continue Reading →

CentOS, Linux, Ubuntu Fail2ban, Memory, SQLite

Fix Zabbix Warning: Lack of Free Swap Space

September 7, 2021arstech Leave a Comment
Lack of Free Swap Space

In this article you will learn how to Fix Zabbix Warning: Lack of Free Swap Space, and manually clear swap memory in Linux. The problem has 3 solutions, create or increase swap space, increase server RAM, and finally we can… Continue Reading →

CentOS, Linux, Ubuntu Linux, Swap, Zabbix

How to Install NTP Server On CentOS 8 /RHEL

June 25, 2021arstech Leave a Comment
Install NTP Server CentOS 8

In this tutorial we will learn: How To Install NTP Server On CentOS 8 / CentOS 7 (CHRONY SUITE) How to configure Chrony as NTP server Introduction to the Chrony Suite Chrony is an implementation of the Network Time Protocol… Continue Reading →

CentOS, Linux CentOS 8, Chrony, NTP server, ntpd

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