Categories

Centos5 (1)

Centos5 tips and tricks

Centos6 (2)

Centos6 tips and tricks

Curl (1)

Curl related articles

Articles

 CSF firewall Installation in Centos8

This article is about how to install CSF firewall and missing plugins. You can find a copy of a...

 Centos 8 to Centos 8 Stream migration

Update CentOS 8 to latest available version using command: $ sudo dnf update After updating the...

 Change default kernel in grub2 Centos

With newer systems like CentOS 7 and Ubuntu 14.04 and 16.04 using Grub2, you can no longer simply...

 Count the amount of inodes - files in a given directory

#!/bin/bash## @title inodes#...

 Docker failed with the error: Error response from daemon: error creating overlay mount to invalid argument

If you receive below  error when trying to configure a docker application: Docker failed with...

 ERROR Error: Type: 'systemctl_call_fail'

ERROR Error: Type: 'systemctl_call_fail' Whenever you encounter this error, it means...

 Fail2ban high memory usage

The initial fail2ban virtual memory overhead on the server was approximately 350MB.While that is...

 Fail2ban how to block unblock whitelist ip

fail2ban-client status Status|- Number of jail: 1`- Jail list: sshd This command will show the...

 Force reboot of a server

This commands enable sysrq and after this call fast reboot. echo 1 >...

 Force shutdown for a server

If you want to force shutdown machine try this.This command comes in handy if you get very...

 How To Migrate CentOS Linux To Oracle Linux

Oracle Linux is a RHEL-based Linux distribution developed by Oracle. It is one of the best...

 How to fix GPG key retrieval failed: [Errno 14]? yum install

It is often the case when you try to install a package that the gpg keys are changed or not...

 How to send logrotate logs over email using SSMTP

A few days ago I was looking at my server logs, my website logs are more than a year old and...

 Installing packages using pip and virtual environments

This guide discusses how to install packages using pip and a virtual environment manager:...

 Linux Execute Cron Job After System Reboot

I am on Red Hat Enterprise Linux server. Is there is an easy way to run script or command at boot...

 Systemd Failed to get properties Activation of org.freedesktop.systemd1 timed out ssh

The issue is related to a bug in systemd that is causing systemd to timeout due to multiple...

 cve-2021-3156 vulnerability

Qualys Security Advisory Baron Samedit: Heap-based buffer overflow in Sudo (CVE-2021-3156)...

 systemctl abandoned session error

If when running systemctl you see below error: session-12397946.scope loaded active abandoned...