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Tag - RHEL

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Ip6tables Firewall Recommended Configuration on Redhat or CentOS Linux

by Free Linux
2 min read
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Ip6tables is a firewall utility that uses policy chains to allow or block traffic.  It can configure IPv6 tables, chains or rules provided by the Linux kernel firewall. Some key things to consider: 1. Installation: (When...

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  • Tutorials

Uncomplicated Firewall (UFW) Recommended Configuration on Redhat or CentOS Linux

by Free Linux
3 min read
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Uncomplicated Firewall (UFW) -frontend for iptables and is a program for managing a netfilter firewall. Some key things to consider: 1. Installation: dnf install epel-release -y dnf install ufw -y 2. Verify if ufw is...

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  • Tutorials

Top 15 Services to Remove for Securing Redhat or CentOS Linux

by Free Linux
7 min read
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As part of the Best Security Practices, it is recommended to disable all services that are not required for normal operation to prevent the vulnerabilities exploitation of these services for Redhat Enterprise Linux (RHEL) or...

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  • Tutorials

Installing IDS using Snort with OinkMaster, Barnyard and BASE on RHEL/CentOS 64-bit

by tux
8 min read
6 Comments

Snort® is an open source network intrusion prevention and detection system (IDS/IPS) developed by Sourcefire. Other definitions: – Barnyard is an output system for Snort. Snort creates a special binary output format called...

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  • Quick Tips & Tricks

Configure Postfix to use Gmail in RHEL/CentOS

by tux
3 min read
26 Comments

Relaying to Gmail via smtp.gmail.com can be accomplished by configuring your Postfix with SASL authentication and TLS encryption. The common errors you will encounter if sending from your postfix mail server failing to gmail.com...

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  • Tutorials

Full & Incremental MySQL Backup via Mysql-ZRM

by tux
5 min read
2 Comments

mysql-zrm is short for Zmanda Recovery Manager for MySQL. It lets you create full logical or raw backups of your databases , generate reports about the backups, verify the integrity of the backups, and recover your databases. It...

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  • Quick Tips & Tricks

Configure Sendmail for SMTP Authentication

by tux
4 min read
12 Comments

1. Wonder why you can’t send email from your linux server? 2. Is your mail server or 3rd party email hosting provider requires authentication for your outgoing server to send out emails successfully? 3. Are you using a...

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  • Quick Tips & Tricks

Backup Server files and MySQL database via FTP

by tux
3 min read
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I had the chance to work as a systems administrator in an e-commerce company and they have Linux dedicated servers leased/purchase from a hosting provider. Dedicated servers compared to a shared hosting is you have full control...

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  • Tutorials

Linux as a Router and Firewall

by tux
6 min read
3 Comments

Step by Step Procedure Step 1. Add 2 LAN cards to the Linux box. You need to have two(2) NICs, one for your private network and one for the public IP address Step 2. Check if your networks cards are properly detected and...

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  • Tutorials

Setting up FTP server via VSFTPD

by tux
3 min read
5 Comments

* Setting up ftp via vsftpd in linux The VSFTPD (Very Secure FTP Server Deamon) is one of the most commonly used FTP servers under Linux and comes with most Linux distributions. This article will help you install and configure...

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