CentOS

Nowadays it is very easy to make DDOS attacks easily at cheap costs. In this respect, we will explain the installation and configuration of inetbase DDoS which provides blocking with inetbasefor a certain number of requests on your virtual servers with centos (if it is apf, it can also be blocked).

Of course, this inetbasecannot block large attacks, but it can block specific requests for your IP with inetbase.

You can install inetbase in all VPS packages in this article!

Finding multiple connections to your server over an IP can always be useful. In many cases, when you receive a DDOS attack, you will see multiple connections over an IP. A command that can be very useful, especially in such a case. For example, you want to list IPs that open more than 50 connections on your server. In this case, you can use the following code;

netstat -n --tcp --udp --numeric-hosts | \
grep -v 127.0.0.1 | \
awk '{if (/(tcp|udp)/) { print $5 }}' | \
sed 's/:.*//' | \
sort | \
uniq -c | \
sort -n | \
awk '{if ($1 > 50) {print "Baglanti Sayisi: "$1"\t"$2; }}'

When you execute the command, you receive an output similar to the following; (Of course, if more than 50 connections are available from a single IP)

By installing ClamAV anti-virus on the server, you can scan for viruses on your server. Below we will try to explain how to install and scan.

Since there is no ClamAV in the standard CentOS libraries, let’s start by adding the EPEL repo to CentOS as the best way;

yum install epel-release -y

Then, with the command below, ClamAV anti-virus and Clamav Clamd Deamon is installed;

yum install clamav clamd

With the following commands, we set Clamd to start automatically with the system and start it;

Today, we will set up a proxy for the Zabbix server that I have installed in version 3.4 and enable it to communicate.

First things you need to do;

1- IP configuration

2- Turning off selinux and firewall settings

3-C hange hostname (optional, easy to manage large structures)

4- Passing updates.

If the server is ready after the steps mentioned above;

We enter the Zabbix official repo and download the required rpm package.

In my previous article, I wrote about Learning Windows Installation History. On the Windows side with a command can learn it, Linux operating systems, we can not learn it with command. However, we can access the installation information from the date of creation of the files or directories that were created when installing Linux operating systems and then never changed.

To do this, run the following commands on the console.