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	<title>Debian11.3_en | Linux Server Construction</title>
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	<lastBuildDate>Thu, 20 Nov 2025 23:44:42 +0000</lastBuildDate>
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	<title>Debian11.3_en | Linux Server Construction</title>
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	<item>
		<title>Debian11.3 : OS  Install</title>
		<link>https://korodes.com/en/debian11_en_01/</link>
		
		<dc:creator><![CDATA[nuy]]></dc:creator>
		<pubDate>Thu, 26 May 2022 23:33:59 +0000</pubDate>
				<category><![CDATA[Debian11.3_en]]></category>
		<guid isPermaLink="false">https://korodes.com/?p=7517</guid>

					<description><![CDATA[1.Debian11 Overview

In this article, we will explain how to build a server with Debian, the basis of the user-friendly Linux distribution UBUNTU.

The latest release is Debian 11.3 (codenamed "bullseye").
Released on August 14, 2021 with an update (point release) on March 26, 2022.

2.Download Debian installation image

Debian11 download site https://www.debian.org/

Access the above official website and download "debian-11.3.0-amd64-netinst.iso." which is convenient for setup in an environment connected to the Internet.（Fits on a single CD）
NETINST allows you to download and install the necessary packages from the Internet, so you can use a smaller installer (approximately 378 MB for v11.3.0) than a full installer.
Click through the following screens in order.]]></description>
		
		
		
			</item>
		<item>
		<title>Debian11.3 : System Backup and Restore</title>
		<link>https://korodes.com/en/debian11_en_12/</link>
		
		<dc:creator><![CDATA[nuy]]></dc:creator>
		<pubDate>Wed, 01 Jun 2022 08:09:10 +0000</pubDate>
				<category><![CDATA[Debian11.3_en]]></category>
		<guid isPermaLink="false">https://korodes.com/?p=7693</guid>

					<description><![CDATA[1.1 Backup under /var/www/html

①　Create backup_all.sh script under /opt

# vi /opt/backup_all.sh

backup_all.sh script contents
1.2 Mysql database backup

①Create db_backup.sh script under /opt

# vi /opt/db_backup.sh

db_backup.sh script contents
2.1 Restore backup files under HTML

① Store HTML backup files used for backup in the "/ (root)" directory
Select the backup file with the latest timestamp (e.g. www_back_20220501.tar.gz)
2.2 Restore MySQL database

①Save DB backup file to any directory and extract data

# cd /var/www/backup/db_bak]]></description>
		
		
		
			</item>
		<item>
		<title>Debian11.3 : Disk Usage Check、Logwatch</title>
		<link>https://korodes.com/en/debian11_en_11/</link>
		
		<dc:creator><![CDATA[nuy]]></dc:creator>
		<pubDate>Wed, 01 Jun 2022 07:47:17 +0000</pubDate>
				<category><![CDATA[Debian11.3_en]]></category>
		<guid isPermaLink="false">https://korodes.com/?p=7688</guid>

					<description><![CDATA[1. Introduce disk usage check script
1.1 Scripting
# cd /opt/script/
# vi disk_capacity_check.sh
Contents of disk_capacity_check.sh

#!/bin/bash

#Email Address for Notification
MAIL="<your mailaddress> "
2. Log analysis tool logwatch installed
2.1 Install logwatch
# apt -y install logwatch
2.2 Edit logwatch configuration file

①Copy the default configuration file]]></description>
		
		
		
			</item>
		<item>
		<title>Debian11.3 : SNORT2 , Tripwire Install</title>
		<link>https://korodes.com/en/debian11_en_10/</link>
		
		<dc:creator><![CDATA[nuy]]></dc:creator>
		<pubDate>Mon, 30 May 2022 08:37:04 +0000</pubDate>
				<category><![CDATA[Debian11.3_en]]></category>
		<guid isPermaLink="false">https://korodes.com/?p=7671</guid>

					<description><![CDATA[1.Install SNORT

Snort is an open source network intrusion detection system capable of performing real-time traffic analysis and packet logging on IP networks.

It can perform "protocol analysis," "content search," and "matching," and can be used to detect a variety of attacks, including "buffer overflows," "stealth port scans," "CGI attacks," "SMB probes," "OS fingerprinting attempts," "semantic URL attacks," and "server message block probes.]]></description>
		
		
		
			</item>
		<item>
		<title>Debian11.3 : MySQL8 , WordPress Install</title>
		<link>https://korodes.com/en/debian11_en_09/</link>
		
		<dc:creator><![CDATA[nuy]]></dc:creator>
		<pubDate>Mon, 30 May 2022 00:53:55 +0000</pubDate>
				<category><![CDATA[Debian11.3_en]]></category>
		<guid isPermaLink="false">https://korodes.com/?p=7612</guid>

					<description><![CDATA[1. Install MySQL 8
1. 1 Install

The MySQL team provides the official MySQL PPA for Debian Linux. After downloading and installing the package on your Debian system, the PPA file will be added to your system. To enable the PPA, run the following command
2.Install WordPress
2.1 Database Creation

Create a database for Word Press (for example, in this case, the database name is "wp_db", the user name is "wp_user", and the password is "?Y123456y")
If you receive a message "Your password does not satisfy the current policy requirements" when creating an account, please make sure your password is at least 8 characters long and includes upper and lower case letters, numbers, symbols, etc.]]></description>
		
		
		
			</item>
		<item>
		<title>Debian11.3 : Let&#039;s Encrypt   WEB , Mail Server  SSL</title>
		<link>https://korodes.com/en/debian11_en_08/</link>
		
		<dc:creator><![CDATA[nuy]]></dc:creator>
		<pubDate>Sun, 29 May 2022 10:08:51 +0000</pubDate>
				<category><![CDATA[Debian11.3_en]]></category>
		<guid isPermaLink="false">https://korodes.com/?p=7615</guid>

					<description><![CDATA[1. Obtain a certificate (Let's Encrypt)
1.1 advance preparation

①Enable mod_ssl

# a2enmod ssl

②Install client tool to obtain Let's Encrypt certificate

# apt -y install certbot]]></description>
		
		
		
			</item>
		<item>
		<title>Debian11.3 : Anti-virus , Mail server</title>
		<link>https://korodes.com/en/debian11_en_07/</link>
		
		<dc:creator><![CDATA[nuy]]></dc:creator>
		<pubDate>Sat, 28 May 2022 07:03:01 +0000</pubDate>
				<category><![CDATA[Debian11.3_en]]></category>
		<guid isPermaLink="false">https://korodes.com/?p=7595</guid>

					<description><![CDATA[1. Antivirus software Clamav installed

Install Clam AntiVirus, a free anti-virus software for Linux, as an anti-virus measure.
By installing this anti-virus software, you can not only scan the entire server for viruses, but also scan incoming and outgoing mail for viruses if you build and configure a mail server.]]></description>
		
		
		
			</item>
		<item>
		<title>Debian11.3 : WEB Server Apache  Install</title>
		<link>https://korodes.com/en/debian11_en_06/</link>
		
		<dc:creator><![CDATA[nuy]]></dc:creator>
		<pubDate>Sat, 28 May 2022 04:57:12 +0000</pubDate>
				<category><![CDATA[Debian11.3_en]]></category>
		<guid isPermaLink="false">https://korodes.com/?p=7582</guid>

					<description><![CDATA[Web server Apache2 installation Allow http:80 and https:443 ports in UFW before installation 1 Apache2 Install [&#8230;]]]></description>
		
		
		
			</item>
		<item>
		<title>Debian11.3 : NTP , FTP(Vsftpd)  install</title>
		<link>https://korodes.com/en/debian11_en_05/</link>
		
		<dc:creator><![CDATA[nuy]]></dc:creator>
		<pubDate>Sat, 28 May 2022 00:14:13 +0000</pubDate>
				<category><![CDATA[Debian11.3_en]]></category>
		<guid isPermaLink="false">https://korodes.com/?p=7575</guid>

					<description><![CDATA[1. Install NTP server
# apt -y install chrony
# vi /etc/chrony/chrony.conf
# Line 8.：Comment the default settings and add the NTP server for your time zone.
#pool 2.debian.pool.ntp.org iburst
pool ntp.nict.jp iburst
# Add to the last line (Range for which time synchronization is allowed)]]></description>
		
		
		
			</item>
		<item>
		<title>Debian11.3 : SSH public key cryptosystem</title>
		<link>https://korodes.com/en/debian11_en_04/</link>
		
		<dc:creator><![CDATA[nuy]]></dc:creator>
		<pubDate>Fri, 27 May 2022 23:04:34 +0000</pubDate>
				<category><![CDATA[Debian11.3_en]]></category>
		<guid isPermaLink="false">https://korodes.com/?p=7568</guid>

					<description><![CDATA[RSA SSH connection with authentication using public key cryptography
Create public and private key pairs

Create a public/private key pair for a user connecting to a Linux server using OpenSSH.
Use ssh-keygen to create the key pair.
This time, we will create a key set using the RSA cipher used in the SSH protocol Version 2.
The creation of a public/private key pair is performed with remote login user privileges (e.g., huong).
If you do not specify the destination and file name, id_rsa and id_rsa.pub will be created in /home/huong/.ssh/. On the way, enter the password for the key.]]></description>
		
		
		
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