Click here for "Error Codes for Commercial Air Conditioners".

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Fedora35 : Logwatch , DiCE

Logwatch Introduction ①Install # dnf install logwatch ②Edit configuration file # cat /usr/share/logwatch/default.conf/logwatch.conf >> /etc/logwatch/conf/logwatch.conf # vi /etc/logwatch/conf/logwatch.conf
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Fedora35 : Install

What is Fedora? Fedora is an open source operating system software, a Linux distribution. The project started as a successor to Red Hat Linux, whose development was terminated at the end of 2003. It is unique in that it is community-driven, proactively incorporates feedback from the field, and introduces advanced, flexible, and advanced features. The most obvious difference when compared to popular Linux distributions such as "Ubuntu" is the balance between "advanced" and "stable". However, its stability has now been greatly improved, and it is gaining a reputation as an OS that can be used regularly, not just for functional testing purposes. For those who want to incorporate new and useful features as soon as possible, Fedora will be the best choice. However, it should not be used as a production environment or corporate need. In this case, we will use the latest Fedora 35 Server, released November 02, 2021
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Fedora35 : System Backup & Restore

Web configuration file (under html) backup ①Create backup script file # cd /var/www/system/ # vi html_backup.sh Contents of html_backup.sh MySQL database backup ①Create backup script file Web configuration file (under html) restored ① Copy the HTML backup file to the "/ (root)" directory of the server to be used for restoration Restore MySQL data ① Save database backup file to any directory
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Fedora35 ; Let’s Encrypt , Apache Mail SSL

Obtain SSL Certificate (Let's Encrypt) Install the latest open ssl # dnf install openssl-devel 1.Certificate Installation # dnf -y install certbot # certbot certonly --webroot -w /var/www/html/[domain name] -d [domain name] # Registration of e-mail address and agreement to terms of use are required for the first time only. # Specify an email address to receive
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Fedora35 : Mysql8 , WordPress

Mysql8 installation #dnf module -y install mysql:8.0 #vi /etc/my.cnf.d/charset.cnf Create a new charset.cnf with the following contents # Set default character encoding # To handle 4-byte characters such as pictographs, use [utf8mb4]. [mysqld] character-set-server = utf8mb4 [client] default-character-set = utf8mb4
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Fedora35 : SNORT , Tripwire

SNORT Installation 1.advance preparation ①Add the CodeReady Red Hat repository and install the required software # dnf -y install bison flex libpcap-devel pcre-devel openssl-devel libdnet-devel libtirpc-devel libtool nghttp2 libnghttp2-devel # mkdir /var/src ②Installing DAQ # cd /var/src
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Fedora35 : Clam AntiVirus , Mail Server

Install Clamav ( anti-virus software ) 1.Install Clam AntiVirus # dnf -y install clamav clamd clamav-update 2.Edit Clam AntiVirus configuration file # vi /etc/clamd.d/scan.conf ●Line 14. # Default: disabled LogFile /var/log/clamd.scan ← Uncomment ●Line 77.
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Fedora35 : WEB Server

Apache2 installation and virtual host configuration 1.Apache2 installed ①Install httpd # dnf -y install httpd Version Check # httpd -v Server version: Apache/2.4.53 (Fedora Linux) Server built: Mar 17 2022 00:00:00
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Fedora35 : FTP Server(Vsftpd)

FTP Server Installation 1. Vsftpd installation # dnf -y install vsftpd 2.Vsftpd configuration Save the unedited vsftpd.conf with .bak # cp /etc/vsftpd/vsftpd.conf /home/huong/vsftpd.conf.bak ①Edit configuration file # vi /etc/vsftpd/vsftpd.conf ●Line 12: Anonymous login prohibited (confirmation)
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Fedora35 : Remote connection with SSH public key cryptography

SSH public key cipher setting Create an SSH private key on Windows and an SSH public key on the server to allow login by key pair authentication. 1.Create key pair with ECDSA Become an ordinary user and create a key pair in ECDSA # su – $ ssh-keygen -t ecdsa Generating public/private ecdsa key pair. Enter file in which to save the key (/home/huong/.ssh/id_ecdsa): Created directory '/home/huong/.ssh'. Enter passphrase (empty for no passphrase):  ← Enter any password
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Fedora35 : SSH , Firewall

1.Remote connection by SSH SSH is a service for connecting remotely to a server, basically running immediately after OS installation, but the default settings are somewhat insecure. Configure the default settings to increase the security of ssh connections. 1.1 SSH service configuration file changes The SSH service configuration file is "/etc/ssh/sshd_config". Open the configuration file in a vi editor. # vi /etc/ssh/sshd_config
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Fedora35 : Initialization

1. SELinux Disable First, disable selinux. selinux is a feature that improves auditing and security in Linux, but when enabled, it can limit the behavior of services and the configuration considerably. Therefore, it is basically invalidated in many cases. You can disable it by doing the following