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Ubuntu20.04_en

Ubuntu Server 20.04 : Anti-virus & mail server

1. Introduction of Clamav anti-virus software1.1 Install# apt install clamav clamav-daemonClamav-related configuration files are installed in the /etc/clamav/ folder1.2 Update your virus definitions# freshclamThe above command will update the virus definitions, but if you get the following error, change the log settings and run it again
2021.12.18
Ubuntu20.04_en
Ubuntu20.04_en

Ubuntu Server 20.04 : NTP , FTP , WEB server

2. Install the FTP server vsftpd①Install# apt install vsftpd②Open PORT 21 at UFW# ufw allow ftp# ufw reload③Configuration file changes3. Apache2 installationFirst allow port http:80 and port https:443 on UFW# ufw allow http# ufw allow https# ufw reload3.1 Install Apache 2
2021.12.17
Ubuntu20.04_en
Ubuntu20.04_en

Ubuntu Server 20.04 : SSH Service & Firewall

1. SSH service security settingsThe SSH service allows root user login by default.Since the root user already knows the username, if the password is known, he can log in to the server with administrator rights.1.1 Creating a general userIf you have created a general user during the installation of Ubuntu 20, this step is not necessary.If the only user created on the server is root, you will not be able to log in remotely via SSH, so if you have not created a user when you installed the OS, you will need to create one beforehand.To create a user, use the "useradd" command.The "-m" option is used to create a home directory and the "-p" option is used to specify a password.For example, to set "ubuntuuser" as the user account name and "123456" as the password, you would run
2021.12.17
Ubuntu20.04_en
Ubuntu20.04_en

Ubuntu Server : 20.04 Initial setup

1. Set the root password and use the SU commandIn the default Ubuntu configuration, the root user is disabled because no password is set.By setting a password for the root user, the traditional [su] command can be used for transitions$ sudo passwd root[sudo] password for ← Current user's passwordEnter new UNIX password: ← Enter the root user password to be setRetype new UNIX password: ← Enter your password againpasswd: password updated successfullySwitch to root user$ su -Password:2. Modernisation of the system
2021.12.16
Ubuntu20.04_en
Ubuntu20.04_en

Ubuntu Server 20.04 : Obtaining and installing an image

Download Ubuntu Server 20.04 installation imageThe Ubuntu Server installation image can be downloaded from the official website.You will need to create an installation CD/DVD from the downloaded iso file.(About 1.2G)If you are installing on a virtual machine using Vmware or similar, you can use the iso file itself.Download the iso file   :  Ubuntu official download siteUbuntu Server 20.04 installationChange the BIOS so that the PC can boot from the installation disc created above, and then boot the PC.
2021.12.16
Ubuntu20.04_en
Ubuntu22.04_en

Ubuntu22.04 Server : Backup and Restore

1. System Backup1.1 Backup under /var/www/html①Create /var/www/system directory# mkdir -p /var/www/system②/Create backup_all.sh script under var/www/system# vi /var/www/system/backup_all.shbackup_all.sh script contents
2022.05.24
Ubuntu22.04_en
Ubuntu22.04_en

Ubuntu22.04 Server : Logwatch , Disk usage check

1. DiCE  InstallWhenever the global IP changes, which happens when the network is disconnected or the router is disconnected and rebooted, the dynamic DNS must be accessed to inform the user that the global IP has changed. DiCE does this automatically!
2022.05.23
Ubuntu22.04_en
Ubuntu22.04_en

Ubuntu22.04 Server : SNORT , Tripwire

1.SNORT InstallSnort 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.
2022.05.22
Ubuntu22.04_en
Ubuntu22.04_en

Ubuntu22.04 Server : MySQL 8 , WordPress

1. MySQL 8 Install1. 1Install# apt -y install mysql-server1.2. MySQL Server Security SettingsRun the tool mysql_secure_installation to configure security-related settings for the MySQL server.Once executed, several security settings are initiated in the form of questions.First, you will be asked if you want to use a plugin for password validation as follows. Password validation is a way to check the strength of a user's password for MySQL and restrict it to only accepting passwords that are secure enough. For example, it must be at least as many characters long as the user's password and must contain at least one symbol and one number. You can set this requirement by asking the following questionsType y and press Enter if you like
2022.05.22
Ubuntu22.04_en
Ubuntu22.04_en

Ubuntu22.04 Server : Let's Encrypt , Apache・Mail SSL

1. Certificate Acquisition (Let's Encrypt)1.1 advance preparation①Enable mod_ssl# a2enmod ssl②Install client tool to obtain Let's Encrypt certificate# apt -y install certbot③Obtaining CertificatesIt is assumed that a web server such as Apache httpd or Nginx is running.If the Web server is not running on the server, perform step ④.It is also assumed that the server on which the work is to be performed (the server with the FQDN from which the certificate is to be obtained) is accessible from the Internet at port 80.
2022.05.21
Ubuntu22.04_en
Ubuntu22.04_en

Ubuntu22.04 Server : Anti-virus　,　Mail Server

1.Introduced Clamav antivirus software1.1 Install# apt install clamav clamav-daemonThe clamav-related configuration files are installed in the /etc/clamav/ folder.1.2 Virus Definition Update# systemctl stop clamav-freshclam # freshclam
2022.05.20
Ubuntu22.04_en
Ubuntu22.04_en

Ubuntu Server 22.04 : WEB Server(Apache)

Apache2 installation.Allow http:80 port and https:443 port in UFW first.# ufw allow http# ufw allow https# ufw reload1 Install Apache2# apt -y install apache22 Apache2 Basic Settings
2022.05.18
Ubuntu22.04_en
Ubuntu22.04_en

Ubuntu Server 22.04 : NTP , FTP Server(Vsftpd)

1. Install a time synchronization service NTP server# apt -y install chrony# vi /etc/chrony/chrony.conf# Lines 20-23.：Comment the default settings and add the NTP server for your time zone.#pool ntp.ubuntu.com     iburst maxsources 4#pool 0.ubuntu.pool.ntp.org iburst maxsources 1#pool 1.ubuntu.pool.ntp.org iburst maxsources 1#pool 2.ubuntu.pool.ntp.org iburst maxsources 2
2022.05.18
Ubuntu22.04_en
Ubuntu22.04_en

Ubuntu Server 22.04 : SSH public key cryptosystem

SSH connection with authentication using RSA public key cryptographyCreation of public and private key pairsCreate a public/private key pair for a user connecting to a Linux server using OpenSSH.Use ssh-keygen to create key pairs.This time, we will create a key set using the RSA cipher used in the SSH protocol Version 2.Creation of public/private key pairs is performed with remote login user privileges (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.
2022.05.18
Ubuntu22.04_en
Ubuntu22.04_en

Ubuntu Server 22.04 :　SSH , Firewall

1. SSH Service Security SettingsThe SSH service allows root user login by default.The root user can log in to the server with administrator privileges if the password is known because the user name is already known.1.1 Creating a General UserIf you have created a general user when installing Ubuntu 22, this procedure is not necessary.If the only user created on the server is root, remote login via SSH will not be possible, so if a user has not been created during OS installation, a user must be created in advance.
2022.05.18
Ubuntu22.04_en
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