nuy | Page 34 | Linux Server Construction

MiracleLinux9.0 : SSH Authenticated connection with key pair

SSH connection with authentication using public key cryptographyCreation of public and private key pairsCreate a public/private key pair for a user connecting to the Linux server using OpenSSH.Use ssh-keygen to create key pairs.Creation of public/private key pairs is performed with remote login user privileges.If you do not specify the destination and file name, id_ed25519 and id_eed25519.pub will be created in /home/(user name)/.ssh/. On the way, enter the password for the key.

2022.11.15

MiracleLinux9.0_en

MiracleLinux9.0 : SSH , Firewalld , NTP Server

1.Setting up SSH remote connectionSSH is a service to connect to a server remotely, and is basically running right after the OS installation, but the default settings are somewhat insecure.In this section, we will configure the settings to change the default settings and increase the security of the ssh connection.1.1 Change the configuration file of SSH service.The configuration file for the SSH service is "/etc/ssh/sshd_config". Open the configuration file with vi editor

2022.11.15

MiracleLinux9.0_en

MiracleLinux9.0 : Various settings after installation

1.Disabling SELinuxFirst, disable selinux. selinux is a feature that improves auditing and security in Linux, but when enabled, it places considerable restrictions on the behavior of services and on what can be configured. Therefore, it is basically disabled in many cases.SELinux Operation ModeEnforcing : SELinux functionality is enabled and access control is enabledPermissive : SElinux will warn, but no access restrictions will be placeddisabled : Both SElinux function and access control are disabled

2022.11.14

MiracleLinux9.0_en

MiracleLinux9.0 : OS Install

MiracleLinuxMIRACLE LINUX is a Japanese Linux distribution provided by Cybertrust Corporation.Miracle Linux (now Cybertrust), established by Oracle Japan and NEC in June 2000, began development of Oracle Database for business and enterprise use with the aim of ensuring stable operation.It has been based on RHEL since Version 2.0 released in May 2001, and has been a full RHEL clone since Version 6.0 released in January 2012, with the latest version being 8.4 as of December 2021.MIRACLE LINUX, the famous domestic RHEL clone, was initially a commercial OS with a paid license, but following the termination of CnetOS8, it was announced that it would be offered free of charge starting with the latest 8.4.The current distribution is Red Hat Enterprise Linux (RHEL) 9 compatible with the latest version 9.0 released on November 1, 2022.Like RHEL9, MIRACLE LINUX 9 is based on Linux kernel 5.14. In addition to version upgrades to major packages such as OpenSSL, MIRACLE LINUX 9 offers mainly enhanced security-related features such as improved SELinux performance and secure boot support.Package updates and security patches will be provided free of charge until November 2032.

2022.11.14

MiracleLinux9.0_en

Fedora36 : System Backup and Restore

Web configuration file (under html) backup①Create backup script file# cd /var/www/system/# vi html_backup.shContents of html_backup.shMySQL database backup①Create backup script fileWeb configuration file (under html) restored① Copy the HTML backup file to the "/ (root)" directory of the server to be used for restorationRestore MySQL data① Save database backup file to any directory

2022.10.20

fedora36_en

Fedora36 : Logwatch , DiCE Install

Logwatch Introduction①Install# dnf install logwatch②Edit configuration fileInstalling DiCEWhenever 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!①Download and install Dice

2022.10.19

fedora36_en

Fedora36 : SSL Certificate ( Let's Encrypt ) , Apache ・Mail Server SSL

1.Obtain SSL Certificate ( Let's Encrypt )Install the latest open ssl# dnf install openssl-devel2. Apache SSLInstall the following just in case# dnf -y install mod_ssl3.Mail SSL/TLS(Let's Encrypt)3.1 Obtaining a certificate for the mail serverObtain a certificate for the mail server, but it cannot be obtained in the same way as above, so the following with the "--standalone" option fails.

2022.10.19

fedora36_en

Fedora36 : SNORT2 , Tripwire Install

SNORT Installation1.advance preparation①Add 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/src②Installing DAQ# cd /var/srcTripwire Installation1.Install# dnf -y install tripwire

2022.10.18

fedora36_en

Fedora36 : Clam AntiVirus , Mail Server

Install Clamav ( anti-virus software )1.Install Clam AntiVirus# dnf -y install clamav clamd clamav-update2.Edit Clam AntiVirus configuration file# vi /etc/clamd.d/scan.confMail Server Install1. Install Postfix1.1 InstallInstall Postfix and build an SMTP serverMail Server : Postfix + Clamav + Amavisd+SpamAssassin1.Real-time scanning of E-mails①Install Amavisd and Clamav Server# dnf -y install amavisd-new clamd perl-Digest-SHA1 perl-IO-stringy

2022.10.17

fedora36_en

Fedora36 : WEB Server(Apache2) Install

Apache2 installation and virtual host configuration1.Apache2 Install①httpd install# dnf -y install httpdVersion Check# httpd -verver version: Apache/2.4.54 (Fedora Linux)Server built: Jun 17 2022 00:00:003.Virtual Host SettingsAssign and configure the [FQDN] to be operated on the virtual host in the document root [/var/www/html/FQDN] directoryConfirmation of CGI Script Usage①CGI availability checkPHP installation and configuration1.PHP Installation①Install# dnf -y install php php-mbstring php-pear

2022.10.17

fedora36_en

Fedora36 : FTP Server(Vsftpd) , File Server(Samba)

1.FTP Server Installation1. 1 Vsftpd Install# dnf -y install vsftpd1.2 Vsftpd configurationSave the unedited vsftpd.conf with .bak2. vsftpd SSL/TLSConfigure Vsftpd to use SSL/TLS2.1 Create self-signed certificates3. File server installation with SambaBuild a file server with access rights that requires user authentication with Samba.Installation Procedure① Create shared folders with access rights that require user authentication②Creation of accessible groups③Creation of users belonging to groups that can be accessed④Configuration File Editing

2022.10.17

fedora36_en

Fedora36 : Remote connection with SSH public key cryptography

SSH public key cipher settingCreate 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 ECDSABecome an ordinary user and create a key pair in ECDSA# su – $ ssh-keygen -t ecdsaGenerating 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

2022.10.16

fedora36_en

Fedora36 : SSH 、Firewalld

1.Remote connection by SSHSSH 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 changesThe SSH service configuration file is "/etc/ssh/sshd_config".Open the configuration file in a vi editor.# vi /etc/ssh/sshd_config

2022.10.16

fedora36_en

Fedora36 : Various settings after installation

1. SELinux DisableFirst, 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 following2. System modernization & Services suspended due to security measures3.Network Settings3.1 Set host nameSet the hostname to "Lepard" since the hostname was not set during OS installation.4.Install NTP server and set up time synchronization service4.1 Chrony Install5.Set server time zoneSet time zone to Japan (Tokyo)

2022.10.16

fedora36_en

Fedora36 : OS 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 36 Server, released May 10, 2022.

2022.10.16

fedora36_en