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CentOS9_en

CentOS Stream9 : Suricata , Tripwire , Chkrootkit

Suricata InstallSURICATA IDS/IPS is an open source IDS that ...
CentOS9_en

CentOS Stream9 : Logwatch , Disk Usage Check Script

1. Logwatch①Install②Edit configuration file③Output Logwatch ...
CentOS10_en

CentOS Stream10 : OS Install

This is a network server build with CentOS Stream 10, the up...
CentOS10_en

CentOS Stream10 : Initial setup after OS installation

1.Disabling SELinuxFirst, disable selinux. selinux is a feat...
CentOS10_en

CentOS Stream10 : SSH , Firewalld , NTP

1.Setting up remote connection via SSHSSH is a service for c...
CentOS10_en

CentOS Stream10 : Authenticated connection with SSH key pair

Authenticated connection with SSH key pairCreation of public...
CentOS10_en

CentOS Stream10 : FTP , Samba Server

1.FTP Server1. 1 vsftpd Install1.2 vsftpd settingSave the un...
CentOS10_en

CentOS Stream10 : Let's Encrypt , Apache・Mail Server SSL/TLS

1.Obtain SSL Certificate( Let's Encrypt )1.1 advance prepara...
CentOS10_en

CentOS Stream10 : MySQL8 , WordPress

Mysql8 Installcharset.cnf Create a new one with the followin...
OracleLinux 8.8_en

OracleLinux8.8 : OS Install

OracleLinux9.2Oracle Linux provides a 100% application binary compatible alternative to Red Hat Enterprise Linux and CentOS Linux for both hybrid and multi-cloud environments.Since 2006, Oracle Linux has been completely free to download and use. Source code, binaries and updates are provided free of charge. It is freely redistributable. Free for use in production environments.今回は、最新のOracle Linux9.2(2023年5月リリース)で進めていきます。This time, we will proceed with the latest Oracle Linux 9.1.(May 2023 Release)1.Oracle Linux9.2 DownloadOracle Linux 9.2 installation image (OracleLinux-R9-U2-x86_64-dvd.iso ) can be downloaded from the following sitehttps://www.oracle.com/linux/
OracleLinux 8.8_en

OracleLinux8.8 : Initial settings after OS installation

1.Install bash completion extension package# dnf -y install bash-completion# reboot2.Disabling SELinuxFirst, 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 contents of the configuration considerably.Therefore, it is basically a case of invalidation in many cases.SELinux operating modesEnforcing : 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
OracleLinux 8.8_en

OracleLinux8.8 : SSH Remote connection , Firewalld , NTP Server

1.Setting up a remote connection via SSHSSH is a service for connecting remotely to a server and is basically running immediately after the OS is installed, but the default settings are somewhat insecure.Here we will configure the default settings to increase the security of SSH connections.2.Firewall (Firewalld) settingsIn Oracle, the firewall is firewalld configured by default and enabled during OS installation.To briefly explain "firewalld," when setting communication control policies, communication permission/blocking rules are applied to predefined zones, and these zones are then assigned to each NIC (network adapter).
OracleLinux 8.8_en

OracleLinux8.8 : SSH connection with SSH key pair

SSH connection with authentication using public key Creation 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_ed25519.pub will be created in /home/(user name)/.ssh/. On the way, enter the password for the key.
OracleLinux 8.8_en

OracleLinux8.8 : FTP Server , Samba FileServer

1.FTP Server1.1vsftpd Install# dnf -y install vsftpd1.2vsftpd configurationSave the unedited vsftpd.conf with .bak# cp /etc/vsftpd/vsftpd.conf /home/huong/vsftpd.conf.bak2. vsftpd SSL/TLSConfigure Vsftpd to use SSL/TLS2.1 Create self-signed certificatesThis work is not required if you are using a trusted, legitimate certificate such as Let's Encryp3. File server installation with SambaBuild a file server with access rights that requires user authentication with Samba.Installation Procedure①Create shared folders with access rights that require user authentication②Accessible group creation③Creation of users belonging to accessible groups④Configuration File Edit
OracleLinux 8.8_en

OracleLinux8.8 : WEB Server (Apache)

1.Apache2 Install , Virtual Host Configuration1.1 Apache2 install2. Use of CGI Scripts①CGI availability check3. PHP installation and configuration4. Digest authentication with Apache2Since Basic Authentication, a well-known authentication authorization method for http, sends authentication information in plain text, there is a risk of ID and password leakage if the packet is intercepted.On the other hand, Digest Authentication encrypts and transmits authentication information, so there is almost no risk of information leakage.