2023-10

1.Website data backup1-1.Backup under /var/www/html①Create backup script file# cd /var/www/system# vi backup_html.sh2.MySQL database backup①Create backup script file# cd /var/www/system# vi db_my_backup.sh3.Restore backup files under html①Store HTML backup files in "/ (root)" directory4.Restore Mysql backup file①Save the database backup file to any directory and（In the example, the directory is "/var/www/backup/db_bak".）Extracting data

chkrootkit Install①chkrootkit Download and installation# cd /usr/local/src# wget https://launchpad.net/chkrootkit/main/0.55/+download/chkrootkit-0.55.tar.gz# tar xvf chkrootkit-0.55.tar.gz➁Create /root/bin directory and move chkrootkit command to that dirLogwatch①Install# dnf install logwatch②Edit configuration file# cat /usr/share/logwatch/default.conf/logwatch.conf >> /etc/logwatch/conf/logwatch.conf# vi /etc/logwatch/conf/logwatch.confPer Line 45Set "MailTo = root" as a comment and set the email address you want to receive notifications to the line below it.#MailTo = rootMailTo = [Mail address]Per Line 79Set the level of detail for log notifications#Detail = LowDetail = High③Output Logwatch reports# logwatch --output stdout

Snort3 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.MiracleLinux8 does not have a Snort3 repository, so build, compile and install Snort3 from source code1. Advance preparation①Install required build tools and libraries

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.

1. Disable 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. If you build a server while browsing a website and it does not work as expected, it may be due to the fact that selinux is enabled. Therefore, do not forget to disable it after installation.You can disable it by doing the following

MiracleLinuxMIRACLE LINUX is a Japanese Linux distribution provided by Cybertrust Corporation.Development was started by Miracle Linux (now Cybertrust), a company established by Oracle Japan and NEC in June 2000 to ensure stable operation of the Oracle Database for business to enterprise use.It has been built as a RHEL base since Version 2.0 released in May 2001, and as a complete RHEL clone since Version 6.0 released in January 2012.The latest version is 8.8, released on October 05, 2023, but can be installed just like 8.4.MIRACLE LINUX, a well-known domestic RHEL clone, was initially a commercial OS with a paid license, but following the demise of CnetOS8, it was announced that it would be offered free of charge starting with the latest 8.4 version. Therefore, this OS is currently in the limelight as a candidate for migration from CentOS8.

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

1.Obtain an SSL certificate ( Let's Encrypt )Install the latest open ssl# dnf install openssl-devel1.1 advance preparation1.Package management system Snappy installedSince the SSL certificate issuing tool "certbot" of Let's Encrypt is recommended to be installed using "snap" after 2021, install Snapd first.(Can also be installed the traditional way with dnf or yum)2. Converting Apache to httpsInstall the following just in case# dnf -y install mod_ssl3. SSL/TLS (Let's Encrypt) settings on the mail server3.1 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.