Jun 3, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Table of Contents Introduction Understanding Modern Email Attacks Initial iRedMail Security Review Postfix Hardening Dovecot Security Firewall Strategy Advanced Fail2Ban Configuration Automated Subnet Blocking for Mail Services Roundcube Webmail Security Monitoring...
Jun 3, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Table of Contents Introduction Initial Server Hardening SSH Security Firewall Configuration Fail2Ban Setup Automated Subnet Blocking KVM-Specific Security Monitoring and Maintenance Conclusion Introduction Running a KVM host server with multiple virtual machines...
Jun 2, 2026 | Advanced Linux Scripting, Learn Linux in practical way
KVM virtual machines won’t start with “cannot execute binary /usr/bin/swtpm: Permission denied”? Learn how to fix SELinux blocking swtpm (TPM emulator) in 5 minutes. Complete guide with multiple solutions. You’ve just rebooted your KVM host...
Jun 2, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Postfix postscreen failing with “error: open database …lmdb: No such file or directory”? Learn why this happens and how to fix it permanently in 2 minutes. Complete guide with scripts. You’ve just fixed the Postfix hash: to lmdb: conversion, but now...
Jun 2, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Upgraded to Rocky Linux 10 and Postfix is failing with “unsupported dictionary type: hash”? Learn how to convert hash maps to LMDB in 5 minutes. Complete guide with scripts. You’ve just upgraded your mail server to Rocky Linux 10. Everything seemed...
Jun 2, 2026 | Advanced Linux Scripting, Learn Linux in practical way
Introduction Running a KVM host with multiple VMs requires careful security configuration. This guide documents real-world challenges including network instability, firewall issues, and a tricky dual-NIC routing problem on a mail server VM. Part 1: Initial Server...
