Linux and DevOps

📂 Full description Red Hat Enterprise Linux is one of the top enterprise Linux distributions. In this complete guide, Grant McWilliams—consultant, speaker, writer, professor, and developer—introduces you to IPv6 networking, link aggregation and static routing. Grant covers advanced system authentication using LDAP and secures it with Kerberos. Using Apache, he creates secure virtual hosts using TLS security and access control. To provide name service resolution, Grant creates a DNS server using bind and troubleshoots client issues. He dives into network file sharing using both NFS and Samba, as well as securing the latter with Kerberos. Grant also uses SSH to provide security for both the host and users. Plus, he synchronizes the system time with NTP and discusses how to manage MariaDB, including backing up and restoring databases.

🔅 Complete Guide to Red Hat Enterprise Linux 9 🌐 Author: Grant McWilliams 🔰 Level: Intermediate ⏰ Duration: 8h 6m

🌀 Get a complete guide to configuring and administering Red Hat Enterprise Linux, one of the top enterprise Linux distributions.

📗 Topics: Red Hat Enterprise Linux 📤 Join Linux and DevOps for more courses

🔰 Understanding Linux System Logs

System logs, often found in /var/log directory in Linux systems, are essential for monitoring and troubleshooting system issues. Here are short notes on some common system logs:

syslog: A general-purpose system log file that contains messages from various system services and applications. It's the main log file that many other logs feed into. auth.log: Records authentication-related messages, including successful and failed login attempts, password changes, and user authentication events. kern.log: Logs kernel-related messages, such as hardware errors, kernel module loading, and other kernel activities. messages: A catch-all log file that records various system messages, including system startups, shutdowns, and general system-related events. dmesg: Displays kernel ring buffer messages, providing a real-time view of kernel-related events and hardware detection during system boot-up. cron: Logs messages related to cron jobs and scheduled tasks, including when they run, and any errors encountered during execution. secure: Records security-related messages, including authentication attempts, privilege escalation, and other security-related events. apache/access.log and apache/error.log: These logs are specific to the Apache web server. access.log records HTTP access logs, while error.log logs Apache server errors and warnings. nginx/access.log and nginx/error.log: Similar to Apache logs, these logs are specific to the Nginx web server and record access and error events. mysql/error.log: Records errors and warnings encountered by the MySQL database server, including startup errors, query failures, and database crashes.

These logs provide valuable insights into system performance, security events, and troubleshooting information. Regularly monitoring and analyzing these logs can help maintain system health and identify potential issues before they escalate

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🔰 Linux Uncomplicated Firewall (ufw) essentials

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📚 Linux Crash Course - Managing Swap Space Imagine your system has only 2GB of RAM, but an application requires 3GB. Without swap space, this process would fail or crash because there isn’t enough memory available. With swap, however, the OS can shift inactive data into this overflow area, making room for the application. In this way, swap acts as a safety net, allowing the system to handle memory-heavy tasks smoothly even when RAM is limited. While swap space isn't as fast as physical RAM, it can be a lifesaver in those situations.

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