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This lesson introduces the core concepts of AWS object storage. We will start by contrasting object storage (S3) with traditional block storage to understand its unique use cases in cloud applications, particularly for data analytics and backup. We will then define S3 buckets and objects, covering naming conventions and the concept of a flat namespace managed with prefixes. The second half of the lesson will focus on S3 Storage Classes, including S3 Standard, Standard-IA, One Zone-IA, and Intelligent-Tiering. We will analyze the trade-offs between cost, retrieval time, durability (the '11 nines'), and availability for each class, concluding with an introduction to Amazon S3 Glacier for long-term archival.
This lesson introduces AWS CloudTrail as the foundational service for auditing and governance. We will cover its core function of recording all user activity and API usage across an AWS account. The session will differentiate between the two main types of logged events: Management Events (control plane operations like creating an EC2 instance) and Data Events (high-volume, data-plane operations like S3 object access). We will explore the default 90-day Event History and then explain the necessity of creating a "Trail" to deliver immutable, long-term log files to an S3 bucket for security analysis and compliance. A key focus will be on the log file integrity validation feature, which ensures logs have not been tampered with. The lesson will conclude with a practical walkthrough of the CloudTrail console to view recent events.
This lesson introduces the fundamentals of Linux kernel security through direct interaction with kernel parameters. We will start by exploring the /proc pseudo-filesystem, understanding its structure and how it serves as a runtime interface to the kernel. Then, we will focus on the 'sysctl' utility to view and modify key security-related network parameters, such as those for disabling ICMP ping responses, enabling TCP SYN cookie protection against DoS attacks, and preventing IP spoofing with rp_filter. The session will include a practical exercise where you apply these settings, check their status, and make them permanent by creating a configuration file in /etc/sysctl.d/, mirroring a real-world hardening task.
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