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Introduction to firewall concepts and the legacy `iptables` tool. This lesson covers the fundamentals of layered security, the role of the `netfilter` kernel framework, and the structure of `iptables` (tables, chains). The main activity will be to construct a basic, stateful IPv4 firewall script that allows loopback traffic, established and related connections, and opens the SSH port (22) to maintain server access.
This lesson covers the fundamental principles of secure administrative access. It begins by explaining the significant security risks associated with direct root user logins, such as lack of accountability and high potential for accidental system-wide errors. It then introduces 'sudo' as the standard, more secure alternative, highlighting its key benefits: detailed command logging for auditing, the ability to grant granular privileges based on the Principle of Least Privilege, and simplified administration. The lesson will cover the practical steps for setting up initial sudo privileges by adding a user to the 'sudo' (Debian/Ubuntu) or 'wheel' (Red Hat/CentOS) administrative groups.
This lesson introduces the core processes for building and deploying cloud-native applications, focusing on the architect's role. We will start with an overview of the Software Development Lifecycle (SDLC) phases (Analysis, Design, Development, etc.) to establish a foundational understanding. The main focus will be on modern Continuous Integration/Continuous Delivery (CI/CD) practices. We will cover the business drivers for CI/CD, such as accelerating feature delivery and improving reliability. Key technical components of a CI/CD pipeline will be analyzed, including version control systems (like Git), secure secrets management (e.g., Google's Secret Manager), and automated build/test/deployment tools (e.g., Google Cloud Build). The concept of GitOps will be introduced as a declarative approach to infrastructure and application management.
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