https://wid-blog.github.io/en/posts/tech/infra/Recent content in Infra on wid's blogHugoenSat, 01 Nov 2025 00:00:00 +0000https://wid-blog.github.io/en/posts/tech/infra/vpc-security-fundamentals/Sat, 01 Nov 2025 00:00:00 +0000https://wid-blog.github.io/en/posts/tech/infra/vpc-security-fundamentals/How Security Groups (stateful, per-instance) and NACLs (stateless, per-subnet) form different layers of defense in a VPC, plus the common pitfalls each surface.https://wid-blog.github.io/en/posts/tech/infra/vpc-connectivity-fundamentals/Mon, 20 Oct 2025 00:00:00 +0000https://wid-blog.github.io/en/posts/tech/infra/vpc-connectivity-fundamentals/Comparing the four mechanisms that connect a VPC to other VPCs, on-premises networks, and external services — Peering, Transit Gateway, Site-to-Site VPN, and PrivateLink — across topology and cost.https://wid-blog.github.io/en/posts/tech/infra/vpc-routing-fundamentals/Wed, 01 Oct 2025 00:00:00 +0000https://wid-blog.github.io/en/posts/tech/infra/vpc-routing-fundamentals/How Route Tables decide traffic paths inside a VPC, the role of Internet Gateway and NAT Gateway as external exits, and the actual meaning of Public/Private Subnet.https://wid-blog.github.io/en/posts/tech/infra/vpc-isolation-fundamentals/Mon, 15 Sep 2025 00:00:00 +0000https://wid-blog.github.io/en/posts/tech/infra/vpc-isolation-fundamentals/How VPC simulates a private network boundary by combining IP CIDR, Subnet, and Tenancy. Includes vendor naming map across AWS / GCP / Azure / Alibaba.https://wid-blog.github.io/en/posts/tech/infra/kubernetes-fundamentals/Wed, 10 Apr 2024 00:00:00 +0000https://wid-blog.github.io/en/posts/tech/infra/kubernetes-fundamentals/Container orchestration basics and what backend developers need to know: core objects, networking, scaling with HPA, and operational essentials.https://wid-blog.github.io/en/posts/tech/infra/docker-container-fundamentals/Fri, 15 Mar 2024 00:00:00 +0000https://wid-blog.github.io/en/posts/tech/infra/docker-container-fundamentals/Covers container concepts, the differences from VMs, Docker’s architecture, and the basics of Dockerfile and Docker Compose.https://wid-blog.github.io/en/posts/tech/infra/kafka-fundamentals-kraft/Thu, 22 Feb 2024 00:00:00 +0000https://wid-blog.github.io/en/posts/tech/infra/kafka-fundamentals-kraft/Core Kafka concepts (topics, partitions, consumer groups, replication) and the background behind KRaft mode, which removes the ZooKeeper dependency.