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Silvio Silva

systems · cloud

Cloud & Systems Engineer · Lisbon, Portugal

Technical notes on distributed systems, Linux kernel networking, BGP routing, and infrastructure orchestration at scale. Practical experiences from production environments.

Topic: All (1) #terraform 5 #iac 4 #devops 4 #architecture 3 #networking 2 #cloud 2 #wireguard 1 #linux 1 #vpn 1 #bgp 1 #ipv6 1 #routing 1 #bird2 1 #github-actions 1 #security 1 #aws 1 #best-practices 1 #gitops 1 × Clear filter

Articles tagged #gitops

1 article

Oct 9, 2026 • 3 min read • #terraform

Terraform in Production (Part 4): Declarative State Surgery with moved and import Blocks

Moving beyond risky CLI state manipulation. How native moved and import blocks allow seamless zero-downtime refactoring and declarative onboarding in Git.

#terraform #iac #devops #gitops

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Terraform (Part 1): Why HCL Beats Cloud-Native IaC The single cloud fallacy, multi-provider orchestration Terraform (Part 2): Air-Gapped CI/CD with GitHub Actions OIDC cryptographic tokens, private VPC self-hosted runners Terraform (Part 3): The Module Dilemma Leaky abstractions, God module anti-pattern, Sandi Metz rule WireGuard & MTU/MSS: Prevent Packet Loss on Linux Packet encapsulation overhead, fragmentation, TCP MSS clamping Welcome to BGP: Setting Up Your IPv6 Network ASN, Bird2 daemon, IPv6 prefix peering

WireGuard & Tunnel MTU / MSS Clamping Calculator LIVE MATH

Tunnel Protocol

Outer IP Layer

Base Ethernet MTU

MAX SAFE TUNNEL MTU: 1448

TCP MSS CLAMP: 1408

Terraform Moved Block Synthesizer HCL 1.1+

Old State Address

New Refactored Address

moved {
  from = aws_security_group.allow_tls
  to   = module.network.aws_security_group.allow_tls
}

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