EDGE NOTESA small systems journal

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Categories

Start with the layer you are trying to understand.

Linux 02Networking 03Performance 02Protocols 02Security 03

Linux

01
Linux

A small server needs a baseline

Record enough context to distinguish a system problem from an application symptom.

07
Linux

Caddy as a small static origin

Keep the document root, TLS automation and deployment process easy to inspect.

Networking

02
Networking

Reading TCP under load

Use congestion, flow control and application demand as separate explanations.

06
Networking

DNS: from label to destination

Separate authoritative data, recursive caches and application-level routing.

11
Networking

A network debugging ladder

Locate the failing layer before changing a setting.

Performance

03
Performance

BBR, buffers and the delay budget

Why a larger buffer and a faster congestion controller are different decisions.

10
Performance

Monitoring small VPS machines

A handful of well-defined measurements can be more useful than a busy dashboard.

Protocols

04
Protocols

QUIC is more than UDP

Understand the layers before interpreting an HTTP/3 or tunnel trace.

12
Protocols

IPv4 and IPv6 without assumptions

Treat dual-stack service as two paths that each need validation.

Security

05
Security

Certificates are a lifecycle

Issuance is only the first part of a dependable TLS deployment.

08
Security

SSH access with an exit plan

Temporary access should be scoped, attributable and easy to remove.

09
Security

Firewall changes you can explain

Small, owned rule changes are easier to audit and recover.

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