#sysadmin articles

Nitin | RouterIPGuide15h ago · 3 min read

Understanding IPv4 Subnetting and CIDR Notation: Host Calculations and Boundary Rules

Calculating IPv4 subnets, broadcast addresses, and assignable host scopes is an essential competency for systems engineers, network architects, and homelab builders. When partitioning address space ac

routeripguide.hashnode.dev

Christopher Smith10h ago · 4 min read

0x8A15000F Data Required by the Source Is Missing in winget

This post first appeared on the ET Ducky blog. I build ET Ducky, an RMM that reads ETW on Windows and eBPF on Linux. 0x8A15000F is the winget return code APPINSTALLER_CLI_ERROR_SOURCE_DATA_MISSING, wi

etducky.hashnode.dev

JJozzieTech1d ago · 18 min read

Six months operating an Akash provider

In May the provider missed a mandatory upgrade deadline, lost its audit attestation, and watched roughly four-fifths of its active leases disappear inside two weeks. The recovery took twenty-six days.

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Sanskriti Harmukh1d ago · 8 min read

Generating System Hardware Report in Linux

Understanding your system's hardware configuration is essential for developers and system administrators, whether you're verifying hardware compatibility, diagnosing performance issues, or planning up

vultr.hashnode.dev

Sanskriti Harmukh1d ago · 6 min read

Checking Disk Space and Usage in Linux

A full disk can degrade system performance, cause services to fail, and even prevent you from logging in or accessing essential directories, so keeping an eye on disk usage is a core part of running a

vultr.hashnode.dev

Kazem Mortazavi1d ago · 2 min read

Rolling Out DLP Without Breaking the Business: A Phased Approach

Many data loss prevention projects fail in the first week. Not because the product is weak, but because the policies are switched to block mode before anyone understands how data actually moves throug

securityland.hashnode.dev

Pro Gineous1d ago · 8 min read

Is a Disk Dying in Your Dedicated Server? How to Check Disk Health on Linux

A dedicated server with two disks in RAID 1 can lose one of them and keep running as if nothing happened. That's the point of RAID, and it's also the trap. The site stays up, nobody gets an alert, and

progineous.hashnode.dev

Kazem Mortazavi2d ago · 2 min read

Where Your Internal CA and Code-Signing Keys Should Live

Where is your internal root CA key right now? In many infrastructure reviews nobody can answer that precisely. In one of them, the root key sat as a .pfx file on a VM backup share, and the code-signin

securityland.hashnode.dev

AumCreate2d ago · 7 min read

An AI crawler is making your server slow: confirm it from the log, then rate-limit that one bot

Traffic climbs overnight, PHP-FPM workers sit at their limit, TTFB goes from a few hundred milliseconds to several seconds, and the database is doing work it wasn't doing last week. Nobody deployed an

aumcreate.hashnode.dev

Kazem Mortazavi3d ago · 3 min read

Running ESET PROTECT On-Premises: Which Features Actually Work Without the Cloud

Endpoint protection tiers are usually compared as a single feature table. That works until your organization decides the management console must run on its own servers. Then a surprising part of that

securityland.hashnode.dev

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Trending tags this week

Understanding IPv4 Subnetting and CIDR Notation: Host Calculations and Boundary Rules

0x8A15000F Data Required by the Source Is Missing in winget

Six months operating an Akash provider

Generating System Hardware Report in Linux

Checking Disk Space and Usage in Linux

Rolling Out DLP Without Breaking the Business: A Phased Approach

Is a Disk Dying in Your Dedicated Server? How to Check Disk Health on Linux

Where Your Internal CA and Code-Signing Keys Should Live

An AI crawler is making your server slow: confirm it from the log, then rate-limit that one bot

Running ESET PROTECT On-Premises: Which Features Actually Work Without the Cloud