🔴 Hot News: tag/sysadmin - Kapook Update 2025

Level UI • 19 hours • in Articles • 9 min read

An MCP server is not a new API. It is a thin layer over the one you already have

Somewhere in the last year, "do we need an MCP server?" joined the list of questions that arrive in a brief before anyone has said what the thing is for. It is usually framed as MCP vs API, as though the Model Context Protocol were a newer kind of AP...

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BashSnippets • 1 day • in Articles • 1 min read

Finding the world-writable files on your server before someone else does

A world-writable file can be rewritten by every account on the machine — including the service account your web server runs as. Code executing as www-data through a compromised plugin doesn't need root: any chmod 777 you left behind during past debug...

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BashSnippets • 2 days • in Articles • 1 min read

The log was deleted. Its 48M was still allocated.

A 64M scratch tmpfs, a worker process holding its log open on file descriptor 3, and the usual reflex when space runs low: rm the log. du on the directory dropped from 48M to 0. df stayed at 48M used. The next 32M write failed with No space left on d...

2 Reactions 1 Comments

CodeWithRomi • 5 days • in Articles • 9 min read

Patch These Four Linux Kernel Local Root Vulns Now: DirtyAH6, PPPoEject, TUNderflow, and DiagSpill

Originally published at codewithromi.comhttps://codewithromi.com/patch-these-four-linux-kernel-local-root-vulns-now-dirtyah6-pppoeject-tunderflow-and-diagspill/. Four Linux kernel vulnerabilities went public on 18 September 2026, and they are the kin...

6 Reactions 2 Comments

BashSnippets • Oct 21 • in Articles • 1 min read

bash ran a path that no longer existed, and exited 127

A demo script called report, two directories on PATH, and one mv between them, all on a scratch tmpfs: $ report report 2.1: 14 jobs ok exit=0 $ mv /opt/jobs/bin/report /opt/jobs/newbin/report $ ls -l /opt/jobs/newbin/report rwxrwxr-x 1 root root 42 ...

2 Reactions 1 Comments

BashSnippets • Oct 15 • in Articles • 1 min read

Every disk-alert script I had piped into a command this machine does not have

The standard bash alerting pattern ends the same way everywhere you read it: pipe the finding into mail. So I checked what my own box would actually do with that line. $ type -a mail mailx sendmail mail not found mailx not found sendmail not found ...

4 Reactions 2 Comments

BashSnippets • Oct 14 • in Articles • 1 min read

One empty variable, one error, one wrong answer, exit 0

I wrote four lines to capture a bash error for a guide. One empty variable, tested twice: $ cat queue-check.sh !/bin/bash count="" if $count -eq 0 ; then echo "queue empty"; fi if $count -eq 0 ; then echo "queue empty "; fi $ bash queue-check.sh...

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BashSnippets • Oct 8 • in Articles • 1 min read

My 30-day log cleanup kept a file that was 30 and a half days old

I set three log files to known ages with touch -d — exactly 30 days, 30 days and 12 hours, and 31 days — then ran what I thought was a 30-day retention policy: find . -name '.log' -mtime +30 It returned one file: the 31-day-old one. The 30.5-day f...

1 Reactions 2 Comments

Tom Smithverified • 15 hours • in Articles • 9 min read

Developer Weekly Briefing — October 30, 2026

Security dominated this week, but not in the usual way. Two active campaigns turned GitHub configuration files into attack surfaces. Researchers demonstrated that the built-in browsers inside AI coding tools can read your SSH keys. And at Oracle AI ...

6 Reactions 3 Comments

BashSnippets • Oct 6 • in Articles • 1 min read

Catch a filling disk weeks before it becomes an outage

A disk almost never fails loudly. It fills a percent at a time until writes stop, and at 100% nothing reports "disk full" — the database throws write errors about its own files, apps crash-loop, and logging a write itself stops recording at the exact...

2 Reactions 0 Comments

BashSnippets • Oct 1 • in Articles • 1 min read

sed 's/port/listen_port/g' rewrote four lines of a four-line config

A four-line YAML file port: 8080, supportemail, transport: tcp, reportdir: /var/reports and the rename most people type first: sed -i 's/port/listenport/g' app.yml. GNU sed 4.9 exited 0 and printed nothing, because -i never does. Afterwards the file ...

4 Reactions 2 Comments

alexvoste • Sep 25 • in Articles • 6 min read

What a Linux Sysadmin Actually Does All Day (Spoiler: It's Not Just `sudo apt update`)

Somewhere out there is a job posting that describes a "Linux System Administrator" as someone who "maintains servers." That description is technically true the way "doctors deal with bodies" is technically true. It tells you nothing, it undersells th...

11 Reactions 2 Comments

spounka • Sep 24 • in Articles • 5 min read

Why I prefer systemd timers over cronjobs

Most users would schedule their tasks using a cronjob, and that's perfectly reasonable Introduction > I will assume you are running on a linux machine with systemd which you should be if you're running on a server, other init systems such as runit ...

3 Reactions 2 Comments

BashSnippets • Sep 24 • in Articles • 1 min read

I sent my report script SIGTERM mid-write. Yesterday's output survived intact.

A script that writes straight to the path a consumer reads can die halfway and leave a torn file that everything downstream loads as complete. No error appears anywhere, because the only process that failed is gone. I tested the fix the unfriendly wa...

8 Reactions 2 Comments

BashSnippets • Sep 16 • in Articles • 1 min read

Who owns that port? One ss flag answers it without sudo

Who owns that port? One ss flag answers it without sudo For months my dev server started on 3001 because something already held 3000, and I kept stepping around it. When I finally asked, ss -ltn 'sport = :3000' showed the port listening on every in...

2 Reactions 2 Comments

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