Mustafa ERBAY

System architect with 20+ years in infrastructure. Building burncpu.com — an open-source social network. Personal blog: mustafaerbay.com.tr · EN/TR.

Bursa, Türkiye Joined on May 9, 2026 https://mustafaerbay.com.tr

Work

System architect · DevOps · Open-source builder

Mustafa ERBAY

Oct 4

CPU Quota Does Not Look at Your Average

#linux #cgroup #container #olcum

14 min read

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Mustafa ERBAY

Oct 4

I Could Not Turn On Journal Sealing; Only the Debug Log Said Why

#systemd #journald #linux #security

14 min read

Mustafa ERBAY

Oct 4

I Trust 158 Root Certificates. I Installed Three of Them

#security #certificates #macos #privacy

11 min read

Mustafa ERBAY

Oct 3

Forty-Four Posts in a Row From One Category, a Reader Caught It

#yazilimkariyeri #otomasyon #olcum #process

14 min read

Mustafa ERBAY

Oct 3

Who Inherits the Queue of a Closing Socket?

#linux #tcp #network #olcum

15 min read

Mustafa ERBAY

Oct 3

I Enabled casefold, and the Directory Stayed Case-Sensitive in Turkish

#ext4 #linux #unicode #dosyasistemi

18 min read

Mustafa ERBAY

Oct 2

Every New Command I Type Deletes an Older One

#zsh #macos #olcum #aliskanlik

11 min read

Mustafa ERBAY

Oct 2

I Left Sixty-Eight Backups; nginx Read Exactly One

#sistemyonetimi #nginx #systemd #olcum

13 min read

Mustafa ERBAY

Oct 2

I Tested ispmanager in Three Rounds: One Leak Fixed, Six Findings Retracted

#ispmanager #kontrolpaneli #security #phpfpm

25 min read

Mustafa ERBAY

Oct 2

My Quarantine Ledger Has 1,945 Rows and Not One Address

#macos #security #gatekeeper #karantina

14 min read

Mustafa ERBAY

Oct 1

I Have 91 Backups. None of Them Are This Machine's.

#backup #dataloss #macos #silentfailure

11 min read

Mustafa ERBAY

Oct 1

I Piled Up Seventy Branches; Six Were Really Unfinished

#git #measurement #technicaldebt #worklife

11 min read

Mustafa ERBAY

Oct 1

launchd Tried 21,881 Times. I Never Looked Once.

#macos #launchd #olcum #observability

12 min read

Mustafa ERBAY

Sep 30

I Spent 26% of the Cycles and 45% of the Capacity

#dizustu #macos #pil #olcum

14 min read

Mustafa ERBAY

Sep 30

How Much Room Is on My Disk? Five Answers, 13.5 GiB Apart

#macos #depolama #apfs #olcum

11 min read

Mustafa ERBAY

Sep 30

I Closed Twenty Findings; the Twenty-First Was My Own Patch

#security #codeql #statikanaliz #otomasyon

12 min read

Mustafa ERBAY

Sep 29

cgroup.pressure = 0: 86 ms of Stall Went Unrecorded

#linux #kernel #cgroupv2 #psi

14 min read

Mustafa ERBAY

Sep 29

I Enabled fast_commit and It Did Nothing for 4,000 fsyncs

#ext4 #linux #fsync #filesystem

17 min read

Mustafa ERBAY

Sep 29

My Laptop Woke 76 Times This Week; 13 of Them Were Me

#macos #olcum #isyasam #otomasyon

10 min read

Mustafa ERBAY

Sep 28

I Moved the Repo; Three Scripts Still Call the Old Name

#git #cicd #otomasyon #bakim

12 min read

Mustafa ERBAY

Sep 28

wbt_lat_usec 75000: ftrace Proved Me Wrong

#linux #kernel #blocklayer #wbt

15 min read

Mustafa ERBAY

Sep 28

I Wrote nice Into autogroup and Nothing Changed

#linux #kernel #scheduler #nice

15 min read

Mustafa ERBAY

Sep 27

copytruncate: A "Very Small Time Slice" Cost 33,879 Lines

#logrotate #linux #logmanagement #sysadmin

13 min read

Mustafa ERBAY

Sep 27

I Promised My Laptop 60 GiB. It Has 14.

#cicd #selfhosting #otomasyon #isyasam

12 min read

Mustafa ERBAY

Sep 27

Reverted in 90 Seconds, Broken for Five Hours

#git #cicd #production #softwarecareer

11 min read

Mustafa ERBAY

Sep 26

Docker Disabled accept_redirects, Not Me

#linux #network #security #sysctl

13 min read

Mustafa ERBAY

Sep 26

My Spam Filter Can No Longer Learn

#selfhosting #email #mailcow #rspamd

11 min read

Mustafa ERBAY

Sep 26

I Was Right Two Months Too Early

#dependencies #api #bakim #entegrasyon

10 min read

Mustafa ERBAY

Sep 25

I Made /usr Writable, systemd-analyze Said 1.5 OK

#systemd #security #hardening #linux

15 min read

Mustafa ERBAY

Sep 25

13,975 Views, Six of Them Came From Somewhere

#analytics #measurement #bots #blogging

11 min read

Mustafa ERBAY

Sep 25

One-Person Team, Seven Servers: What I Did Not Automate

#systemadministration #automation #production #workload

11 min read

Mustafa ERBAY

Sep 24

ASLR Isn't 32 Bits: Four Regions, Four Different Numbers

#linux #kernel #aslr #security

15 min read

Mustafa ERBAY

Sep 24

df Said Zero, Root Kept Writing

#linux #ext4 #disk #tune2fs

13 min read

Mustafa ERBAY

Sep 24

Rescuing a Scrapped Tablet for a Child

#android #root #cihaz #aile

11 min read

Mustafa ERBAY

Sep 23

The Agent Wrote; I Repaired It 67 Times

#otomasyon #yapayzeka #cicd #yazilimkariyeri

13 min read

Mustafa ERBAY

Sep 23

fstrim Said 2 GiB Again, and Nothing Was Freed

#linux #kernel #fstrim #ext4

15 min read

Mustafa ERBAY

Sep 23

The Neighbour Table Doesn't Know Namespaces

#linux #kernel #networking #docker

13 min read

Mustafa ERBAY

Sep 23

Why Is read_ahead_kb 8192? Linux 6.17 Believed the Disk

#linux #kernel #readahead #blocklayer

13 min read

Mustafa ERBAY

Sep 22

The 66 MiB Nobody Wrote Down: Who Sets min_free_kbytes?

#linux #kernel #sysctl #memory

15 min read

Mustafa ERBAY

Sep 22

The Server That Was Never Hacked

#fiction #story #incident #security

8 min read

Mustafa ERBAY

Sep 22

Three Numbers, One Alarm: Who Does vm.max_map_count Warn?

#linux #kernel #sysctl #elasticsearch

14 min read

Mustafa ERBAY

Sep 21

ionice: none Ignores It, mq-deadline Reads Class, BFQ Level

#linux #kernel #ioscheduler #ionice

13 min read

Mustafa ERBAY

Sep 21

Slot Zero Is Right: Which Copy Does md repair Believe?

#linux #mdadm #raid #kernel

14 min read

Mustafa ERBAY

Sep 21

Who Changed fs.file-max? A Container Did

#linux #systemd #kernel #docker

15 min read

Mustafa ERBAY

Sep 20

Sibling Denied, Grandchild Allowed: Who ptrace_scope=1 Stops

#linux #kernel #security #sysctl

12 min read

Mustafa ERBAY

Sep 20

TCP Fast Open: One RTT in the Lab, One Second on the Road

#linux #kernel #tcp #sysctl

13 min read

Mustafa ERBAY

Sep 20

55 Seconds in D State, Zero Warnings: khungtaskd's Blind Spots

#linux #kernel #sysctl #storage

13 min read

Mustafa ERBAY

Sep 19

Locked on My Laptop: the One-Way 1 of unprivileged_bpf_disabled, and bpf_jit_harden

#linux #kernel #ebpf #security

14 min read

Mustafa ERBAY

Sep 19

I Wrote 512 Bytes and Paid 1 GiB: THP, madvise and the 64 KiB Middle Road

#linux #kernel #thp #hugepages

12 min read

Mustafa ERBAY

Sep 19

Sysctl Says Zero, the Door Is Open: userfaultfd's Three Entrances

#linux #kernel #userfaultfd #security

13 min read

Mustafa ERBAY

Sep 18

dm-integrity Finds the Bad Block; To Fix It, It Wants a Mirror

#dmintegrity #linux #kernel #devicemapper

14 min read

Mustafa ERBAY

Sep 18

Zero for Root Too: kptr_restrict, dmesg_restrict and perf_event_paranoid

#linux #kernel #security #perf

12 min read

Mustafa ERBAY

Sep 18

fork: retry — Four Ceilings, One Error Message

#linux #kernel #cgroup #systemd

12 min read

Mustafa ERBAY

Sep 17

Whose Ten Percent Is dirty_background_ratio

#linux #kernel #pagecache #writeback

14 min read

Mustafa ERBAY

Sep 17

run0: Password in polkit, Caller in a journalctl Field

#run0 #sudo #systemd #polkit

8 min read

Mustafa ERBAY

Sep 17

Slow Consumers in NATS: Who Drops, Who Holds

#nats #jetstream #messaging #backpressure

8 min read

Mustafa ERBAY

Sep 17

Green Tea GC: 10 Percent on a Tree, 60 on a Map

#go #garbagecollector #greentea

8 min read

Mustafa ERBAY

Sep 16

TCP-AO: Changing the Key While the Connection Is Open

#tcp #tcpao #bgp #linux

10 min read

Mustafa ERBAY

Sep 16

Let the Disk Partition Itself: systemd-repart

#systemd #linux #gpt #dmverity

11 min read

Mustafa ERBAY

Sep 16

Written but Not Sent: The 487 KB Inside the Kernel

#tcp #linux #kernel #networking

11 min read

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