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27 posts filed under this topic.

  1. [security]eMudhra CA compromise: my Mac's curl still trusted the bad certificatesEight eMudhra intermediate CA keys got compromised. Browsers already block them, but the curl that ships with macOS still trusted them. How I tested it and what I did about it.
  2. [linux]BlankOn Linux 26.09 Sinambung telah dirilis!Setelah 303 hari sejak 23 November 2025, kami dengan senang hati mengumumkan bahwa BlankOn Linux 26.09 Sinambung, dengan nama kode ISO Verbeek, telah resmi dirilis.
  3. [kvm]Summarize Guest VMs StatusA one-liner with awk that counts running, paused, idle, and shut-off KVM guests from virsh list --all output. Quick health check on a busy hypervisor.
  4. [linux]How to Fix SFP UnsupportedIf you've encountered difficulties in locating the appropriate interface with a 10G uplink, you may have observed instances where the interface fails to appear. This happens when the ixgbe module fails to load due to the detection of an unsupported SFP+ module type. Wondering how to resolve…
  5. [linux]Linux find: which one is faster?Compare the execution times of Linux find commands when listing files, using terminal output from a small command-line benchmark.
  6. [linux]Linux process state codes explained: R, S, D, Z and more in ps and topWhat the STAT column in ps and the S column in top mean on Linux: every process state code (R, S, D, I, T, Z…), the extra flags like s, l and +, and how to find stuck and zombie processes.
  7. [linux]LDAP: All I need to know (WIP)What is LDAP and why it is used? LDAP stands for Lightweight Directory Access Protocol. It is a protocol used for accessing and managing directory information services over a network. A directory service is a centralized database that stores and manages information about users, devices, and…
  8. [linux]UID RangesSpecific UID numbers and ranges of numbers are used for specific purposes by Red Hat Enterprise Linux. • UID 0 is always assigned to the superuser account, root. • UID 1-200 is a range of "system users" assigned statically to system processes by Red Hat. • UID 201-999 is a range of "system…
  9. [linux]lldpd: unable to send packet on real deviceNotes on lldpd errors after a network restart, with example log messages and restarting the lldpd service to reopen its interfaces.
  10. [docker]Docker InstallationInstall Docker Engine and the Compose plugin on a CentOS server, enable the service, and keep the removal commands handy.
  11. [hardware]How many your memory capacity?Use dmidecode to count memory slots, identify empty slots, and inspect the installed RAM capacity and location in a Linux server.
  12. [security]Hard to implement IPTables? Try this.Install ConfigServer Security & Firewall on a Linux server, add its Perl dependencies, and check whether the required firewall modules work.
  13. [virtualization]Migration Progress VMMemantau proses migrasi virtual machine melalui virsh ketika antarmuka infrastruktur cloud tidak menyediakan progress bar.
  14. [linux]Run Command Linux as a Systemd ServiceMembuat service systemd untuk Node Exporter: menyiapkan binary, menulis unit file, reload daemon, dan mengaktifkan service saat boot.
  15. [linux]Ethtool: Blink your NICIdentify a physical network port by blinking its NIC LED with ethtool, using an interface name and a duration in seconds.
  16. [linux]Ledmon: Blink your disk enclosureIntel's open-source ledmon lets you blink the LED on a specific drive in a server enclosure — handy when you need to physically locate a disk before pulling the wrong one.
  17. [kubernetes]Kubernetes: Connection RefusedTroubleshoot a kubeadm initialization failure caused by unhealthy kubelet cgroups, configure Docker to use systemd, and restart the services.
  18. [linux]Check Mounted FilesystemInspect mounted filesystems on Linux with findmnt and df, including examples for filtering filesystem types and displaying disk usage.
  19. [linux]tmux - Sang Penyelamattmux – terminal multiplexer. Mirroring command :setw synchronize-panes ( on|off )
  20. [hardware]Query Disk Serial NumberMencari serial number disk melalui udevadm untuk membantu mencocokkan perangkat saat menyiapkan dan merakit infrastruktur server.
  21. [linux]netconsoleCatatan awal untuk riset netconsole, dengan tautan ke dokumentasi kernel Linux dan panduan konfigurasi dari Red Hat Enterprise Linux.
  22. [linux]perl: warning: Setting locale failed.Notes on resolving Perl locale warnings by setting LANGUAGE and LC_ALL, with examples for different environments and the Fish shell.
  23. [linux]SAR for LinuxSystem Activity Reports — using sar to investigate a sudden server crash. Where the data lives, how to generate plain-text reports, and a free chart tool to actually make sense of the numbers.
  24. [apache]Apache2 deny rules: 2.2 vs 2.4 syntaxQuick reference for restricting access in Apache: the order/deny/allow syntax of 2.2 vs the Require syntax of 2.4 — almost the same problem, almost the same words, different config.
  25. [linux]Backlog ResearchI need to research this things in spare times. * compact_memory * glusterfs benchmark performances * netconsole
  26. [logstash]Logstash: SIGHUP for Reloading New ConfigReload Logstash pipeline config without restarting the service — just send SIGHUP to the running process and watch the log confirm the reload.
  27. [linux]Recurring CommandsA scratchpad of one-liners I keep typing — find files older than N days, list IPs, and the others I'm too lazy to memorize properly.

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