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Kafka KRaft Mode: Single-Node Setup and Operations

Kafka KRaft Mode: Single-Node Setup and Operations

Run Apache Kafka without ZooKeeper: KRaft single-node setup, broker and controller roles, topic creation, retention settings and the commands you use

admin admin 2026-09-19
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systemd Timers vs Cron: Scheduling Jobs Properly

systemd Timers vs Cron: Scheduling Jobs Properly

Replace cron with systemd timers: OnCalendar expressions, Persistent catch-up runs, journal logging, dependency handling and safe migration rules.

admin admin 2026-09-19
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Linux auditd: Rules, auditctl and ausearch Investigations

Linux auditd: Rules, auditctl and ausearch Investigations

Build auditd rules that survive production: rule ordering, keys, auditctl verification, ausearch investigation and auditd performance tuning.

admin admin 2026-09-19
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cloud-init Network Configuration v2: Static IPs and Bonds

cloud-init Network Configuration v2: Static IPs and Bonds

Write cloud-init network config v2 for static IPs, multiple NICs, VLANs and bonds: netplan syntax, match rules, routes, and how to debug first-boot fa

admin admin 2026-09-19
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ipmitool Operations: Sensors, SEL, SOL and Power

ipmitool Operations: Sensors, SEL, SOL and Power

Use ipmitool on Linux for out-of-band server management: sensor and SDR reads, SEL review, Serial-over-LAN console access, power control and firmware

admin admin 2026-09-19
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PostgreSQL 16 Streaming Replication with pg_basebackup

PostgreSQL 16 Streaming Replication with pg_basebackup

Set up PostgreSQL 16 streaming replication: primary settings, replication slots, pg_basebackup bootstrap, verification queries and clean failover.

admin admin 2026-09-19
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HBA Queue Depth and SAN Multipath Tuning

HBA Queue Depth and SAN Multipath Tuning

Tune QLogic HBA queue depth and Linux multipath for SAN performance: ql2xmaxqdepth, no_path_retry, queue_if_no_path and how to make it persistent.

admin admin 2026-09-19
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fail2ban jail.local and nftables Backend Setup

fail2ban jail.local and nftables Backend Setup

Configure fail2ban the maintainable way: jail.local overrides, the systemd log backend, nftables banaction, custom filters tested with fail2ban-regex,

admin admin 2026-09-17
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strongSwan IKEv2 Site-to-Site VPN with swanctl

strongSwan IKEv2 Site-to-Site VPN with swanctl

Build an IKEv2 site-to-site tunnel with strongSwan and swanctl: certificates, connections, child SAs with traffic selectors, and the commands to verif

admin admin 2026-09-17
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DRBD 9 Setup: Resources, Promotion and Quorum

DRBD 9 Setup: Resources, Promotion and Quorum

Set up DRBD 9 replication: resource files, drbdadm create-md and up, the first full sync, promotion, quorum options and split-brain recovery after a f

admin admin 2026-09-17
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