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MetalLB Layer2 vs BGP: Address Pool Setup

MetalLB on bare metal: compare Layer2 leader election with BGP service-IP advertisement, then build IPAddressPool, L2Advertisement and BGPPeer objects

admin 2026-09-14

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Ceph CRUSH Map: Device Classes and Custom Rules

Use Ceph device classes (ssd, hdd, nvme) and CRUSH rules to land each pool on the right hardware, plus EC profiles, the upmap balancer and verificatio

admin 2026-09-14

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ZFS Send and Receive: Snapshot Replication Guide

Replicate ZFS datasets end to end: recursive snapshots, incremental zfs send -R over SSH, raw sends for encrypted data, mbuffer tuning and stream veri

admin 2026-09-14

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Linux Bonding 802.3ad: LACP Rate and Hash Policy

Tune Linux bonding mode 4 properly: lacp_rate, xmit_hash_policy, ARP monitoring, VLAN placement, flow-distribution checks and the switch-side requirem

admin 2026-09-13

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Proxmox VE Networking: VLAN-Aware Bridge and LACP

Proxmox VE networking guide: VLAN-aware Linux bridges, 802.3ad LACP bonds, bridge-vids, safe apply with ifreload and the commands that verify the resu

admin 2026-09-13

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SONiC config_db.json: Save, Reload and Replace Safely

SONiC keeps config in Redis and persists it only on request. See how save, reload, replace and load_minigraph differ, with docker and redis verificati

admin 2026-09-13

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bpftrace One-Liners for Production Linux Debugging

bpftrace one-liners for production Linux: which process opens which file, which syscall is slow, read-size histograms and the BTF prerequisites.

admin 2026-09-12

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Ceph OSD Down and Stuck PGs: A Triage Runbook

Triage Ceph from the CLI: read ceph -s and health detail for down OSDs, inspect stuck and incomplete PG states, and replace an OSD without a rebalance

admin 2026-09-12

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TLS Certificate Chain Problems: Diagnosing with OpenSSL

Use openssl s_client to prove a certificate chain end to end: missing intermediates, SNI problems, expiry and trust-store gaps, with the exact command

admin 2026-09-11

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Linux Network Namespaces and veth Pairs in Practice

Build isolated networks with ip netns and veth pairs: create namespaces, route between them, bridge multiple peers, and debug inside containers with n

admin 2026-09-11

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标签：linux