troubleshooting 归档 - 第4页共26页

Chrony NTP Server Configuration on Linux

Configure chrony as NTP client and server: chrony.conf server lines, allow, makestep, driftfile, RTC sync, verification with chronyc tracking and sour

admin 2026-09-23

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SELinux Denials: Troubleshooting with ausearch

Fix SELinux denials the right way: ausearch for AVC messages, restorecon and semanage fcontext for labels, setsebool for booleans, audit2allow as a la

admin 2026-09-23

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Linux Software RAID with mdadm: Build and Recover

Create, monitor, grow and repair Linux software RAID with mdadm: GPT setup, bitmap resync, disk replacement workflow, mdadm.conf and initramfs persist

admin 2026-09-23

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ethtool Ring Buffers and Coalescing Tuning

Tune Linux NICs with ethtool: ring sizes, interrupt coalescing, queue counts, RSS and offloads. Includes verification commands and drop-counter diagno

admin 2026-09-23

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Linux tc HTB Traffic Shaping: A Practical Guide

Shape egress bandwidth on Linux with tc HTB: root qdisc, rate and ceil classes, fq_codel leaves, u32 and fw filters, IFB ingress and rollback.

admin 2026-09-23

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Group Policy Not Applying: Windows Troubleshooting

Diagnose Group Policy that will not apply on Windows clients: gpresult reports, security filtering, WMI filters, slow-link detection, SYSVOL and event

admin 2026-09-22

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Cisco ASR 9000 IM and SYSDB Debugging: show im database

Debug Cisco ASR 9000 interface problems at the IOS XR infrastructure layer: show im database, show imds interface brief and show sysdb connections exp

admin 2026-09-21

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Prometheus Alertmanager Routing and Notification Setup

Configure Alertmanager routing: group alerts by labels, build nested routes with matchers, set repeat_interval and inhibition, and test with amtool.

admin 2026-09-20

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MongoDB Replica Set Configuration and Failover Operations

Build a MongoDB replica set: initiate with a config document, add members, tune election priorities, and resync a member that has fallen off the oplog

admin 2026-09-20

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IGMP Snooping Querier Election: Configuration Guide

Configure an IGMP snooping querier with election on Cisco switches: SVI addressing requirements, timer behaviour, and verification of querier state.

admin 2026-09-20

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