troubleshooting 归档 - 第8页共26页

Linux chrony NTP Sync Troubleshooting with chronyc

Diagnose clock sync on Linux with chronyc tracking, sources and sourcestats, fix a stepped clock with makestep, and harden chrony.conf for servers and

admin 2026-09-17

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Cisco Nexus 9000 TCAM Carving and ACL Regions

How Nexus 9000 TCAM carving works, why %ACLQOS out-of-resource errors appear, and which show commands verify ACL regions before you reboot to change t

admin 2026-09-17

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Docker overlay2 Disk Full: Safe Cleanup Order

Fix Docker 'no space left on device': tell bytes from inodes, map overlay2 directories to containers, prune in the safe order and cap container logs.

admin 2026-09-15

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Redis Persistence: RDB vs AOF Configuration

Choose and tune Redis persistence: RDB snapshot triggers, AOF fsync policies, the hybrid RDB-preamble format and how to verify recovery behaviour.

admin 2026-09-15

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Elasticsearch Red/Yellow: Unassigned Shards Fix

Fix red and yellow Elasticsearch clusters: read cluster health, find unassigned shards, use the allocation explain API and clear the real causes.

admin 2026-09-15

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Linux conntrack: 'table full, dropping packet' Fix

Fix nf_conntrack table full drops: raise nf_conntrack_max and hashsize safely, tune TCP timeouts, and cut the tracked flows you do not need.

admin 2026-09-15

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Proxmox VE Quorum Loss: Corosync Recovery Steps

Diagnose Proxmox VE quorum loss and corosync failures: read pvecm status, avoid unsafe recovery, and restore quorum without corrupting the cluster.

admin 2026-09-15

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OTDR Trace Interpretation: Events, Loss, Reflectance

Read an OTDR trace correctly: identify reflective and non-reflective events, expected loss and reflectance values, and separate bends from bad splices

admin 2026-09-15

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FortiGate debug flow: Trace Packets Step by Step

Use diagnose debug flow on FortiGate to trace a packet through routing, policy and NAT, read function names and check the session table.

admin 2026-09-15

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ArubaOS-CX Loop Protection: Configure and Verify

Enable ArubaOS-CX loop-protect on ports, LAGs and VLANs, choose the loop action, tune timers and verify detection with show loop-protect.

admin 2026-09-15

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标签：troubleshooting