https://blog.homelab89.com/tags/troubleshooting/ Recent content in Troubleshooting on homelab89 Hugo ko-KR Mon, 29 Jun 2026 00:00:00 +0000 https://blog.homelab89.com/docs/k8s/cp1-vm-network-troubleshooting/ Mon, 29 Jun 2026 00:00:00 +0000 https://blog.homelab89.com/docs/k8s/cp1-vm-network-troubleshooting/ <blockquote><p>작성일: 2026-03-05</p> </blockquote><h2 id="증상">증상</h2> <ul> <li><code>virsh domifaddr k8s-cp1</code> 결과에 IP가 표시되지 않음</li> <li>VM에 SSH 접속 불가</li> </ul> <h2 id="원인-분석">원인 분석</h2> <h3 id="원인-1-네트워크-대역-불일치">원인 1: 네트워크 대역 불일치</h3> <p>VM은 <code>virbr0</code> (libvirt 기본 NAT 네트워크, <strong>198.51.100.0/24</strong>)에 연결되어 있었지만, cloud-init network-config에서는 <strong>203.0.113.70/24</strong>를 할당하고 있었다.</p> https://blog.homelab89.com/docs/homelab/nvidia-driver-downgrade/ Sun, 28 Jun 2026 00:00:00 +0000 https://blog.homelab89.com/docs/homelab/nvidia-driver-downgrade/ <h2 id="문제-상황">문제 상황</h2> <p>vLLM Docker 컨테이너(<code>vllm/vllm-openai:latest</code>, v0.15.1) 실행 시 아래 에러로 시작 실패:</p> <pre tabindex="0"><code>RuntimeError: Unexpected error from cudaGetDeviceCount(). Error 803: system has unsupported display driver / cuda driver combination </code></pre><h2 id="원인-분석">원인 분석</h2> <p>호스트와 컨테이너 간 CUDA 버전 불일치:</p>