Browse incidents, troubleshooting guides, AI diagnostics, verified fixes and community discussions related to Linux.
## Environment Proxmox VE 7.x cluster. Backups created with vzdump and restored to different nodes for quick recovery/testing. Network model is default LXC veth with MAC sometimes specified in config as 'hwaddr:'. Switching node and restore automati...
## Environment GKE-like cluster: two node pools — old pool (Ubuntu 18.04, no hugepages) where workload stable, upgraded node pool (Ubuntu 20.04, kernel 5.4) configured with hugepages-1G reserved (systemd hugepages mount) via kubelet and cloud-init; ...
## Environment vSphere ESXi 7.0 hosts (3-node cluster) backed by SAN LUNs presented via iSCSI; storage array firmware upgraded overnight; several VMs stored on upgraded datastores; HA enabled; one host shows disconnected state briefly during upgrade...
## Environment Edge router: OpenWrt 22.03 on ARM appliance; LAN clients include Ubuntu 22.04 laptops, Android phones, and an Apple TV; upstream prefix delegated via ISP DHCPv6-PD. Router configured to disable DHCPv4 and serve only DHCPv6/SLAAC. ## ...
## Environment Proxmox KVM host (Linux 5.15), Mellanox/Intel dual-port 25Gb NIC; firmware and vendor driver updated to latest on host during maintenance. Guests use virtio-net vNICs bridged to host bond; previously ran with MTU 9000 and stable. ## ...
## Environment On-prem Kubernetes 1.23 control plane, 5 worker nodes (Ubuntu 20.04, Docker 20.10.12, kubelet configured with cgroupDriver=systemd). Workers: 128GB RAM, 32 vCPU. Applications deployed as Deployments with requests/limits set (example: ...
## Environment PostgreSQL upgraded in-place from 13.5 to 14.2 on Ubuntu 20.04 LTS. A third-party C extension (installed from distro package and also a site-built variant) is listed in shared_preload_libraries and the cluster runs on a 16-core VM wit...
## Environment OPNsense 22.1 firewall at HQ terminating IKEv2 IPsec tunnel to Cisco ASR at remote site; both ends use NAT on the WAN side; MTU on LAN interfaces set to 1500; encapsulation adds ~60 bytes of overhead; endpoints include Linux file serv...
## Environment CI: GitHub Actions self-hosted Ubuntu 20.04 runners with Docker Engine 20.10 using overlay2 on ext4; runners are VMs on on-prem KVM cluster; CI builds multi-stage Dockerfiles that copy artifacts from builder stage to final stage; rece...
## Environment Home network: OpenWrt 22.03 router running dnsmasq + tayga-based NAT64; LAN clients dual-stack (SLAAC + DHCPv4); clients include Windows 10, macOS 12, Android 11; upstream ISP provides IPv4/IPv6. ## Symptoms Random subset of devices...