Overnight Azure Kernel Upgrade Stopped MongoDB From Starting on a VM

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A team found their application down one morning with no deployments or configuration changes to blame. Investigation showed MongoDB refusing to start, with logs pointing to a known incompatibility between MongoDB 8.0.29 and Linux kernel 6.19 and newer. Azure had automatically upgraded the VM's kernel overnight during a maintenance window, moving it to a version that MongoDB explicitly blocks. Early attempts to fix the problem through file permissions and lock-file removal were unsuccessful. The root cause was identified as the kernel change, not data corruption or misconfiguration.

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