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    • Oracle Linux: Resolving VM Hang Due to Memory Exhaustion Caused by Fluentd OOM Errors

    in Linux

    Applies To:

    Oracle Cloud Infrastructure

    Linux OS

    Symptoms:

    The VM became inaccessible via PuTTY/SSH and appeared to hang.

    Critical processes (such as SSSD for authentication) were failing or returning "Connection refused" errors.

    Logs in /var/log/messages showed Out-Of-Memory (OOM) killer events, specifically targeting the FluentD process:

    “ Feb 12 17:40:10 inoclacda1001 kernel: <fluentd> invoked oom-killer: Out of memory: Killed process 31520 (fluentd) “

    Authentication logs in /var/log/secure contained multiple entries where SSSD was unable to process requests:

    Feb 12 17:19:20 inoclacda1001 sshd[2723617]: pam_sss(sshd:session): Request to sssd failed. Connection refused

    These errors prevented users from accessing the VM, effectively halting operations.

    Tagged:

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