RHEL / Red Hat · medium · solved in-browser (no VM needed) · 3 tiered hints
Write /etc/security/limits.d/99-nofile.conf raising the open-file-descriptor limit for all users to 65535: one soft nofile line and one hard nofile line, each using the * domain, both set to 65535. Columns are whitespace-separated: domain type item value. (Authored config, graded structurally — the engine isn't run here.)
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Red Hat-family specifics: rpm, dnf, SELinux and packaging.
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