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After a reboot the journal is empty. How does journald decide what to keep, and how do you fix retention?

Volatile by default on many distros, size-capped by silent policy, binary on disk. Know the storage modes, the vacuum knobs, and how journald feeds central logging.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

Volatile by default on many distros, size-capped by silent policy, binary on disk. Know the storage modes, the vacuum knobs, and how journald feeds central logging.

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Next in this trackBackup window is five minutes on a busy database volume. How do LVM snapshots give you a safe image?Next in this trackOne service saturates the shared disk every night. How do you contain it with the cgroup v2 io controller?Next in this trackRedis warns against transparent hugepages while the DBA asks for 2MB pages. Who is right?

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