Read the kernel log on a VPS with dmesg
A process vanished with no error of its own. Find the OOM kill in dmesg and journalctl -k, and read the disk and network messages a guest kernel sends.
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Does your VPS need swap? How to size it
Most cloud images ship with no swap. Here is when a small VPS needs a swap file, how big to make it, what vm.swappiness trades, and when zram wins.
Limit process memory and CPU with systemd
A capped process can still stall your whole VPS. Set MemoryHigh, MemoryMax, CPUQuota and TasksMax on a systemd unit, and read the OOM kill after.
Docker Compose memory limits that stop OOM
Set memory and CPU limits in Docker Compose so one greedy container cannot take down your VPS: deploy.resources, mem_limit, exit 137, swap, sizing.