A server that answered yesterday and times out today has rarely been hacked. It has run out of memory, filled its disk, or let one PHP script spin a core at 100%. This section finds the culprit with ps, htop 386,022 , vmstat, df and lsof 574 , then keeps your own programs alive with pm2 29,762 or supervisord 121,801 , weighed against systemd Services's units.
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Processes and Monitoring
Process Monitoring and Keeping Programs Alive