Server OOM (Out of Memory) / Process Terminated AbruptlyMemory
Triage Commands:
$ dmesg -T | grep -i oom
$ journalctl -xb | grep -i "killed process"
$ free -m
Quick Resolution: Adjust heap limits or add emergency Swap: fallocate -l 4G /swapfile && mkswap /swapfile && swapon /swapfile
Disk Full 100% / No Space Left on Device (ENOSPC)Disk
Triage Commands:
$ df -h
$ df -i
$ du -sh /* 2>/dev/null | sort -rh | head -n 10
$ lsof +L1
Quick Resolution: Truncate large open logs: > /var/log/app.log or restart holding PID found with lsof +L1
High CPU Load Average while %CPU is LowCPU
Triage Commands:
$ vmstat 1 5
$ iostat -xz 1 5
$ top -b -n 1 | head -n 15
Quick Resolution: Check blocked processes: ps -eo state,pid,cmd | grep "^D"
DNS Name Resolution Failure / Temporary Failure in Name ResolutionNetwork
Triage Commands:
$ cat /etc/resolv.conf
$ systemd-resolve --status
$ dig +short google.com @1.1.1.1
Quick Resolution: sudo systemctl restart systemd-resolved || echo "nameserver 1.1.1.1" | sudo tee /etc/resolv.conf
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