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Linux Troubleshooting Runbook Finder Online-Tool

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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