mrcharles
422999bf3c
Performance optimization engagement for a 7-host Proxmox R&D cluster.
Captures the accumulated work across host tuning, network analysis,
fleet assessment, and kubernetes architecture planning.
Contents:
- Host-side tunings (scripts/): CPU governor, swappiness, BBR, NFS
nconnect, tuned profiles -- complete on 5 of 7 hosts
- Validation + benchmarking scripts: iperf matrix, bond/NFS fixes
- Collected host data (returned-logs/): check.sh output from all 7
hosts + iperf results, including newly-validated pfv-tsys9
- AGENTS.md: operating context for AI agents
- PROJECT.md: board-ready fleet assessment with VM placement and
storage redundancy analysis (40 VMs across 7 hosts)
- K8S.md: kubernetes architecture deep-dive covering cnode/wnode
distribution, StorageClass design, and ETL/HPC workload planning
💘 Generated with Crush
Assisted-by: Crush:glm-5.2
92 lines
3.7 KiB
Bash
Executable File
92 lines
3.7 KiB
Bash
Executable File
#!/bin/bash
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# reboot-verify.sh - reboots a host, waits for it to come back, verifies state.
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# Usage: bash reboot-verify.sh <host>
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set -uo pipefail
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HOST="$1"
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SSH_OPTS=(-o BatchMode=yes -o ConnectTimeout=5 -o ServerAliveInterval=5 -o StrictHostKeyChecking=accept-new)
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echo "================================================================"
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echo "[$HOST] PRE-REBOOT STATE"
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echo "================================================================"
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echo "--- Running VMs ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'qm list 2>/dev/null | awk "NR==1 || \$3==\"running\"{print}"' 2>&1
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echo "--- NFS mount count ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'nfsstat -m 2>/dev/null | grep -c "^/mnt"' 2>&1
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echo "--- NFS TCP connections to :2049 ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'ss -tn state established "( dport = :2049 )" 2>/dev/null | tail -n +2 | wc -l' 2>&1
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echo "--- Uptime ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'uptime' 2>&1
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echo ""
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echo "================================================================"
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echo "[$HOST] ISSUING REBOOT"
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echo "================================================================"
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# Issue reboot; ssh will disconnect with non-zero — that's expected.
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'nohup sh -c "(sleep 2; systemctl reboot)" >/dev/null 2>&1 &' 2>&1
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echo "Reboot command sent at $(date +%H:%M:%S). Host will drop now."
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echo ""
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echo "================================================================"
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echo "[$HOST] WAITING FOR SSH TO RETURN (max 10 minutes)"
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echo "================================================================"
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DEADLINE=$(( $(date +%s) + 600 ))
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LAST_PRINT=0
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while [ "$(date +%s)" -lt "$DEADLINE" ]; do
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now=$(date +%s)
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# Print a heartbeat every 15s
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if [ $((now - LAST_PRINT)) -ge 15 ]; then
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elapsed=$((DEADLINE - now - 600)); elapsed=${elapsed#-}
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echo " [$(date +%H:%M:%S)] still waiting... (${elapsed}s elapsed)"
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LAST_PRINT=$now
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fi
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# Try SSH
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if ssh "${SSH_OPTS[@]}" "root@$HOST" 'echo ok' >/dev/null 2>&1; then
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echo " [$(date +%H:%M:%S)] SSH is back!"
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break
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fi
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sleep 5
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done
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# Final check
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if ! ssh "${SSH_OPTS[@]}" "root@$HOST" 'echo ok' >/dev/null 2>&1; then
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echo " [$(date +%H:%M:%S)] FAILED: host not reachable after 10 minutes"
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exit 1
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fi
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# Give services a moment to settle after SSH returns
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echo " Waiting 20s for services to settle..."
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sleep 20
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echo ""
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echo "================================================================"
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echo "[$HOST] POST-REBOOT VERIFICATION"
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echo "================================================================"
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echo "--- Uptime ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'uptime' 2>&1
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echo ""
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echo "--- TCP congestion control ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'sysctl net.ipv4.tcp_congestion_control net.core.default_qdisc' 2>&1
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echo ""
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echo "--- vm.swappiness ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'sysctl vm.swappiness' 2>&1
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echo ""
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echo "--- scaling_governor ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor 2>/dev/null || echo "(no cpufreq driver)"' 2>&1
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echo ""
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echo "--- NFS mount options (looking for nconnect + noatime) ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'nfsstat -m 2>/dev/null | head -20' 2>&1
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echo ""
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echo "--- NFS TCP connection count (expect ~8 = 4 per server with nconnect=4) ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'ss -tn state established "( dport = :2049 )" 2>/dev/null | tail -n +2 | wc -l' 2>&1
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echo ""
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echo "--- Running VMs ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'qm list 2>/dev/null' 2>&1
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echo ""
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echo "--- Failed services? ---"
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ssh "${SSH_OPTS[@]}" "root@$HOST" 'systemctl --failed --no-legend 2>/dev/null | head -10' 2>&1
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echo ""
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echo "================================================================"
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echo "[$HOST] DONE"
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echo "================================================================"
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