73 lines
2.1 KiB
Bash
Executable File
73 lines
2.1 KiB
Bash
Executable File
#!/bin/bash
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set -euo pipefail
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echo "=== [1/5] Updating system and installing tools ==="
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sudo apt update
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sudo apt -y upgrade
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sudo apt install -y qemu-guest-agent util-linux haveged ethtool lshw dmidecode
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echo "=== [2/5] Enabling qemu-guest-agent ==="
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sudo systemctl enable --now qemu-guest-agent
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echo "=== [3/5] Trimming filesystems ==="
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sudo fstrim -av || true
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echo "=== [4/5] Detecting VM NICs ==="
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NIC_LIST=()
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for nic in /sys/class/net/*; do
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nicname=$(basename "$nic")
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if [[ "$nicname" != "lo" && "$nicname" != vmbr* && "$nicname" != tap* && "$nicname" != veth* && "$nicname" != docker* ]]; then
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NIC_LIST+=("$nicname")
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fi
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done
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if [[ ${#NIC_LIST[@]} -eq 0 ]]; then
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echo "⚠️ No usable NICs detected. Exiting."
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exit 1
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fi
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echo "VM NICs detected: ${NIC_LIST[*]}"
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echo "=== [5/5] Creating systemd service with conditional logic ==="
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SERVICE_FILE="/etc/systemd/system/conditional-nic-offload.service"
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sudo tee "$SERVICE_FILE" > /dev/null <<EOF
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[Unit]
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Description=Disable NIC offloads only if KVM + Broadcom detected
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After=network-online.target
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Wants=network-online.target
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[Service]
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Type=oneshot
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ExecStart=/bin/bash -c '
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HYPERVISOR=\$(systemd-detect-virt)
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BROADCOM_FOUND=\$(lspci | grep -i "broadcom" || true)
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if [[ "\$HYPERVISOR" == "kvm" && -n "\$BROADCOM_FOUND" ]]; then
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echo "✅ Broadcom NIC on KVM detected — applying NIC tuning";
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$(for nic in "${NIC_LIST[@]}"; do
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echo "/usr/sbin/ethtool -K $nic tx off rx off tso off gso off gro off;"
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echo "/sbin/ip link set $nic txqueuelen 10000;"
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done)
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else
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echo "❌ Skipping NIC tuning — not KVM with Broadcom NIC"
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fi
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'
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RemainAfterExit=yes
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[Install]
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WantedBy=multi-user.target
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EOF
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echo "=== Reloading systemd and enabling service ==="
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sudo systemctl daemon-reexec
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sudo systemctl daemon-reload
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sudo systemctl enable --now conditional-nic-offload.service
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echo "=== ✅ VM NIC conditional optimization complete ==="
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for nic in "${NIC_LIST[@]}"; do
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echo "--- $nic ---"
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ethtool -k "$nic" | grep -E 'segmentation|offload|scatter|checksum' || true
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ip link show "$nic" | grep txqueuelen || true
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done
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