69 lines
1.8 KiB
Bash
Executable File
69 lines
1.8 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
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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 network interfaces ==="
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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: ${NIC_LIST[*]}"
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echo "=== [5/5] Creating persistent systemd service to disable offloads ==="
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SERVICE_FILE="/etc/systemd/system/disable-vm-nic-offloads.service"
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DISABLE_CMDS=""
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for nic in "${NIC_LIST[@]}"; do
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DISABLE_CMDS+="/usr/sbin/ethtool -K $nic tx off rx off tso off gso off gro off; "
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DISABLE_CMDS+="/sbin/ip link set $nic txqueuelen 10000; "
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done
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# Escape for ExecStart
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DISABLE_CMDS_ESCAPED=$(printf '%q ' "$DISABLE_CMDS")
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sudo tee "$SERVICE_FILE" > /dev/null <<EOF
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[Unit]
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Description=Disable all VM NIC offloads at boot
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After=network.target
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[Service]
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Type=oneshot
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ExecStart=/bin/bash -c "$DISABLE_CMDS_ESCAPED"
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RemainAfterExit=yes
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[Install]
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WantedBy=multi-user.target
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EOF
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echo "=== Enabling and starting NIC offload disable service ==="
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sudo systemctl daemon-reexec
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sudo systemctl daemon-reload
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sudo systemctl enable --now disable-vm-nic-offloads.service
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echo "=== ✅ VM NIC setup complete ==="
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for nic in "${NIC_LIST[@]}"; do
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echo "--- $nic ---"
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ethtool -k "$nic" | grep -E 'segmentation|offload|scatter|checksum'
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ip link show "$nic" | grep txqueuelen
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done
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