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danthegoodman1/aws-timesync-ptp.sh

Last active July 4, 2025 18:36
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Setup AWS Timesync with the PTP clock for Ubuntu (x86 and arm tested)
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aws-timesync-ptp.sh
#!/usr/bin/env bash
set -euo pipefail
echo "[1/6] Install build deps…"
sudo apt-get update -qq
sudo apt-get install -y --no-install-recommends \
build-essential git linux-headers-$(uname -r)
echo "[2/6] Fetch & compile ENA with PHC…"
workdir=$(mktemp -d)
git -C "$workdir" clone --depth 1 https://github.com/amzn/amzn-drivers.git
cd "$workdir"/amzn-drivers/kernel/linux/ena
ENA_PHC_INCLUDE=1 make -j"$(nproc)" # pulls in PHC support
echo "[3/6] Install the new module…"
sudo mkdir -p /lib/modules/$(uname -r)/updates
sudo cp -f ena.ko /lib/modules/$(uname -r)/updates/
sudo depmod -a
echo "[4/6] Enable PHC on load…"
echo "options ena phc_enable=1" | sudo tee /etc/modprobe.d/ena-phc.conf
echo "[5/6] Re-generate initramfs…"
sudo update-initramfs -u -k $(uname -r)
echo "[6/6] Done – rebooting to activate PHC-enabled ENA."
sleep 5
sudo reboot
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danthegoodman1 commented Jul 3, 2025

clockbound should automatically use the ptp clock once you tell chronyd to use the PHC (ptp hardware clock)

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