# Example systemd unit — SECOND XDC-Relayer (Chain 138 <-> XDC parent/mainnet).
# Do not disable your existing subnet<->parent relayer.
#
# Prerequisites: Redis (upstream), built relayer (`npm run build`), env file with SUBNET_URL, PARENTNET_URL, etc.
#
# Install:
#   sudo cp config/systemd/xdc-zero-relayer-138-pair.example.service /etc/systemd/system/xdc-zero-relayer-138-pair.service
#   sudo cp config/xdc-zero/xdc-zero-relayer-138-pair.example.defaults /etc/default/xdc-zero-relayer-138-pair
#   sudo chmod 640 /etc/default/xdc-zero-relayer-138-pair
#   # Edit WorkingDirectory to your clone (e.g. /home/op/XDC-Relayer) and fill /etc/default/...
#   # If you run the relayer manually from the repo root instead of systemd, use
#   # config/xdc-zero/xdc-relayer.dotenv.example as the source for the clone-local .env.
#   sudo systemctl daemon-reload && sudo systemctl enable --now xdc-zero-relayer-138-pair
#
# ExecStart matches upstream: `npm run start` -> `node dist/server.js` (Node 20.x per package.json engines).

[Unit]
Description=XDC Relayer — Chain 138 to XDC mainnet (second instance)
After=network-online.target
Wants=network-online.target

[Service]
Type=simple
User=root
WorkingDirectory=/opt/xdc-relayer
EnvironmentFile=-/etc/default/xdc-zero-relayer-138-pair
# Relayer reads process.env; dotenv does not override vars systemd already set.
ExecStart=/usr/bin/node dist/server.js
Restart=on-failure
RestartSec=30

[Install]
WantedBy=multi-user.target