gentoo-overlay/dev-db/etcd/files/etcd.service

[Unit]
Description=Etcd Server
After=network.target

[Service]
Type=notify
PermissionsStartOnly=true
Environment=ETCD_DATA_DIR=/var/lib/etcd
Environment=ETCD_NAME=%m
WorkingDirectory=/var/lib/etcd/
User=etcd
ExecStart=/usr/bin/etcd
Restart=on-failure
LimitNOFILE=65536

[Install]
WantedBy=default.target