systemd/nfs-idmapd.service

[Unit]
Description=NFSv4 ID-name mapping service
DefaultDependencies=no
Requires=rpc_pipefs.target
After=rpc_pipefs.target local-fs.target

BindsTo=nfs-server.service

[Service]
Type=forking
ExecStart=/usr/sbin/rpc.idmapd