[root@centos7g4 ~]# cat /usr/lib/systemd/system/pg_receivewal_data.service
[Unit]
Description=pg_receivewal archiver for instance data
After=network.target
StartLimitIntervalSec=0

[Service]

User=postgres
Group=postgres

Environment=PGPASSWORD=postgres
PIDFile=/var/run/pg_receivewal.data.pid
Restart=always
RestartSec=10
TimeoutStartSec=10
ExecStartPre=/bin/mkdir -vp /mnt/nfs/probackup/wal/data
ExecStartPre=/usr/pgsql-11/bin/pg_receivewal -h 10.0.2.7 -U postgres --if-not-exists --create-slot -S wal_archive -v
#ExecStart=/usr/pgsql-11/bin/pg_receivewal -h 10.0.2.7 -U postgres -S wal_archive -v --compress=6 -D /mnt/nfs/probackup/wal/data
ExecStart=/usr/pgsql-11/bin/pg_receivewal -h 10.0.2.7 -U postgres -S wal_archive -v -D /mnt/nfs/probackup/wal/data

[Install]
WantedBy=multi-user.target