1. add (postgresql-service) to the service list
2. reconfigure
3. ps -ef | grep postgres
--8<---------------cut here---------------start------------->8---
postgres 19058 1 0 16:21 ? 00:00:00
/gnu/store/0v539yjmdqhjm1xcpvndmagkgjz5fvh2-guile-2.2.2/bin/guile
--no-auto-compile /gnu/store/rp6qyfv5wyznz5a1i6szzzy997v603sl-start-postgres
postgres 19061 19058 0 16:21 ? 00:00:00
/gnu/store/3rg0avphlwgq56qjxd8gr8xbmh1rwkal-postgresql-10.1/bin/postgres
--config-file=/gnu/store/7m8yrv4avricqkn92737b5mamlvaid34-postgresql.conf -p
5432 -D /var/lib/postgresql/data
postgres 19063 19061 0 16:21 ? 00:00:00 postgres: checkpointer process
postgres 19064 19061 0 16:21 ? 00:00:00 postgres: writer process
postgres 19065 19061 0 16:21 ? 00:00:00 postgres: wal writer process
postgres 19066 19061 0 16:21 ? 00:00:00 postgres: autovacuum launcher
process
postgres 19067 19061 0 16:21 ? 00:00:00 postgres: stats collector
process
postgres 19068 19061 0 16:21 ? 00:00:00 postgres: bgworker: logical
replication launcher
clement 19070 18802 0 16:21 pts/4 00:00:00 grep postgres
--8<---------------cut here---------------end--------------->8---
4. herd stop postgres (output: Service postgres has been stopped)
5. ps -ef | grep postgres
--8<---------------cut here---------------start------------->8---
postgres 19061 1 0 16:21 ? 00:00:00
/gnu/store/3rg0avphlwgq56qjxd8gr8xbmh1rwkal-postgresql-10.1/bin/postgres
--config-file=/gnu/store/7m8yrv4avricqkn92737b5mamlvaid34-postgresql.conf -p
5432 -D /var/lib/postgresql/data
postgres 19063 19061 0 16:21 ? 00:00:00 postgres: checkpointer process
postgres 19064 19061 0 16:21 ? 00:00:00 postgres: writer process
postgres 19065 19061 0 16:21 ? 00:00:00 postgres: wal writer process
postgres 19066 19061 0 16:21 ? 00:00:00 postgres: autovacuum launcher
process
postgres 19067 19061 0 16:21 ? 00:00:00 postgres: stats collector
process
postgres 19068 19061 0 16:21 ? 00:00:00 postgres: bgworker: logical
replication launcher
clement 19078 18802 0 16:21 pts/4 00:00:00 grep postgres
--8<---------------cut here---------------end--------------->8---
