Improve the systemd startup files.

etc/slurmctld.service.in

@@ -5,7 +5,9 @@ ConditionPathExists=@sysconfdir@/slurm.conf
 
 [Service]
 Type=forking
-ExecStart=@sbindir@/slurmctld
+EnvironmentFile=-/etc/sysconfig/slurmctld
+ExecStart=@sbindir@/slurmctld $SLURMCTLD_OPTIONS
+ExecReload=/bin/kill -HUP $MAINPID
 PIDFile=/var/run/slurmctld.pid
 
 [Install]

etc/slurmd.service.in

@@ -5,9 +5,14 @@ ConditionPathExists=@sysconfdir@/slurm.conf
 
 [Service]
 Type=forking
-ExecStart=@sbindir@/slurmd
+EnvironmentFile=-/etc/sysconfig/slurmd
+ExecStart=@sbindir@/slurmd $SLURMD_OPTIONS
+ExecReload=/bin/kill -HUP $MAINPID
 PIDFile=/var/run/slurmd.pid
 KillMode=process
+LimitNOFILE=51200
+LimitMEMLOCK=infinity
+LimitSTACK=infinity
 
 [Install]
 WantedBy=multi-user.target

etc/slurmdbd.service.in

@@ -5,7 +5,9 @@ ConditionPathExists=@sysconfdir@/slurmdbd.conf
 
 [Service]
 Type=forking
-ExecStart=@sbindir@/slurmdbd
+EnvironmentFile=-/etc/sysconfig/slurmdbd
+ExecStart=@sbindir@/slurmdbd $SLURMDBD_OPTIONS
+ExecReload=/bin/kill -HUP $MAINPID
 PIDFile=/var/run/slurmdbd.pid
 
 [Install]