sysown/proxysql#2796: Fix systemctl start proxysql-initial and associated documentation in the proxysql.cnf file (#2797)

etc/proxysql.cnf

@@ -27,7 +27,7 @@
 #            file is only used to initial the on-disk database read on the first startup.
 #
 # In order to FORCE a re-initialise of the on-disk database from the configuration file 
-# the ProxySQL service should be started with "service proxysql initial".
+# the ProxySQL service should be started with "systemctl start proxysql-initial".
 #
 ########################################################################################
 

systemd/system/proxysql.service

@@ -8,7 +8,7 @@ RuntimeDirectory=proxysql
 #PermissionsStartOnly=true
 #ExecStartPre=/usr/bin/mkdir -p /var/run/proxysql /var/run/proxysql
 #ExecStartPre=/usr/bin/chown -R proxysql: /var/run/proxysql/
-ExecStart=/usr/bin/proxysql --idle-threads -c /etc/proxysql.cnf
+ExecStart=/usr/bin/proxysql --idle-threads -c /etc/proxysql.cnf $PROXYSQL_OPTS
 PIDFile=/var/lib/proxysql/proxysql.pid
 #StandardError=null  # all output is in stderr
 SyslogIdentifier=proxysql