[Unit]
Description=the Mongo Daemon, '%i' instance
After=syslog.target network.target

[Service]
Type=simple
EnvironmentFile=-/etc/sysconfig/mongod
ExecStartPre=/bin/sh -c "if grep -q '^[ \t]*fork\>' /etc/mongod/%i.conf ; then echo there must be no 'fork' in /etc/mongod/%i.conf >&2 ; exit 1 ; fi"
ExecStart=/usr/bin/mongod --config /etc/mongod/%i.conf
User=mongod
Group=mongod

[Install]
Alias=multi-user.target.wants/mongod@default.service