Redhat - fedora service startup

run levels

Service start and stop scrips are associated with run levels 0-6. Each has a corresponding directory in /etc/rc.d. For each run level, a script beginning with K stops the service, whereas a script beginning with S starts the service.

starting services on boot

In order to start it automatically on every system boot, run

# systemctl enable sshd.service

Likewise, you can remove it from system startup

# systemctl disable sshd.service

If you would like to see a list of all available managed services, run

# systemctl -a

chkconfig method

listing existing services

listing existing services and the run level start configurations

# chkconfig --list

example:

# chkconfig --list | grep sshd
sshd            0:off   1:off   2:on    3:on    4:on    5:on    6:off

corresponding start/stop scripts

# grep -r -m 1 sshd /etc/rc.d/*  | sort -n
/etc/rc.d/init.d/sshd:# processname: sshd
/etc/rc.d/rc0.d/K25sshd:# processname: sshd
/etc/rc.d/rc1.d/K25sshd:# processname: sshd
/etc/rc.d/rc2.d/S55sshd:# processname: sshd
/etc/rc.d/rc3.d/S55sshd:# processname: sshd
/etc/rc.d/rc4.d/S55sshd:# processname: sshd
/etc/rc.d/rc5.d/S55sshd:# processname: sshd
/etc/rc.d/rc6.d/K25sshd:# processname: sshd

=adding new services

adding a new service if isn't already listed.

# chkconfig --add <name>

name = service name as its start script appears in /etc/init.d/ or you will get an error

example

# chkconfig --add poopd
error reading information on service badserviced: Invalid argument

example...

# chkconfig --add snmpd

check service just added, notice all run levels will be off by default

# chkconfig --list | grep nrpe
nrpe            0:off   1:off   2:off   3:off   4:off   5:off   6:off

setting the run levels

# chkconfig --level <levels> <name> on

example, setting levels 2-5...

# chkconfig --level 2345 snmpd on

misc info

# chkconfig sshd on 

on fedora 17, the above command creates a symlink in a subdir of /etc/systemd/system/