Autostart

When your machine turns on or reboots, you want certain things to happen automatically. If the 'machine' is a web server hosting websites defined by Apache and also a database server running MySQL, then naturally you would want Apache and MySQL to start automatically. In SysV-style systems that still use init and the rc.d run levels, you can use either chkconfig (RedHat and derivatives) or sysv-rc-conf or update-rc.dfor Debian variants to make that permanent. The old SysV style init has now largely been replaced by systemd, so this article is just to guide you through some of the equivalents across multiple ways of doing init.

List services

So what are the services controlled by init scripts?

# the easy way (if somewhat non-specific)
ls -l /etc/rc.d/init.d/
# On Ubuntu 14.04 you'll have the 'service' command
# service --status-all runs all init scripts, in alphabetical order, with the status command. This option only calls status for sysvinit jobs
service --status-all
# upstart jobs can be queried in a similar manner with initctl list
initctl list
# on older Ubuntu like 14.04, you probably also have update-rc.d, but that doesn't have a 'list' command
# You could 'manually' search all the init scripts for the right runlevel
grep -i 'runlevel' /etc/init/*| awk '!/#/ && /start on/ && /2/ {gsub("/"," "); print $0  }' | cut -d ' ' -f4-
# or 
grep -i 'runlevel' /etc/init/* | awk '/start on/ && /2/ {gsub("/"," "); gsub(":", " ");gsub(".conf"," "); print $3  }'
# the RedHat way (using chkconfig)
chkconfig --list
# for newer systemd controlled systems
systemctl list-units

Here is an example list of the services you might find on your machine:

1. NetworkManager
2. acpid
3. anacron
4. atd
5. auditd
6. autofs
7. avahi-daemon
8. avahi-dnsconfd
9. bluetooth
10. capi
11. clvmd
12. cman
13. cmirror
14. conman
15. cpuspeed
16. crashplan
17. crond
18. cups
19. dc_client
20. dc_server
21. dnsmasq
22. dund
23. ebtables
24. firstboot
25. gfs
26. gfs2
27. gpm
28. haldaemon
29. hidd
30. hplip
31. httpd
32. ip6tables
33. ipmi
34. iptables
35. irda
36. irqbalance
37. iscsi
38. iscsid
39. isdn
40. kdump
41. kudzu
42. libvirt-guests
43. libvirtd
44. lm_sensors
45. luci
46. lvm2-monitor
47. mcstrans
48. mdmonitor
49. mdmpd
50. messagebus
51. modclusterd
52. multipathd
53. mysql51-mysqld
54. mysql55-mysqld
55. mysqld
56. nagios
57. netconsole
58. netfs
59. netplugd
60. network
61. networker
62. nfs
63. nfslock
64. nginx
65. nrpe
66. nscd
67. ntop
68. ntpd
69. nxserver
70. oddjobd
71. openais
72. openwsmand
73. pand
74. pcscd
75. piranha-gui
76. portmap
77. postfix
78. postgresql
79. psacct
80. pulse
81. qdiskd
82. rawdevices
83. rdisc
84. readahead_early
85. readahead_later
86. restorecond
87. rgmanager
88. rhnsd
89. rhsmcertd
90. ricci
91. rpcgssd
92. rpcidmapd
93. rpcsvcgssd
94. rsyslog
95. saslauthd
96. sblim-sfcb
97. scsi_reserve
98. setroubleshoot
99. slinksc
100. smartd
101. snmpd
102. snmptrapd
103. squid
104. sshd
105. svnserve
106. syslog
107. tomcat5
108. tux
109. vncserver
110. wdaemon
111. winbind
112. wpa_supplicant
113. xfs
114. xinetd
115. ypbind
116. yum-updatesd

Enable/Disable/Start/Stop/Status a service

# for older systems using System V style init
chkconfig apache on|off|start|stop|status
# for newer systemd controlled systems
systemctl enable|disable|start|stop|status <servicename>.service

More

• SysVinit to Systemd Cheatsheet