Difference between revisions of "SysV, SystemD and UpStArt"
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SysV is a framework for [[scheduling tasks]] to start at boot time. It is beeing successed by systemd and upstart. This affects how services are started and stopped. With systemd you start a service like | SysV is a framework for [[scheduling tasks]] to start at boot time. It is beeing successed by systemd and upstart. This affects how services are started and stopped. With systemd you start a service like | ||
/etc/init.d/[[ntp]] start | /etc/init.d/[[ntp]] start | ||
| Line 13: | Line 12: | ||
|- | |- | ||
| find out if service ''foo'' is running || /etc/init.d/''foo'' status || systemctl status ''foo'' | | find out if service ''foo'' is running || /etc/init.d/''foo'' status || systemctl status ''foo'' | ||
| + | |- | ||
| + | | schedule service ''foo'' to start on boot || chkconfig ''foo'' on || chkconfig ''foo'' on | ||
| + | |- | ||
| + | | change "runlevel" to multi-user || init 2 || systemctl isolate multi-user.target | ||
|} | |} | ||
| + | |||
| + | = SystemD = | ||
| + | SystemD cannot only manage services, but also targets. Targets are sets of services. They differ from runlevels in that multiple of them can be active: | ||
| + | <pre> | ||
| + | # systemctl list-units --type target | cat | ||
| + | UNIT LOAD ACTIVE SUB JOB DESCRIPTION | ||
| + | basic.target loaded active active Basic System | ||
| + | cryptsetup.target loaded active active Encrypted Volumes | ||
| + | getty.target loaded active active Login Prompts | ||
| + | </pre> | ||
Latest revision as of 08:40, 21 January 2016
SysV is a framework for scheduling tasks to start at boot time. It is beeing successed by systemd and upstart. This affects how services are started and stopped. With systemd you start a service like
/etc/init.d/ntp start
With SystemD you do it with
systemctl start ntp
| what you want to do | how you do it with SysV | how you do it with SystemD |
|---|---|---|
| start service foo | /etc/init.d/foo start | systemctl start foo |
| stop service foo | /etc/init.d/foo stop | systemctl stop foo |
| find out if service foo is running | /etc/init.d/foo status | systemctl status foo |
| schedule service foo to start on boot | chkconfig foo on | chkconfig foo on |
| change "runlevel" to multi-user | init 2 | systemctl isolate multi-user.target |
SystemD
SystemD cannot only manage services, but also targets. Targets are sets of services. They differ from runlevels in that multiple of them can be active:
# systemctl list-units --type target | cat UNIT LOAD ACTIVE SUB JOB DESCRIPTION basic.target loaded active active Basic System cryptsetup.target loaded active active Encrypted Volumes getty.target loaded active active Login Prompts
