来一发CentOS启动级别:init 0,1,2,3,4,5,6

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0:停机
1：单用户情势，只root举行保护
2：多用户，不克不及利用netfilesystem
3：完整多用户
5：图形化
4：宁静形式
6：重启

实在，能够经由过程检察/etc/rc.d/中的rc*.d的文件来对照了解。。
init0，对应的体系会运转，/etc/rc.d/rc0.d里指定的步伐。我们来看下称号。
[root@localhost～]#ls/etc/rc.d/rc0.d
K01dnsmasqK15ksmtunedK35nmbK60crondK74lm_sensorsK83portreserveK85rpcgssdK88iscsiK90networkS00killall
K10cupsK16ksmK35smbK66gpsdK75netfsK84NetworkManagerK85rpcidmapdK88rsyslogK92ip6tablesS01halt
K10saslauthdK20nfsK36mysqldK69rpcsvcgssdK75udev-postK84wpa_supplicantK86nfslockK89iscsidK92iptables
K10xfsK25sshdK50haldaemonK70vboxdrvK76openvpnK85mdmonitorK87alsasoundK89netplugdK98qemu
K15gpmK30sendmailK50netconsoleK74acpidK83bluetoothK85messagebusK87rpcbindK89rdiscK99lvm2-monitor
按照上述白色字体，开时机实行的两个历程是killall和halt，这两个都暗示为停止历程。故init0是用于暗示关机的。

init1，对应的体系会运转，/etc/rc.d/rc1.d里指定的步伐。
[root@localhost～]#ls/etc/rc.d/rc1.d
K01dnsmasqK15ksmtunedK35nmbK60crondK74lm_sensorsK84NetworkManagerK85rpcidmapdK88rsyslogK92ip6tablesS99single
K10cupsK16ksmK35smbK66gpsdK75netfsK84wpa_supplicantK86nfslockK89iscsidK92iptables
K10saslauthdK20nfsK36mysqldK69rpcsvcgssdK76openvpnK85mdmonitorK87alsasoundK89netplugdK98qemu
K10xfsK25sshdK50haldaemonK70vboxdrvK83bluetoothK85messagebusK87rpcbindK89rdiscS02lvm2-monitor
K15gpmK30sendmailK50netconsoleK74acpidK83portreserveK85rpcgssdK88iscsiK90networkS26udev-post
这个级别启动的办事有三个，udev、lvm相干的和single(单用户形式的办事)。故此级别是单用户形式，只要root能用，不撑持其他用户。

init2，对应的体系会运转，/etc/rc.d/rc2.d里指定的步伐。
[root@localhost~]#ls/etc/rc.d/rc2.d/
K01dnsmasqK20nfsK36mysqldK74lm_sensorsK85rpcgssdK89netplugdS08iptablesS23NetworkManagerS30vboxdrvS99local
K10saslauthdK25sshdK50haldaemonK75netfsK85rpcidmapdK89rdiscS12rsyslogS24portreserveS35qemu
K10xfsK30sendmailK50netconsoleK76openvpnK86nfslockK90networkS13rpcbindS25cupsS85gpm
K15ksmtunedK35nmbK66gpsdK83bluetoothK88iscsiS02lvm2-monitorS15mdmonitorS26acpidS90crond
K16ksmK35smbK69rpcsvcgssdK84wpa_supplicantK89iscsidS08ip6tablesS22messagebusS26udev-postS99alsasound
这个级别启动的办事多了，NetworkManager/iptables/acpid/alsa都已开启，可是nfs,smb,openvpn相干办事没有开启，这个级别不撑持nfs。

init3，对应的体系运转/etc/rc.d/rc3.d
[root@localhost~]#ls/etc/rc.d/rc3.d/
K01dnsmasqK30sendmailK74lm_sensorsK89rdiscS08iptablesS18rpcidmapdS25cupsS35qemuS85ksmtunedS99local
K10saslauthdK36mysqldK76openvpnK90networkS12rsyslogS19rpcgssdS25netfsS50bluetoothS90crond
K10xfsK50netconsoleK84wpa_supplicantK99lvm2-monitorS13iscsiS22messagebusS26acpidS50haldaemonS91nmb
K20nfsK66gpsdK85mdmonitorS07iscsidS13rpcbindS23NetworkManagerS26udev-postS84ksmS91smb
K25sshdK69rpcsvcgssdK89netplugdS08ip6tablesS14nfslockS24portreserveS30vboxdrvS85gpmS99alsasound
这个级别nfs办事是开启的，被成为完整多用户形式。

init4
[root@localhost~]#ls/etc/rc.d/rc4.d/
K01dnsmasqK30sendmailK66gpsdK85mdmonitorS07iscsidS13rpcbindS23NetworkManagerS26udev-postS84ksmS99local
K10saslauthdK35nmbK69rpcsvcgssdK89netplugdS08ip6tablesS14nfslockS24portreserveS30vboxdrvS85gpm
K10xfsK35smbK74lm_sensorsK89rdiscS08iptablesS18rpcidmapdS25cupsS35qemuS85ksmtuned
K20nfsK36mysqldK76openvpnK90networkS12rsyslogS19rpcgssdS25netfsS50bluetoothS90crond
K25sshdK50netconsoleK84wpa_supplicantK99lvm2-monitorS13iscsiS22messagebusS26acpidS50haldaemonS99alsasound
此形式被称为宁静形式。

init5
[root@localhost~]#ls/etc/rc.d/rc5.d/
K01dnsmasqK25sshdK66gpsdK84wpa_supplicantK87rpcbindK90networkS22messagebusS26udev-postS84ksmS99local
K10saslauthdK30sendmailK69rpcsvcgssdK85mdmonitorK88iscsiK99lvm2-monitorS23NetworkManagerS30vboxdrvS85ksmtuned
K10xfsK36mysqldK74lm_sensorsK85rpcgssdK89iscsidS08ip6tablesS25cupsS35qemuS91nmb
K15gpmK50netconsoleK76openvpnK85rpcidmapdK89netplugdS08iptablesS25netfsS50bluetoothS91smb
K20nfsK60crondK83portreserveK86nfslockK89rdiscS12rsyslogS26acpidS50haldaemonS99alsasound
完全的图形形式

init6
[root@localhost~]#ls/etc/rc.d/rc6.d/
K01dnsmasqK15ksmtunedK35nmbK60crondK74lm_sensorsK83portreserveK85rpcgssdK88iscsiK90networkS00killall
K10cupsK16ksmK35smbK66gpsdK75netfsK84NetworkManagerK85rpcidmapdK88rsyslogK92ip6tablesS01reboot
K10saslauthdK20nfsK36mysqldK69rpcsvcgssdK75udev-postK84wpa_supplicantK86nfslockK89iscsidK92iptables
K10xfsK25sshdK50haldaemonK70vboxdrvK76openvpnK85mdmonitorK87alsasoundK89netplugdK98qemu
K15gpmK30sendmailK50netconsoleK74acpidK83bluetoothK85messagebusK87rpcbindK89rdiscK99lvm2-monitor
这个级别里，只要两个办事，一个为killall，一个是reboot，即，封闭如今的体系，重启。故此级别是重启。

分歧的体系版本，大概内里的文件会分歧，假如要检察，能够经由过程ll来看，实在他们都是软毗连。
如果您觉得本篇CentOSLinux教程讲得好，请记得点击右边漂浮的分享程序，把好文章分享给你的好朋友们！