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linux关机重启六种方法(sysrq
shutdown
halt init)
当前版本
cat
/etc/debian_version
5.0.1
一、linux关机命令(前四种)
1、
shutdown
-h now(-h:halt after
shutdown
.)
halt
init 0
poweroff
2、linux重启命令(前四种)
shutdown
-r(-r:reboot after
shutdown
.)
reboot
init 6
二、特殊情况重启和关机(能
ping
通 上述命令无法使用情况下 也就是系统挂起了)
1、查看内核是否支持
cat
/boot/config-
`
uname
-r`|
grep
"CONFIG_MAGIC_SYSRQ"
CONFIG_MAGIC_SYSRQ=y
2、临时开启或关闭
echo
0 >
/proc/sys/kernel/sysrq
echo
1 >
/proc/sys/kernel/sysrq
0 - disable sysrq completely
1 -
enable
all functions of sysrq
3、通过sysctl命令永久设置
sysctl -w kernel.sysrq=1
sysctl -a|
grep
"kernel.sysrq"
kernel.sysrq = 1
4、具体命令
重启系统
echo
"b"
>
/proc/sysrq-trigger
'b'
- Will immediately reboot the system without syncing or unmounting
your disks.
关闭系统
echo
"o"
>
/proc/sysrq-trigger
'o'
- Will shut your system off (
if
configured and supported).
三、调用ipmi命令关机和重启(前提是配置过)
1、重启机器
ipmitool -Ilanplus -H 172.16.1. -U root -P 123456 power reset
2、关闭电源
ipmitool -I lanplus -H 172.16.1. -U root -P 123456 power off
一些sysrq的命令参数说明
'b'
- Will immediately reboot the system without syncing or unmounting your disks.
'c'
- Will perform a system crash by a NULL pointer dereference.A crashdump will be taken
if
configured.
'd'
- Shows all locks that are held.
'e'
- Send a SIGTERM to all processes, except
for
init.
'f'
- Will call oom_kill to
kill
a memory hog process.
'g'
- Used by kgdb (kernel debugger)
'h'
- Will display help (actually any other key than those listed here will display help. but
'h'
is easy to remember :-)
'i'
- Send a SIGKILL to all processes, except
for
init.
'j'
- Forcibly
"Just thaw it"
- filesystems frozen by the FIFREEZE ioctl.
'k'
- Secure Access Key (SAK) Kills all programs on the current virtual console. NOTE: See important comments below
in
SAK section.
'l'
- Shows a stack backtrace
for
all active CPUs.
'm'
- Will dump current memory info to your console.
'n'
- Used to
make
RT tasks
nice
-able
'o'
- Will shut your system off (
if
configured and supported).
'p'
- Will dump the current registers and flags to your console.
'q'
- Will dump per CPU lists of all armed hrtimers (but NOT regular timer_list timers) and detailed information about all clockevent devices.
'r'
- Turns off keyboard raw mode and sets it to XLATE.
's'
- Will attempt to
sync
all mounted filesystems.
't'
- Will dump a list of current tasks and their information to your console.
'u'
- Will attempt to remount all mounted filesystems
read
-only.
'v'
- Forcefully restores framebuffer console
'v'
- Causes ETM buffer dump [ARM-specific]
'w'
- Dumps tasks that are
in
uninterruptable (blocked) state.
'x'
- Used by xmon interface on ppc
/powerpc
platforms. Show global PMU Registers on sparc64.
'y'
- Show global CPU Registers [SPARC-64 specific]
'z'
- Dump the ftrace buffer
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本文转自 xdoujiang 51CTO博客，原文链接：http://blog.51cto.com/7938217/1643948，如需转载请自行联系原作者
