标签：sysrq shutdown halt init ipmi
linux关机重启五种方法(sysrq shutdown halt init) 当前版本 cat /etc/debian_version 5.0.1 一、linux关机命令(前三种) 1、shutdown -h now(-h:halt after shutdown.) halt init 0 2、linux重启命令 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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linux关机重启五种方法(sysrq shutdown halt init ipmi)
标签：sysrq shutdown halt init ipmi
原文地址：http://7938217.blog.51cto.com/7928217/1643948
