![Sumar al optiunilor:
,
scrat:~# kexec -h
Usage: kexec [OPTION]... [kernel]
Directly reboot into a new kernel
-h, --help Print this help.
-v, --version Print the version of kexec.
-f, --force Force an immediate kexec,
dont call shutdown.
-l, --load Load the new kernel into the
current kernel.
-p, --load-panic Load the new kernel for use on panic.
-u, --unload Unload the current kexec target kernel.
-e, --exec Execute a currently loaded kernel.
1-1](https://image.slidesharecdn.com/kexec-091211024737-phpapp02/85/kexec-lightning-talk-3-320.jpg)
kexec (lightning talk)
- 1. kexec/kdump: reboot rapid si , debug postmortem Matei Conovici mconovici@gmail.com RLUG Meeting, Decembrie 2009
- 2. kexec apel sistem pentru arcarea memorie si lansarea executie 脹nc 脹n , 脹n , a unui nou kernel, fr a restarta sistemul modul traditional a a 脹n , utilitar pentru controlul acestei facilitti a, # kexec -l /vmlinuz --initrd=/initrd.img --reuse-cmdline # kexec -e kexec/kdump: reboot rapid si debug postmortem Matei Conovici , 1 RLUG Meeting, Decembrie 2009
- 3. Sumar al optiunilor: , scrat:~# kexec -h Usage: kexec [OPTION]... [kernel] Directly reboot into a new kernel -h, --help Print this help. -v, --version Print the version of kexec. -f, --force Force an immediate kexec, dont call shutdown. -l, --load Load the new kernel into the current kernel. -p, --load-panic Load the new kernel for use on panic. -u, --unload Unload the current kexec target kernel. -e, --exec Execute a currently loaded kernel. 1-1
- 4. Supported kernel file types and options: elf-x86 --append=STRING Set the kernel command line to STRING --reuse-cmdline Use kernel command line from running system. --initrd=FILE Use FILE as the kernels initial ramdisk. --args-linux Pass linux kernel style options --args-elf Pass elf boot notes Architecture options: --serial=<port> Specify the serial port for debug output --serial-baud=<baud_rate> Specify the serial port baud rate --console-vga Enable the vga console --console-serial Enable the serial console 1-2
- 5. Utilizare Debian GNU/Linux, pachetul kexec-tools instaleaz scrip- In a turile de init necesare pentru reboot /etc/default/kexec se alege dac la reboot se foloseste kexec In a , # Load a kexec kernel (true/false) LOAD KEXEC=true kexec/kdump: reboot rapid si debug postmortem Matei Conovici , 2 RLUG Meeting, Decembrie 2009
- 6. Pro/Con Se evit timpii morti la boot, mai ales cu unele BIOS-uri a , enervante Nu toate driverele pot s aduc dispozitivele a a 脹ntr-o stare su鍖- cient de consistent pentru a porni la cald a kexec/kdump: reboot rapid si debug postmortem Matei Conovici , 3 RLUG Meeting, Decembrie 2009
- 7. kdump cazul unei erori fatale kernel, loc de halt sau reboot In 脹n 脹n acesta poate apela kexec pentru a lansa un nou kernel Noul kernel ruleaz a 脹ntr-un spatiu de memorie rezervat in pre- , alabil Dup pornire se poate investiga continutul memoriei RAM a a , kernelului anterior kexec/kdump: reboot rapid si debug postmortem Matei Conovici , 4 RLUG Meeting, Decembrie 2009
- 8. kdump Kernel-ul standard trebuie s rezerve spatiu pentru dump- a , capture kernel append="... crashkernel=64M@16M ..." Se 脹ncarc memorie kernelul dump-capture a 脹n # kexec -p /vmlinuz --initrd=/initrd.img --reuse-cmdline Se asteapt urmtorul PANIC :-) , a a Continutul memoriei RAM este expus /proc/vmcore sau , 脹n /dev/oldmem kexec/kdump: reboot rapid si debug postmortem Matei Conovici , 5 RLUG Meeting, Decembrie 2009
- 9. kdump Cteva optiuni necesare con鍖guratia kernel-ului: a , 脹n , CONFIG KEXEC, CONFIG CRASH DUMP, CONFIG PROC VMCORE ... Vezi /usr/src/linux/Documentation/kdump/kdump.txt kexec/kdump: reboot rapid si debug postmortem Matei Conovici , 6 RLUG Meeting, Decembrie 2009